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JP4194212B2 - Hot water storage hot water source - Google Patents
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JP4194212B2 - Hot water storage hot water source - Google Patents

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JP4194212B2
JP4194212B2 JP2000110166A JP2000110166A JP4194212B2 JP 4194212 B2 JP4194212 B2 JP 4194212B2 JP 2000110166 A JP2000110166 A JP 2000110166A JP 2000110166 A JP2000110166 A JP 2000110166A JP 4194212 B2 JP4194212 B2 JP 4194212B2
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hot water
water storage
target
circulation
temperature
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JP2001296059A (en
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徹 福知
寿成 酒井
康人 橋詰
敏弘 河内
泰 藤川
善夫 藤本
謙治 談議所
智也 崎石
健一 田之頭
和也 山口
直司 肆矢
実希夫 伊藤
道憲 川原
勝雪 名倉
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Saibu Gas Co Ltd
Osaka Gas Co Ltd
Tokyo Gas Co Ltd
Toho Gas Co Ltd
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Saibu Gas Co Ltd
Osaka Gas Co Ltd
Tokyo Gas Co Ltd
Toho Gas Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、給湯路が上部に接続された貯湯タンクと、前記貯湯タンク内に湯水が温度成層を形成して貯湯されるように、前記貯湯タンクの底部から取り出した湯水を加熱手段にて加熱したのち、その温水を前記貯湯タンクの上部に供給する形態の貯湯運転用循環状態で湯水を循環させる湯水循環手段と、前記貯湯運転用循環状態で循環させた湯水が目標貯湯状態で前記貯湯タンクに貯湯されるように前記湯水循環手段の運転を制御する循環制御手段とが設けられた貯湯式の給湯熱源装置に関する。
【０００２】
【従来の技術】
上記貯湯式の給湯熱源装置では、従来、例えば特開昭５９−７８４３号公報に記載されているように、加熱手段としてのガスバーナで加熱される熱交換器を設けて、貯湯タンクの底部から取り出した湯水をその熱交換器にて加熱したのち、その温水を貯湯タンクの上部に供給する形態で湯水を循環させて、湯水を目標貯湯状態で温度成層を形成して貯湯するように構成している。
【０００３】
【発明が解決しようとする課題】
上記従来の貯湯式の給湯熱源装置は、貯湯用の熱源として燃料ガスを燃焼させるガスバーナを使用するため、所望の目標貯湯状態で確実に貯湯できる利点があるが、貯湯コストが高くつく問題がある。
この問題を解決する手段として、例えば発電装置などを駆動するエンジンやヒートポンプの圧縮機を駆動するエンジンなどの他装置駆動機の排熱を回収して、その排熱で湯水を加熱する排熱利用式加熱器と、他装置駆動機の排熱を利用しないで湯水を加熱する排熱非利用式加熱器とを併設してある加熱手段を設けて、貯湯コストを安くすることが考えられる。
しかしながら、排熱利用式加熱器にて湯水を加熱するとしても、目標貯湯状態で貯湯したあとは、排熱があってもその排熱を有効に利用できない欠点がある。
本発明は上記実情に鑑みてなされたものであって、所望の目標貯湯状態で確実に貯湯できるようにしながら、他装置駆動機の排熱が有るときは、その排熱を有効に利用して、安い貯湯コストで貯湯できるようにすることを目的とする。
【課題を解決するための手段】
請求項１記載の発明の特徴構成は、給湯路が上部に接続された貯湯タンクと、前記貯湯タンク内に湯水が温度成層を形成して貯湯されるように、前記貯湯タンクの底部から取り出した湯水を加熱手段にて加熱したのち、その温水を前記貯湯タンクの上部に供給する形態の貯湯運転用循環状態で湯水を循環させる湯水循環手段と、
貯湯要求が指令されると、前記貯湯運転用循環状態で循環させた湯水が設定された目標貯湯状態で前記貯湯タンクに貯湯されるように前記湯水循環手段の運転を制御する貯湯運転を実行する循環制御手段とが設けられた貯湯式の給湯熱源装置であって、
前記加熱手段が、他装置駆動機の排熱を利用して湯水を加熱する排熱利用式加熱器と、前記他装置駆動機の排熱を利用しないで湯水を加熱する排熱非利用式加熱器とを設けて構成され、前記循環制御手段が、前記貯湯タンクに前記目標貯湯状態で湯水が貯湯されている状態で前記他装置駆動機の排熱が有ると判定したときは、前記排熱利用式加熱器にて湯水を加熱する貯湯運転用循環状態で湯水を循環させて、前記目標貯湯状態を越える貯湯状態で前記貯湯タンクに貯湯する排熱利用貯湯運転制御を実行するように構成され、
前記循環制御手段が、前記目標貯湯状態としての目標貯湯量の湯水が前記貯湯タンクに貯湯されるように前記湯水循環手段の運転を制御するように構成され、
前記循環制御手段が、前記目標貯湯量の湯水が前記貯湯タンクに貯湯されている状態で前記他装置駆動機の排熱が有ると判定したときは、前記目標貯湯量の設定を無効にして、最大貯湯量の湯水が前記貯湯タンクに貯湯されるように制御する排熱利用貯湯運転制御を実行し、かつ、前記他装置駆動機の排熱が無いと判定したとき、又は、前記最大貯湯量の湯水が貯湯されているときは、前記目標貯湯量の設定を元に戻すように構成されている点にある。
〔作用〕
加熱手段が、他装置駆動機の排熱を利用して湯水を加熱する排熱利用式加熱器と、他装置駆動機の排熱を利用しないで湯水を加熱する排熱非利用式加熱器とを設けて構成され、循環制御手段が、貯湯タンクの底部から取り出した湯水を排熱利用式加熱器や排熱非利用式加熱器にて加熱したのち、その温水を貯湯タンクの上部に供給する形態の貯湯運転用循環状態で循環させた湯水が目標貯湯状態で貯湯タンクに貯湯されるように、湯水循環手段の運転を制御するので、所望の目標貯湯状態で確実に貯湯できるようにしながら、貯湯コストを安くすることができる。
その上、循環制御手段は、貯湯タンクに目標貯湯状態で湯水が貯湯されている状態で他装置駆動機の排熱が有ると判定したときは、排熱利用式加熱器にて湯水を加熱する貯湯運転用循環状態で湯水を循環させて、目標貯湯状態を越える貯湯状態で貯湯タンクに貯湯する排熱利用貯湯運転制御を実行するので、目標貯湯状態で貯湯したあとでも、排熱が有るとその排熱を有効に利用して、貯湯コストの安い湯水を貯湯できる。
又、循環制御手段は、目標貯湯量の湯水が貯湯タンクに貯湯されている状態で他装置駆動機の排熱が有ると判定したときは、目標貯湯量の設定を無効にして、排熱利用式加熱器にて湯水を加熱する貯湯運転用循環状態で湯水を循環させて、最大貯湯量の湯水が貯湯タンクに貯湯されるように制御する排熱利用貯湯運転制御を実行する。
〔効果〕
所望の目標貯湯状態で確実に貯湯できるようにしながら、他装置駆動機の排熱が有るときはその排熱を有効に利用して、安い貯湯コストで貯湯できる。
又、目標貯湯量が最大貯湯量よりも少ない場合でも、排熱が有るときは貯湯タンクの貯湯容量を最大限利用して、貯湯コストの安い湯水を貯湯できる。
【０００５】
請求項２記載の発明の特徴構成は、前記循環制御手段が、前記目標貯湯状態としての目標温度の湯水が設定貯湯量で前記貯湯タンクに貯湯されるように前記湯水循環手段の運転を制御するように構成され、前記循環制御手段が、前記目標温度の湯水が前記目標貯湯量で前記貯湯タンクに貯湯されている状態で前記他装置駆動機の排熱が有ると判定したときは、前記目標温度の設定と前記目標貯湯量の設定とを無効にして、前記目標温度を越える温度の湯水が前記目標貯湯量を越える貯湯量で前記貯湯タンクに貯湯されるように制御する排熱利用貯湯運転制御を実行するように構成されている点にある。
〔作用〕
循環制御手段は、目標温度の湯水が目標貯湯量で貯湯タンクに貯湯されている状態で他装置駆動機の排熱が有ると判定したときは、目標温度の設定と目標貯湯量の設定とを無効にして、排熱利用式加熱器にて湯水を加熱する貯湯運転用循環状態で湯水を循環させて、目標温度を越える温度の湯水が目標貯湯量を越える貯湯量で貯湯タンクに貯湯されるように制御する排熱利用貯湯運転制御を実行する。
〔効果〕
目標温度を越える温度の湯水を貯湯タンクに貯湯でき、排熱が有るときはその排熱を最大限利用して、貯湯コストの安い湯水を貯湯できる。
【０００６】
【発明の実施の形態】
本発明にかかる貯湯式の給湯熱源装置の実施の形態をエンジンヒートポンプ式冷暖房給湯システムに適用した例を図面に基づいて説明する。
このエンジンヒートポンプ式冷暖房給湯システムは、図１，図２に示すように、貯湯タンク１内に温度成層を形成して貯湯された湯水を給湯したり、貯湯タンク内１の湯水を加熱して外部放熱部２にて放熱したりする貯湯ユニットＡと、室内の冷暖房をするエンジンヒートポンプ式冷暖房装置Ｂとから構成されている。
【０００７】
前記貯湯ユニットＡは、この貯湯ユニットＡの運転を制御する貯湯ユニット制御部Ｃ、貯湯タンク１、貯湯タンク１内の湯水を循環させる循環路３を備えた湯水循環手段Ｅ、循環路３を通流する湯水を加熱する加熱手段としての加熱部４、循環路３を通流する湯水と熱交換して放熱する外部放熱部２などから構成され、循環ポンプＰ１の作動で貯湯タンク１内の湯水を循環路３にて循環させながら、加熱部４にて加熱したり、外部放熱部２にて放熱したりするようにしている。
【０００８】
前記貯湯タンク１には、その底部から貯湯タンク１に水道水圧を用いて給水する給水路５が接続され、その上部から風呂場や台所などに給湯するための給湯路６が接続され、風呂場や台所などで使用された量だけの水を給水路５から貯湯タンク１に給水するように構成されている。
また、貯湯タンク１の内側には、貯湯タンク１内の湯水の温度を検出する４個の温度センサとしての貯湯温度サーミスタＳ１，Ｓ２，Ｓ３，Ｓ４が上下に分散配置して設けられている。
【０００９】
前記給湯路６には、給水路５から分岐された混合用給水路７が接続され、その接続箇所に給湯路６からの湯水と混合用給水路７からの水との混合比を調整自在なミキシングバルブ８が設けられている。
前記給水路５と混合用給水路７との分岐箇所には、給水温度を検出する給水サーミスタ９が設けられ、給水路５および混合用給水路７の夫々には、逆止弁１０が設けられている。
ちなみに、給湯路６には、オーバーフロー路１１が接続され、そのオーバーフロー路１１にエアー抜き弁１２が設けられている。
【００１０】
また、給湯路６におけるミキシングバルブ８よりも上流側には、貯湯タンク１の上部から給湯路６に給湯された湯水の温度を検出する貯湯出口サーミスタ１３が設けられ、給湯路６におけるミキシングバルブ８よりも下流側には、ミキシングバルブ８にて混合された湯水の温度を検出するミキシングサーミスタ１４、給湯路６の湯水の流量を調整する給湯用水比例バルブ１５が設けられている。
【００１１】
前記給湯用水比例バルブ１５よりも下流側の給湯路６が、台所や洗面所などの給湯栓に給湯する一般給湯路１６と、浴槽に湯水を供給するための湯張り路１７とに分岐され、湯張り路１７が浴槽からの風呂戻り路１８に接続され、風呂戻り路１８および風呂往き路１９の両路を通して浴槽に湯水を供給するようにしている。
前記一般給湯路１６には、一般給湯路１６を通流する湯水の流量を検出する給湯流量センサ２０が設けられ、湯張り路１７には、湯張り路１７を通流する湯水の流量を検出する湯張り流量センサ２１、湯張り電磁弁２２、バキュームブレーカ２３、湯張り逆止弁２４が上流側から順に設けられている。
【００１２】
前記循環路３と貯湯タンク１とが、循環路３を通流する湯水を貯湯タンク１内に戻す、または、貯湯タンク１内の湯水を循環路３に取り出すために、貯湯タンク１の上部１箇所と底部２箇所の合計３箇所で連通接続されている。
具体的に説明すると、貯湯タンク１の上部には、循環路３と貯湯タンク１とを接続する上部接続路２５が給湯路６の上流側を介して連通接続され、貯湯タンク１の底部には、循環路３を通流する湯水を給水路５の下流側を介して貯湯タンク１内の底部に戻す戻し路２６と、貯湯タンク１内の底部の湯水を循環路３に取り出す取り出し路２７とが連通接続されている。
【００１３】
そして、上部接続路２５には、電磁式の上部開閉弁２８が設けられ、戻し路２６には、戻し開閉弁２９が設けられ、上部開閉弁２８を開弁させることによって、循環路３を通流する湯水を貯湯タンク１内の上部に供給したり、貯湯タンク１内の上部の湯水を循環路３に取り出したりするようにし、戻し開閉弁２９を開弁させることによって、循環路３を通流する湯水を貯湯タンク１内の底部に戻すことができるようにしている。
ちなみに、取り出し路２７には、貯湯タンク１内の湯水を排水するための排水路３０が接続され、その排水路３０の途中部には、安全弁３１と手動バルブ３２とが並列に接続されている。
【００１４】
前記加熱部４は、エンジンヒートポンプ式冷暖房装置Ｂによる冷媒を供給して湯水を加熱するヒートポンプ式加熱器３３と、他装置駆動機としてのエンジンヒートポンプ式冷暖房装置Ｂの駆動用ガスエンジン７７のエンジン排熱を利用してそのエンジン排熱で湯水を加熱するエンジン排熱利用式加熱器３４と、バーナ３６の燃焼により湯水を加熱する補助加熱器３５とを設けて構成されている。
そして、循環路３の湯水の循環方向において上流側から順に、ヒートポンプ式加熱器３３、エンジン排熱利用式加熱器３４、補助加熱器３５が設けられ、ヒートポンプ式加熱器３３と補助加熱器３５とが、他装置駆動機７７の排熱を利用しないで湯水を加熱する排熱非利用式加熱器Ｕに構成されている。
【００１５】
前記補助加熱器３５は、ガス燃焼式のバーナ３６に燃焼用空気を供給するファン３７などが設けられ、バーナ３６の燃焼により循環路３を通流する湯水を加熱するように構成されている。
前記バーナ３６に燃料ガスを供給する燃料供給路３８には、上流側から順にガスセフティ弁３９、ガス比例弁４０、ガスメイン弁４１が設けられている。
【００１６】
前記外部放熱部２は、循環路３を通流する湯水と暖房用の熱媒としての温水とを熱交換する暖房用熱交換部４２と、循環路３を通流する湯水と浴槽内の湯水とを熱交換して追焚きする風呂用熱交換部４３とを設けて構成されている。
そして、循環路３が、暖房用熱交換部４２を備えた暖房用循環路３ａと、風呂用熱交換部４３を備えた風呂用循環路３ｂとに分岐され、暖房用熱交換部４２と風呂用熱交換部４３とが並列に接続されている。
また、暖房用循環路３ａには、暖房用熱交換部４２よりも湯水の循環方向の上流側に電磁式の暖房用開閉弁４４が設けられ、風呂用循環路３ｂには、風呂用熱交換部４３よりも湯水の循環方向の上流側に電磁式の風呂用開閉弁４５が設けられている。
【００１７】
前記暖房用熱交換部４２には、暖房ポンプＰ２を作動させることにより、暖房戻り路４６および暖房往き路４７を通して循環する暖房用熱媒を、循環路３を通流する湯水にて加熱するように構成されている。
そして、暖房戻り路４６には、上流側から順に、暖房戻り路４６の暖房用熱媒の温度を検出する暖房戻りサーミスタ４８、補給水タンク４９、暖房ポンプＰ２が設けられ、暖房往き路４７には、暖房往き路４７の暖房用熱媒の温度を検出する暖房往きサーミスタ５０が設けられている。
【００１８】
前記補給水タンク４９には、水位の上限を検出する上限センサ５１と下限を検出する下限センサ５２とが設けられ、補給水タンク４９に給水するためのタンク給水路５３が接続され、そのタンク給水路５３には、補給水電磁弁５４が設けられている。
また、暖房戻り路４６の暖房用熱媒を暖房用熱交換部４２を迂回して暖房往き路４７に供給する暖房バイパス路５５が設けられている。
【００１９】
前記風呂用熱交換部４３は、風呂ポンプＰ３を作動させることにより、風呂戻り路１８および風呂往き路１９を通して循環する浴槽内の湯水を循環路３を通流する湯水にて加熱するように構成されている。
そして、風呂戻り路１８には、上流側から順に、浴槽内の湯水の水位を検出する水位センサ５６、風呂戻り路１８の湯水の温度を検出する風呂戻りサーミスタ５７、二方弁５８、風呂ポンプＰ３、風呂水流スイッチ５９が設けられている。
【００２０】
前記循環路３における戻り路２６との接続箇所と取り出し路２７との接続箇所との間には、外部放熱部２を通過した湯水のヒートポンプ式加熱器３３への通流を断続する電磁式のヒートポンプ用開閉弁６０が設けられ、エンジン排熱利用式加熱器３４と補助加熱器３５との間の部分に、補助加熱器３５に通流する湯水の温度を検出する入り温度サーミスタ６１、循環路３を通流する湯水の循環流量Ｑを検出する循環流量センサ６２、循環ポンプＰ１、補助加熱器３５への湯水の通流を断続する電磁式の補助用断続開閉弁６３が設けられている。
【００２１】
前記循環路３における補助用断続開閉弁６３と補助加熱器３５との間には、補助加熱器３５に通流する湯水の循環流量Ｑを検出する水量センサ６４が設けられ、循環路３における補助加熱器３５と上部接続路２５との接続箇所との間には、循環路３を通流する湯水の循環流量Ｑを調整する水比例バルブ６５、加熱部４にて加熱された後の循環路３の湯水の沸き上げ温度Ｔａを検出する貯湯サーミスタ６６が設けられている。
【００２２】
また、循環路３には、外部放熱部２を通過した湯水をヒートポンプ式加熱器３３を迂回してエンジン排熱利用式加熱器３４に流入させるためのヒートポンプ用バイパス路６７と、エンジン排熱利用式加熱器３４を通過した湯水を補助加熱器３５を迂回して循環させるための補助用バイパス路６８とが接続され、ヒートポンプ用バイパス路６７には、電磁式のヒートポンプバイパス開閉弁６９が設けられ、補助用バイパス路６８には、電磁式の補助バイパス開閉弁７０が設けられている。
【００２３】
そして、湯水循環手段Ｅが、循環路３、上部接続路２５、戻し路２６、取り出し路２７、循環ポンプＰ１、および、上部開閉弁２８、暖房用開閉弁４４、風呂用開閉弁４５、戻し開閉弁２９、ヒートポンプ用開閉弁６０、ヒートポンプバイパス開閉弁６９、補助用断続開閉弁６３、補助バイパス開閉弁７０などにより構成され、上部開閉弁２８、暖房用開閉弁４４、風呂用開閉弁４５、戻し開閉弁２９、ヒートポンプ用開閉弁６０、ヒートポンプバイパス開閉弁６９、補助用断続開閉弁６３、補助バイパス開閉弁７０の開閉操作により、貯湯タンク１の底部から取り出した湯水を加熱部４にて加熱したのち、その温水を貯湯タンク１の底部に戻す形態の初期運転用循環状態で湯水を循環させる貯湯初期運転と、貯湯タンク１内に湯水が温度成層を形成して貯湯されるように、貯湯タンク１の底部から取り出した湯水を加熱部４にて加熱したのち、その温水を貯湯タンク１の上部に供給する形態の貯湯運転用循環状態で湯水を循環させる貯湯運転と、加熱部４にて加熱した湯水を外部放熱部２に供給し、かつ、外部放熱部２を通過した湯水の全量を貯湯タンク１を迂回して加熱部４に直接戻す形態の放熱運転用循環状態で湯水を循環させる放熱運転とに切り換え自在に構成されている。
【００２４】
また、循環調整手段Ｆが、給水サーミスタ９，入り温度サーミスタ６１，循環流量センサ６２，水比例バルブ６５、貯湯サーミスタ６６，貯湯温度サーミスタＳ１，Ｓ２，Ｓ３，Ｓ４などにより構成され、給湯操作手段Ｇが、貯湯出口サーミスタ１３、ミキシングバルブ８、給湯用水比例バルブ１５、給湯流量センサ２０、湯張り流量センサ２１、湯張り電磁弁２２などにより構成され、風呂操作手段Ｈが、水位センサ５６、風呂戻りサーミスタ５７、二方弁５８、風呂ポンプＰ３、風呂水流スイッチ５９などで構成され、暖房操作手段Ｊが、暖房戻りサーミスタ４８、暖房ポンプＰ２、暖房往きサーミスタ５０などで構成されている。
【００２５】
前記貯湯ユニット制御部Ｃは、上部開閉弁２８、暖房用開閉弁４４、風呂用開閉弁４５、戻し開閉弁２９、ヒートポンプ用開閉弁６０、ヒートポンプバイパス開閉弁６９、補助用断続開閉弁６３、補助バイパス開閉弁７０の夫々を開閉制御することにより、初期運転用循環状態で湯水を循環させたり、貯湯運転用循環状態で循環させた湯水を目標貯湯状態で貯湯したり、放熱運転用循環状態で湯水を循環させたりするように構成されている。
【００２６】
前記エンジンヒートポンプ式冷暖房装置Ｂは、複数の室内機７１と室外機７２とを備えて、複数の空調対象空間を空調することができるように構成され、室内機７１と室外機７２と貯湯ユニットＡにおけるヒートポンプ式加熱器３３とが冷媒配管７３で接続され、エンジンヒートポンプ式冷暖房装置Ｂにおける冷媒をヒートポンプ式加熱器３３に供給できるように構成されている。
前記複数の室内機７１の夫々には、室内熱交換器７５、その室内熱交換器７５で温調した空気を空調対象空間へ送出する室内空調用送風機７６などが備えられている。
【００２７】
前記室外機７２には、電子膨張弁７４，８９、ガスエンジン７７、ガスエンジン７７にて駆動される冷媒圧縮機７８、アキュムレータ７９、四方弁８０、室外熱交換器８１、その室外熱交換器８２に対し外気を通風する室外空調用送風機８２、ラジエータ８３、ラジエータ用送風機８４、ヒートポンプ運転制御部Ｄなどが備えられている。
また、ガスエンジン７７の冷却用の冷却水をラジエータ８３との間で循環させる冷却水路８５が設けられ、この冷却水路８５にラジエター用ポンプＰ４とエンジン出口側での冷却水温度を検出する冷却水温度サーミスタ９５が設けられ、ガスエンジン７７の排熱を回収した冷却水を、加熱用冷却水路９１を通してエンジン排熱利用式加熱器３４に供給する加熱状態と、ラジエータ８３に供給して放熱される放熱状態とに切り換え自在な排熱切換機構８６が設けられている。
【００２８】
そして、ヒートポンプ運転手段Ｋが、ガスエンジン７７、電子膨張弁７４，８９、室内空調用送風機７６、冷媒圧縮機７８、四方弁８０、室外空調用送風機８２、低圧側の冷媒圧力を検出する低圧検出手段８７、高圧側の冷媒圧力を検出する高圧検出手段８８などにより構成され、冷却水循環手段Ｌが、冷却水路８５、加熱用冷却水路９１、ラジエータ用ポンプＰ４、ラジエータ用送風機８４、排熱切換機構８６、冷却水温度サーミスタ９５などにより構成されている。
【００２９】
前記貯湯ユニット制御部Ｃとヒートポンプ運転制御部Ｄとは、エンジンヒートポンプ式冷暖房装置Ｂが空調運転中であることや、エンジンヒートポンプ式冷暖房装置Ｂへの駆動要求などの制御信号を送受信可能に構成にされ、図３に示すように、空調対象空間としての各部屋に設置されている空調リモコン９３および貯湯リモコン９２の指令に基づいて、空調対象空間への空調冷房運転や空調暖房運転などの空調運転、貯湯タンク１内に湯水を貯湯する貯湯運転、外部放熱部２にて放熱する放熱運転、貯湯タンク１内の貯湯量が最低確保量未満のときに給湯する給湯優先運転などの夫々の運転を実行するように構成されている。
【００３０】
前記エンジンヒートポンプ式冷暖房装置Ｂの運転について説明すると、空調リモコン９３から空調冷房要求や空調暖房要求などの空調要求があると、ヒートポンプ運転制御部Ｄがヒートポンプ運転手段Ｋおよび冷却水循環手段Ｌの運転を制御し、空調リモコン９３による空調要求に基づいて、ガスエンジン７７により圧縮機７８を作動させて、四方弁８０の切換え操作により空調冷房運転と空調暖房運転とを選択切換え、室内機７１の電子膨張弁７４の開閉制御により、各空調対象空間への空調を切り換えて、ヒートポンプ運転手段Ｋを制御するように構成されている。
【００３１】
すなわち、ヒートポンプ運転制御部Ｄは、空調リモコン９３から空調冷房要求があると、空調冷房要求がある部屋に相当する電子膨張弁７４を開状態にして、室内熱交換器７５を蒸発器として機能させて、空調対象空間への供給空気を冷却温調し、室外熱交換器８１を凝縮器として機能させて外気に対して放熱させるように、ヒートポンプ運転手段Ｋを制御して空調冷房運転を実行する。
また、ヒートポンプ運転制御部Ｄは、空調リモコン９３から空調暖房要求があると、空調暖房要求がある部屋に相当する電子膨張弁７４を開状態にして、室内熱交換器７５を凝縮器として機能させて、空調対象空間への供給空気を加熱温調し、室外熱交換器８１を蒸発器として機能させて外気から吸熱させるように、ヒートポンプ運転手段Ｋを制御して空調暖房運転を実行する。
【００３２】
尚、ヒートポンプ運転制御部Ｄは、空調冷房運転においても、空調暖房運転においても、冷媒圧力が設定目標圧力になるように、冷媒圧縮機７８の回転速度を、検出した冷媒圧力と設定目標圧力との偏差に基づいてフィードバック制御し、その制御における時定数は充分大きく設定されていて、回転速度の増減変更は緩やかな速度で行われる。
【００３３】
そして、冷却水循環手段Ｌは、空調冷房運転において、ラジエータ用ポンプＰ４を作動させ、ラジエータ用送風機８４を作動させてラジエータ８３にて放熱させるようにし、エンジン排熱利用式加熱器３４にて加熱可能なときには、冷却水路８５を通流する冷却水が加熱用設定温度以上になると、排熱切換機構８６を加熱状態に切り換えて、冷却水をエンジン排熱利用式加熱器３４に供給するようにしている。
また、空調暖房運転において、ラジエータ用ポンプＰ４を作動させ、ラジエータ用送風機８４を作動させてラジエータ８３にて放熱させるようにし、エンジン排熱利用式加熱器３４にて加熱可能なときには、暖房負荷が小さくかつ冷却水路８５を通流する冷却水が加熱用設定温度以上になると、排熱切換機構８６を加熱状態に切り換えて、冷却水をエンジン排熱利用式加熱器３４に供給するようにしている。
【００３４】
前記空調冷房運転においては、室内熱交換器７５を蒸発器として機能させて空調対象空間への供給空気を冷却温調し、室外熱交換器８１を凝縮器として機能させて外気に対して放熱するようにしている。
この空調冷房運転では、ヒートポンプ運転制御部Ｄは、低圧検出手段８７の検出情報に基づいて、その検出圧力が冷房用の目標圧力になるようにガスエンジン７７の回転速度を制御するようにしている。
また、空調冷房運転において、ヒートポンプ運転制御部Ｄは、排熱切換機構８６を加熱状態に切り換えて冷却水をエンジン排熱利用式加熱器３４に供給し、循環路３を通流する湯水をエンジン排熱で加熱するようにしている。
【００３５】
前記空調冷房運転における冷媒の流れについて説明を加えると、冷媒圧縮機７８から吐出される高圧乾き蒸気冷媒を、四方弁８０を介して室外熱交換器８１に供給し、この室外熱交換器８１において外気との熱交換により凝縮される。
そして、室外熱交換器８１から送出される凝縮工程通過冷媒を、電子膨張弁７４を介して室内熱交換器７５に供給し、この室内熱交換器７５において冷却対象空気との熱交換により蒸発される。
その後、室内熱交換器７５から送出される低圧乾き蒸気冷媒を、四方弁８０およびアキュムレータ７９を介して冷媒圧縮機７８の吸入口に戻す。
【００３６】
前記空調暖房運転においては、室内熱交換器７５を凝縮器として機能させて空調対象空間への供給空気を加熱温調し、室外熱交換器８１を蒸発器として機能させて外気から吸熱するようにしている。
この空調暖房運転では、ヒートポンプ運転制御部Ｄは、高圧検出手段８８の検出情報に基づいて、その検出圧力が暖房用の目標圧力になるようにガスエンジン７７の回転速度を制御するようにしている。
また、この空調暖房運転において、加熱用冷媒配管９０を通してヒートポンプ式加熱器３３に高圧冷媒を供給する加熱用運転により、循環路３を通流する湯水を加熱するようにしている。
【００３７】
前記空調暖房運転における冷媒の流れについて説明を加えると、電子膨張弁７４，８９が所定開度になるように制御する初期制御を行い、高圧検出手段８８の検出圧力が目標圧力になるように、ガスエンジン７７の回転数を増減して、冷媒圧縮機７８の回転速度を制御し、冷媒圧縮機７８から吐出される高圧乾き蒸気冷媒を、四方弁８０を介して室内熱交換器７５およびヒートポンプ式加熱器３３に供給し、室内熱交換器７５においては加熱対象空気との熱交換により凝縮され、ヒートポンプ式加熱器３３においては循環路３の湯水との熱交換により凝縮される。
【００３８】
そして、室内熱交換器７５から送出される凝縮工程通過冷媒を、電子膨張弁７４を介して室外熱交換器８１に供給するとともに、ヒートポンプ式加熱器３３から送出される凝縮工程通過冷媒を、電子膨張弁８９を介して室外熱交換器８１に供給して、この室外熱交換器８１において外気との熱交換により蒸発される。
その後、室外熱交換器８１から送出される低圧乾き蒸気冷媒を四方弁８０およびアキュムレータ７９を介して冷媒圧縮機７８の吸入口に戻す。
【００３９】
尚、電子膨張弁７４，８９の初期制御が完了したあとは、室内熱交換器７５やヒートポンプ式加熱器３３の下流側における冷媒温度を冷媒温度センサ９６で検出して、この検出温度が飽和液温度から所定値を引いた目標温度になるように、電子膨張弁７４，８９の開度を調整するサブクール制御を実行する。
つまり、サブクール制御は、室内熱交換器７５やヒートポンプ式加熱器３３で凝縮して放熱し、その結果、冷却された冷媒の温度を冷媒温度センサ９６で検出して、その検出温度が、高圧検出手段８８で検出した検出圧力を基にして予めメモリに記憶されているデータから求まる飽和液温度よりも、所定値( サブクール値) だけ低くなるように電子膨張弁７４，８９の開度を調整する。
【００４０】
そして、飽和液温度から所定値を引いた目標温度に対して冷媒温度センサ９６による検出温度が高いほど、電子膨張弁７４，８９の開度を小さくすることにより、冷媒の循環量が減少して、その分、所定冷媒量当たりの放熱量が増加して冷媒温度センサ９６による検出温度が低下し、かつ、高圧検出手段８８による検出圧力が増加して飽和液温度が上昇して、冷媒温度センサ９６による検出温度を目標温度と略同等にすることができる。
また、目標温度に対して冷媒温度センサ９６による検出温度が低いほど、電子膨張弁７４，８９の開度を大きくすることにより、冷媒の循環量が増加して、その分、所定冷媒量当たりの放熱量が減少して冷媒温度センサ９６による検出温度が上昇し、かつ、高圧検出手段８８による検出圧力が減少して飽和液温度が低下して、冷媒温度センサ９６による検出温度を目標温度と略同等にすることができる。
【００４１】
また、貯湯ユニット制御部Ｃには、貯湯タンク１内の貯湯量Ｒを検出する貯湯量検出手段Ｍや、貯湯タンク１に貯湯する目標貯湯量Ｒａを設定する目標貯湯量設定手段Ｎなどが設けられている。
前記貯湯量検出手段Ｍと目標貯湯量設定手段Ｎはプログラム形式で設けられ、貯湯量検出手段Ｍは、貯湯温度サーミスタＳ１，Ｓ２，Ｓ３，Ｓ４のうちで貯湯設定温度Ｔｅ以上の温度を検出する最下位の貯湯温度サーミスタがいずれの貯湯温度サーミスタＳ１，Ｓ２，Ｓ３，Ｓ４であるかにより、その貯湯温度サーミスタＳ１，Ｓ２，Ｓ３，Ｓ４の検出位置に対応する量として予め設定されている量の湯水を貯湯量Ｒとして検出するように構成され、目標貯湯量設定手段Ｎは、４個の貯湯温度サーミスタＳ１，Ｓ２，Ｓ３，Ｓ４のいずれかに対応する貯湯量Ｒを目標貯湯量Ｒａとして設定するように構成されている。
【００４２】
そして、最上部の貯湯温度サーミスタＳ１に対応する貯湯量Ｒが最低確保量Ｒmin として、上から２番目の貯湯温度サーミスタＳ２に対応する貯湯量Ｒが小貯湯量Ｒs として、上から３番目の貯湯温度サーミスタＳ３に対応する貯湯量Ｒが中貯湯量Ｒm として、また、最下部の貯湯温度サーミスタＳ４に対応する貯湯量Ｒが最大貯湯量Ｒmax として、夫々、予め設定されている。
ちなみに、本実施形態では、最低確保量Ｒmin が１７リットル、小貯湯量Ｒs が３０リットル、中貯湯量Ｒm が７０リットル、最大貯湯量Ｒmax が１１３リットルとして設定されている。
【００４３】
次に、貯湯ユニットＡの運転について説明すると、貯湯リモコン９２の要求指令やヒートポンプ運転手段Ｋの運転状態などに基づいて、貯湯ユニット制御部Ｃが、湯水循環手段Ｅ、循環調整手段Ｆ、給湯操作手段Ｇ、風呂操作手段Ｈ、暖房操作手段Ｊ、補助加熱器３５の夫々の運転を制御して、貯湯運転、放熱運転、および、給湯優先運転などの夫々の運転を実行するように構成されている。
【００４４】
前記湯水循環手段Ｅについて具体的に説明すると、この湯水循環手段Ｅは、貯湯タンク１に湯水を貯湯するときに、貯湯運転用循環状態としてのヒートポンプ貯湯運転用循環状態( 以下、ＨＰ貯湯運転用循環状態という) 、排熱貯湯運転用循環状態および補助熱源貯湯運転用循環状態と、初期運転用循環状態としてのヒートポンプ貯湯初期運転用循環状態( 以下、ＨＰ貯湯初期運転用循環状態という) 、排熱貯湯初期運転用循環状態および補助熱源貯湯初期運転用循環状態と、外部放熱部２にて放熱するときの放熱運転用循環状態としての追焚き運転用循環状態、暖房運転用循環状態および暖房・追焚き同時運転用循環状態の夫々に切り換えられるように構成されている。
【００４５】
そして、貯湯タンク１に湯水を貯湯するときには、ヒートポンプ式加熱器３３、エンジン排熱利用式加熱器３４または補助加熱器３５にて加熱された湯水の温度が貯湯許容温度に満たないときには、ＨＰ貯湯初期運転用循環状態、排熱貯湯初期運転用循環状態または補助熱源貯湯初期運転用循環状態に切り換えて貯湯タンク１内の湯水を循環させ、ヒートポンプ式加熱器３３、エンジン排熱利用式加熱器３４または補助加熱器３５にて加熱された湯水の温度が貯湯許容温度になると、ＨＰ貯湯運転用循環状態、排熱貯湯運転用循環状態または補助熱源貯湯運転用循環状態に切り換えて貯湯タンク１に貯湯するようにしている。
また、外部放熱部２にて放熱するときには、追焚き要求のみの要求があると、追焚き運転用循環状態に切り換え、暖房要求のみの要求があると、暖房運転用循環状態に切り換え、追焚き要求および暖房要求の両要求があると、暖房・追焚き同時運転用循環状態に切り換えるようにしている。
【００４６】
以下、湯水循環手段Ｅの夫々の状態について説明を加える。
なお、この湯水循環手段Ｅの夫々の状態における説明において、上部開閉弁２８、戻し開閉弁２９、暖房用開閉弁４４、風呂用開閉弁４５、放熱用開閉弁９７、ヒートポンプ用開閉弁６０、補助用断続開閉弁６３、ヒートポンプバイパス開閉弁６９，および、補助バイパス開閉弁７０の開閉状態について、開弁させる開閉弁のみを記載し、記載していない開閉弁については閉弁させるものとする。
【００４７】
前記ＨＰ貯湯運転用循環状態においては、上部開閉弁２８および補助バイパス開閉弁７０を開弁させるとともに、循環ポンプＰ１を作動させ、貯湯タンク１内に湯水が温度成層を形成して貯湯させるように、貯湯タンク１の底部から取り出した湯水をヒートポンプ式加熱器３３にて加熱したのち、その温水を補助加熱器３５を迂回して貯湯タンク１の上部に戻すようにしている。
【００４８】
前記排熱貯湯運転用循環状態においては、上部開閉弁２８および補助バイパス開閉弁７０を開弁させるとともに、循環ポンプＰ１を作動させ、貯湯タンク１内に湯水が温度成層を形成して貯湯させるように、貯湯タンク１の底部から取り出した湯水をエンジン排熱利用式加熱器３４にて加熱したのち、その温水を補助加熱器３５を迂回して貯湯タンク１の上部に戻すようにしている。
【００４９】
前記補助熱源貯湯運転用循環状態においては、上部開閉弁２８および補助用断続開閉弁６３を開弁させるとともに、循環ポンプＰ１を作動させ、貯湯タンク１内に湯水が温度成層を形成して貯湯させるように、貯湯タンク１の底部から取り出した湯水を補助加熱器３５にて加熱したのち、その温水を貯湯タンク１の上部に戻すようにしている。
【００５０】
前記ＨＰ貯湯初期運転用循環状態においては、戻し開閉弁２９、暖房用開閉弁４４および補助バイパス開閉弁７０を開弁させるとともに、循環ポンプＰ１を作動させ、貯湯タンク１の底部から取り出した湯水をヒートポンプ式加熱器３３にて加熱したのち、その湯水を補助加熱器３５を迂回して貯湯タンク１の底部に戻すようにしている。
【００５１】
前記排熱貯湯初期運転用循環状態においては、戻し開閉弁２９、暖房用開閉弁４４および補助バイパス開閉弁７０を開弁させるとともに、循環ポンプＰ１を作動させ、貯湯タンク１の底部から取り出した湯水をエンジン排熱利用式加熱器３４にて加熱したのち、その湯水を補助加熱器３５を迂回して貯湯タンク１の底部に戻すようにしている。
【００５２】
前記補助熱源貯湯初期運転用循環状態においては、戻し開閉弁２９、暖房用開閉弁４４および補助用断続開閉弁６３を開弁させるとともに、循環ポンプＰ１を作動させ、貯湯タンク１の底部から取り出した湯水を補助加熱器３５にて加熱したのち、その湯水を貯湯タンク１の底部に戻すようにしている。
【００５３】
前記追焚き運転用循環状態においては、ヒートポンプ式加熱器３３にて加熱するときは、風呂用開閉弁４５、ヒートポンプ用開閉弁６０および補助バイパス開閉弁７０を開弁させるとともに、循環ポンプＰ１を作動させて、ヒートポンプ式加熱器３３にて加熱された温水を補助加熱器３５を迂回して風呂用熱交換部４３に取り出して放熱させたのち、その全量を貯湯タンク１を迂回してヒートポンプ式加熱器３３に戻し( ＨＰ追焚き運転用循環状態) 、補助加熱器３５にて加熱するときは、風呂用開閉弁４５、補助用断続開閉弁６３およびヒートポンプバイパス開閉弁６９を開弁させるとともに、循環ポンプＰ１を作動させて、補助加熱器３５にて加熱された温水を風呂用熱交換部４３にて放熱させたのち、その全量を貯湯タンク１とヒートポンプ式加熱器３３とを迂回して補助加熱器３５に戻す( 補助加熱追焚き運転用循環状態) ようにしている。
【００５４】
前記暖房運転用循環状態においては、暖房用開閉弁４４、補助用断続開閉弁６３およびヒートポンプバイパス開閉弁６９を開弁させるとともに、循環ポンプＰ１を作動させ、補助加熱器３５にて加熱された温水を暖房用熱交換部４２にて放熱させたのち、その全量を貯湯タンク１とヒートポンプ式加熱器３３とを迂回して補助加熱器３５に戻すようにしている。
前記暖房・追焚き同時運転用循環状態においては、暖房用開閉弁４４、風呂用開閉弁４５、補助用断続開閉弁６３およびヒートポンプバイパス開閉弁６９を開弁させるとともに、循環ポンプＰ１を作動させ、補助加熱器３５にて加熱された温水を風呂用熱交換部４３および暖房用熱交換部４２にて放熱させたのち、その全量を貯湯タンク１とヒートポンプ式加熱器３３とを迂回して補助加熱器３５に戻すようにしている。
【００５５】
前記貯湯ユニット制御部Ｃの運転として、貯湯運転、排熱貯湯運転、放熱運転、給湯優先運転について説明する。
前記貯湯運転は、エンジンヒートポンプ式冷暖房装置Ｂが空調暖房運転中であるか否かにより、ヒートポンプ貯湯運転( 以下、ＨＰ貯湯運転という) または補助熱源貯湯運転のいずれかを選択して実行され、エンジンヒートポンプ式冷暖房装置Ｂが空調暖房運転中に貯湯リモコン９２から指令される加熱要求としての貯湯要求があると、補助加熱器３５を運転させて貯湯する補助熱源貯湯運転を実行させて補助熱源優先運転を実行し、エンジンヒートポンプ式冷暖房装置Ｂが空調暖房運転中ではないときに貯湯要求があると、エンジンヒートポンプ式冷暖房装置Ｂを空調暖房運転させて貯湯するＨＰ貯湯運転を実行させてヒートポンプ優先運転を実行するように構成されている。
【００５６】
そして、エンジンヒートポンプ式冷暖房装置Ｂが空調暖房運転中に空調リモコン９３からの空調暖房要求が解除された状態において、貯湯要求があると、エンジンヒートポンプ式冷暖房装置Ｂの運転を継続したままＨＰ貯湯運転を実行するように構成されている。
また、ＨＰ貯湯運転中に、エンジンヒートポンプ式冷暖房装置Ｂへの空調暖房要求があると、ガスエンジン７７の回転速度や暖房要求されている部屋の暖房負荷などに基づいて、ＨＰ貯湯運転を継続している状態でのエンジンヒートポンプ式冷暖房装置Ｂの空調能力が空調負荷に対して余裕があるのか不足しているのかを判別し、空調能力に余裕があるときには、ＨＰ貯湯運転を継続するとともに、エンジンヒートポンプ式冷暖房装置Ｂにて空調暖房運転させる空調追加運転を実行し、空調能力が不足しているときには、ＨＰ貯湯運転から補助熱源貯湯運転に切り換えかつエンジンヒートポンプ式冷暖房装置Ｂにて空調暖房運転させるように構成されている。
【００５７】
前記貯湯運転におけるＨＰ貯湯運転について具体的に説明すると、まず、エンジンヒートポンプ式冷暖房装置Ｂを暖房運転させて高圧冷媒をヒートポンプ式加熱器３３に供給するととともに、湯水循環手段ＥをＨＰ貯湯初期運転用循環状態にて運転させ、貯湯タンク１内の湯水をヒートポンプ式加熱器３３にて加熱させる。
そして、貯湯サーミスタ６６にて検出される温度が貯湯許容温度以上になると、湯水循環手段ＥをＨＰ貯湯初期運転用循環状態からＨＰ貯湯運転用循環状態に切り換えるとともに、貯湯タンク１の上部に貯湯される温水の温度が貯湯設定温度となるように、貯湯サーミスタ６６の検出情報に基づいて循環用水比例バルブ６５の開度を調整するようにしている。
【００５８】
このようにして、貯湯タンク１内の湯水が温度成層を形成しながら貯湯され、貯湯タンク１の貯湯量が貯湯リモコン９２などにより設定された目標貯湯量になると、設定時間貯湯タンク１への貯湯を継続したのち、エンジンヒートポンプ式冷暖房装置Ｂの運転を停止させるとともに、循環ポンプＰ１の作動を停止させかつ開弁している開閉弁を閉弁させて湯水循環手段Ｅの運転を停止させる。
ちなみに、目標貯湯量は、「少」、「中」、「満」のうちのひとつが選択でき、例えば、目標貯湯量として「中」が選択されているときには、中部サーミスタＳ３が貯湯設定温度よりも設定温度だけ低い温度を検出すると、貯湯タンク１の貯湯量が目標貯湯量になっていると検出するようにしている。
【００５９】
前記貯湯運転における補助熱源貯湯運転について具体的に説明すると、まず、補助熱源貯湯初期運転用循環状態に切り換えて、貯湯タンク１の底部から取り出した湯水を補助加熱器３５にて加熱したのち、その温水を貯湯タンク１の底部に戻す形態で湯水を循環させる補助熱源貯湯初期運転と、補助熱源貯湯運転用循環状態に切り換えて、貯湯タンク１の底部から取り出した湯水を補助加熱器３５にて加熱したのち、その温水を貯湯タンク１の上部に供給する形態で湯水を循環させる補助熱源貯湯運転とに切り換えて貯湯される。
【００６０】
つまり、貯湯ユニット制御部Ｃは、貯湯用目標温度Ｔｂよりも８℃高い温度を越える沸き上げ温度Ｔａ、又は、貯湯用目標温度Ｔｂよりも１５℃低い温度を越える沸き上げ温度Ｔａが貯湯サーミスタ６６により１秒間継続して検出されるまで、初期運転用循環状態にて湯水を１リットル/minの循環流量で循環させる貯湯初期運転を行い、貯湯用目標温度Ｔｂよりも８℃高い温度を越える沸き上げ温度Ｔａ、又は、貯湯用目標温度Ｔｂよりも１５℃低い温度を越える沸き上げ温度Ｔａが１秒間継続して検出されると、貯湯運転用循環状態に切り換えて、沸き上げ温度Ｔａが貯湯用目標温度Ｔｂになるように循環流量を制御するように構成されている。
【００６１】
このようにして、貯湯タンク１内の湯水が温度成層を形成しながら貯湯され、貯湯タンク１の貯湯量が貯湯リモコン９２などにより設定された目標貯湯量になると、設定時間貯湯タンク１への貯湯を継続したのち、補助加熱器３５の運転を停止させるとともに、循環ポンプＰ１の作動を停止させかつ開弁している開閉弁を閉弁させて湯水循環手段Ｅの運転を停止させる。
【００６２】
前記排熱貯湯運転は、エンジンヒートポンプ式冷暖房装置Ｂの運転中においてそのエンジン排熱を利用して、予め設定されている貯湯用目標温度の湯水が目標貯湯量で貯湯タンク１内に貯湯するもので、排熱貯湯初期運転用循環状態に切り換えて、貯湯タンク１の底部から取り出した湯水をエンジン排熱利用式加熱器３４にて加熱したのち、その温水を貯湯タンク１の底部に戻す形態で湯水を循環させる排熱貯湯初期運転と、排熱貯湯運転用循環状態に切り換えて、貯湯タンク１の底部から取り出した湯水をエンジン排熱利用式加熱器３４にて加熱したのち、その温水を貯湯タンク１の上部に供給する形態で湯水を循環させる排熱貯湯運転とに切り換えて貯湯される。
【００６３】
前記放熱運転は、追焚き要求のみの要求があると、追焚き運転を実行し、暖房要求のみの要求があると、暖房運転を実行し、追焚き要求および暖房要求の両要求があると、暖房・追焚き同時運転を実行するように構成されている。
【００６４】
前記放熱運転における追焚き運転について具体的に説明すると、湯水循環手段Ｅを追焚き運転用循環状態に切り換え、かつ、貯湯サーミスタ６６による検出温度が追焚き用設定温度になるようにファン３７の回転速度およびガス比例弁４０の開度を調整するとともに、風呂ポンプＰ３を作動させて浴槽内の湯水を風呂戻り路１８および風呂往き路１９を通して一定循環流量で循環させる。
そして、風呂用熱交換部４３にて浴槽内の湯水を加熱して追焚きし、風呂戻りサーミスタ５７の検出温度が追焚き用設定温度以上になると、風呂ポンプＰ３の作動を停止するとともに、補助加熱器３５の運転および湯水循環手段Ｅの運転を停止させる。
【００６５】
前記放熱運転における暖房運転について具体的に説明すると、湯水循環手段Ｅを暖房運転用循環状態に切り換え、かつ、貯湯サーミスタ６６による検出温度が暖房用設定温度になるようにファン３７の回転速度およびガス比例弁４０の開度を調整するとともに、暖房ポンプＰ２を作動させて暖房端末からの熱媒を暖房戻り路４６および暖房往き路４７を通して一定循環流量で循環させ、暖房用熱交換部４２にて熱媒を加熱して暖房端末に供給するようにしている。
【００６６】
前記放熱運転における暖房・追焚き同時運転について具体的に説明すると、湯水循環手段Ｅを暖房・追焚き同時運転用循環状態に切り換え、かつ、貯湯サーミスタ６６による検出温度が暖房・追焚き同時用設定温度になるようにファン３７の回転速度およびガス比例弁４０の開度を調整するとともに、風呂ポンプＰ３を作動させて浴槽内の湯水を風呂戻り路１８および風呂往き路１９を通して循環させ、かつ、暖房ポンプＰ２を作動させて暖房端末からの熱媒を暖房戻り路４６および暖房往き路４７を通して循環させる。
そして、浴槽の湯水を追焚きするとともに、暖房端末に暖房用熱交換部４２にて加熱された熱媒を供給するようにしている。
【００６７】
前記給湯優先運転は、貯湯タンク１の貯湯量が最低確保量未満のときに、給湯栓などに給湯するときに実行され、湯水循環手段Ｅを補助熱源貯湯運転用循環状態に切り換え、補助加熱器３５にて加熱された湯水を上部接続路２５から給湯路６に給湯しながら、給湯目標温度、貯湯出口サーミスタ１３および給水サーミスタ９の検出情報に基づいて、給湯する湯水の温度が給湯目標温度になるようにミキシングバルブ８の開度を調整するとともに、ミキシングサーミスタ１４の検出情報に基づいて、その検出温度と給湯目標温度との偏差に基づいてミキシングバルブ８の開度を微調整することにより、給湯目標温度の湯水を給湯するようにしている。
【００６８】
ちなみに、浴槽に湯張りを行うときには、給湯優先運転と同様に、貯湯タンク１の貯湯量が最低確保量未満のときに、給湯栓などに給湯するときに実行され、給湯目標温度、貯湯出口サーミスタ１３および給水サーミスタ９の検出情報に基づいて、給湯する湯水の温度が給湯目標温度になるようにミキシングバルブ８の開度を調整するとともに、ミキシングサーミスタ１４の検出情報に基づいて、その検出温度と給湯目標温度との偏差に基づいてミキシングバルブ８の開度を微調整するとともに、湯張り電磁弁２２を開弁させ、ミキシングバブル８にて給湯目標温度に調整された湯水を風呂戻り路１８および風呂往き路１９の両路から浴槽に供給し、浴槽内に湯張り設定量の湯水が供給されると、湯張り電磁弁２２を閉弁させるようにしている。
【００６９】
前記貯湯ユニットＡの制御動作について、図４〜６のフローチャートに基づいて説明する。
前記貯湯ユニットＡは、図４のフローチャートに示すように、貯湯タンク１の貯湯量が最低確保量未満であって、かつ、給湯栓が開操作されて給湯中であると、給湯優先運転を実行し、貯湯タンク１の貯湯量が最低確保量以上であるか、給湯中でなければ、給湯優先運転を実行していると、補助加熱器３５の運転および循環ポンプＰ１の作動を停止させて給湯優先運転停止処理を実行する。
【００７０】
そして、暖房要求や追焚き要求などの放熱要求があると、放熱運転を実行し、貯湯要求があると、貯湯運転を実行し、エンジンヒートポンプ式冷暖房装置Ｂが運転中であることを示すヒートポンプ運転信号( 以下、ＨＰ運転信号という) がヒートポンプ運転制御部Ｄから入力され、かつ、そのエンジン排熱の冷却水温度が６０℃以上であることを示す排熱６０℃信号、又は、エンジン排熱の冷却水温度が７０℃以上であることを示す排熱７０℃信号がヒートポンプ運転制御部Ｄから入力されていて、貯湯タンク１内の最下部の貯湯温度サーミスタＳ４による検出温度Ｔｇが６０℃未満のときは、排熱貯湯運転を実行する。
【００７１】
前記放熱運転の制御動作について、図５のフローチャートに基づいて説明を加えると、貯湯タンク１の貯湯量が最低確保量未満であって、かつ、給湯栓が開操作されて給湯中であると、給湯優先運転を実行する。
貯湯タンク１の貯湯量が最低確保量以上であるか、給湯中でなければ、給湯優先運転を実行していると、補助加熱器３５の運転および循環ポンプＰ１の作動を停止させて給湯優先運転停止処理を実行する。
【００７２】
そして、追焚き要求がありかつ暖房要求がないときには、追焚き運転を実行し、追焚き要求および暖房要求の両要求があるときには、暖房・追焚き同時運転を実行し、追焚き要求がなくかつ暖房要求があるときには、暖房運転を実行する。
このようにして、追焚き要求および暖房要求のいずれかまたは両方が要求されているかによって、その要求に応えるべく、追焚き運転、暖房運転、暖房・追焚き同時運転の夫々の運転を実行し、追焚き要求および暖房要求のいずれかまたは両方が満たされて要求が完了すると、湯水循環手段Ｅおよび補助加熱器３５の運転を停止させる放熱停止処理を実行する。
【００７３】
前記貯湯運転の制御動作について、図６のフローチャートに基づいて説明を加えると、貯湯タンク１の貯湯量が最低確保量未満であって、かつ、給湯栓が開操作されて給湯中であると、給湯優先運転を実行する。
貯湯タンク１の貯湯量が最低確保量以上であるか、給湯中でなければ、給湯優先運転を実行していると、補助加熱器３５の運転および循環ポンプＰ１の作動を停止させて給湯優先運転停止処理を実行する。
そして、追焚き要求または暖房要求のいずれかの放熱要求があると、放熱運転を実行し、放熱要求がないときはＨＰ貯湯運転を実行する。
【００７４】
このようにして、ＨＰ貯湯運転または補助熱源貯湯運転のいずれかにて貯湯タンク１の貯湯量が目標貯湯量になると、設定時間貯湯タンク１への貯湯を継続したのち、エンジンヒートポンプ式冷暖房装置Ｂまたは補助加熱器３５の運転を停止させるとともに、循環ポンプＰ１の作動を停止させかつ開弁している開閉弁を閉弁させて湯水循環手段Ｅの運転を停止させる貯湯運転停止処理を実行する。
【００７５】
前記排熱貯湯運転の制御動作を、図７〜図１４のフローチャートを参照しながら説明する。
前記排熱貯湯運転では、図７に示すように、湯水循環手段Ｅを排熱貯湯初期運転用循環状態に切り換えて、貯湯タンク１の底部から取り出した湯水をエンジン排熱利用式加熱器３４にて加熱したのち、その温水を貯湯タンク１の底部に戻す形態で湯水を循環させる排熱貯湯初期運転を実行した後、湯水循環手段Ｅを排熱貯湯運転用循環状態に切り換えて、貯湯タンク１の底部から取り出した湯水をエンジン排熱利用式加熱器３４にて加熱したのち、その温水を貯湯タンク１の上部に供給する形態で湯水を循環させて、貯湯用目標温度( 本実施形態では、予め、６０℃又は６７℃が設定されている) Ｔｂの湯水を目標貯湯量で貯湯する排熱貯湯運転を実行する。
【００７６】
前記排熱貯湯初期運転について説明する。
前記排熱貯湯初期運転による運転制御では、図８に示すように、タイマ９４をリセットし、湯水循環手段Ｅを排熱貯湯初期運転用循環状態に切り換えて循環ポンプＰ１を作動させて、循環流量が初期目標流量( １リットル/min) になるように水比例バルブ６５の開度を制御し、貯湯タンク１の底部から取り出した湯水をエンジン排熱利用式加熱器３４にて加熱したのち、補助用バイパス路６８と暖房用循環路３ａとを通って貯湯タンク１の底部に戻す形態で、貯湯用目標温度Ｔｂよりも２０℃低い温度を越える沸き上げ温度Ｔａが貯湯サーミスタ６６により５秒間継続して検出されるまで、循環路３を循環させる( ステップ＃１〜＃４) 。
【００７７】
そして、貯湯用目標温度Ｔｂが６０℃の場合は、貯湯用目標温度Ｔｂよりも４℃低い温度未満の沸き上げ温度Ｔａが１０分間継続して検出されると排熱貯湯停止処理を実行し、貯湯用目標温度Ｔｂが６７℃の場合は、貯湯用目標温度Ｔｂよりも４℃低い温度未満の沸き上げ温度Ｔａが１５分間継続して検出されると排熱貯湯停止処理を実行する( ステップ＃５〜＃１０) 。
【００７８】
前記排熱貯湯停止処理は、図９に示すように、循環ポンプＰ１が作動しているときはその作動を停止するとともに、タイマ９４をリセットし、タイマ９４の積算時間が３０分になると、排熱貯湯初期運転による運転制御に戻る( ステップ＃１１〜＃１４) 。
【００７９】
前記排熱貯湯運転について説明する。
前記排熱貯湯運転による運転制御では、図１０，図１１に示すように、タイマ９４をリセットして、湯水循環手段Ｅを排熱貯湯運転用循環状態に切り換え、沸き上げ温度Ｔａが貯湯用目標温度Ｔｂよりも４．５℃低い温度を越えているときはフラグ１を立て、貯湯用目標温度Ｔｂの湯水が目標貯湯量で貯湯されるまで排熱貯湯運転用流量制御を実行する( ステップ＃２１〜＃２６) 。
【００８０】
そして、貯湯用目標温度Ｔｂの湯水が目標貯湯量で貯湯されている状態で、ＨＰ運転信号がヒートポンプ運転制御部Ｄから入力されているか否かや、排熱６０℃信号、又は、排熱７０℃信号がヒートポンプ運転制御部Ｄから入力されているか否かを判別し、ＨＰ運転信号と、排熱６０℃信号又は排熱７０℃信号とが入力されていて、貯湯タンク１に目標貯湯状態で湯水が貯湯されている状態でガスエンジン７７の排熱が有ると判定したときは( ステップ＃２６〜＃２８) 、エンジン排熱利用式加熱器３４にて湯水を加熱する排熱貯湯運転用循環状態で湯水を循環させて、目標貯湯状態を越える貯湯状態で貯湯タンク１に貯湯する排熱利用貯湯運転制御を実行する( ステップ＃２９〜＃３２) 。
【００８１】
つまり、貯湯用目標温度Ｔｂの湯水が目標貯湯量で貯湯されている状態でガスエンジン７７の排熱が有ると判定したときは、目標貯湯量が最大貯湯量に設定されていない場合は、その目標貯湯量の設定を無効にして、目標貯湯量の設定を最大貯湯量に変更するとともにフラグ２を立て、貯湯用目標温度Ｔｂの湯水が最大貯湯量で貯湯タンク１に貯湯されるまで、排熱貯湯運転用流量制御を実行する( ステップ＃２９，＃３０) 。
【００８２】
また、目標貯湯量が最大貯湯量に設定されている状態で、貯湯用目標温度Ｔｂが６０℃に設定されているときは、その貯湯用目標温度Ｔｂ( ６０℃) の設定を無効にして、その貯湯用目標温度Ｔｂを越える温度の湯水が貯湯タンク１に貯湯されるように、貯湯用目標温度Ｔｂの設定を６７℃に変更するとともにフラグ３を立て、貯湯用目標温度Ｔｂの湯水が最大貯湯量で貯湯タンク１に貯湯されるまで、排熱貯湯運転用流量制御を実行する( ステップ＃３１，＃３２) 。
【００８３】
従って、貯湯用目標温度Ｔｂの元の設定が６０℃で、かつ、目標貯湯量の元の設定が最大貯湯量でない場合は、元の貯湯用目標温度Ｔｂを越える温度の湯水が元の目標貯湯量を越える貯湯量で貯湯されることになる。
そして、ガスエンジン７７の排熱が無いと判定したときや、貯湯用目標温度Ｔｂが６７℃に設定されている状態で最大貯湯量の湯水が貯湯されているときは、目標貯湯量の設定を変更している場合は、その目標貯湯量の設定を元の設定に戻し、また、貯湯用目標温度Ｔｂの設定を変更している場合は、その貯湯用目標温度Ｔｂの設定を元の６０℃に戻す( ステップ＃３３〜＃３６) 。
【００８４】
前記排熱貯湯運転用流量制御について、図１２，図１３を参照しながら説明する。
前記排熱貯湯運転用流量制御では、貯湯サーミスタ６６により検出される沸き上げ温度Ｔａが貯湯用目標温度Ｔｂよりも１℃低い温度以上で、かつ、貯湯用目標温度Ｔｂよりも１℃高い温度以下の貯湯用目標温度範囲の温度であるときは、循環流量を現状に維持し、沸き上げ温度Ｔａが貯湯用目標温度範囲の温度を越えているときは、沸き上げ温度Ｔａが貯湯用目標温度Ｔｂよりも２．５℃高い温度未満であれば、循環流量を０．１リットル/min増加させ、沸き上げ温度Ｔａが貯湯用目標温度Ｔｂよりも２．５℃高い温度以上であっても、貯湯用目標温度Ｔｂよりも５℃高い温度以下であれば、循環流量を０．１リットル/min増加させ、沸き上げ温度Ｔａが貯湯用目標温度Ｔｂよりも５℃高い温度を越えていれば、循環流量を０．２リットル/min増加させる( ステップ＃４１〜＃４６) 。
【００８５】
また、沸き上げ温度Ｔａが貯湯用目標温度範囲の温度を下回っているときは、フラグ１が立っていない状態で沸き上げ温度Ｔａが貯湯用目標温度Ｔｂよりも２３℃低い温度以下であったり、フラグ１が立っている状態で沸き上げ温度Ｔａが貯湯用目標温度Ｔｂよりも６℃低い温度以下のときは、排熱貯湯禁止運転を実行する( ステップ＃４７〜＃４９) 。
そして、フラグ１が立っていない状態で沸き上げ温度Ｔａが貯湯用目標温度Ｔｂよりも２３℃低い温度を越えていたり、フラグ１が立っている状態で沸き上げ温度Ｔａが貯湯用目標温度Ｔｂよりも６℃低い温度を越えているときは、その沸き上げ温度Ｔａに応じて循環流量を減少させる( ステップ＃５０〜＃５９) 。
【００８６】
つまり、沸き上げ温度Ｔａが貯湯用目標温度Ｔｂよりも２．５℃低い温度を越えているときは循環流量を０．１リットル/min減少させ、沸き上げ温度Ｔａが貯湯用目標温度Ｔｂよりも２．５℃低い温度以下のときであって、貯湯用目標温度Ｔｂよりも５℃低い温度以上のときは循環流量を０．２リットル/min減少させ、沸き上げ温度Ｔａが貯湯用目標温度Ｔｂよりも２．５℃低い温度以下のときであって、貯湯用目標温度Ｔｂよりも５℃低い温度未満のときは循環流量を０．３リットル/min減少させる( ステップ＃５０〜＃５４，＃５９) 。
【００８７】
また、貯湯用目標温度Ｔｂが６０℃に設定されている状態で、沸き上げ温度Ｔａが貯湯用目標温度Ｔｂよりも４℃低い温度未満の状態が１０分間継続したときや、貯湯用目標温度Ｔｂが６７℃に設定されている状態で、沸き上げ温度Ｔａが貯湯用目標温度Ｔｂよりも４℃低い温度未満の状態が１５分間継続したときは、排熱貯湯停止処理を実行する( ステップ＃５５〜＃５８) 。
【００８８】
前記排熱貯湯禁止運転は、図１４に示すように、湯水循環手段Ｅを排熱貯湯初期運転用循環状態に切り換えて、貯湯用目標温度Ｔｂよりも４．５℃低い温度を越える沸き上げ温度Ｔａが５秒間継続して検出されるまで、排熱貯湯運転用流量制御を実行し、貯湯用目標温度Ｔｂよりも４．５℃低い温度を越える沸き上げ温度Ｔａが５秒間継続して検出されると、排熱貯湯運転を実行する( ステップ＃６１〜＃６３) 。
【００８９】
〔その他の実施形態〕
１．上記実施形態では、他装置駆動機の排熱としてエンジンヒートポンプ式冷暖房装置の駆動用ガスエンジンの冷却排熱を示したが、他装置駆動機が例えば発電機の駆動用エンジンの冷却排熱や燃料電池の冷却排熱であっても良い。
２．上記実施形態では、排熱貯湯運転において、他装置駆動機の排熱があれば、目標貯湯量の設定と目標貯湯温度の設定とを変更して制御する形態を示したが、いずれか一方の設定のみを変更して制御しても良い。
【図面の簡単な説明】
【図１】貯湯式の給湯熱源装置( 貯湯ユニット) の概略構成図
【図２】貯湯式の給湯熱源装置( エンジンヒートポンプ式冷暖房装置) の概略構成図
【図３】制御ブロック図
【図４】制御動作を示すフローチャート
【図５】制御動作を示すフローチャート
【図６】制御動作を示すフローチャート
【図７】制御動作を示すフローチャート
【図８】制御動作を示すフローチャート
【図９】制御動作を示すフローチャート
【図１０】制御動作を示すフローチャート
【図１１】制御動作を示すフローチャート
【図１２】制御動作を示すフローチャート
【図１３】制御動作を示すフローチャート
【図１４】制御動作を示すフローチャート
【符号の説明】
１ 貯湯タンク
４ 加熱手段
６ 給湯路
３４ 排熱利用式加熱器
７７ 他装置駆動機
Ｃ 循環制御手段
Ｅ 湯水循環手段
Ｕ 排熱非利用式加熱器[0001]
BACKGROUND OF THE INVENTION
The present invention provides a hot water storage tank having a hot water supply channel connected to an upper portion thereof, and hot water taken out from the bottom of the hot water storage tank is heated by heating means so that the hot water is stored in the hot water storage tank while forming a temperature stratification. After that, hot water circulating means for circulating hot water in a circulating state for hot water storage operation in which the hot water is supplied to the upper part of the hot water storage tank, and hot water circulated in the circulating state for hot water storage operation are in the target hot water storage state. The present invention relates to a hot water storage type hot water supply heat source device provided with circulation control means for controlling the operation of the hot water circulation means so as to be stored in the hot water.
[0002]
[Prior art]
In the above hot water storage type hot water supply heat source device, as described in, for example, Japanese Patent Application Laid-Open No. 59-7843, a heat exchanger heated by a gas burner as a heating means is provided and taken out from the bottom of the hot water storage tank. After the hot water is heated by the heat exchanger, the hot water is circulated in the form of supplying the hot water to the upper part of the hot water storage tank, and the hot water is stored in the target hot water state by forming a temperature stratification. Yes.
[0003]
[Problems to be solved by the invention]
  The above conventional hot water storage type hot water supply heat source device uses a gas burner that burns fuel gas as a heat source for hot water storage, and therefore has the advantage of reliably storing hot water in a desired target hot water storage state, but there is a problem that the cost of hot water storage is high. .
  As a means for solving this problem, for example, exhaust heat utilization for recovering exhaust heat of other device drive units such as an engine driving a power generation device or an engine driving a compressor of a heat pump and heating hot water with the exhaust heat It is conceivable to reduce the hot water storage cost by providing a heating means that is provided with a heater and a non-exhaust heat utilization type heater that heats hot water without using the exhaust heat of another apparatus drive machine.
  However, even if hot water is heated by a waste heat utilization type heater, there is a drawback that after the hot water is stored in the target hot water storage state, even if there is exhaust heat, the exhaust heat cannot be used effectively.
  The present invention has been made in view of the above circumstances, and when there is exhaust heat from another device drive machine while ensuring that hot water can be reliably stored in a desired target hot water storage state, the exhaust heat is effectively utilized. The purpose is to be able to store hot water at a cheap hot water storage cost.
[Means for Solving the Problems]
  According to the first aspect of the present invention, a hot water storage tank having a hot water supply channel connected to an upper portion thereof, and hot water is taken out from the bottom of the hot water storage tank so that hot water is stored in the hot water storage tank while forming a temperature stratification. Hot water circulating means for circulating hot water in a circulating state for hot water storage operation in a form in which hot water is heated by a heating means and then the hot water is supplied to the upper part of the hot water storage tank;
  When a hot water storage request is issued,Hot water circulated in the circulation state for the hot water storage operationSetThe operation of the hot water circulation means is controlled so that hot water is stored in the hot water storage tank in the target hot water storage state.Execute hot water storage operationA hot water storage hot water source device provided with a circulation control means,
  The heating means uses a waste heat utilization type heater that heats hot water using the waste heat of the other device drive machine, and a waste heat non-use type heating that heats the hot water without using the waste heat of the other device drive machine. And when the circulation control means determines that there is exhaust heat from the other device drive machine when hot water is stored in the hot water storage tank in the target hot water storage state, Hot water is circulated in a circulating state for hot water storage operation where hot water is heated by a utilization type heater, and configured to execute waste heat utilization hot water storage operation control in which hot water is stored in the hot water storage tank in a hot water storage state exceeding the target hot water storage state.,
The circulation control means is configured to control operation of the hot water circulation means so that hot water of a target hot water storage amount as the target hot water storage state is stored in the hot water storage tank;
When the circulation control means determines that there is exhaust heat from the other device drive machine while hot water of the target hot water storage amount is stored in the hot water storage tank, the setting of the target hot water storage amount is invalidated, When exhaust heat-utilizing hot water storage control is performed to control so that the maximum amount of hot water is stored in the hot water storage tank, and when it is determined that there is no exhaust heat from the other device drive unit, or the maximum hot water storage amount When the hot water is stored, the target hot water storage amount is set back to the original setting.There is in point.
[Action]
  A waste heat utilization type heater in which the heating means heats hot water using the exhaust heat of the other device drive machine, and a non-exhaust heat utilization type heater that heats hot water without using the waste heat of the other device drive machine, The circulation control means heats the hot water taken out from the bottom of the hot water storage tank with an exhaust heat utilization type heater or an exhaust heat non-use type heater, and then supplies the hot water to the upper part of the hot water storage tank. Since the hot water circulating means is controlled so that hot water circulated in the circulation state for hot water storage operation is stored in the hot water storage tank in the target hot water storage state, the hot water can be reliably stored in the desired hot water storage state, Hot water storage costs can be reduced.
  In addition, if the circulation control means determines that there is exhaust heat from the drive device of the other device while hot water is stored in the hot water storage tank in the target hot water storage state, the hot water is heated by the exhaust heat utilization type heater. Since hot water is circulated in the circulating state for hot water storage operation and hot water storage operation control is performed using hot water to store hot water in the hot water storage tank when the hot water storage state exceeds the target hot water storage state, there is exhaust heat even after hot water is stored in the target hot water state. The exhaust heat can be used effectively to store hot water with low hot water storage costs.
In addition, when the circulation control means determines that there is exhaust heat from the drive device of another device while hot water of the target hot water storage amount is stored in the hot water storage tank, the target hot water storage amount setting is invalidated and waste heat is used. Hot water is circulated in a hot water storage circulation state in which hot water is heated by a hot water heater, and exhaust heat utilizing hot water storage operation control is performed to control so that the maximum amount of hot water is stored in the hot water storage tank.
〔effect〕
  While reliably storing hot water in a desired target hot water storage state, when there is exhaust heat from another device drive machine, the exhaust heat can be effectively used to store hot water at a low hot water storage cost.
Even when the target hot water storage amount is smaller than the maximum hot water storage amount, when there is exhaust heat, the hot water storage capacity of the hot water storage tank can be fully utilized to store hot water with low hot water storage costs.
[0005]
  Claim2The characteristic configuration of the invention described is configured such that the circulation control means controls the operation of the hot water circulation means so that hot water having a target temperature as the target hot water storage state is stored in the hot water storage tank with a set hot water storage amount. And when the circulation control means determines that there is exhaust heat from the other device drive machine in a state where the hot water of the target temperature is stored in the hot water storage tank at the target hot water storage amount, the target temperature is set. And the setting of the target hot water storage amount is invalidated, and exhaust heat-utilizing hot water storage operation control is performed so that hot water at a temperature exceeding the target temperature is stored in the hot water storage tank at a hot water storage amount exceeding the target hot water storage amount. The point is that it is configured to do.
[Action]
  When the circulation control means determines that there is exhaust heat from the drive device of the other device while hot water at the target temperature is stored in the hot water storage tank at the target hot water storage amount, the target temperature setting and target hot water storage amount setting are performed. The hot water is circulated in the circulation state for hot water storage operation where the hot water is heated by the waste heat utilization type heater, and hot water at a temperature exceeding the target temperature is stored in the hot water storage tank with the amount of hot water exceeding the target hot water storage amount. Exhaust heat utilization hot water storage operation control is executed.
〔effect〕
  Hot water with a temperature exceeding the target temperature can be stored in the hot water storage tank, and when there is exhaust heat, the exhaust heat can be used to the maximum to store hot water with low hot water storage costs.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
An example in which an embodiment of a hot water storage type hot water supply heat source apparatus according to the present invention is applied to an engine heat pump type air conditioning and hot water supply system will be described with reference to the drawings.
As shown in FIGS. 1 and 2, this engine heat pump type air conditioning and hot water supply system supplies hot water stored in a hot water storage tank 1 by forming a temperature stratification, or heats the hot water in the hot water storage tank 1 to the outside. It is comprised from the hot water storage unit A which radiates heat in the thermal radiation part 2, and the engine heat pump type | formula air conditioning apparatus B which cools and heats indoors.
[0007]
The hot water storage unit A includes a hot water storage unit controller C that controls the operation of the hot water storage unit A, a hot water storage tank 1, a hot water circulation means E having a circulation path 3 for circulating hot water in the hot water storage tank 1, and a circulation path 3. It comprises a heating unit 4 as a heating means for heating flowing hot water, an external heat radiating unit 2 for exchanging heat with hot water flowing through the circulation path 3 and radiating heat, and the hot water in the hot water storage tank 1 by the operation of the circulation pump P1. Is circulated in the circulation path 3 and heated by the heating unit 4 or radiated by the external heat radiating unit 2.
[0008]
The hot water storage tank 1 is connected to a hot water supply path 5 for supplying water to the hot water storage tank 1 from the bottom using tap water pressure, and is connected to a hot water supply path 6 for supplying hot water to a bathroom or kitchen from the upper part. It is configured to supply only the amount of water used in the kitchen or the like from the water supply channel 5 to the hot water storage tank 1.
Inside the hot water storage tank 1, hot water storage temperature thermistors S1, S2, S3, and S4 as four temperature sensors for detecting the temperature of the hot water in the hot water storage tank 1 are provided in a vertically distributed manner.
[0009]
The hot water supply path 6 is connected to a mixing water supply path 7 branched from the water supply path 5, and the mixing ratio of the hot water from the hot water supply path 6 and the water from the mixing water supply path 7 can be adjusted to the connection location. A mixing valve 8 is provided.
A water supply thermistor 9 for detecting the water supply temperature is provided at a branch point between the water supply passage 5 and the mixing water supply passage 7, and a check valve 10 is provided in each of the water supply passage 5 and the mixing water supply passage 7. ing.
Incidentally, an overflow passage 11 is connected to the hot water supply passage 6, and an air vent valve 12 is provided in the overflow passage 11.
[0010]
Further, on the upstream side of the mixing valve 8 in the hot water supply passage 6, a hot water storage outlet thermistor 13 for detecting the temperature of the hot water supplied to the hot water supply passage 6 from the upper part of the hot water storage tank 1 is provided, and the mixing valve 8 in the hot water supply passage 6 is provided. On the further downstream side, a mixing thermistor 14 for detecting the temperature of hot and cold water mixed by the mixing valve 8 and a hot water supply proportional valve 15 for adjusting the flow rate of hot water in the hot water supply path 6 are provided.
[0011]
The hot water supply passage 6 downstream of the hot water proportional valve 15 is branched into a general hot water supply passage 16 for supplying hot water to a hot water tap such as a kitchen or a washroom, and a hot water supply passage 17 for supplying hot water to the bathtub, A hot water supply path 17 is connected to a bath return path 18 from the bathtub, and hot water is supplied to the bathtub through both the bath return path 18 and the bath return path 19.
The general hot water supply path 16 is provided with a hot water flow rate sensor 20 that detects the flow rate of hot water flowing through the general hot water supply path 16, and the hot water supply path 17 detects the flow rate of hot water flowing through the hot water supply path 17. A hot water flow rate sensor 21, a hot water solenoid valve 22, a vacuum breaker 23, and a hot water check valve 24 are provided in this order from the upstream side.
[0012]
The circulation path 3 and the hot water storage tank 1 allow the hot water flowing through the circulation path 3 to be returned to the hot water storage tank 1, or the hot water in the hot water storage tank 1 is taken into the circulation path 3 so that the upper part 1 of the hot water storage tank 1. It is connected in communication at a total of three locations, two locations and two bottom portions.
Specifically, an upper connection path 25 that connects the circulation path 3 and the hot water storage tank 1 is connected to the upper part of the hot water storage tank 1 through the upstream side of the hot water supply path 6. A return path 26 for returning hot water flowing through the circulation path 3 to the bottom of the hot water storage tank 1 via the downstream side of the water supply path 5, and an extraction path 27 for taking out hot water at the bottom of the hot water storage tank 1 to the circulation path 3. Are connected.
[0013]
The upper connection path 25 is provided with an electromagnetic upper opening / closing valve 28, and the return path 26 is provided with a return opening / closing valve 29. By opening the upper opening / closing valve 28, the circulation path 3 is passed through. The circulating hot water is supplied to the upper part of the hot water storage tank 1, the hot water in the upper part of the hot water storage tank 1 is taken out to the circulation path 3, and the return on-off valve 29 is opened to pass through the circulation path 3. The flowing hot water can be returned to the bottom of the hot water storage tank 1.
Incidentally, a drainage passage 30 for draining hot water in the hot water storage tank 1 is connected to the extraction passage 27, and a safety valve 31 and a manual valve 32 are connected in parallel to the middle portion of the drainage passage 30. .
[0014]
The heating unit 4 supplies the refrigerant from the engine heat pump air-conditioning apparatus B to heat the hot water and the engine exhaust of the driving gas engine 77 of the engine heat pump air-conditioning apparatus B as the other device drive machine. An engine exhaust heat utilization type heater 34 that heats hot water with the engine exhaust heat using heat and an auxiliary heater 35 that heats the hot water by combustion of a burner 36 are provided.
A heat pump heater 33, an engine exhaust heat utilization heater 34, and an auxiliary heater 35 are provided in order from the upstream side in the hot water circulation direction of the circulation path 3, and the heat pump heater 33 and the auxiliary heater 35 are provided. However, the exhaust heat non-use type heater U that heats the hot water without using the exhaust heat of the other device drive 77 is configured.
[0015]
The auxiliary heater 35 is provided with a fan 37 for supplying combustion air to the gas combustion type burner 36 and the like, and is configured to heat hot water flowing through the circulation path 3 by combustion of the burner 36.
A gas supply valve 38 for supplying fuel gas to the burner 36 is provided with a gas safety valve 39, a gas proportional valve 40, and a gas main valve 41 in order from the upstream side.
[0016]
The external heat radiating unit 2 includes a heating heat exchanging unit 42 for exchanging heat between hot water flowing through the circulation path 3 and hot water as a heating medium, and hot water flowing through the circulation path 3 and hot water in the bathtub. And a bath heat exchanging portion 43 for exchanging and exchanging heat with each other.
Then, the circulation path 3 is branched into a heating circulation path 3a having a heating heat exchange section 42 and a bath circulation path 3b having a bath heat exchange section 43, and the heating heat exchange section 42 and the bath The heat exchanging unit 43 is connected in parallel.
The heating circulation path 3a is provided with an electromagnetic heating on / off valve 44 upstream of the heating heat exchange section 42 in the hot water circulation direction, and the bath circulation path 3b has a bath heat exchange. An electromagnetic bath opening / closing valve 45 is provided upstream of the portion 43 in the hot water circulation direction.
[0017]
In the heating heat exchanging unit 42, the heating heat medium circulating through the heating return path 46 and the heating outgoing path 47 is heated by hot water flowing through the circulation path 3 by operating the heating pump P2. It is configured.
The heating return path 46 is provided with a heating return thermistor 48 that detects the temperature of the heating heat medium in the heating return path 46, a makeup water tank 49, and a heating pump P 2 in order from the upstream side. Is provided with a heating thermistor 50 that detects the temperature of the heating medium in the heating path 47.
[0018]
The replenishing water tank 49 is provided with an upper limit sensor 51 for detecting the upper limit of the water level and a lower limit sensor 52 for detecting the lower limit, and a tank water supply path 53 for supplying water to the replenishing water tank 49 is connected. A supply water electromagnetic valve 54 is provided in the path 53.
In addition, a heating bypass path 55 is provided for supplying the heating medium of the heating return path 46 to the heating forward path 47 by bypassing the heating heat exchanging section 42.
[0019]
The bath heat exchanging unit 43 is configured to heat the hot water in the bathtub circulating through the bath return path 18 and the bath going-out path 19 with hot water flowing through the circulation path 3 by operating the bath pump P3. Has been.
The bath return path 18 includes, in order from the upstream side, a water level sensor 56 that detects the level of hot water in the bathtub, a bath return thermistor 57 that detects the temperature of hot water in the bath return path 18, a two-way valve 58, and a bath pump. P3 and a bath water flow switch 59 are provided.
[0020]
Between the connection point of the return path 26 and the connection point of the extraction path 27 in the circulation path 3, an electromagnetic type that intermittently flows the hot water that has passed through the external heat radiating unit 2 to the heat pump heater 33. A heat pump opening / closing valve 60 is provided, and an inlet temperature thermistor 61 for detecting the temperature of hot water flowing through the auxiliary heater 35, a circulation path between the engine exhaust heat utilization type heater 34 and the auxiliary heater 35. A circulating flow rate sensor 62 for detecting the circulating flow rate Q of hot water flowing through 3, a circulation pump P 1, and an electromagnetic auxiliary on / off valve 63 for interrupting hot water flow to the auxiliary heater 35 are provided.
[0021]
Between the auxiliary on / off valve 63 and the auxiliary heater 35 in the circulation path 3, a water amount sensor 64 for detecting the circulation flow rate Q of hot water flowing through the auxiliary heater 35 is provided. Between the connection part of the heater 35 and the upper connection path 25, the water proportional valve 65 which adjusts the circulation flow rate Q of the hot water flowing through the circulation path 3, and the circulation path after being heated by the heating unit 4 A hot water storage thermistor 66 for detecting the boiling temperature Ta of the hot water 3 is provided.
[0022]
The circulation path 3 includes a heat pump bypass path 67 for allowing hot water that has passed through the external heat radiating section 2 to bypass the heat pump heater 33 and flow into the engine exhaust heat utilization heater 34, and engine exhaust heat utilization. An auxiliary bypass path 68 for circulating hot water passing through the heater 34 bypassing the auxiliary heater 35 is connected, and an electromagnetic heat pump bypass opening / closing valve 69 is provided in the heat pump bypass path 67. The auxiliary bypass path 68 is provided with an electromagnetic auxiliary bypass opening / closing valve 70.
[0023]
Then, the hot water circulation means E includes the circulation path 3, the upper connection path 25, the return path 26, the take-out path 27, the circulation pump P1, the upper on-off valve 28, the heating on-off valve 44, the bath on-off valve 45, and the return on-off. The valve 29, the heat pump on-off valve 60, the heat pump bypass on-off valve 69, the auxiliary intermittent on-off valve 63, the auxiliary bypass on-off valve 70, and the like, and the upper on-off valve 28, the heating on-off valve 44, the bath on-off valve 45, the return The hot water extracted from the bottom of the hot water storage tank 1 is heated by the heating unit 4 by opening and closing the on-off valve 29, the heat pump on-off valve 60, the heat pump bypass on-off valve 69, the auxiliary intermittent on-off valve 63, and the auxiliary bypass on-off valve 70. After that, the hot water is circulated in the initial operation circulation state in which the hot water is returned to the bottom of the hot water storage tank 1, and the hot water is stored in the hot water storage tank 1. After the hot water extracted from the bottom of the hot water storage tank 1 is heated by the heating unit 4, the hot water is circulated for hot water storage operation in a form in which the hot water is supplied to the upper part of the hot water storage tank 1. Hot water storage operation to be circulated, hot water heated by the heating unit 4 is supplied to the external heat radiating unit 2, and the total amount of hot water that has passed through the external heat radiating unit 2 is directly returned to the heating unit 4 by bypassing the hot water storage tank 1 It can be switched to a heat radiation operation in which hot water is circulated in the circulation state for the heat radiation operation.
[0024]
The circulation adjusting means F includes a water supply thermistor 9, an inlet temperature thermistor 61, a circulation flow rate sensor 62, a water proportional valve 65, a hot water storage thermistor 66, a hot water storage temperature thermistor S1, S2, S3, S4, and the like. Is composed of a hot water storage outlet thermistor 13, a mixing valve 8, a hot water proportional valve 15, a hot water flow sensor 20, a hot water flow sensor 21, a hot water solenoid valve 22, and the like, and the bath operating means H is a water level sensor 56, a bath return. The thermistor 57, the two-way valve 58, the bath pump P3, the bath water flow switch 59, and the like are configured. The heating operation means J includes the heating return thermistor 48, the heating pump P2, the heating forward thermistor 50, and the like.
[0025]
The hot water storage unit controller C includes an upper on-off valve 28, a heating on-off valve 44, a bath on-off valve 45, a return on-off valve 29, a heat pump on-off valve 60, a heat pump bypass on-off valve 69, an auxiliary intermittent on-off valve 63, an auxiliary By controlling the opening and closing of each of the bypass on / off valves 70, hot water is circulated in the initial operation circulation state, hot water circulated in the hot water storage operation circulation state is stored in the target hot water storage state, or in the heat dissipation operation circulation state. It is configured to circulate hot water.
[0026]
The engine heat pump air conditioner B includes a plurality of indoor units 71 and an outdoor unit 72, and is configured to air-condition a plurality of air-conditioning target spaces. The indoor unit 71, the outdoor unit 72, and the hot water storage unit A The heat pump type heater 33 is connected by a refrigerant pipe 73 so that the refrigerant in the engine heat pump type air conditioner B can be supplied to the heat pump type heater 33.
Each of the plurality of indoor units 71 includes an indoor heat exchanger 75, an indoor air conditioner blower 76 that sends out the temperature-controlled air in the indoor heat exchanger 75 to the air-conditioning target space, and the like.
[0027]
The outdoor unit 72 includes electronic expansion valves 74 and 89, a gas engine 77, a refrigerant compressor 78 driven by the gas engine 77, an accumulator 79, a four-way valve 80, an outdoor heat exchanger 81, and an outdoor heat exchanger 82 thereof. Are provided with an outdoor air-conditioning blower 82, a radiator 83, a radiator blower 84, a heat pump operation control unit D, and the like.
A cooling water passage 85 for circulating cooling water for cooling the gas engine 77 to and from the radiator 83 is provided. The cooling water passage 85 detects the cooling water temperature at the radiator pump P4 and the engine outlet side. A temperature thermistor 95 is provided, and the cooling water in which the exhaust heat of the gas engine 77 is recovered is supplied to the engine exhaust heat utilization type heater 34 through the heating cooling water passage 91 and is supplied to the radiator 83 to be radiated. An exhaust heat switching mechanism 86 that can be switched to a heat radiation state is provided.
[0028]
Then, the heat pump operation means K detects the low-pressure side refrigerant pressure by the gas engine 77, the electronic expansion valves 74 and 89, the indoor air-conditioning blower 76, the refrigerant compressor 78, the four-way valve 80, the outdoor air-conditioning blower 82, and the low-pressure side refrigerant pressure. Means 87, high-pressure detection means 88 for detecting the refrigerant pressure on the high-pressure side, and the like, and the cooling water circulation means L are the cooling water passage 85, the heating cooling water passage 91, the radiator pump P4, the radiator blower 84, the exhaust heat switching mechanism. 86, a cooling water temperature thermistor 95, and the like.
[0029]
The hot water storage unit control unit C and the heat pump operation control unit D are configured to be able to transmit and receive control signals such as that the engine heat pump air conditioner B is in an air conditioning operation and a drive request to the engine heat pump air conditioner B. As shown in FIG. 3, the air conditioning operation such as the air conditioning cooling operation and the air conditioning heating operation to the air conditioning target space based on the commands of the air conditioning remote controller 93 and the hot water storage remote controller 92 installed in each room as the air conditioning target space. , Hot water storage operation to store hot water in the hot water storage tank 1, heat radiation operation to dissipate heat in the external heat radiating unit 2, hot water supply priority operation to supply hot water when the hot water storage amount in the hot water storage tank 1 is less than the minimum secured amount, etc. Is configured to run.
[0030]
The operation of the engine heat pump air conditioner B will be described. When there is an air conditioning request such as an air conditioning cooling request or an air conditioning heating request from the air conditioning remote controller 93, the heat pump operation control unit D operates the heat pump operating means K and the cooling water circulation means L. The compressor 78 is operated by the gas engine 77 based on the air-conditioning request by the air-conditioning remote controller 93, and the air-conditioning cooling operation and the air-conditioning heating operation are selectively switched by the switching operation of the four-way valve 80. The heat pump operation means K is controlled by switching the air conditioning to each air conditioning target space by opening / closing control of the valve 74.
[0031]
That is, when there is an air conditioning cooling request from the air conditioning remote controller 93, the heat pump operation control unit D opens the electronic expansion valve 74 corresponding to the room with the air conditioning cooling request, and causes the indoor heat exchanger 75 to function as an evaporator. Then, the temperature of the air supplied to the air-conditioning target space is adjusted to a cooling temperature, and the heat pump operation means K is controlled to execute the air-conditioning cooling operation so that the outdoor heat exchanger 81 functions as a condenser and dissipates heat to the outside air. .
Further, when there is an air conditioning heating request from the air conditioning remote controller 93, the heat pump operation control unit D opens the electronic expansion valve 74 corresponding to the room with the air conditioning heating request, and causes the indoor heat exchanger 75 to function as a condenser. Then, the temperature of the air supplied to the air conditioning target space is adjusted by heating, and the heat pump operation means K is controlled to execute the air conditioning heating operation so that the outdoor heat exchanger 81 functions as an evaporator and absorbs heat from the outside air.
[0032]
The heat pump operation control unit D determines the rotational speed of the refrigerant compressor 78, the detected refrigerant pressure and the set target pressure so that the refrigerant pressure becomes the set target pressure in both the air conditioning cooling operation and the air conditioning heating operation. The time constant in the control is set to be sufficiently large, and the increase / decrease / change of the rotational speed is performed at a moderate speed.
[0033]
The cooling water circulating means L can be heated by the engine exhaust heat utilizing heater 34 by operating the radiator pump P4, operating the radiator blower 84 to dissipate heat by the radiator 83 in the air conditioning cooling operation. In this case, when the cooling water flowing through the cooling water channel 85 becomes equal to or higher than the heating set temperature, the exhaust heat switching mechanism 86 is switched to the heating state so that the cooling water is supplied to the engine exhaust heat utilization type heater 34. Yes.
In the air-conditioning / heating operation, the radiator pump P4 is operated, the radiator blower 84 is operated so that the radiator 83 dissipates heat, and when the engine exhaust heat utilizing heater 34 can be heated, the heating load is When the cooling water that is small and flows through the cooling water passage 85 becomes equal to or higher than the heating set temperature, the exhaust heat switching mechanism 86 is switched to the heating state, and the cooling water is supplied to the engine exhaust heat utilization type heater 34. .
[0034]
In the air-conditioning cooling operation, the indoor heat exchanger 75 functions as an evaporator to cool and adjust the temperature of air supplied to the air-conditioning target space, and the outdoor heat exchanger 81 functions as a condenser to radiate heat to the outside air. I am doing so.
In this air conditioning cooling operation, the heat pump operation control unit D controls the rotational speed of the gas engine 77 based on the detection information of the low pressure detection means 87 so that the detected pressure becomes the target pressure for cooling. .
Further, in the air conditioning and cooling operation, the heat pump operation control unit D switches the exhaust heat switching mechanism 86 to a heating state, supplies cooling water to the engine exhaust heat utilization type heater 34, and supplies hot water flowing through the circulation path 3 to the engine. Heat is exhausted.
[0035]
The flow of the refrigerant in the air-conditioning cooling operation will be described. The high-pressure dry vapor refrigerant discharged from the refrigerant compressor 78 is supplied to the outdoor heat exchanger 81 via the four-way valve 80, and the outdoor heat exchanger 81 It is condensed by heat exchange with the outside air.
Then, the condensing process passing refrigerant sent from the outdoor heat exchanger 81 is supplied to the indoor heat exchanger 75 via the electronic expansion valve 74, and is evaporated by heat exchange with the air to be cooled in the indoor heat exchanger 75. The
Thereafter, the low-pressure dry vapor refrigerant delivered from the indoor heat exchanger 75 is returned to the suction port of the refrigerant compressor 78 via the four-way valve 80 and the accumulator 79.
[0036]
In the air-conditioning / heating operation, the indoor heat exchanger 75 functions as a condenser to heat and control the temperature of air supplied to the air-conditioning target space, and the outdoor heat exchanger 81 functions as an evaporator to absorb heat from the outside air. ing.
In this air conditioning heating operation, the heat pump operation control unit D controls the rotational speed of the gas engine 77 based on the detection information of the high pressure detection means 88 so that the detected pressure becomes the target pressure for heating. .
In this air conditioning heating operation, the hot water flowing through the circulation path 3 is heated by the heating operation for supplying the high-pressure refrigerant to the heat pump heater 33 through the heating refrigerant pipe 90.
[0037]
When the flow of the refrigerant in the air conditioning heating operation is described, initial control is performed so that the electronic expansion valves 74 and 89 have a predetermined opening degree, and the detected pressure of the high pressure detecting means 88 becomes the target pressure. The rotational speed of the gas compressor 77 is increased or decreased to control the rotational speed of the refrigerant compressor 78, and the high-pressure dry vapor refrigerant discharged from the refrigerant compressor 78 is passed through the four-way valve 80 to the indoor heat exchanger 75 and the heat pump type. The heat is supplied to the heater 33 and condensed in the indoor heat exchanger 75 by heat exchange with the air to be heated, and in the heat pump heater 33, it is condensed by heat exchange with hot water in the circulation path 3.
[0038]
The condensation process passing refrigerant sent from the indoor heat exchanger 75 is supplied to the outdoor heat exchanger 81 via the electronic expansion valve 74, and the condensation process passing refrigerant sent from the heat pump heater 33 is The refrigerant is supplied to the outdoor heat exchanger 81 through the expansion valve 89 and is evaporated by heat exchange with the outside air in the outdoor heat exchanger 81.
Thereafter, the low-pressure dry vapor refrigerant sent from the outdoor heat exchanger 81 is returned to the suction port of the refrigerant compressor 78 via the four-way valve 80 and the accumulator 79.
[0039]
After the initial control of the electronic expansion valves 74 and 89 is completed, the refrigerant temperature on the downstream side of the indoor heat exchanger 75 and the heat pump heater 33 is detected by the refrigerant temperature sensor 96, and this detected temperature is the saturated liquid. Subcool control is performed to adjust the opening degree of the electronic expansion valves 74 and 89 so that the target temperature is obtained by subtracting a predetermined value from the temperature.
That is, in the subcool control, the indoor heat exchanger 75 or the heat pump heater 33 condenses and dissipates heat, and as a result, the temperature of the cooled refrigerant is detected by the refrigerant temperature sensor 96, and the detected temperature is detected as a high pressure. The opening degree of the electronic expansion valves 74 and 89 is adjusted to be lower by a predetermined value (subcool value) than the saturated liquid temperature obtained from data stored in advance in the memory based on the detected pressure detected by the means 88. .
[0040]
Then, the higher the temperature detected by the refrigerant temperature sensor 96 with respect to the target temperature obtained by subtracting a predetermined value from the saturated liquid temperature, the smaller the degree of opening of the electronic expansion valves 74 and 89, the lower the circulation amount of the refrigerant. Accordingly, the amount of heat released per predetermined amount of refrigerant increases, the temperature detected by the refrigerant temperature sensor 96 decreases, and the pressure detected by the high-pressure detection means 88 increases to increase the saturated liquid temperature, thereby increasing the refrigerant temperature sensor. The detected temperature by 96 can be made substantially equal to the target temperature.
Further, the lower the temperature detected by the refrigerant temperature sensor 96 with respect to the target temperature, the larger the degree of opening of the electronic expansion valves 74 and 89, thereby increasing the circulation amount of the refrigerant. The amount of heat release decreases, the temperature detected by the refrigerant temperature sensor 96 rises, the pressure detected by the high-pressure detection means 88 decreases, the saturated liquid temperature decreases, and the temperature detected by the refrigerant temperature sensor 96 is substantially the target temperature. Can be equivalent.
[0041]
The hot water storage unit controller C includes a hot water storage amount detection means M for detecting the hot water storage amount R in the hot water storage tank 1, a target hot water storage amount setting means N for setting the target hot water storage amount Ra to be stored in the hot water storage tank 1, and the like. It has been.
The hot water storage amount detection means M and the target hot water storage amount setting means N are provided in a program format, and the hot water storage amount detection means M detects a temperature of the hot water storage temperature thermistors S1, S2, S3, S4 that is equal to or higher than the hot water storage setting temperature Te. Depending on which hot water storage temperature thermistor S1, S2, S3, S4 is the lowest hot water storage temperature thermistor, an amount set in advance as an amount corresponding to the detection position of the hot water storage temperature thermistors S1, S2, S3, S4. Hot water is detected as the hot water storage amount R, and the target hot water storage amount setting means N sets the hot water storage amount R corresponding to any one of the four hot water storage temperature thermistors S1, S2, S3, S4 as the target hot water storage amount Ra. Is configured to do.
[0042]
The hot water storage amount R corresponding to the uppermost hot water storage temperature thermistor S1 is the minimum secured amount Rmin, the hot water storage amount R corresponding to the second hot water storage temperature thermistor S2 is the small hot water storage amount Rs, and the third hot water storage from the top. The hot water storage amount R corresponding to the temperature thermistor S3 is preset as the intermediate hot water storage amount Rm, and the hot water storage amount R corresponding to the lowest hot water storage temperature thermistor S4 is preset as the maximum hot water storage amount Rmax.
Incidentally, in this embodiment, the minimum secured amount Rmin is set to 17 liters, the small hot water storage amount Rs is set to 30 liters, the intermediate hot water storage amount Rm is set to 70 liters, and the maximum hot water storage amount Rmax is set to 113 liters.
[0043]
Next, the operation of the hot water storage unit A will be described. Based on the request command of the hot water remote controller 92, the operating state of the heat pump operation means K, etc., the hot water storage unit controller C performs hot water circulation means E, circulation adjustment means F, hot water supply operation. The respective operations of the means G, the bath operation means H, the heating operation means J, and the auxiliary heater 35 are controlled, and the respective operations such as the hot water storage operation, the heat radiation operation, and the hot water supply priority operation are executed. Yes.
[0044]
The hot water circulating means E will be described in detail. When the hot water circulating means E stores hot water in the hot water storage tank 1, the hot water hot water circulating operation state (hereinafter referred to as the HP hot water operating operation) as the hot water circulating operation circulating state. A circulation state for the exhaust heat storage hot water operation and a circulation state for the auxiliary heat source hot water storage operation, a circulation state for the initial operation of the heat pump hot water storage (hereinafter referred to as a circulation state for the HP hot water storage initial operation), The circulation state for the initial operation of the hot water storage and the circulation state for the initial operation of the auxiliary heat source hot water storage, the circulation state for the additional operation, the circulation state for the heating operation, It is configured to be able to switch to each of the circulation states for the chasing simultaneous operation.
[0045]
When hot water is stored in the hot water storage tank 1, when the temperature of the hot water heated by the heat pump heater 33, the engine exhaust heat utilization heater 34 or the auxiliary heater 35 is less than the allowable hot water storage temperature, It is switched to the initial operation circulation state, the exhaust heat storage hot water initial operation circulation state or the auxiliary heat source hot water storage initial operation circulation state to circulate hot water in the hot water storage tank 1, and the heat pump heater 33 and engine exhaust heat utilization heater 34. Alternatively, when the temperature of the hot water heated by the auxiliary heater 35 reaches the allowable hot water storage temperature, the hot water is stored in the hot water storage tank 1 by switching to the circulation state for HP hot water storage operation, the circulation state for exhaust heat hot water storage operation, or the circulation state for auxiliary heat source hot water storage operation. Like to do.
Further, when heat is radiated by the external heat radiating unit 2, if there is a request only for the additional operation, it is switched to the circulation state for additional operation, and if there is only a request for the heating operation, the operation is switched to the circulation state for heating operation. When both the request and the heating request are received, the circuit is switched to the circulating state for simultaneous heating and reheating.
[0046]
Hereinafter, each state of the hot water circulating means E will be described.
In the description of each state of the hot water circulating means E, the upper on / off valve 28, the return on / off valve 29, the heating on / off valve 44, the bath on / off valve 45, the heat on / off valve 97, the heat pump on / off valve 60, the auxiliary As for the open / close states of the intermittent open / close valve 63, the heat pump bypass open / close valve 69, and the auxiliary bypass open / close valve 70, only the open / close valves to be opened are described, and the open / close valves not described are closed.
[0047]
In the circulation state for the HP hot water storage operation, the upper on-off valve 28 and the auxiliary bypass on-off valve 70 are opened and the circulation pump P1 is operated so that hot water forms a temperature stratification in the hot water storage tank 1 and stores hot water. After the hot water taken out from the bottom of the hot water storage tank 1 is heated by the heat pump heater 33, the hot water is bypassed the auxiliary heater 35 and returned to the upper part of the hot water storage tank 1.
[0048]
In the circulation state for the exhaust heat storage operation, the upper on-off valve 28 and the auxiliary bypass on-off valve 70 are opened, and the circulation pump P1 is operated so that hot water forms a temperature stratification in the hot water storage tank 1 and stores hot water. In addition, the hot water taken out from the bottom of the hot water storage tank 1 is heated by the engine exhaust heat utilization type heater 34, and then the hot water bypasses the auxiliary heater 35 and is returned to the upper part of the hot water storage tank 1.
[0049]
In the circulation state for the auxiliary heat source hot water storage operation, the upper on-off valve 28 and the auxiliary intermittent on-off valve 63 are opened, the circulation pump P1 is operated, and hot water forms hot water in the hot water storage tank 1 to store hot water. As described above, after the hot water taken out from the bottom of the hot water storage tank 1 is heated by the auxiliary heater 35, the hot water is returned to the upper part of the hot water storage tank 1.
[0050]
In the circulation state for the initial hot water storage operation, the return on / off valve 29, the heating on / off valve 44, and the auxiliary bypass on / off valve 70 are opened, and the circulation pump P1 is operated to supply hot water taken out from the bottom of the hot water storage tank 1. After heating by the heat pump heater 33, the hot water is bypassed the auxiliary heater 35 and returned to the bottom of the hot water storage tank 1.
[0051]
In the circulation state for the initial operation of the waste heat storage hot water, the return on / off valve 29, the heating on / off valve 44 and the auxiliary bypass on / off valve 70 are opened, and the circulation pump P1 is operated to extract hot water taken out from the bottom of the hot water storage tank 1. Is heated by the engine exhaust heat utilization type heater 34, and the hot water is bypassed the auxiliary heater 35 and returned to the bottom of the hot water storage tank 1.
[0052]
In the circulation state for the initial operation of the auxiliary heat source hot water storage, the return on / off valve 29, the heating on / off valve 44 and the auxiliary on / off valve 63 are opened and the circulation pump P1 is operated to take out from the bottom of the hot water storage tank 1. After the hot water is heated by the auxiliary heater 35, the hot water is returned to the bottom of the hot water storage tank 1.
[0053]
In the circulation state for the reheating operation, when the heat pump heater 33 is used for heating, the bath on-off valve 45, the heat pump on-off valve 60, and the auxiliary bypass on-off valve 70 are opened and the circulation pump P1 is operated. Then, the hot water heated by the heat pump heater 33 bypasses the auxiliary heater 35 and is taken out to the heat exchanger 43 for bath to dissipate the heat, and the entire amount bypasses the hot water storage tank 1 and heat pump heating When the auxiliary heater 35 is heated, the bath on / off valve 45, the auxiliary on / off valve 63 and the heat pump bypass on / off valve 69 are opened and circulated. After the pump P1 is operated and the hot water heated by the auxiliary heater 35 is dissipated in the heat exchanger 43 for bath, the entire amount is transferred to the hot water storage tank 1 and the heat pump. It bypasses the pump-type heater 33 and returns to the auxiliary heater 35 (circulation state for auxiliary heating additional operation).
[0054]
In the heating operation circulation state, the heating on-off valve 44, the auxiliary intermittent on-off valve 63, and the heat pump bypass on-off valve 69 are opened, the circulation pump P1 is operated, and hot water heated by the auxiliary heater 35 is opened. After the heat is radiated in the heat exchanging section 42 for heating, the entire amount is returned to the auxiliary heater 35 by bypassing the hot water storage tank 1 and the heat pump heater 33.
In the heating / reheating simultaneous operation circulation state, the heating on / off valve 44, the bath on / off valve 45, the auxiliary on / off valve 63 and the heat pump bypass on / off valve 69 are opened, and the circulation pump P1 is operated, After the hot water heated by the auxiliary heater 35 is dissipated by the heat exchanger 43 for bath and the heat exchanger 42 for heating, the entire amount bypasses the hot water storage tank 1 and the heat pump heater 33 and is auxiliary heated. It is made to return to the container 35.
[0055]
As operations of the hot water storage unit controller C, hot water storage operation, exhaust heat hot water storage operation, heat radiation operation, and hot water supply priority operation will be described.
The hot water storage operation is executed by selecting either a heat pump hot water storage operation (hereinafter referred to as an HP hot water storage operation) or an auxiliary heat source hot water storage operation depending on whether the engine heat pump air conditioner B is in an air conditioning heating operation or not. If there is a hot water storage request as a heating request instructed from the hot water storage remote controller 92 during the air conditioning heating operation of the heat pump type air conditioner B, the auxiliary heat source priority operation is performed by operating the auxiliary heater 35 to store the hot water. If there is a hot water storage request when the engine heat pump air conditioner B is not in the air conditioning heating operation, the HP heat storage operation is performed to store the hot water by causing the engine heat pump air conditioner B to perform the air conditioning heating operation, and the heat pump priority operation is performed. Is configured to run.
[0056]
Then, when there is a hot water storage request in a state in which the air conditioning heating request from the air conditioning remote controller 93 is canceled during the air conditioning heating operation of the engine heat pump air conditioning apparatus B, the HP hot water storage operation is continued while the operation of the engine heat pump air conditioning apparatus B is continued. Is configured to run.
In addition, if there is an air conditioning heating request to the engine heat pump air conditioner B during the HP hot water storage operation, the HP hot water storage operation is continued based on the rotational speed of the gas engine 77 or the heating load of the room where the heating is requested. It is determined whether the air conditioning capacity of the engine heat pump type air conditioner B with the air conditioning load is sufficient or insufficient with respect to the air conditioning load. When the air conditioning capacity is sufficient, the HP hot water storage operation is continued and the engine When the air conditioning operation is performed by the heat pump type air conditioner B and the air conditioning capacity is insufficient, the HP hot water storage operation is switched to the auxiliary heat source hot water storage operation and the engine heat pump type air conditioner B is operated. It is configured as follows.
[0057]
The HP hot water storage operation in the hot water storage operation will be described in detail. First, the engine heat pump air conditioner B is heated to supply high-pressure refrigerant to the heat pump heater 33, and the hot water circulation means E is used for the initial hot water storage operation. The operation is performed in a circulating state, and the hot water in the hot water storage tank 1 is heated by the heat pump heater 33.
When the temperature detected by the hot water storage thermistor 66 exceeds the hot water storage allowable temperature, the hot water circulation means E is switched from the HP hot water initial operation circulation state to the HP hot water storage operation circulation state, and hot water is stored in the upper part of the hot water storage tank 1. The opening degree of the circulation water proportional valve 65 is adjusted based on the detection information of the hot water storage thermistor 66 so that the temperature of the hot water becomes the hot water storage set temperature.
[0058]
In this way, when the hot water in the hot water storage tank 1 is stored while forming temperature stratification, and the hot water storage amount of the hot water storage tank 1 reaches the target hot water storage amount set by the hot water remote control 92 or the like, the hot water storage in the hot water storage tank 1 for a set time is performed. Then, the operation of the engine heat pump type air conditioner B is stopped, the operation of the circulation pump P1 is stopped, and the open / close valve is closed to stop the operation of the hot water circulation means E.
Incidentally, the target hot water storage amount can be selected from one of “small”, “medium”, and “full”. For example, when “medium” is selected as the target hot water storage amount, the central thermistor S3 is set at the hot water storage set temperature. If a temperature lower than the set temperature is detected, it is detected that the amount of hot water stored in the hot water storage tank 1 is equal to the target hot water storage amount.
[0059]
The auxiliary heat source hot water storage operation in the hot water storage operation will be specifically described. First, the hot water taken out from the bottom of the hot water storage tank 1 is heated by the auxiliary heater 35 after switching to the auxiliary heat source hot water storage initial operation circulation state. Switch to the auxiliary heat source hot water initial operation for circulating hot water in the form of returning hot water to the bottom of the hot water storage tank 1 and the circulation state for auxiliary heat source hot water storage operation, and hot water taken out from the bottom of the hot water storage tank 1 is heated by the auxiliary heater 35 After that, the hot water is switched to an auxiliary heat source hot water storage operation in which hot water is circulated in a form in which the hot water is supplied to the upper part of the hot water storage tank 1 to store hot water.
[0060]
That is, the hot water storage unit controller C determines that the boiling temperature Ta exceeding the temperature 8 ° C. higher than the hot water storage target temperature Tb or the boiling temperature Ta exceeding 15 ° C. lower than the hot water storage target temperature Tb is the hot water storage thermistor 66. Until the temperature is continuously detected for 1 second, the initial hot water storage operation is performed in which the hot water is circulated at a circulation flow rate of 1 liter / min in the initial operation circulation state, and the boiling temperature exceeds 8 ° C. higher than the target temperature Tb for hot water storage. When the heating temperature Ta or the boiling temperature Ta exceeding 15 ° C. lower than the hot water storage target temperature Tb is continuously detected for 1 second, the temperature is switched to the circulating state for hot water storage operation, and the boiling temperature Ta is used for hot water storage. The circulation flow rate is controlled to reach the target temperature Tb.
[0061]
In this way, when the hot water in the hot water storage tank 1 is stored while forming temperature stratification, and the hot water storage amount of the hot water storage tank 1 reaches the target hot water storage amount set by the hot water remote control 92 or the like, the hot water storage in the hot water storage tank 1 for a set time is performed. Then, the operation of the auxiliary heater 35 is stopped, the operation of the circulation pump P1 is stopped, and the open / close valve is closed to stop the operation of the hot water circulation means E.
[0062]
In the exhaust heat hot water storage operation, hot water of a preset target temperature for hot water storage is stored in the hot water storage tank 1 in the target hot water storage amount using the exhaust heat of the engine during the operation of the engine heat pump air conditioner B. Then, after switching to the circulation state for the initial operation of the waste heat storage hot water, the hot water taken out from the bottom of the hot water storage tank 1 is heated by the engine exhaust heat utilization type heater 34 and then the warm water is returned to the bottom of the hot water storage tank 1. Switching between the initial operation of waste heat storage hot water for circulating hot water and the circulation state for exhaust heat storage hot water operation, the hot water taken out from the bottom of the hot water storage tank 1 is heated by the engine exhaust heat utilizing heater 34, and then the hot water is stored. The hot water is stored by switching to an exhaust heat hot water storage operation in which hot water is circulated in a form that is supplied to the upper portion of the tank 1.
[0063]
When there is a request only for a reheating request, the heat dissipation operation performs a reheating operation, and when there is a request only for a heating request, a heating operation is performed, and when there are both a renewal request and a heating request, It is configured to perform simultaneous heating and chasing operations.
[0064]
The reheating operation in the heat radiation operation will be specifically described. The hot water circulation means E is switched to the recirculation operation circulation state, and the fan 37 is rotated so that the temperature detected by the hot water storage thermistor 66 becomes the reheating set temperature. While adjusting the speed and the opening of the gas proportional valve 40, the bath pump P3 is operated to circulate hot water in the bathtub at a constant circulation flow rate through the bath return path 18 and the bath return path 19.
Then, the hot water in the bathtub is heated and chased by the bath heat exchanging unit 43, and when the detected temperature of the bath return thermistor 57 becomes equal to or higher than the chasing temperature, the operation of the bath pump P3 is stopped. The operation of the heater 35 and the hot water circulation means E are stopped.
[0065]
The heating operation in the heat radiation operation will be specifically described. The hot water circulation means E is switched to the circulation state for heating operation, and the rotation speed and gas of the fan 37 are set so that the temperature detected by the hot water storage thermistor 66 becomes the set temperature for heating. While adjusting the opening degree of the proportional valve 40, the heating pump P2 is operated to circulate the heat medium from the heating terminal at a constant circulation flow rate through the heating return path 46 and the heating forward path 47. The heating medium is heated and supplied to the heating terminal.
[0066]
The heating and reheating simultaneous operation in the heat radiation operation will be described in detail. The hot water circulating means E is switched to the recirculation state for simultaneous heating and reheating operation, and the temperature detected by the hot water storage thermistor 66 is set for simultaneous heating and reheating. The rotational speed of the fan 37 and the opening of the gas proportional valve 40 are adjusted so as to reach the temperature, and the bath pump P3 is operated to circulate hot water in the bathtub through the bath return path 18 and the bath outlet path 19, and The heating pump P2 is operated to circulate the heat medium from the heating terminal through the heating return path 46 and the heating outgoing path 47.
And while chasing the hot water of a bathtub, the heating medium heated in the heat exchanging part 42 for heating is supplied to a heating terminal.
[0067]
The hot water supply priority operation is executed when hot water is supplied to a hot water tap or the like when the amount of hot water stored in the hot water storage tank 1 is less than the minimum ensured amount, and the hot water circulation means E is switched to the circulation state for the auxiliary heat source hot water storage operation. While the hot water heated at 35 is supplied from the upper connection path 25 to the hot water supply path 6, the temperature of the hot water to be supplied becomes the target hot water temperature based on the detection information of the hot water supply temperature, the hot water storage outlet thermistor 13 and the hot water supply thermistor 9. By adjusting the opening degree of the mixing valve 8 so as to be, and finely adjusting the opening degree of the mixing valve 8 based on the deviation between the detected temperature and the hot water supply target temperature based on the detection information of the mixing thermistor 14, Hot water at the target hot water supply temperature is supplied.
[0068]
By the way, when hot water is filled in the bathtub, similar to hot water supply priority operation, it is executed when hot water is stored in a hot water tap or the like when the amount of hot water stored in the hot water storage tank 1 is less than the minimum ensured amount. 13 and the detection information of the water supply thermistor 9, the opening of the mixing valve 8 is adjusted so that the temperature of the hot water to be supplied becomes the hot water supply target temperature, and the detection temperature and the detected temperature are determined based on the detection information of the mixing thermistor 14. While finely adjusting the opening of the mixing valve 8 based on the deviation from the hot water supply target temperature, the hot water solenoid valve 22 is opened, and the hot water adjusted to the hot water supply target temperature by the mixing bubble 8 is supplied to the bath return path 18 and Supplying to the bathtub from both sides of the bath going-out path 19 and when a set amount of hot water is supplied into the bathtub, the hot water solenoid valve 22 is closed. .
[0069]
The control operation of the hot water storage unit A will be described based on the flowcharts of FIGS.
As shown in the flowchart of FIG. 4, the hot water storage unit A executes hot water supply priority operation when the hot water storage amount of the hot water storage tank 1 is less than the minimum ensured amount and the hot water tap is opened and hot water is being supplied. If the amount of hot water stored in the hot water storage tank 1 is not less than the minimum ensured amount or not hot water is being supplied, if the hot water supply priority operation is being executed, the operation of the auxiliary heater 35 and the operation of the circulation pump P1 are stopped. Perform priority operation stop processing.
[0070]
When there is a heat release request such as a heating request or a renewal request, a heat release operation is performed, and when there is a hot water storage request, a hot water storage operation is performed, and the heat pump operation indicating that the engine heat pump air conditioner B is in operation. A signal (hereinafter referred to as an HP operation signal) is input from the heat pump operation control unit D, and the exhaust heat 60 ° C signal indicating that the coolant temperature of the engine exhaust heat is 60 ° C or higher, or the engine exhaust heat An exhaust heat 70 ° C. signal indicating that the cooling water temperature is 70 ° C. or higher is input from the heat pump operation control unit D, and the temperature Tg detected by the lowermost hot water storage temperature thermistor S4 in the hot water storage tank 1 is less than 60 ° C. When the exhaust heat storage operation is performed.
[0071]
When the control operation of the heat radiation operation is described based on the flowchart of FIG. 5, the hot water storage amount of the hot water storage tank 1 is less than the minimum ensured amount, and the hot water tap is opened and hot water is being supplied. Execute hot water supply priority operation.
If the amount of hot water stored in the hot water storage tank 1 is equal to or greater than the minimum ensured amount or if hot water is not being supplied, if the hot water supply priority operation is executed, the operation of the auxiliary heater 35 and the operation of the circulation pump P1 are stopped and the hot water supply priority operation Execute stop processing.
[0072]
When there is a renewal request and there is no heating request, a renewal operation is executed. When there are both a renewal request and a heating request, a simultaneous heating and renewal operation is performed, and there is no renewal request. When there is a heating request, the heating operation is executed.
In this way, depending on whether one or both of the renewal request and the heating request is requested, each of the renewal operation, the heating operation, and the simultaneous heating and renewal operation is executed in order to satisfy the request. When either or both of the follow-up request and the heating request are satisfied and the request is completed, a heat radiation stop process for stopping the operation of the hot water circulating means E and the auxiliary heater 35 is executed.
[0073]
When the control operation of the hot water storage operation is described based on the flowchart of FIG. 6, when the hot water storage amount of the hot water storage tank 1 is less than the minimum ensured amount and the hot water tap is opened and hot water is being supplied, Execute hot water supply priority operation.
If the amount of hot water stored in the hot water storage tank 1 is equal to or greater than the minimum ensured amount or if hot water is not being supplied, if the hot water supply priority operation is executed, the operation of the auxiliary heater 35 and the operation of the circulation pump P1 are stopped and the hot water supply priority operation Execute stop processing.
And if there exists any heat dissipation request | requirement of a requisition request | requirement or a heating request | requirement, a heat dissipation operation will be performed, and when there is no heat dissipation request | requirement, HP hot water storage operation will be performed.
[0074]
In this way, when the hot water storage amount in the hot water storage tank 1 reaches the target hot water storage amount in either the HP hot water storage operation or the auxiliary heat source hot water storage operation, the hot water storage in the hot water storage tank 1 is continued for a set time, and then the engine heat pump type air conditioner B Alternatively, the operation of the auxiliary heater 35 is stopped, and the hot water storage operation stop process is executed to stop the operation of the hot water circulation means E by stopping the operation of the circulation pump P1 and closing the open / close valve.
[0075]
The control operation of the exhaust heat hot water storage operation will be described with reference to the flowcharts of FIGS.
In the exhaust heat hot water storage operation, as shown in FIG. 7, the hot water circulating means E is switched to the exhaust heat hot water storage initial operation circulation state, and the hot water taken out from the bottom of the hot water storage tank 1 is supplied to the engine exhaust heat utilizing heater 34. After the hot water is heated and then the hot water is circulated in such a manner that the hot water is circulated back to the bottom of the hot water storage tank 1, the hot water storage means E is switched to the exhaust heat hot water storage circulation state. After the hot water taken out from the bottom of the hot water is heated by the engine exhaust heat utilization type heater 34, the hot water is circulated in a form in which the hot water is supplied to the upper part of the hot water storage tank 1, and the target temperature for hot water storage (in this embodiment, The exhaust heat hot water storage operation of storing hot water of Tb with the target hot water storage amount is executed (60 ° C. or 67 ° C. is set in advance).
[0076]
The exhaust heat hot water storage initial operation will be described.
In the operation control by the exhaust heat storage hot water initial operation, as shown in FIG. 8, the timer 94 is reset, the hot water circulation means E is switched to the circulation state for the exhaust heat storage hot water initial operation, and the circulation pump P1 is operated. Is adjusted to the initial target flow rate (1 liter / min), and the water proportional valve 65 is controlled so that the hot water taken out from the bottom of the hot water storage tank 1 is heated by the engine exhaust heat heater 34 and then supplemented. The heating temperature Ta exceeding the temperature 20 ° C. lower than the hot water storage target temperature Tb is continued for 5 seconds by the hot water storage thermistor 66 in the form of returning to the bottom of the hot water storage tank 1 through the bypass path 68 and the heating circulation path 3a. The circulation path 3 is circulated until it is detected (steps # 1 to # 4).
[0077]
And when the hot water storage target temperature Tb is 60 ° C., when the boiling temperature Ta below 4 ° C. lower than the hot water storage target temperature Tb is detected continuously for 10 minutes, the exhaust heat hot water storage stop processing is executed. When the hot water storage target temperature Tb is 67 ° C., the exhaust heat hot water storage stop process is executed when the boiling temperature Ta below 4 ° C. lower than the hot water storage target temperature Tb is continuously detected for 15 minutes (step #). 5- # 10).
[0078]
As shown in FIG. 9, when the circulating pump P1 is operating, the exhaust heat hot water stop processing is stopped, the timer 94 is reset, and when the accumulated time of the timer 94 reaches 30 minutes, Returning to the operation control by the initial hot water storage operation (steps # 11 to # 14).
[0079]
The exhaust heat hot water storage operation will be described.
In the operation control by the exhaust heat hot water storage operation, as shown in FIGS. 10 and 11, the timer 94 is reset, the hot water circulation means E is switched to the circulation state for the exhaust heat hot water operation, and the boiling temperature Ta is the target for hot water storage. When the temperature exceeds 4.5 ° C. lower than the temperature Tb, the flag 1 is set, and the exhaust heat hot water storage flow control is performed until the hot water at the hot water storage target temperature Tb is stored at the target hot water storage amount (step # 21- # 26).
[0080]
And in the state where the hot water of the hot water storage target temperature Tb is stored in the target hot water storage amount, whether the HP operation signal is input from the heat pump operation control unit D, the exhaust heat 60 ° C. signal, or the exhaust heat 70 It is determined whether or not the ° C signal is input from the heat pump operation control unit D, and the HP operation signal and the exhaust heat 60 ° C signal or the exhaust heat 70 ° C signal are input, and the hot water storage tank 1 is in the target hot water storage state. When it is determined that there is exhaust heat from the gas engine 77 while hot water is stored (steps # 26 to # 28), the exhaust heat storage hot water circulation is performed by heating the hot water with the engine exhaust heat utilization type heater 34. Then, hot water is circulated in the state, and exhaust heat-utilizing hot water storage operation control for storing hot water in the hot water storage tank 1 in a hot water storage state exceeding the target hot water storage state is executed (steps # 29 to # 32).
[0081]
That is, if it is determined that there is exhaust heat from the gas engine 77 in the state where the hot water at the target temperature Tb for hot water storage is stored at the target hot water storage amount, if the target hot water storage amount is not set to the maximum hot water storage amount, The target hot water storage amount setting is invalidated, the target hot water storage amount setting is changed to the maximum hot water storage amount, and the flag 2 is set, and the hot water at the hot water storage target temperature Tb is discharged until the hot water storage is stored in the hot water storage tank 1 at the maximum hot water storage amount. The flow control for the hot water storage operation is executed (steps # 29 and # 30).
[0082]
In addition, when the target hot water storage amount is set to the maximum hot water storage amount and the hot water storage target temperature Tb is set to 60 ° C., the setting of the hot water storage target temperature Tb (60 ° C.) is invalidated. The hot water storage target temperature Tb is set to 67 ° C. and the flag 3 is set so that hot water having a temperature exceeding the hot water storage target temperature Tb is stored in the hot water storage tank 1. Until the hot water is stored in the hot water storage tank 1 with the hot water storage amount, the flow control for the exhaust heat hot water storage operation is executed (steps # 31 and # 32).
[0083]
Therefore, when the original setting of the target temperature Tb for hot water storage is 60 ° C. and the original setting of the target hot water storage amount is not the maximum hot water storage amount, the hot water having a temperature exceeding the original target temperature for hot water storage Tb is the original target hot water storage. Hot water will be stored in excess of the amount.
When it is determined that there is no exhaust heat from the gas engine 77, or when the maximum amount of hot water is stored while the target temperature Tb for hot water storage is set to 67 ° C., the target hot water storage amount is set. If it has been changed, the setting of the target hot water storage amount is returned to the original setting, and if the setting of the target temperature Tb for hot water storage is changed, the setting of the target temperature Tb for hot water storage is set to the original 60 ° C. (Steps # 33 to # 36).
[0084]
The flow control for the exhaust heat storage hot water operation will be described with reference to FIGS.
In the exhaust heat hot water storage operation flow rate control, the boiling temperature Ta detected by the hot water storage thermistor 66 is not less than 1 ° C. lower than the hot water storage target temperature Tb and not higher than 1 ° C. higher than the hot water storage target temperature Tb. When the temperature is within the target temperature range for hot water, the circulating flow rate is maintained at the current level. When the boiling temperature Ta exceeds the temperature within the target temperature range for hot water storage, the boiling temperature Ta is the target temperature Tb for hot water storage. If the temperature is less than 2.5 ° C., the circulating flow rate is increased by 0.1 liter / min, and even if the boiling temperature Ta is 2.5 ° C. higher than the target temperature Tb for hot water storage, If the temperature is lower than the target temperature Tb by 5 ° C., the circulation flow rate is increased by 0.1 liter / min. If the boiling temperature Ta exceeds the temperature 5 ° C. higher than the target temperature Tb for hot water storage, circulation Flow rate 0.2 liter / min It is pressurized (Step # 41 to # 46).
[0085]
Further, when the boiling temperature Ta is lower than the temperature in the hot water storage target temperature range, the boiling temperature Ta is 23 ° C. lower than the hot water storage target temperature Tb in a state where the flag 1 is not set, When the boiling temperature Ta is not more than 6 ° C. lower than the hot water storage target temperature Tb while the flag 1 is standing, the exhaust heat hot water prohibition operation is executed (steps # 47 to # 49).
The boiling temperature Ta exceeds 23 ° C. lower than the hot water storage target temperature Tb when the flag 1 is not set, or the boiling temperature Ta is higher than the hot water storage target temperature Tb when the flag 1 is set. If the temperature exceeds 6 ° C., the circulating flow rate is decreased according to the boiling temperature Ta (steps # 50 to # 59).
[0086]
That is, when the boiling temperature Ta exceeds a temperature lower by 2.5 ° C. than the hot water storage target temperature Tb, the circulating flow rate is reduced by 0.1 liter / min, and the boiling temperature Ta is higher than the hot water storage target temperature Tb. When the temperature is lower than 2.5 ° C., and when the temperature is 5 ° C. lower than the target temperature Tb for hot water storage, the circulating flow rate is reduced by 0.2 liter / min, and the boiling temperature Ta becomes the target temperature Tb for hot water storage Tb. When the temperature is lower than the temperature lower by 2.5 ° C. than the target temperature Tb for hot water storage and lower than 5 ° C., the circulating flow rate is reduced by 0.3 liter / min (steps # 50 to # 54, # 59).
[0087]
Further, when the hot water storage target temperature Tb is set to 60 ° C. and the boiling temperature Ta is less than 4 ° C. lower than the hot water storage target temperature Tb for 10 minutes, or the hot water storage target temperature Tb Is set to 67 ° C., and when the boiling temperature Ta is lower than the hot water storage target temperature Tb by less than 4 ° C. for 15 minutes, exhaust heat hot water storage stop processing is executed (step # 55). ~ # 58).
[0088]
As shown in FIG. 14, in the exhaust heat storage prohibition operation, the hot water circulation means E is switched to the exhaust heat storage initial operation circulation state, and the boiling temperature exceeds 4.5 ° C. lower than the hot water storage target temperature Tb. Until the Ta is continuously detected for 5 seconds, the exhaust heat storage hot water flow control is executed, and the boiling temperature Ta exceeding 4.5 ° C. lower than the hot water storage target temperature Tb is continuously detected for 5 seconds. Then, the exhaust heat hot water storage operation is executed (steps # 61 to # 63).
[0089]
[Other Embodiments]
1. In the above-described embodiment, the cooling exhaust heat of the driving gas engine of the engine heat pump type air conditioner is shown as the exhaust heat of the other device drive machine. It may be cooling exhaust heat of the battery.
2. In the above-described embodiment, in the exhaust heat hot water storage operation, if there is exhaust heat from another device drive machine, the configuration is shown in which the setting of the target hot water storage amount and the setting of the target hot water temperature are changed and controlled. Only the setting may be changed and controlled.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a hot water storage type hot water supply heat source device (hot water storage unit).
FIG. 2 is a schematic configuration diagram of a hot water storage type hot water supply heat source device (engine heat pump type air conditioner).
FIG. 3 is a control block diagram.
FIG. 4 is a flowchart showing a control operation.
FIG. 5 is a flowchart showing a control operation.
FIG. 6 is a flowchart showing a control operation.
FIG. 7 is a flowchart showing a control operation.
FIG. 8 is a flowchart showing a control operation.
FIG. 9 is a flowchart showing a control operation.
FIG. 10 is a flowchart showing a control operation.
FIG. 11 is a flowchart showing a control operation.
FIG. 12 is a flowchart showing a control operation.
FIG. 13 is a flowchart showing a control operation.
FIG. 14 is a flowchart showing a control operation.
[Explanation of symbols]
1 Hot water storage tank
4 Heating means
6 Hot water supply path
34 Waste heat utilization type heater
77 Other device drive
C Circulation control means
E Hot water circulation means
U Waste heat non-use type heater

Claims (2)

給湯路が上部に接続された貯湯タンクと、
前記貯湯タンク内に湯水が温度成層を形成して貯湯されるように、前記貯湯タンクの底部から取り出した湯水を加熱手段にて加熱したのち、その温水を前記貯湯タンクの上部に供給する形態の貯湯運転用循環状態で湯水を循環させる湯水循環手段と、
貯湯要求が指令されると、前記貯湯運転用循環状態で循環させた湯水が設定された目標貯湯状態で前記貯湯タンクに貯湯されるように前記湯水循環手段の運転を制御する貯湯運転を実行する循環制御手段とが設けられた貯湯式の給湯熱源装置であって、
前記加熱手段が、他装置駆動機の排熱を利用して湯水を加熱する排熱利用式加熱器と、前記他装置駆動機の排熱を利用しないで湯水を加熱する排熱非利用式加熱器とを設けて構成され、
前記循環制御手段が、前記貯湯タンクに前記目標貯湯状態で湯水が貯湯されている状態で前記他装置駆動機の排熱が有ると判定したときは、前記排熱利用式加熱器にて湯水を加熱する貯湯運転用循環状態で湯水を循環させて、前記目標貯湯状態を越える貯湯状態で前記貯湯タンクに貯湯する排熱利用貯湯運転制御を実行するように構成され、
前記循環制御手段が、前記目標貯湯状態としての目標貯湯量の湯水が前記貯湯タンクに貯湯されるように前記湯水循環手段の運転を制御するように構成され、
前記循環制御手段が、前記目標貯湯量の湯水が前記貯湯タンクに貯湯されている状態で前記他装置駆動機の排熱が有ると判定したときは、前記目標貯湯量の設定を無効にして、最大貯湯量の湯水が前記貯湯タンクに貯湯されるように制御する排熱利用貯湯運転制御を実行し、かつ、前記他装置駆動機の排熱が無いと判定したとき、又は、前記最大貯湯量の湯水が貯湯されているときは、前記目標貯湯量の設定を元に戻すように構成されている貯湯式の給湯熱源装置。A hot water storage tank with a hot water supply channel connected to the top;
The hot water taken out from the bottom of the hot water storage tank is heated by heating means so that the hot water is stored in the hot water tank by forming a temperature stratification, and then the hot water is supplied to the upper part of the hot water storage tank. Hot water circulation means for circulating hot water in a circulating state for hot water storage operation;
When a hot water storage request is instructed , a hot water storage operation is performed to control the operation of the hot water circulation means so that hot water circulated in the hot water storage operation circulation state is stored in the hot water storage tank in a set target hot water state. A hot water storage type hot water supply heat source device provided with a circulation control means,
The heating means uses a waste heat utilization type heater that heats hot water using the waste heat of the other device drive machine, and a waste heat non-use type heating that heats the hot water without using the waste heat of the other device drive machine. And is configured with
When the circulation control means determines that there is exhaust heat from the other device drive machine while hot water is stored in the hot water storage tank in the target hot water storage state, hot water is supplied by the exhaust heat utilization type heater. It is configured to execute hot water use hot water storage operation control in which hot water is circulated in a hot water storage operation circulation state to be heated and stored in the hot water storage tank in a hot water storage state exceeding the target hot water storage state ,
The circulation control means is configured to control operation of the hot water circulation means so that hot water of a target hot water storage amount as the target hot water storage state is stored in the hot water storage tank;
When the circulation control means determines that there is exhaust heat from the other device drive machine while hot water of the target hot water storage amount is stored in the hot water storage tank, the setting of the target hot water storage amount is invalidated, When exhaust heat-utilizing hot water storage control is performed to control so that the maximum amount of hot water is stored in the hot water storage tank, and when it is determined that there is no exhaust heat from the other device drive unit, or the maximum hot water storage amount A hot water storage type hot water supply heat source apparatus configured to restore the setting of the target hot water storage amount when hot water is stored . 前記循環制御手段が、前記目標貯湯状態としての目標温度の湯水が設定貯湯量で前記貯湯タンクに貯湯されるように前記湯水循環手段の運転を制御するように構成され、
前記循環制御手段が、前記目標温度の湯水が前記目標貯湯量で前記貯湯タンクに貯湯されている状態で前記他装置駆動機の排熱が有ると判定したときは、前記目標温度の設定と前記目標貯湯量の設定とを無効にして、前記目標温度を越える温度の湯水が前記目標貯湯量を越える貯湯量で前記貯湯タンクに貯湯されるように制御する排熱利用貯湯運転制御を実行するように構成されている請求項１記載の貯湯式の給湯熱源装置。The circulation control means is configured to control the operation of the hot water circulation means so that hot water of a target temperature as the target hot water storage state is stored in the hot water storage tank at a set hot water storage amount,
When the circulation control means determines that there is exhaust heat of the other device drive machine in a state where hot water of the target temperature is stored in the hot water storage tank with the target hot water storage amount, the setting of the target temperature and the The setting of the target hot water storage amount is invalidated, and the hot water using the exhaust heat control is executed so that hot water having a temperature exceeding the target temperature is stored in the hot water storage tank with the hot water storage amount exceeding the target hot water storage amount. The hot water storage type hot water supply heat source device according to claim 1, which is configured as follows.
JP2000110166A 2000-04-12 2000-04-12 Hot water storage hot water source Expired - Fee Related JP4194212B2 (en)

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