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JP3876196B2 - Hot water system - Google Patents
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JP3876196B2 - Hot water system - Google Patents

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Publication number
JP3876196B2
JP3876196B2 JP2002198602A JP2002198602A JP3876196B2 JP 3876196 B2 JP3876196 B2 JP 3876196B2 JP 2002198602 A JP2002198602 A JP 2002198602A JP 2002198602 A JP2002198602 A JP 2002198602A JP 3876196 B2 JP3876196 B2 JP 3876196B2
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Japan
Prior art keywords
hot water
temperature
bathtub
control valve
preheated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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JP2002198602A
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Japanese (ja)
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JP2004037052A (en
Inventor
賢謙 久保谷
宏和 桑原
嘉史 跡部
浩之 多田
利彦 大林
富雄 三宅
哲司 森田
裕一 村瀬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osaka Gas Co Ltd
Noritz Corp
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Osaka Gas Co Ltd
Noritz Corp
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Priority to JP2002198602A priority Critical patent/JP3876196B2/en
Publication of JP2004037052A publication Critical patent/JP2004037052A/en
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  • Heat-Pump Type And Storage Water Heaters (AREA)

Description

【0001】
【発明の属する技術分野】
この発明は、浴槽への自動お湯張り機能を有する給湯器が、太陽熱等の補助熱源によって生成された予熱温水を利用して給湯を行う給湯システムに関する。
【0002】
【従来の技術】
補助熱源を利用した給湯システムとしては、例えば、補助熱源である太陽熱を利用して生成された予熱温水を貯留する蓄熱槽を備えている太陽熱利用温水器と、浴槽へ自動注湯を行った後、必要に応じて追い焚きを行うことによって、風呂設定温度の温水を浴槽に貯留する浴槽への自動お湯張り機能を備えている給湯器とを組み合わせた給湯システムが従来から知られている。
【0003】
こういった給湯システムでは、太陽熱利用温水器の蓄熱槽と給湯器の熱交換器とが接続されており、給湯時や浴槽への自動お湯張り時には、太陽熱利用温水器の蓄熱槽に貯留された予熱温水が給湯器の熱交換器に送出されるが、蓄熱槽に貯留された予熱温水を単に熱交換器に送出するだけではなく、必要に応じて、蓄熱槽から送出される予熱温水に低温水(常水温の水道水または予熱温水より低い温度の水)を混合した状態で、熱交換器に送出することができるように、給湯器には、熱交換器の上流側に、蓄熱槽から送出される予熱温水と低温水とを任意の混合比率で混合するための混合調節弁が搭載されている。
【0004】
従って、自動お湯張りモードで浴槽へのお湯張りを行う際、給湯器に対して設定された風呂設定温度以上の予熱温水が蓄熱槽に貯留されている場合は、給湯器の混合調節弁が、蓄熱槽から送出される風呂設定温度以上の予熱温水と低温水とを適宜混合することによって風呂設定温度の温水を生成し、熱交換器を加熱するバーナーを燃焼させることなく、浴槽への自動注湯が行われることになり、風呂設定温度以上の予熱温水が蓄熱槽に貯留されていない場合は、給湯器の混合調節弁が、蓄熱槽から送出される風呂設定温度を下回る予熱温水と低温水とを適宜混合することによって、風呂設定温度より低い予め定められた所定温度の温水を熱交換器に送出しながら、熱交換器を加熱するバーナーを燃焼させることによって風呂設定温度の温水を生成し、これを浴槽に自動注湯することになる。
【0005】
【発明が解決しようとする課題】
しかしながら、上述した従来の給湯システムでは、蓄熱槽に貯留されている予熱温水の温度が風呂設定温度より僅かに低いような場合であっても、給湯器が風呂設定温度の温水を確実に生成するために、混合調節弁が蓄熱槽から送出される予熱温水を所定温度まで一旦下げなければならないので、その後の加熱に要する給湯器の燃料消費量が必要以上に大きくなり、蓄熱槽に貯留された予熱温水を有効に利用して浴槽への自動お湯張りを行うことができないという問題があった。
【0006】
そこで、この発明の課題は、補助熱源によって生成された予熱温水を有効に利用して浴槽への自動お湯張りを行うことができる給湯システムを提供することにある。
【0007】
【課題を解決するための手段及びその効果】
上記の課題を解決するため、請求項1にかかる発明は、浴槽へ自動注湯を行った後、必要に応じて追い焚きを行うことによって、風呂設定温度の温水を浴槽に貯留する自動お湯張り機能を有する給湯器と、補助熱源によって生成された予熱温水に、必要に応じて低温水を混合して前記給湯器の熱交換器に送出する混合調節弁とを備え、浴槽への自動お湯張りを行う際に、風呂設定温度以上の予熱温水が前記混合調節弁に送出される場合は、前記混合調節弁が低温水を混合することによって風呂設定温度の温水を生成し、これを浴槽に自動注湯するようになっている給湯システムにおいて、浴槽への自動お湯張りを行う際に、風呂設定温度を下回る予熱温水が前記混合調節弁に送出される場合であって、前記混合調節弁に送出される予熱温水が風呂設定温度より低い予め定められた基準温度を下回っている場合は、前記混合調節弁が低温水を混合することによって基準温度より低い予め定められた所定温度の温水を前記給湯器の熱交換器に送出し、この所定温度の温水を前記給湯器の熱交換器が加熱することによって、風呂設定温度の温水を生成し、これを浴槽に自動注湯するが、前記混合調節弁に送出される予熱温水が前記基準温度以上の場合は、風呂設定温度を下回る予熱温水をそのままの状態で浴槽に自動注湯するようになっていることを特徴とする給湯システムを提供するものである。
【0008】
以上のように、この給湯システムでは、浴槽への自動お湯張りを行う際に、前記混合調節弁に送出される予熱温水が、風呂設定温度より低いが、基準温度以上の場合は、風呂設定温度を下回る予熱温水をそのままの状態で浴槽に注湯した後、浴槽に注湯された温水が風呂設定温度になるように、給湯器が追い焚きを行うことになるので、補助熱源によって生成された予熱温水の温度が風呂設定温度より僅かに低いような場合であっても、補助熱源によって生成された予熱温水を予め定められている所定温度まで一旦下げた後、給湯器で加熱することによって風呂設定温度の温水を生成し、これを浴槽に自動注湯するようになっている従来の給湯システムに比べて、給湯器の燃料消費量を抑えることができ、補助熱源によって生成された予熱温水を有効に利用して浴槽への自動お湯張りを行うことが可能となる。
【0009】
これに対して、前記混合調節弁に送出される予熱温水が、基準温度を下回っている場合は、前記混合調節弁が低温水を混合することによって基準温度より低い予め定められた所定温度の温水を前記給湯器の熱交換器に送出し、この所定温度の温水を前記給湯器の熱交換器が加熱することによって、風呂設定温度の温水を生成し、これを浴槽に自動注湯するようになっているので、自動注湯後の追焚時間が極端に長くなることがなく自動お湯張りに要する時間を抑えつつ、補助熱源によって生成された予熱温水を有効に利用した自動お湯張りを行うことができる。
【0010】
また、請求項にかかる発明の給湯システムのように、浴槽への自動お湯張りを行う際に、風呂設定温度を下回る予熱温水が前記混合調節弁に送出される場合は、前記混合調節弁が低温水を混合することによって風呂設定温度より低い予め定められた所定温度の温水を前記給湯器の熱交換器に送出し、この所定温度の温水を前記給湯器の熱交換器が加熱することによって、風呂設定温度の温水を生成し、これを浴槽に自動注湯する設定温度注湯モードを備え、必要に応じて、前記設定温度注湯モードに切り換えて、浴槽への自動お湯張りを行うことができるようにしておくと、すぐに入浴したいような場合は、設定温度注湯モードに切り換えて浴槽への自動お湯張りを行うと、最短時間で自動お湯張りが完了するので、使い勝手が向上する。
【0011】
【発明の実施の形態】
以下、実施の形態について図面を参照して説明する。図1は、補助熱源である太陽熱によって生成された予熱温水を利用した給湯システム1の概略構成を示している。この給湯システム1は、同図に示すように、太陽熱利用温水器10と給湯器20とが接続されたものであり、太陽熱利用温水器10によって生成された予熱温水が給湯器20に送出されるようになっている。
【0012】
前記太陽熱利用温水器10は、ソーラー集熱器11と密閉式の蓄熱槽14とを備えており、蓄熱槽14には、その下端部に低温水を供給するための給水管15が接続されていると共に、上端部には貯留された予熱温水を給湯器20に送出するための予熱温水供給管16が接続されている。
【0013】
前記ソーラー集熱器11には、その入口側と出口側とを接続するソーラー配管12によって熱媒体の循環経路が形成されており、このソーラー配管12は、部分的に蓄熱槽14内に導入された熱交換部13を有している。従って、ソーラー集熱器11によって加熱された熱媒体は、ソーラー配管12を通って蓄熱槽14内に導かれ、熱交換部13で蓄熱槽14内の水と熱交換を行うことで、蓄熱槽14内に予熱温水が生成されるようになっている。
【0014】
前記給湯器20は、浴槽への自動お湯張り機能を有しており、自動お湯張りモードで浴槽へのお湯張りを開始すると、所定水位または所定量のお湯が浴槽に貯留されるまで自動的に注湯が行われ、注湯が完了した時点で、浴槽内の湯温が風呂設定温度tbeを下回っている場合は、浴槽内の湯温が風呂設定温度tbeになるまで自動的に追い焚きが行われるようになっている。
【0015】
この給湯器20は、給水管17を介して供給される低温水と、蓄熱槽14から予熱温水供給管16を介して供給される予熱温水とを、必要に応じて混合する混合調節弁21と、混合調節弁21の出口側に接続された、混合調節弁21から送出される温水を必要に応じて加熱する熱交換器22を有するメイン流路23と、熱交換器22をバイパスするように、メイン流路23に接続されたバイパス流路24とを備えており、バイパス流路24には、熱交換器22から送出される高温の温水に、混合調節弁21から送出される比較的低温の温水を適宜混合することによって給湯設定温度tseや風呂設定温度tbeの温水を生成するためのバイパス弁25が設置されている。
【0016】
また、給水管17及び混合調節弁21の温水出口側に接続されたメイン流路23には、混合調節弁21をバイパスするバイパス管26が接続されており、このバイパス管26には、通電状態でバイパス管26の流路を遮断するダイヤフラム方式の電磁弁26aが設置されている。
【0017】
また、混合調節弁21に接続された予熱温水供給管16、メイン流路23におけるバイパス管26の接続部の上流側及び熱交換器22とバイパス流路24の下流側接続部との間には、蓄熱槽14から送出される予熱温水の温度(予熱温水温度)tpを検出するための予熱温水温度センサ27、混合調節弁21から送出される温水の温度(混合温水温度)tmを検出するための混合温水温度センサ28及び熱交換器22の出口温水温度を、熱交換器22自体の温度(熱交換器温度)tcとして検出する熱交換器温度センサ29がそれぞれ設置されている。
【0018】
また、給湯器20には、シリアルインターフェースを介して、操作リモコン30のコントローラ30aとの間で通信可能なコントローラ20aが搭載されており、これらのコントローラ20a、30aが相互に連携をとりながら、給湯器20の運転動作を統括的に制御している。
【0019】
前記コントローラ20aには、予熱温水温度センサ27、混合温水温度センサ28及び熱交換器温度センサ29からの温度検出信号が入力されると共に、操作リモコン30によって設定された給湯設定温度tse、風呂設定温度tbeや運転スイッチ信号等が操作リモコン30のコントローラ30aから送信されるようになっており、これらの温度検出信号及び給湯設定温度tseまたは風呂設定温度tbe等に基づいて、コントローラ20aが混合調節弁21、バイパス弁25及び熱交換器22を加熱するバーナー(図示せず)を制御するようになっている。
【0020】
まず、給湯を行う際、または、自動お湯張りモードで浴槽へのお湯張りを行う際に、蓄熱槽14から送出される予熱温水の温度、即ち、予熱温水温度センサ27によって検出された予熱温水温度tpが給湯設定温度tseまたは風呂設定温度tbe以上の場合は、給湯器20のバーナーを燃焼させなくても、低温水を適宜混合することによって給湯設定温度tseまたは風呂設定温度tbeの温水を供給することができるので、混合調節弁21から送出される温水の温度、即ち、混合温水温度センサ28によって検出される混合温水温度tmが給湯設定温度tseまたは風呂設定温度tbeになるように、混合調節弁21の開度を調整する設定温度制御を行うようになっている。従って、自動お湯張りモードで浴槽へのお湯張りを行う場合は、給湯器20のバーナーが燃焼することなく、風呂設定温度tbeの温水が浴槽に自動注湯されることになる。
【0021】
これに対して、給湯を行う際、または、自動お湯張りモードで浴槽へのお湯張りを行う際に、予熱温水温度tpが給湯設定温度tseまたは風呂設定温度tbeを下回っている場合は、以下に示すように、通常の給湯を行う場合と、自動お湯張りモードで浴槽へのお湯張りを行う場合とで、混合調節弁21が異なる制御を行うようになっている。
【0022】
まず、給湯を行う際に、予熱温水温度tpが給湯設定温度tseを下回っている場合は、給湯器20のバーナーを燃焼させなければ、給湯設定温度tseの温水を供給することができないので、給湯器20のバーナーを燃焼させることによって、確実に給湯設定温度tseの温水を生成することができるように、予め定められた所定温度(以下、固定温度という。)tsf(給湯設定温度tse−10℃)の温水がそれぞれ熱交換器22に送出されるように、混合調節弁21の開度を調整して低温水を混合する固定温度制御を行うようになっている。
【0023】
一方、自動お湯張りモードで浴槽へのお湯張りを行う際に、予熱温水温度tpが風呂設定温度tbeを下回っている場合は、以下に示すように、予熱温水温度tpが、風呂設定温度tbeと固定温度tbf(風呂設定温度tbe−10℃)との間に設定された基準温度tps(例えば、風呂設定温度tbe−6℃)以上であるか否かによって、異なる注湯動作を実行することになる。
【0024】
まず、予熱温水温度tpが、基準温度tps以上の場合は、蓄熱槽14に貯留された予熱温水を最大限に利用するために、混合調節弁21が、風呂設定温度tbeを下回る予熱温水をそのままの状態で熱交換器22に送出し、給湯器20のバーナーを燃焼させることなく、風呂設定温度tbeを下回る予熱温水を浴槽に自動注湯することになる。
【0025】
これに対して、予熱温水温度tpが、基準温度tpsを下回っている場合は、混合調節弁21が、予熱温水と低温水とを混合することによって固定温度tbfの温水を生成する固定温度制御を行い、生成された固定温度tbfの温水を給湯器20の熱交換器22に送出しながら、給湯器20のバーナーを燃焼させることによって、風呂設定温度tbeの温水を生成し、これを浴槽に自動注湯することになる。
【0026】
従って、予熱温水温度tpが基準温度tpsを下回る場合は、浴槽への自動注湯を開始する前に浴槽に貯留されている残り湯等の初期貯留分のみを、自動注湯完了後に風呂設定温度tbeまで追い焚きすることになるが、予熱温水温度tpが基準温度tps以上の場合は、初期貯留分と注湯分の双方を、自動注湯完了後に風呂設定温度tbeまで追い焚きすることになる。
【0027】
以上のように、この給湯システム1では、浴槽への自動お湯張りを行う際に、予熱温水温度tpが風呂設定温度tbeを下回っているが、基準温度tps以上である場合は、その予熱温水をそのままの状態で浴槽に自動注湯した後、浴槽に注湯された温水が風呂設定温度tbeになるように、給湯器20が追い焚きを行うことになるので、予熱温水温度tpが風呂設定温度tbeより僅かに低いような場合であっても、蓄熱槽から送出される予熱温水を予め定められている所定温度まで一旦下げた後、給湯器で加熱することによって風呂設定温度の温水を生成し、これを浴槽に自動注湯するようになっている従来の給湯システムに比べて、給湯器20の燃料消費量を抑えることができる。
【0028】
一方、浴槽への自動お湯張りを行う際に、予熱温水温度tpが基準温度tpsを下回っているような場合は、給湯器20のバーナーを燃焼させることによって、風呂設定温度tbeの温水を生成し、これを浴槽に自動注湯するようになっているので、予熱温水温度tpが風呂設定温度tbeに比べてかなり低いような場合でも、自動注湯後の追焚時間が極端に長くなることがなく、自動お湯張りに要する時間を抑えつつ、蓄熱槽14に貯留された予熱温水を有効に利用した自動お湯張りを行うことができる。
【0029】
なお、上述した実施形態では、予熱温水温度tpが基準温度tpsを下回っている場合は、自動注湯後の追焚時間が長くならないように、給湯器20のバーナーを燃焼させることによって、風呂設定温度tbeの温水を浴槽に自動注湯するようにしているが、自動注湯後の追焚時間が長くなってもかまわないのであれば、予熱温水温度tpが風呂設定温度tbeを下回っている場合は、基準温度tpsを下回っているか否かに拘わらず、予熱温水をそのままの状態で浴槽に自動注湯するようにしてもよい。
【0030】
ただし、予熱温水温度tpが固定温度tbf以下である場合は、予熱温水温度tpをそれ以下に下げなくても、即ち、予熱温水に低温水を混合しなくても、給湯器20のバーナーを燃焼させることによって、風呂設定温度tbeの温水を確実に生成することができるので、燃料が無駄に使用されることはなく、逆に、固定温度tbf以下の予熱温水をそのままの状態で浴槽に自動注湯すると、その後の追焚時間が長くなるだけなので、予熱温水温度tpが固定温度tbfを上回っている場合にだけ、予熱温水をそのままの状態で浴槽に自動注湯することが望ましい。
【0031】
また、上述した各実施形態では、風呂設定温度tbe>予熱温水温度tp≧基準温度tpsの場合、風呂設定温度tbe>予熱温水温度tpの場合、または風呂設定温度tbe>予熱温水温度tp>固定温度tbfの場合は、常に、予熱温水をそのままの状態で浴槽に自動注湯するようになっているが、これに限定されるものではなく、例えば、浴槽への自動お湯張りを行う際に、予熱温水温度tpが風呂設定温度tbeを下回っている場合は、混合調節弁21が予熱温水に低温水を混合することによって固定温度tbfの温水を生成しながら熱交換器22に送出し、この固定温度tbfの温水を熱交換器22が加熱することによって、風呂設定温度tbeの温水を生成し、これを浴槽に自動注湯する設定温度注湯モードを設けておき、必要に応じて、設定温度注湯モードに切り換えて、浴槽への自動お湯張りを行うことができるようにしておくと、すぐに入浴したいような場合は、設定温度注湯モードに切り換えて浴槽への自動お湯張りを行うと、最短時間で自動お湯張りが完了するので、使い勝手が向上する。
【0032】
また、上述した各実施形態では、固定温度tsfを給湯設定温度tse−10℃、固定温度tbfを風呂設定温度tbe−10℃に設定しているが、これに限定されるものではなく、例えば、給湯設定温度tseが60℃以上、60℃未満35℃以上、35℃未満に場合分けし、60℃以上の場合は45℃、60℃未満35℃以上の場合は30℃、35℃未満の場合は25℃といった具合に、給湯設定温度tseや風呂設定温度tbeに応じて、固定的に設定することも可能であり、そのようにして固定温度tbfを設定した場合は、基準温度tpsについても固定的に設定すればよい。
【0033】
また、上述した各実施形態では、混合調節弁21が組み込まれた給湯器20を使用した給湯システムについて説明したが、これに限定されるものではなく、混合調節弁を有する給湯接続ユニットを介して、太陽熱利用温水器と通常の給湯器とを接続した給湯システムについても、本発明を適用することができる。
【0034】
また、上述した各実施形態では、補助熱源が太陽熱である給湯システムについて説明したが、補助熱源はこういった太陽熱に限定されるものではなく、例えば、コージェネレーションシステムにおけるガスエンジンやガスタービンの排熱を補助熱源とした給湯システムのように、種々の補助熱源を使用した給湯システムについて、本発明を適用することができることはいうまでもない。
【図面の簡単な説明】
【図1】この発明にかかる給湯システムの一実施形態を示す概略構成図である。
【符号の説明】
1 給湯システム
10 太陽熱利用温水器
14 蓄熱槽
15、17 給水管
16 予熱温水供給管
20 給湯器
20a コントローラ
21 混合調節弁
22 熱交換器
23 メイン流路
24 バイパス流路
25 バイパス弁
26 バイパス管
26a 電磁弁
27 予熱温水温度センサ
28 混合温水温度センサ
29 熱交換器温度センサ
30 操作リモコン
30a コントローラ
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water supply system in which a water heater having an automatic hot water filling function for a bathtub supplies hot water using preheated hot water generated by an auxiliary heat source such as solar heat.
[0002]
[Prior art]
As a hot water supply system using an auxiliary heat source, for example, after performing a hot water heater equipped with a heat storage tank for storing preheated hot water generated using solar heat as an auxiliary heat source, and automatic hot water pouring into a bathtub Conventionally, a hot water supply system combined with a hot water heater having an automatic hot water filling function for a bathtub that stores hot water at a bath set temperature in the bathtub by reheating as necessary is conventionally known.
[0003]
In such a hot water supply system, the solar water heater's heat storage tank and the water heater's heat exchanger are connected to each other, and stored in the solar water heater's heat storage tank during hot water supply or automatic hot water filling in the bathtub. Preheated hot water is sent to the heat exchanger of the water heater, but the preheated hot water stored in the heat storage tank is not only sent to the heat exchanger, but if necessary, the preheated hot water is cooled to the preheated hot water sent from the heat storage tank. The water heater is connected to the upstream side of the heat exchanger from the heat storage tank so that it can be sent to the heat exchanger in a state where water (normal tap water or water having a temperature lower than the preheated hot water) is mixed. A mixing control valve for mixing the preheated hot water and the low-temperature water to be fed at an arbitrary mixing ratio is mounted.
[0004]
Therefore, when filling hot water to the bathtub in the automatic hot water filling mode, if preheated hot water above the bath set temperature set for the water heater is stored in the heat storage tank, the mixing control valve of the water heater will The hot water of the bath set temperature is generated by appropriately mixing preheated hot water that is higher than the bath set temperature sent from the heat storage tank and low temperature water, and automatic injection into the bathtub without burning the burner that heats the heat exchanger. When hot water is to be used and preheated hot water at or above the bath set temperature is not stored in the heat storage tank, the mixing control valve of the water heater is preheated hot water and low temperature water below the bath set temperature sent from the heat storage tank. Are mixed as appropriate, while hot water at a predetermined temperature lower than the bath set temperature is sent to the heat exchanger, and the hot water at the bath set temperature is burned by burning a burner that heats the heat exchanger. Form, will be the automatic pouring it to the bathtub.
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional hot water supply system, even when the temperature of the preheated hot water stored in the heat storage tank is slightly lower than the bath set temperature, the water heater reliably generates hot water at the bath set temperature. Therefore, since the preheating hot water sent from the heat storage tank has to be once lowered to a predetermined temperature, the fuel consumption of the water heater required for the subsequent heating becomes larger than necessary and stored in the heat storage tank. There was a problem that automatic hot water filling to the bathtub could not be performed by effectively using the preheated hot water.
[0006]
Then, the subject of this invention is providing the hot-water supply system which can perform automatic hot water filling to a bathtub effectively using the preheating warm water produced | generated by the auxiliary heat source.
[0007]
[Means for solving the problems and effects thereof]
In order to solve the above problems, the invention according to claim 1 is directed to an automatic hot water filling in which hot water at a bath set temperature is stored in a bathtub by performing pouring as needed after automatic pouring into the bathtub. A hot water heater having a function, and a mixing control valve that mixes low-temperature water with preheated hot water generated by an auxiliary heat source, if necessary, and sends it to the heat exchanger of the water heater, and automatically fills the bathtub with hot water When preheated hot water over the bath set temperature is sent to the mixing control valve, the mixing control valve generates hot water at the bath setting temperature by mixing the low temperature water, and automatically supplies it to the bathtub. In a hot water supply system designed for pouring hot water, when automatic hot water filling is applied to a bathtub, preheated hot water that is lower than the bath set temperature is sent to the mixing control valve, and is sent to the mixing control valve. Preheated hot water When the temperature is lower than a predetermined reference temperature lower than the preset temperature, the mixing control valve mixes the low temperature water so that hot water having a predetermined temperature lower than the reference temperature is supplied to the heat exchanger of the water heater. When the hot water at the predetermined temperature is heated by the heat exchanger of the water heater, hot water at the bath set temperature is generated and automatically poured into the bathtub, but is sent to the mixing control valve. When the preheated hot water is equal to or higher than the reference temperature , a hot water supply system is provided in which the preheated hot water lower than the bath set temperature is automatically poured into the bathtub as it is.
[0008]
As described above, in this hot water supply system, when the hot water is filled in the bathtub, the preheated hot water sent to the mixing control valve is lower than the bath set temperature, but if it is higher than the reference temperature, the bath set temperature After the hot water below the hot water was poured into the bathtub as it was, the water heater would reheat so that the hot water poured into the bathtub would be at the bath set temperature, so it was generated by the auxiliary heat source Even if the temperature of the preheated hot water is slightly lower than the bath set temperature, the preheated hot water generated by the auxiliary heat source is once lowered to a predetermined temperature and then heated by a water heater. Compared with the conventional hot water supply system that generates hot water at the set temperature and automatically pours it into the bathtub, the fuel consumption of the hot water heater can be reduced, and the preheating temperature generated by the auxiliary heat source Effectively using it is possible to perform an automatic hot water tension to the bathtub.
[0009]
On the other hand, when the preheated hot water sent to the mixing control valve is below the reference temperature, the mixing control valve mixes the low temperature water so that the hot water has a predetermined temperature lower than the reference temperature. It was sent to the heat exchanger of the water heater by the hot water of the predetermined temperature heat exchanger of the water heater for heating, to generate a hot water bath set temperature, which to the automatic pouring the bathtub As a result, the hot water filling is performed effectively using the preheated hot water generated by the auxiliary heat source while suppressing the time required for the automatic hot water filling without excessively long time after the automatic hot water pouring. be able to.
[0010]
Further, as in the hot water supply system of the invention according to claim 2 , when preheating hot water to the bathtub is performed, when preheated hot water lower than the bath set temperature is sent to the mixing control valve, the mixing control valve By mixing the low-temperature water, the hot water having a predetermined temperature lower than the bath set temperature is sent to the heat exchanger of the hot water heater, and the hot water of the hot water heater is heated by the heat exchanger of the hot water heater. It is equipped with a set temperature pouring mode that generates hot water at the bath set temperature and automatically pours it into the bathtub, and if necessary, switches to the set temperature pouring mode and automatically fills the bath with hot water. If you want to take a bath right away, switch to the preset temperature pouring mode and fill the bath automatically, and the hot water fill will be completed in the shortest time, improving usability. .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 shows a schematic configuration of a hot water supply system 1 using preheated hot water generated by solar heat as an auxiliary heat source. In this hot water supply system 1, as shown in the figure, a solar water heater 10 and a hot water heater 20 are connected, and preheated hot water generated by the solar water heater 10 is sent to the water heater 20. It is like that.
[0012]
The solar-heated water heater 10 includes a solar heat collector 11 and a sealed heat storage tank 14, and a water supply pipe 15 for supplying low-temperature water to the lower end of the heat storage tank 14 is connected to the heat storage tank 14. In addition, a preheated hot water supply pipe 16 for sending the stored preheated hot water to the water heater 20 is connected to the upper end.
[0013]
In the solar collector 11, a heat medium circulation path is formed by a solar pipe 12 that connects the inlet side and the outlet side of the solar collector 11, and the solar pipe 12 is partially introduced into the heat storage tank 14. The heat exchanger 13 is provided. Therefore, the heat medium heated by the solar heat collector 11 is guided into the heat storage tank 14 through the solar pipe 12, and heat exchange with the water in the heat storage tank 14 is performed by the heat exchanging unit 13, thereby the heat storage tank. The preheated hot water is generated in 14.
[0014]
The hot water heater 20 has an automatic hot water filling function for a bathtub, and when hot water filling to the bathtub is started in the automatic hot water filling mode, the water heater 20 is automatically used until a predetermined water level or a predetermined amount of hot water is stored in the bathtub. When pouring is performed and the pouring is completed, if the hot water temperature in the bathtub is lower than the bath set temperature tbe, the hot water in the bath is automatically replenished until the bath set temperature tbe is reached. To be done.
[0015]
The water heater 20 includes a mixing control valve 21 that mixes low temperature water supplied via the water supply pipe 17 and preheated hot water supplied from the heat storage tank 14 via the preheated hot water supply pipe 16 as necessary. The main flow path 23 having the heat exchanger 22 connected to the outlet side of the mixing control valve 21 and heating the hot water delivered from the mixing control valve 21 as necessary is bypassed. And a bypass channel 24 connected to the main channel 23. The bypass channel 24 has a relatively low temperature delivered from the mixing control valve 21 to the hot water delivered from the heat exchanger 22. A bypass valve 25 for generating hot water having a hot water supply set temperature tse or a bath set temperature tbe by appropriately mixing the hot water is installed.
[0016]
In addition, a bypass pipe 26 that bypasses the mixing control valve 21 is connected to the main flow path 23 connected to the hot water outlet side of the water supply pipe 17 and the mixing control valve 21, and the bypass pipe 26 is energized. A diaphragm type electromagnetic valve 26a for blocking the flow path of the bypass pipe 26 is installed.
[0017]
Further, the preheated hot water supply pipe 16 connected to the mixing control valve 21, the upstream side of the connection part of the bypass pipe 26 in the main flow path 23, and the downstream side connection part of the heat exchanger 22 and the bypass flow path 24. A preheated hot water temperature sensor 27 for detecting the temperature (preheated hot water temperature) tp sent from the heat storage tank 14 and a temperature (mixed hot water temperature) tm sent from the mixing control valve 21 are detected. The heat exchanger temperature sensor 29 for detecting the mixed hot water temperature sensor 28 and the outlet hot water temperature of the heat exchanger 22 as the temperature (heat exchanger temperature) tc of the heat exchanger 22 itself is installed.
[0018]
Further, the water heater 20 is equipped with a controller 20a capable of communicating with the controller 30a of the operation remote controller 30 via a serial interface, and these controllers 20a and 30a cooperate with each other to supply hot water. The operation of the vessel 20 is comprehensively controlled.
[0019]
The controller 20a receives temperature detection signals from the preheating hot water temperature sensor 27, the mixed hot water temperature sensor 28, and the heat exchanger temperature sensor 29, as well as a hot water supply set temperature tse and a bath set temperature set by the operation remote controller 30. The tbe, the operation switch signal, and the like are transmitted from the controller 30a of the operation remote controller 30, and the controller 20a controls the mixing control valve 21 based on these temperature detection signals and the hot water supply set temperature tse or the bath set temperature tbe. The burner (not shown) for heating the bypass valve 25 and the heat exchanger 22 is controlled.
[0020]
First, when hot water is supplied or when hot water is filled in the bathtub in the automatic hot water filling mode, the temperature of the preheated hot water sent from the heat storage tank 14, that is, the preheated hot water temperature detected by the preheated hot water temperature sensor 27 is used. When tp is equal to or higher than the hot water supply set temperature tse or the bath set temperature tbe, hot water having the hot water set temperature tse or the bath set temperature tbe is supplied by appropriately mixing low temperature water without burning the burner of the water heater 20. Therefore, the temperature of the warm water delivered from the mixing control valve 21, that is, the temperature of the mixed water detected by the mixed warm water temperature sensor 28 is set to the hot water supply set temperature tse or the bath set temperature tbe. The set temperature control for adjusting the opening degree of 21 is performed. Therefore, when hot water is filled in the bathtub in the automatic hot water filling mode, the hot water of the bath set temperature tbe is automatically poured into the bathtub without burning the burner of the water heater 20.
[0021]
On the other hand, when hot water is supplied or when hot water is filled in the bathtub in the automatic hot water filling mode, when the preheated hot water temperature tp is lower than the hot water supply set temperature tse or the bath set temperature tbe, As shown, the mixing control valve 21 performs different control depending on whether normal hot water supply is performed or when hot water is filled in the bathtub in the automatic hot water filling mode.
[0022]
First, when hot water is supplied, if the preheating hot water temperature tp is lower than the hot water supply set temperature tse, the hot water at the hot water supply set temperature tse cannot be supplied unless the burner of the water heater 20 is burned. A predetermined temperature (hereinafter, referred to as a fixed temperature) tsf (hot water supply set temperature tse-10 ° C.) so that hot water having a hot water supply set temperature tse can be reliably generated by burning the burner of the vessel 20. ) Is sent to the heat exchanger 22 to adjust the opening of the mixing control valve 21 to perform fixed temperature control for mixing low temperature water.
[0023]
On the other hand, when the hot water filling to the bathtub is performed in the automatic hot water filling mode, if the preheated hot water temperature tp is lower than the bath set temperature tbe, as shown below, the preheated hot water temperature tp is set to the bath set temperature tbe. Depending on whether or not the temperature is equal to or higher than a reference temperature tps (for example, bath set temperature tbe-6 ° C.) set between the fixed temperature tbf (bath set temperature tbe−10 ° C.), a different hot water pouring operation is executed. Become.
[0024]
First, when the preheated hot water temperature tp is equal to or higher than the reference temperature tps, the mixing control valve 21 uses the preheated hot water below the bath set temperature tbe as it is in order to make maximum use of the preheated hot water stored in the heat storage tank 14. In this state, the preheated hot water lower than the bath set temperature tbe is automatically poured into the bathtub without burning the burner of the water heater 20 to the heat exchanger 22.
[0025]
On the other hand, when the preheated hot water temperature tp is lower than the reference temperature tps, the mixing control valve 21 performs the fixed temperature control for generating the hot water having the fixed temperature tbf by mixing the preheated hot water and the low temperature water. The hot water having the set temperature tbe is generated by burning the burner of the water heater 20 while sending the generated hot water having the fixed temperature tbf to the heat exchanger 22 of the water heater 20. You will be pouring water.
[0026]
Therefore, when the preheated hot water temperature tp is lower than the reference temperature tps, only the initial storage such as the remaining hot water stored in the bathtub before starting the automatic pouring to the bathtub is set to the bath set temperature after the automatic pouring is completed. However, when the preheated hot water temperature tp is equal to or higher than the reference temperature tps, both the initial storage amount and the pouring portion are replenished to the bath set temperature tbe after the automatic pouring is completed. .
[0027]
As described above, in the hot water supply system 1, when the hot water is filled in the bathtub, the preheated hot water temperature tp is lower than the bath set temperature tbe, but when the hot water temperature is equal to or higher than the reference temperature tps, the preheated hot water is used. Since the hot water heater 20 is reheated so that the hot water poured into the bathtub becomes the bath set temperature tbe after automatically pouring into the bathtub as it is, the preheated hot water temperature tp is the bath set temperature. Even if the temperature is slightly lower than tbe, the preheated hot water sent from the heat storage tank is once lowered to a predetermined temperature, and then heated with a water heater to generate hot water having a bath set temperature. The fuel consumption of the water heater 20 can be reduced as compared with the conventional hot water supply system in which this is automatically poured into the bathtub.
[0028]
On the other hand, when the hot water is filled in the bathtub, if the preheated hot water temperature tp is lower than the reference temperature tps, the hot water of the bath set temperature tbe is generated by burning the burner of the water heater 20. Since this is automatically poured into the bathtub, even when the preheated hot water temperature tp is considerably lower than the bath set temperature tbe, the memorial time after automatic pouring may become extremely long. In addition, automatic hot water filling that effectively uses the preheated hot water stored in the heat storage tank 14 can be performed while suppressing the time required for automatic hot water filling.
[0029]
In the above-described embodiment, when the preheating hot water temperature tp is lower than the reference temperature tps, the bath setting is performed by burning the burner of the water heater 20 so that the reheating time after the automatic pouring is not increased. When hot water of temperature tbe is automatically poured into the bathtub, if the reheating time after automatic pouring does not matter, the preheated hot water temperature tp is lower than the bath set temperature tbe Regardless of whether the temperature is lower than the reference temperature tps, the preheated hot water may be automatically poured into the bathtub as it is.
[0030]
However, when the preheated hot water temperature tp is equal to or lower than the fixed temperature tbf, the burner of the water heater 20 is burned without lowering the preheated hot water temperature tp, that is, without mixing low temperature water with the preheated hot water. By doing so, the hot water at the bath set temperature tbe can be reliably generated, so that the fuel is not wasted, and conversely, the preheated hot water at a fixed temperature tbf or lower is automatically poured into the bathtub as it is. If hot water is used, the subsequent renewal time only becomes longer. Therefore, it is desirable to automatically pour the preheated hot water into the bathtub as it is only when the preheated hot water temperature tp exceeds the fixed temperature tbf.
[0031]
In each of the above-described embodiments, when the bath set temperature tbe> the preheated hot water temperature tp ≧ the reference temperature tps, the bath set temperature tbe> the preheated hot water temperature tp, or the bath set temperature tbe> the preheated hot water temperature tp> the fixed temperature. In the case of tbf, the hot water is always automatically poured into the bathtub with the preheated hot water as it is. However, the present invention is not limited to this. For example, when performing hot water filling to the bathtub, preheating is performed. When the hot water temperature tp is lower than the bath set temperature tbe, the mixing control valve 21 mixes the preheated hot water with the low-temperature water and generates the hot water having the fixed temperature tbf and sends it to the heat exchanger 22, and this fixed temperature. The heat exchanger 22 heats the hot water of tbf to generate hot water of the bath set temperature tbe, and a preset temperature pouring mode for automatically pouring the hot water into the bathtub is provided. Accordingly, if you switch to the preset temperature pouring mode and allow automatic hot water filling to the bathtub, if you want to take a bath immediately, switch to the preset temperature pouring mode and automatically When hot water filling is performed, automatic hot water filling is completed in the shortest time, and the usability is improved.
[0032]
Moreover, in each embodiment mentioned above, although fixed temperature tsf is set to hot water supply preset temperature tse-10 degreeC and fixed temperature tbf is set to bath preset temperature tbe-10 degreeC, it is not limited to this, For example, When the hot water supply set temperature tse is 60 ° C. or more, less than 60 ° C., 35 ° C. or more, and less than 35 ° C., when it is 60 ° C. or more, it is 45 ° C. Can be fixedly set according to the hot water supply set temperature tse and bath set temperature tbe, such as 25 ° C. When the fixed temperature tbf is set in this way, the reference temperature tps is also fixed. It is sufficient to set it automatically.
[0033]
Moreover, although each embodiment mentioned above demonstrated the hot water supply system using the hot water heater 20 in which the mixing control valve 21 was incorporated, it is not limited to this, The hot water supply connection unit which has a mixing control valve is used. The present invention can also be applied to a hot water supply system in which a solar water heater and a normal water heater are connected.
[0034]
Further, in each of the above-described embodiments, the hot water supply system in which the auxiliary heat source is solar heat has been described. However, the auxiliary heat source is not limited to such solar heat. For example, the exhaust gas from a gas engine or a gas turbine in a cogeneration system is used. Needless to say, the present invention can be applied to a hot water supply system using various auxiliary heat sources, such as a hot water supply system using heat as an auxiliary heat source.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an embodiment of a hot water supply system according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hot water supply system 10 Solar water heater 14 Heat storage tanks 15 and 17 Water supply pipe 16 Preheated hot water supply pipe 20 Hot water heater 20a Controller 21 Mixing control valve 22 Heat exchanger 23 Main flow path 24 Bypass flow path 25 Bypass valve 26 Bypass pipe 26a Electromagnetic Valve 27 Preheated hot water temperature sensor 28 Mixed hot water temperature sensor 29 Heat exchanger temperature sensor 30 Operation remote controller 30a Controller

Claims (2)

浴槽へ自動注湯を行った後、必要に応じて追い焚きを行うことによって、風呂設定温度の温水を浴槽に貯留する自動お湯張り機能を有する給湯器と、補助熱源によって生成された予熱温水に、必要に応じて低温水を混合して前記給湯器の熱交換器に送出する混合調節弁とを備え、
浴槽への自動お湯張りを行う際に、風呂設定温度以上の予熱温水が前記混合調節弁に送出される場合は、前記混合調節弁が低温水を混合することによって風呂設定温度の温水を生成し、これを浴槽に自動注湯するようになっている給湯システムにおいて、
浴槽への自動お湯張りを行う際に、風呂設定温度を下回る予熱温水が前記混合調節弁に送出される場合であって、
前記混合調節弁に送出される予熱温水が風呂設定温度より低い予め定められた基準温度を下回っている場合は、前記混合調節弁が低温水を混合することによって基準温度より低い予め定められた所定温度の温水を前記給湯器の熱交換器に送出し、この所定温度の温水を前記給湯器の熱交換器が加熱することによって、風呂設定温度の温水を生成し、これを浴槽に自動注湯するが、前記混合調節弁に送出される予熱温水が前記基準温度以上の場合は、風呂設定温度を下回る予熱温水をそのままの状態で浴槽に自動注湯するようになっていることを特徴とする給湯システム。
After hot water is poured into the bathtub, it is reheated as necessary, so that the hot water heater with an automatic hot water filling function that stores hot water at the bath set temperature in the bathtub and the preheated hot water generated by the auxiliary heat source A mixing control valve that mixes low temperature water as needed and sends it to the heat exchanger of the water heater,
When preheating hot water over the bath set temperature is sent to the mixing control valve during automatic hot water filling of the bathtub, the mixing control valve generates hot water at the bath setting temperature by mixing low temperature water. In the hot water supply system that automatically pours this into the bathtub,
When performing automatic hot water filling to the bathtub, when preheated hot water lower than the bath set temperature is sent to the mixing control valve ,
When the preheated hot water delivered to the mixing control valve is below a predetermined reference temperature lower than the bath setting temperature, the mixing control valve mixes the low temperature water to make a predetermined predetermined lower than the reference temperature Hot water at a temperature is sent to a heat exchanger of the water heater, and the hot water at the predetermined temperature is heated by the heat exchanger of the water heater to generate hot water at a bath set temperature, which is automatically poured into a bathtub. However, when the preheated hot water sent to the mixing control valve is equal to or higher than the reference temperature, the preheated hot water below the bath set temperature is automatically poured into the bathtub as it is. Hot water system.
浴槽への自動お湯張りを行う際に、風呂設定温度を下回る予熱温水が前記混合調節弁に送出される場合は、前記混合調節弁が低温水を混合することによって風呂設定温度より低い予め定められた所定温度の温水を前記給湯器の熱交換器に送出し、この所定温度の温水を前記給湯器の熱交換器が加熱することによって、風呂設定温度の温水を生成し、これを浴槽に自動注湯する設定温度注湯モードを備え、
必要に応じて、前記設定温度注湯モードに切り換えて、浴槽への自動お湯張りを行うことができるようになっている請求項1に記載の給湯システム。
When preheating hot water lower than the bath set temperature is sent to the mixing control valve when performing automatic hot water filling to the bathtub, the mixing control valve is previously set lower than the bath setting temperature by mixing low temperature water. The hot water at a predetermined temperature is sent to the heat exchanger of the hot water heater, and the hot water at the predetermined temperature is heated by the heat exchanger of the hot water heater to generate hot water at a bath set temperature, which is automatically transferred to the bathtub. It has a set temperature pouring mode for pouring hot water,
The hot water supply system according to claim 1 , wherein the hot water filling to the bathtub can be performed by switching to the preset temperature pouring mode as required .
JP2002198602A 2002-07-08 2002-07-08 Hot water system Expired - Fee Related JP3876196B2 (en)

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