JP3841004B2

JP3841004B2 - Heat pump type water heater and its boiling control method

Info

Publication number: JP3841004B2
Application number: JP2002087582A
Authority: JP
Inventors: 興隆渡邊; 宗平岡; 圭柳本; 正明古内
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2002-03-27
Filing date: 2002-03-27
Publication date: 2006-11-01
Anticipated expiration: 2022-03-27
Also published as: JP2003287277A

Description

【０００１】
【発明の属する技術分野】
本発明はヒートポンプサイクルを利用したヒートポンプ式給湯器に関するものである。
【０００２】
【従来の技術】
最近、ＣＯ_２冷媒を使用するヒートポンプ式給湯器が公知である。この給湯器では、沸き上げ温度を９０℃以上の高温に加熱することができ、加熱効率が高いという利点を有するが、貯湯タンク内の液体の温度を衛生面より予め設定された所定温度以上にする必要があり、ヒートポンプ本体に給水される液体の温度が高くなると、加熱効率が低下する。
また、湯の使用量が少ない場合、貯湯タンク内に多量の湯が残り、貯湯タンク内の多量の湯が一様に低下し、加熱動作開始すると、少量沸き上げてすぐヒートポンプに給水される液体の温度が加熱停止温度以上になり運転をすぐ停止してしまい、翌日は貯湯タンク内の蓄熱量が少なくなる。
図１１は従来のヒートポンプ式給湯器の構成図であり、図１２はヒートポンプ本体の構成図であり、図１３は従来のヒートポンプ式給湯器の制御装置のブロック図であり、図１４はその沸き上げ制御動作のフローチャートである。
【０００３】
図１１において、１は給湯器本体、２は前記本体１内に配設された貯湯タンク、３は前記貯湯タンク２の下部と接続された給水配管、３ａはこの給水配管３に設けられた減圧弁、４は前記貯湯タンク２の上部と接続された給湯配管、４ａは逃し弁、５は前記貯湯タンク２の外壁面に取り付けられ、貯湯タンク２内の水の温度を検出する温度センサＡで、その温度センサＡ５を貯湯タンク２の外壁面のある所定容量の位置に取り付けることにより、その取り付け位置の検出温度から前記貯湯タンク２内の残湯量も検出する。６は前記貯湯タンク２の下部配管に取り付けられ、ヒートポンプ本体の加熱動作を停止するための温度を検出する温度センサＢである。
【０００４】
７はヒートポンプ本体１０のヒートサイクルで発生した熱を貯湯タンク２内の水に置換するため、冷水管１０ａと温水管１０ｂとにより貯湯タンク２内の水をヒートポンプ本体１０との間で循環させる循環ポンプである。貯湯タンク２下部に接続された冷水管１０ａより循環ポンプ７でヒートポンプ本体１０に水が供給され、ヒートポンプ本体１０で加熱された水を貯湯タンク２の上部に接続された温水管１０ｂにより戻し貯湯タンク２内上部より貯湯する。
【０００５】
８は前記貯湯タンク２内の水の沸き上げ、ヒートポンプの運転開始・停止を制御する制御部であり、前記温度センサＡ５、及び温度センサＢ６の検出値と沸き上げ温度を設定する操作部９からの入力値に基づいて、前記ヒートポンプ本体１０への加熱動作開始・停止及び循環ポンプ７の運転を制御する。
【０００６】
図１２おいて、ヒートポンプ本体１０のヒートポンプサイクルは圧縮機１１、給湯用熱交換器１２、膨張弁１３、室外熱交換器１４、アキュームレータ１５を順次冷媒配管１０ｃにより接続して構成されている。ここで、室外熱交換器１４に吸熱するためにファン１６が取り付けてあり、また、給湯用熱交換器１２は圧縮器１１より吐出された高圧のガス冷媒と給湯用の水とを熱交換するもので、冷媒が流れる冷媒通路１２ａと給湯用の水が流れる給湯用水通路１２ｂを有する。
【０００７】
次に、従来の沸き上げ制御動作について、図１４のフローチャートを用いて説明する。
まず、沸き上げ制御をスタートすると（Ｓ２１）、制御部８で温度センサＡ５の取り付け位置の検出温度から貯湯タンク２内の残湯量の有無を検出し（Ｓ２２）、該残湯量が所定量（例えば２００Ｌ）以下か否か判断され（Ｓ２３）、残湯量が所定量以上であれば、沸き上げを行わず、残湯量検出に戻る（Ｓ２２）。もし、残湯量が所定量以下（Ｓ２３）であれば、制御部８の指示で循環ポンプ７、及びヒートポンプサイクルを運転してヒートポンプ本体１０は一定の加熱能力（例えば４．５ＫＷ）で加熱動作を開始し（Ｓ２４）、貯湯タンク２上部より操作部９で設定された貯湯温度Ｔ_２℃（例えば７５℃）で湯を沸き上げ、温度センサＡ５が貯湯温度Ｔ_２℃（例えば７５℃）を検出したかどうかを判定し（Ｓ２５）、温度センサＡ５がＴ_２℃（例えば７５℃）を検出すると、加熱動作を停止する（Ｓ２７）。温度センサＡ５が貯湯温度Ｔ_２℃（例えば７５℃）を検出しないときは、温度センサＢ６が所定温度（例えば６０℃）を検出したかどうかを判定し（Ｓ２６）、温度センサＢ６が所定温度（例えば６０℃）を検出しないときは温度センサＡ５が貯湯温度Ｔ_２℃（例えば７５℃）を検出したかどうかの判定（Ｓ２５）にもどり、温度センサＢ６が所定温度（例えば６０℃）を検出すると、制御部８の指示でヒートポンプ本体１０の加熱動作を停止させて（Ｓ２７）、沸き上げ制御を終了する（Ｓ２８）。
【０００８】
【発明が解決しようとする課題】
従来のヒートポンプ式給湯器は、温度センサＡ５の取り付け位置の検出温度から貯湯タンク２内の残湯量の有無を検出し、所定量以下になると、所定温度（例えば７５℃）でヒートポンプ本体１０の加熱動作を開始し、温度センサＢ６の温度が予め設定された所定温度（例えば６０℃）になると、ヒートポンプ本体１０の加熱動作を停止しているので、通常の使用湯量と比べて前日の使用湯量が極端に少ない場合は、貯湯タンク２内の湯温が一様に約１０℃低下してしまい（例えば１日経過時は貯湯タンクの温度は約６５℃）、次回の沸き上げで温度センサＢ６の温度が予め設定された所定温度（例えば６０℃）以上に貯湯タンク２内の残湯ですぐになって加熱動作を停止し、貯湯タンク２に必要熱量を蓄熱できず湯切れが発生するという問題点があった。
【０００９】
本発明は上記のような問題点を解消するためになされたもので、通常使用湯量と比べて前日の使用湯量が極端に少ない場合に、湯切れを防止することができるヒートポンプ式給湯器及びその沸き上げ制御方法を提供することを目的とする。
【００１０】
【課題を解決するための手段】
本発明に係る請求項１記載のヒートポンプ式給湯器は、ヒートポンプサイクルを用いて給湯用の液体を加熱し、その加熱された液体を給湯器本体の貯湯タンク上部より蓄え、貯湯タンク下部より加熱源であるヒートポンプ本体に戻し、貯湯タンク下部又はヒートポンプ本体に戻す液体の温度が貯湯温度より低い予め設定された所定温度になると加熱動作を停止するヒートポンプ式給湯器において、前記貯湯タンクに蓄えられる液体の貯湯温度を状況に応じて適宜変更する貯湯温度変更手段と、過去数日の使用湯量を記憶する使用湯量記憶手段を備え、過去数日の使用湯量の平均値より前日の使用湯量が所定量以上少ない場合の加熱動作において、貯湯タンクに蓄えられる液体の貯湯温度を最高貯湯温度に変更するものである。
【００１１】
また、請求項２記載のヒートポンプ式給湯器は、ヒートポンプの加熱動作停止温度を変更する加熱動作停止温度変更手段を備え、過去数日の使用湯量の平均値より前日の使用湯量が所定量以上少ない場合の加熱動作において、貯湯タンクに蓄えられる液体の貯湯温度を最高貯湯温度に変更し、かつヒートポンプサイクルの加熱動作停止温度を最高加熱動作停止温度に変更するものである。
【００１２】
また、請求項３記載のヒートポンプ式給湯器は、ヒートポンプサイクルを用いて給湯用の液体を加熱し、その加熱された液体を給湯器本体の貯湯タンク上部より蓄え、貯湯タンク下部より加熱源であるヒートポンプ本体に戻し、貯湯タンク下部又はヒートポンプ本体に戻す液体の温度が貯湯温度より低い予め設定された所定温度になると加熱動作を停止するヒートポンプ式給湯器において、前記貯湯タンクに蓄えられる液体の貯湯温度を状況に応じて適宜変更する貯湯温度変更手段と、過去数日の使用湯量を記憶する使用湯量記憶手段と、過去数日の貯湯タンクに蓄えられた液体の貯湯温度を記憶する貯湯温度記憶手段とを備え、過去数日の使用湯量の平均値より前日の使用湯量が所定量以上少ない場合の加熱動作において、貯湯タンクに蓄えられる液体の貯湯温度を加熱動作１回のみ最高貯湯温度に変更し、以降の加熱動作は貯湯温度記憶手段に記憶された過去数日の貯湯温度又は設定された貯湯温度に戻すものである。
【００１３】
また、請求項４記載のヒートポンプ式給湯器は、ヒートポンプの加熱動作停止温度を変更する加熱動作停止温度変更手段を備え、過去数日の使用湯量の平均値より前日の使用湯量が所定量以上少ない場合の加熱動作において、貯湯タンクに蓄えられる液体の貯湯温度と加熱動作停止温度を加熱動作１回のみ最高貯湯温度と最高加熱動作停止温度に変更し、以降の加熱動作は貯湯温度記憶手段に記憶された過去数日の貯湯温度又は設定された貯湯温度と設定されている加熱動作停止温度に戻すものである。
【００１４】
また、請求項５記載のヒートポンプ式給湯器の沸き上げ制御方法は、ヒートポンプサイクルを用いて給湯用の液体を加熱し、その加熱された液体を給湯器本体の貯湯タンク上部より蓄え、貯湯タンク下部より加熱源であるヒートポンプ本体に戻し、貯湯タンク下部又はヒートポンプ本体に戻す液体の温度が貯湯温度より低い予め設定された所定温度になると加熱動作を停止するヒートポンプ式給湯器の沸き上げ制御において、前記貯湯タンクに蓄えられた過去数日の使用湯量を記憶しておき、過去数日の使用湯量の平均値より前日の使用湯量が所定量以上少ない場合に、前記貯湯タンクに蓄えられる液体の貯湯温度を最高貯湯温度に変更して沸き上げる。
【００１５】
また、請求項６記載のヒートポンプ式給湯器の沸き上げ制御方法は、過去数日の使用湯量の平均値より前日の使用湯量が所定量以下の場合に、貯湯タンクに蓄えられる液体の貯湯温度を最高貯湯温度に変更して沸き上げ、かつヒートポンプサイクルの加熱動作停止温度を最高加熱動作停止温度に変更して沸き上げる。
【００１６】
また、請求項７記載のヒートポンプ式給湯器の沸き上げ制御方法は、ヒートポンプサイクルを用いて給湯用の液体を加熱し、その加熱された液体を給湯器本体の貯湯タンク上部より蓄え、貯湯タンク下部より加熱源であるヒートポンプ本体に戻し、貯湯タンク下部又はヒートポンプ本体に戻す液体の温度が貯湯温度より低い予め設定された所定温度になると加熱動作を停止するヒートポンプ式給湯器の沸き上げ制御において、過去数日の使用湯量と過去数日の貯湯タンクに蓄えられた液体の貯湯温度を記憶しておき、過去数日の使用湯量の平均値より前日の使用湯量が所定量以上少ない場合に、前記貯湯タンクに蓄えられる液体の貯湯温度を加熱動作１回のみ最高貯湯温度に変更して沸き上げ、以降の加熱動作は記憶しておいた過去数日の貯湯温度又は設定された貯湯温度に戻して沸き上げる。
【００１７】
また、請求項８記載のヒートポンプ式給湯器の沸き上げ制御方法は、過去数日の使用湯量の平均値より前日の使用湯量が所定量以上少ない場合に、貯湯タンクに蓄えられる液体の貯湯温度とヒートポンプサイクルの加熱動作停止温度を加熱動作１回のみ最高貯湯温度と最高加熱動作停止温度に変更して沸き上げ、以降の加熱動作は記憶しておいた過去数日の貯湯温度又は設定された貯湯温度と加熱動作停止温度に戻して沸き上げる。
【００１８】
【発明の実施の形態】
実施の形態１．
図１は本発明の実施の形態１を示すヒートポンプ式給湯器の構成図、図２は本発明の実施の形態１における制御装置のブロック図、図３は本発明の実施の形態１における沸き上げ制御動作を示すフローチャートである。
なお、本発明の実施の形態１におけるヒートポンプ本体の構成図は図１２に示した従来の構成と同一であるため、説明を省略する。
図１に示す本発明の実施の形態１における構成図と図１２に示す従来のヒートポンプ式給湯器の構成図とで異なる点は、本発明の実施の形態１においては、４の給湯配管に使用湯量を検出する流量センサ１７の追加と制御部８の構成だけである。すなわち、本発明の実施の形態１における制御部８は、図２のブロック図に示すように貯湯タンク２内の水の沸き上げ、及びヒートポンプの運転開始・停止を制御する他に、貯湯タンク２に貯えられる貯湯温度を状況に応じて適宜変更する貯湯温度変更手段８ａと、前日の使用湯量及び過去数日の使用湯量の平均値を記憶しておく使用湯量記憶手段８ｂを備えている。
ここで、貯湯タンク２の貯湯温度は、図４に示すように、制御部８で水温によって変化させており、操作部９での設定やユーザーの使用湯量が少ない場合に最高貯湯温度（９０℃）以下の貯湯温度で沸き上げている。この実施の形態１においては、貯湯温度変更手段８ａにより水温１５℃までは貯湯温度を最高貯湯温度の９０℃一定、水温１５℃〜２５℃の範囲は水温に逆比例して貯湯温度を変更し、水温２５℃以上では７５℃一定に変更する。
【００１９】
本実施の形態１におけるヒートポンプ式給湯器の沸き上げ制御動作について、図３のフローチャートを用いて説明する。
なお、従来例と同一または相当部分については説明を省略する。
【００２０】
まず、沸き上げ制御をスタートすると（Ｓ１）、制御部８ｂの使用湯量記憶手段により過去数日の使用湯量を読込み（Ｓ２）、前日の使用湯量を読込む（Ｓ３）。使用湯量は流量センサ１７で検出する。制御部８で過去数日の使用湯量の平均値と前日の使用湯量を比較する（Ｓ４）。過去数日の使用湯量の平均値に比べて前日の使用湯量が所定量（例えば１００Ｌ）以上少ないかどうか確認する（Ｓ５）。
過去数日の使用湯量の平均値より前日の使用湯量の差が所定量（例えば１００Ｌ）以下の場合は（Ｓ５）、制御部８の指示で循環ポンプ７、及びヒートポンプサイクルを運転してヒートポンプ本体１０は一定の加熱能力（例えば４．５ＫＷ）で加熱動作を開始し（Ｓ１１）、貯湯タンク２上部より操作部９で設定された貯湯温度Ｔ_２℃（本例の場合は、７５℃）で湯を沸き上げ、温度センサＡ５が貯湯温度Ｔ_２℃（７５℃）を検出したかどうかを判定し（Ｓ１２）、温度センサＡ５が貯湯温度Ｔ_２℃（７５℃）を検出すると、加熱動作を停止させて（Ｓ９）、沸き上げ制御を終了する（Ｓ１０）。
ステップＳ１２で、温度センサＡ５が貯湯温度Ｔ_２℃（７５℃）を検出しないときは、温度センサＢ６が所定温度（例えば６０℃）を検出したかどうかを判定し（Ｓ８Ａ）、温度センサＢ６が所定温度（例えば６０℃）を検出しないときは温度センサＡ５が貯湯温度Ｔ_２℃（７５℃）を検出したかどうかの判定（Ｓ１２）にもどり、温度センサＢ６が所定温度（６０℃）を検出すると（Ｓ８Ａ）、制御部８の指示でヒートポンプ本体１０の加熱動作を停止させて（Ｓ９）、沸き上げ制御を終了する（Ｓ１０）。
一方、ステップＳ５で、過去数日の使用湯量の平均値よりも前日の使用湯量が所定量（例えば１００Ｌ）以上少ない場合は、制御部８の指示で循環ポンプ７、及びヒートポンプサイクルを運転してヒートポンプ本体１０は一定の加熱能力（例えば４．５ＫＷ）で加熱動作を開始し（Ｓ６）、貯湯タンク２上部より貯湯温度可変手段８ａで最高貯湯温度Ｔ_１℃（本例の場合は、９０℃）で湯を沸き上げ、温度センサＡ５が最高貯湯温度Ｔ_１℃（９０℃）を検出したかどうかを判定し（Ｓ７）、温度センサＡ５が最高貯湯温度Ｔ_１℃（９０℃）を検出すると、加熱動作を停止させて（Ｓ９）、沸き上げ制御を終了する（Ｓ１０）。
ステップＳ９で、温度センサＡ５が最高貯湯温度Ｔ_１℃（９０℃）を検出しないときは、温度センサＢ６が所定温度（６０℃）を検出したかどうかを判定し（Ｓ８）、温度センサＢ６が所定温度（６０℃）を検出しないときは温度センサＡ５が最高貯湯温度Ｔ_１℃（９０℃）を検出したかどうかの判定（Ｓ７）にもどり、温度センサＢ６が所定温度（６０℃）を検出すると、制御部８の指示でヒートポンプ本体１０の加熱動作を停止させて（Ｓ９）、沸き上げ制御を終了する（Ｓ１０）。
【００２１】
このように、本実施の形態１によれば、過去数日の使用湯量の平均値より前日の使用湯量が所定量（例えば１００Ｌ）以上少ない場合、貯湯温度は最高貯湯温度に変更され、高温の湯を貯湯できるので、通常運転状態よりも蓄熱量を多くでき、湯切れを防止できる。
【００２２】
実施の形態２．
図５は本発明の実施の形態２における制御装置のブロック図、図６は本発明の実施の形態２における沸き上げ制御動作を示すフローチャートである。
なお、本発明の実施の形態２において、ヒートポンプ式給湯器の構成及びヒートポンプ本体の構成図はそれぞれ図１及び図１２に示した従来構成と同一であるため、説明を省略する。
図５において、実施の形態１と異なる点は、制御部８の構成だけである。すなわち、本発明の実施の形態２においては、制御部８は、貯湯タンク２内の水の沸き上げ、及びヒートポンプの運転開始・停止を制御する他に、貯湯タンク２に貯えられる貯湯温度を状況に応じて適宜変更する貯湯温度変更手段８ａと、前日の使用湯量及び過去数日の使用湯量の平均値を記憶しておく使用湯量記憶手段８ｂと、ヒートポンプの加熱動作停止温度を変更する加熱動作停止温度変更手段８ｃとを備えている。
【００２３】
本実施の形態２におけるヒートポンプ式給湯器の沸き上げ制御動作について、図６のフローチャートを用いて説明する。
なお、従来例と同一または相当部分については説明を省略する。
なお、ステップＳ１３以外は実施の形態１と同じであり、説明を省略する。
ステップＳ５で、過去数日の使用湯量の平均値よりも前日の使用湯量が所定量（例えば１００Ｌ）以上少ない場合は、制御部８の指示で循環ポンプ７、及びヒートポンプサイクルを運転してヒートポンプ本体１０は一定の加熱能力（例えば４．５ＫＷ）で加熱動作を開始し（Ｓ６）、貯湯タンク２上部より貯湯温度変更手段８ａで最高貯湯温度Ｔ_１℃（本例の場合は、９０℃）で湯を沸き上げる（Ｓ７）。温度センサＢ６が加熱動作停止温度変更手段８ｂで加熱動作停止温度を最高加熱動作停止温度（本例の場合は、８０℃）に変更し、最高加熱動作停止温度（８０℃）を検出すると（Ｓ１３）、制御部８の指示でヒートポンプ本体１０の加熱動作を停止させて（Ｓ９）、沸き上げ制御を終了する（Ｓ１０）。
【００２４】
このように、本実施の形態２によれば、過去数日の使用湯量の平均値より前日の使用湯量が所定量（例えば１００Ｌ）以上少ない場合、特に全く湯を使用しなかった場合、貯湯温度は最高貯湯温度に設定され、高温の湯を貯湯し、かつ、加熱動作停止温度も最高加熱停止温度に変更されるので、残湯の温度によらず貯湯タンクを一様に高温に沸き上げることができ、通常運転状態よりも確実に蓄熱量を多くでき、湯切れを防止できる。
【００２５】
実施の形態３．
図７は本発明の実施の形態３における制御装置のブロック図、図８は本発明の実施の形態３における沸き上げ制御動作を示すフローチャートである。
なお、本発明の実施の形態３において、ヒートポンプ式給湯器の構成及びヒートポンプ本体の構成図はそれぞれ図１及び図１２に示した従来構成と同一であるため、説明を省略する。
図７において、実施の形態１と異なる点は、制御部８の構成だけである。
すなわち、本発明の実施の形態３においては、制御部８は、貯湯タンク２内の水の沸き上げ、及びヒートポンプの運転開始・停止を制御する他に、貯湯タンク２に貯えられる貯湯温度を状況に応じて適宜変更する貯湯温度変更手段８ａと、前日の使用湯量及び過去数日の使用湯量の平均値を記憶しておく使用湯量記憶手段８ｂと、過去数日の貯湯タンク２に蓄えられた貯湯温度を記憶する貯湯温度記憶手段８ｄとを備えている。
【００２６】
本実施の形態３におけるヒートポンプ式給湯器の沸き上げ制御動作について、図８のフローチャートを用いて説明する。
なお、従来例と同一または相当部分については説明を省略する。
【００２７】
まず、沸き上げ制御をスタートすると（Ｓ１）、制御部８ｄの貯湯温度記憶手段で過去の貯湯温度を読み出す（Ｓ１４）。制御部８ｂの使用湯量記憶手段により過去数日の使用湯量の平均値を読込み（Ｓ２）、前日の使用湯量を読込む（Ｓ３）。使用湯量は流量センサ１７で検出する。制御部８で過去数日の使用湯量の平均値と前日の使用湯量を比較する（Ｓ４）。過去数日の使用湯量の平均値に比べて前日の使用湯量が所定量（例えば１００Ｌ）以上少ないかどうか確認する（Ｓ５）。
過去数日の使用湯量の平均値より前日の使用湯量の差が所定量（例えば１００Ｌ）以下の場合は（Ｓ５）、制御部８の指示で循環ポンプ７、及びヒートポンプサイクルを運転してヒートポンプ本体１０は一定の加熱能力（例えば４．５ＫＷ）で加熱動作を開始し（Ｓ１１）、貯湯タンク２上部より操作部９で設定された貯湯温度Ｔ_２℃（本例の場合は、７５℃）で湯を沸き上げ、温度センサＡ５が貯湯温度Ｔ_２℃（７５℃）を検出したかどうかを判定し（Ｓ１２）、温度センサＡ５が貯湯温度Ｔ_２℃（７５℃）を検出すると、加熱動作を停止させて（Ｓ９）、沸き上げ制御を終了する（Ｓ１０）。
ステップＳ１２で、温度センサＡ５が貯湯温度Ｔ_２℃（７５℃）を検出しないときは、温度センサＢ６が所定温度（例えば６０℃）を検出したかどうかを判定し（Ｓ８Ａ）、温度センサＢ６が所定温度（例えば６０℃）を検出しないときは、温度センサＡ５が貯湯温度Ｔ_２℃（７５℃）を検出したかどうかの判定（Ｓ１２）にもどり、温度センサＢ６が所定温度（６０℃）を検出すると（Ｓ８Ａ）、制御部８の指示でヒートポンプ本体１０の加熱動作を停止させて（Ｓ９）、沸き上げ制御を終了する（Ｓ１０）。
一方、ステップＳ５で、過去数日の使用湯量の平均値よりも前日の使用湯量が所定量（例えば１００Ｌ）以上少ない場合は、制御部８の指示で循環ポンプ７、及びヒートポンプサイクルを運転してヒートポンプ本体１０は一定の加熱能力（例えば４．５ＫＷ）で加熱動作を開始し（Ｓ６）、貯湯タンク２上部より貯湯温度可変手段８ａで最高貯湯温度Ｔ_１℃（本例の場合は、９０℃）で湯を沸き上げ、温度センサＡ５が最高貯湯温度Ｔ_１℃（９０℃）を検出したかどうかを判定し（Ｓ７）、温度センサＡ５が最高貯湯温度Ｔ_１℃（９０℃）を検出すると、加熱動作を停止させて（Ｓ９）、沸き上げ制御を終了する（Ｓ１０）。
ステップＳ９で、温度センサＡ５が最高貯湯温度Ｔ_１℃（９０℃）を検出しないときは、温度センサＢ６が所定温度（６０℃）を検出したかどうかを判定し（Ｓ８）、温度センサＢ６が所定温度（６０℃）を検出しないときは温度センサＡ５が最高貯湯温度Ｔ_１℃（９０℃）を検出したかどうかの判定（Ｓ７）にもどり、温度センサＢ６が所定温度（６０℃）を検出すると、制御部８の指示でヒートポンプ本体１０の加熱動作を停止させて（Ｓ９）、次回の沸き上げを過去数日の貯湯温度に変更して、沸き上げ制御を終了する（Ｓ１０）。
ここで、加熱動作解除後の貯湯温度は、最初の１回のみ最高貯湯温度Ｔ_１℃（９０℃）に設定され、沸き上げ完了後は通常の沸き上げ温度に戻る。
【００２８】
このように、本実施の形態３によれば、過去数日の使用湯量の平均値より前日の使用湯量が所定量（例えば１００Ｌ）以上少ない場合、加熱動作停止解除後の貯湯温度は最高貯湯温度Ｔ_１℃（９０℃）に変更され、高温の湯を貯湯でき、一方、次回の沸き上げは通常の貯湯温度Ｔ_２℃（７５℃）になるので、一時的に蓄熱量を多くでき、湯切れを防止しながら、次回以降の沸き上げ運転では省エネ運転し、電気代を安価に維持できる。
【００２９】
実施の形態４．
図９は本発明の実施の形態４における制御装置のブロック図、図１０は本発明の実施の形態４における沸き上げ制御動作を示すフローチャートである。
なお、本発明の実施の形態４において、ヒートポンプ式給湯器の構成及びヒートポンプ本体の構成図はそれぞれ図１及び図１２に示した従来の構成と同一であるため、説明を省略する。
図９において、実施の形態１と異なる点は、制御部８の構成だけである。すなわち、本発明の実施の形態４においては、制御部８は、貯湯タンク２内の水の沸き上げ、及びヒートポンプの運転開始・停止を制御する他に、貯湯タンク２に貯えられる貯湯温度を状況に応じて適宜変更する貯湯温度変更手段８ａと、前日の使用湯量及び過去数日の使用湯量の平均値を記憶しておく使用湯量記憶手段８ｂと、ヒートポンプの加熱動作停止温度を変更する加熱動作停止温度変更手段８ｃと、過去数日の貯湯タンク２に蓄えられた貯湯温度を記憶する貯湯温度記憶手段８ｄとを備えている。
【００３０】
本実施の形態４におけるヒートポンプ式給湯器の沸き上げ制御動作について、図１０のフローチャートを用いて説明する。
なお、従来例と同一または相当部分については説明を省略する。
ステップＳ５で、過去数日の使用湯量の平均値よりも前日の使用湯量が所定量（例えば１００Ｌ）以上少ない場合は、、制御部８の指示で循環ポンプ７、及びヒートポンプサイクルを運転してヒートポンプ本体１０は一定の加熱能力（例えば４．５ＫＷ）で加熱動作を開始し（Ｓ６）、貯湯タンク２上部より貯湯温度変更手段８ａで最高貯湯温度Ｔ_１℃（本例の場合は、９０℃）で湯を沸き上げる（Ｓ７）。温度センサＢ６が加熱動作停止温度変更手段８ｂで加熱動作停止温度を最高加熱動作停止温度（本例の場合は、８０℃）に変更し、最高加熱動作停止温度（８０℃）を検出すると（Ｓ１３）、制御部８の指示でヒートポンプ本体１０の加熱動作を停止させて（Ｓ９）、沸き上げ制御を終了する（Ｓ１０）。
【００３１】
このように、本実施の形態４によれば、過去数日の使用湯量の平均値より前日の使用湯量が所定量（例えば１００Ｌ）以下の場合、特に全く湯を使用しなかった場合、貯湯温度は最高貯湯温度Ｔ_１℃（９０℃）に変更され、高温の湯を貯湯し、かつ、加熱動作停止温度も最高加熱動作停止温度（８０℃）に変更されるので、残湯の温度によらず貯湯タンクを一様に高温に沸き上げ、一方、次回の沸き上げは通常の貯湯温度Ｔ_２℃（７５℃）と加熱動作停止温度（６０℃）に戻るので、通常運転状態よりも確実に一時的に蓄熱量を多くでき湯切れを確実に防止しながら、次回以降の沸き上げ運転では省エネ運転して電気代を安価に維持できる。
【００３２】
【発明の効果】
以上のように、本発明に係る請求項１のヒートポンプ式給湯器によれば、過去数日の使用湯量の平均値より前日の使用湯量が所定量以上少ない場合、貯湯温度は最高貯湯温度Ｔ_１℃に変更され、高温の湯を貯湯できるので、通常運転状態よりも蓄熱量を多くでき、湯切れを防止できるヒートポンプ給湯器を得ることができる。
【００３３】
また、本発明に係る請求項２のヒートポンプ式給湯器によれば、過去数日の使用湯量の平均値より前日の使用湯量が所定量以上少ない場合、特に全く湯を使用しなかった場合、貯湯温度は最高貯湯温度Ｔ_１℃に変更され、高温の湯を貯湯し、かつ、加熱動作停止温度も最高加熱動作停止温度に変更されるので、残湯の温度によらず貯湯タンクを一様に高温に沸き上げるので、通常運転状態よりも確実に蓄熱量を多くでき、湯切れを防止できるヒートポンプ給湯器を得ることができる。
【００３４】
また、本発明に係る請求項３のヒートポンプ式給湯器によれば、過去数日の使用湯量の平均値より前日の使用湯量が所定量以上少ない場合、加熱動作停止解除後の貯湯温度は最高貯湯温度Ｔ_１℃に変更され、高温の湯を貯湯でき、一方、次回の沸き上げは通常の貯湯温度Ｔ_２℃に戻るので、一時的に蓄熱量を多くでき、湯切れを防止しながら、次回以降の沸き上げ運転では省エネ運転して電気代を安価に維持できるヒートポンプ給湯器を得ることができる。
【００３５】
また、本発明に係る請求項４のヒートポンプ式給湯器によれば、過去数日の使用湯量の平均値より前日の使用湯量が所定量以上少ない場合、特に全く湯を使用しなかった場合、貯湯温度は最高貯湯温度Ｔ_１℃に変更され、高温の湯を貯湯し、かつ、加熱動作停止温度も最高加熱動作停止温度に変更されるので、残湯の温度によらず貯湯タンクを一様に高温に沸き上げ、一方、次回の沸き上げは通常の貯湯温度と加熱動作停止温度に戻るので、通常運転状態よりも確実に一時的に蓄熱量を多くでき、湯切れを確実に防止しながら、次回以降の沸き上げ運転では省エネ運転して電気代を安価に維持できるヒートポンプ給湯器を得ることができる。
【００３６】
また、本発明に係る請求項５のヒートポンプ式給湯器の沸き上げ制御方法によれば、過去数日の使用湯量の平均値より前日の使用湯量が所定量以上少ない場合、貯湯温度は最高貯湯温度Ｔ_１℃に変更され、高温の湯を貯湯できるので、通常運転状態よりも蓄熱量を多くでき、湯切れを防止できる。
【００３７】
また、本発明に係る請求項６のヒートポンプ式給湯器の沸き上げ制御方法によれば、過去数日の使用湯量の平均値より前日の使用湯量が所定量以上少ない場合、特に全く湯を使用しなかった場合、貯湯温度は最高貯湯温度Ｔ_１℃に変更され、高温の湯を貯湯し、かつ、加熱動作停止温度も最高加熱動作停止温度に変更されるので、残湯の温度によらず貯湯タンクを一様に高温に沸き上げることができ、通常運転状態よりも確実に蓄熱量を多くでき、湯切れを防止できる。
【００３８】
また、本発明に係る請求項７のヒートポンプ式給湯器の沸き上げ制御方法によれば、過去数日の使用湯量の平均値より前日の使用湯量が所定量以上少ない場合、加熱動作停止解除後の貯湯温度は最高貯湯温度Ｔ_１℃に変更され、高温の湯を貯湯でき、一方、次回の沸き上げは通常の貯湯温度Ｔ_２℃に戻されるので、一時的に蓄熱量を多くでき、湯切れを防止しながら、次回以降の沸き上げ運転では省エネ運転して電気代を安価に維持できる。
【００３９】
また、本発明に係る請求項８のヒートポンプ式給湯器の沸き上げ制御方法によれば、過去数日の使用湯量の平均値より前日の使用湯量が所定量以上少ない場合、特に全く湯を使用しなかった場合、貯湯温度は最高貯湯温度Ｔ_１℃に変更され、高温の湯を貯湯し、かつ、加熱動作停止温度も最高加熱動作停止温度に変更されるので、残湯の温度によらず貯湯タンクを一様に高温に沸き上げ、一方、次回の沸き上げは通常の貯湯温度Ｔ_２℃と加熱動作停止温度に戻されるので、通常運転状態よりも確実に一時的に蓄熱量を多くでき、湯切れを確実に防止しながら、次回以降の沸き上げ運転では省エネ運転して電気代を安価に維持できる。
【図面の簡単な説明】
【図１】本発明の実施の形態１を示すヒートポンプ式給湯器の構成図である。
【図２】本発明の実施の形態１における制御装置のブロック図である。
【図３】本発明の実施の形態１における沸き上げ制御動作のフローチャートである。
【図４】本発明の最高貯湯温度と水温との関連を示すグラフである。
【図５】本発明の実施の形態２における制御装置のブロック図である。
【図６】本発明の実施の形態２における沸き上げ制御動作のフローチャートである。
【図７】本発明の実施の形態３における制御装置のブロック図である。
【図８】本発明の実施の形態３における沸き上げ制御動作のフローチャートである。
【図９】本発明の実施の形態４における制御装置のブロック図である。
【図１０】本発明の実施の形態４における沸き上げ制御動作のフローチャートである。
【図１１】従来のヒートポンプ式給湯器の構成図である。
【図１２】従来のヒートポンプ本体の構成図である。
【図１３】従来のヒートポンプ式給湯器の制御装置のブロック図である。
【図１４】従来のヒートポンプ式給湯器における沸き上げ制御動作のフローチャートである。
【符号の説明】
１給湯器本体、２貯湯タンク、５温度センサＡ、６温度センサＢ、８制御部、８ａ貯湯温度変更手段、８ｂ使用湯量記憶手段、８ｃ加熱動作停止温度変更手段、８ｄ貯湯温度記憶手段、１０ヒートポンプ本体。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat pump water heater using a heat pump cycle.
[0002]
[Prior art]
Recently, CO ₂ A heat pump type water heater using a refrigerant is known. This water heater has the advantage that the boiling temperature can be heated to a high temperature of 90 ° C. or higher and the heating efficiency is high. However, the temperature of the liquid in the hot water storage tank is higher than a predetermined temperature set in advance from the hygiene aspect. If the temperature of the liquid supplied to the heat pump main body increases, the heating efficiency decreases.
In addition, when the amount of hot water used is small, a large amount of hot water remains in the hot water storage tank, and the large amount of hot water in the hot water storage tank drops evenly. The temperature of the water becomes higher than the heating stop temperature and the operation is immediately stopped, and the amount of heat stored in the hot water storage tank decreases on the next day.
FIG. 11 is a block diagram of a conventional heat pump type water heater, FIG. 12 is a block diagram of a heat pump body, FIG. 13 is a block diagram of a conventional heat pump type water heater control device, and FIG. It is a flowchart of control operation.
[0003]
In FIG. 11, 1 is a hot water supply body, 2 is a hot water storage tank disposed in the main body 1, 3 is a water supply pipe connected to the lower part of the hot water storage tank 2, and 3 a is a pressure reduction provided in the water supply pipe 3. The valve 4 is a hot water supply pipe connected to the upper part of the hot water storage tank 2, 4 a is a relief valve, and 5 is a temperature sensor A that is attached to the outer wall surface of the hot water storage tank 2 and detects the temperature of water in the hot water storage tank 2. By attaching the temperature sensor A5 to a position of a predetermined capacity on the outer wall surface of the hot water storage tank 2, the remaining hot water amount in the hot water storage tank 2 is also detected from the detected temperature at the attachment position. 6 is a temperature sensor B which is attached to the lower piping of the hot water storage tank 2 and detects the temperature for stopping the heating operation of the heat pump body.
[0004]
7 is a circulation in which the water in the hot water storage tank 2 is circulated between the heat pump main body 10 by the cold water pipe 10a and the hot water pipe 10b in order to replace the heat generated in the heat cycle of the heat pump main body 10 with the water in the hot water storage tank 2. It is a pump. Water is supplied to the heat pump main body 10 by the circulation pump 7 from the cold water pipe 10a connected to the lower part of the hot water storage tank 2, and the water heated by the heat pump main body 10 is returned by the hot water pipe 10b connected to the upper part of the hot water storage tank 2. 2 Store hot water from the upper part.
[0005]
8 is a control unit for controlling the boiling of the water in the hot water storage tank 2 and the start / stop of the operation of the heat pump. From the operation unit 9 for setting the detected value and the boiling temperature of the temperature sensor A5 and the temperature sensor B6. The heating operation start / stop of the heat pump main body 10 and the operation of the circulation pump 7 are controlled based on the input value.
[0006]
In FIG. 12, the heat pump cycle of the heat pump main body 10 is configured by connecting a compressor 11, a hot water supply heat exchanger 12, an expansion valve 13, an outdoor heat exchanger 14, and an accumulator 15 through a refrigerant pipe 10 c in order. Here, a fan 16 is attached to the outdoor heat exchanger 14 to absorb heat, and the hot water supply heat exchanger 12 exchanges heat between the high-pressure gas refrigerant discharged from the compressor 11 and hot water supply water. It has a refrigerant passage 12a through which refrigerant flows and a hot water supply water passage 12b through which hot water is supplied.
[0007]
Next, a conventional boiling control operation will be described with reference to the flowchart of FIG.
First, when boiling control is started (S21), the control unit 8 detects whether or not there is a remaining amount of hot water in the hot water storage tank 2 from the detected temperature at the position where the temperature sensor A5 is attached (S22). 200L) or less (S23). If the amount of remaining hot water is equal to or greater than a predetermined amount, boiling is not performed and the flow returns to detection of the remaining hot water (S22). If the amount of remaining hot water is equal to or less than the predetermined amount (S23), the circulation pump 7 and the heat pump cycle are operated according to an instruction from the control unit 8, and the heat pump body 10 performs a heating operation with a certain heating capacity (for example, 4.5 kW). Start (S24), hot water storage temperature T set by the operation unit 9 from the upper part of the hot water storage tank 2 ₂ Hot water is boiled at ℃ (for example, 75 ℃), and the temperature sensor A5 ₂ It is determined whether or not the temperature is detected (for example, 75 ° C.) (S25), and the temperature sensor A5 is T ₂ When the temperature is detected (for example, 75 ° C.), the heating operation is stopped (S27). Temperature sensor A5 is hot water storage temperature T ₂ When the temperature sensor B6 does not detect a predetermined temperature (for example, 60 ° C.), it is determined whether or not the temperature sensor B6 detects a predetermined temperature (for example, 60 ° C.) (S26). Temperature sensor A5 is hot water storage temperature T ₂ Returning to the determination (S25) of whether or not the temperature (for example, 75 ° C.) has been detected, and when the temperature sensor B6 detects a predetermined temperature (for example, 60 ° C.), the heating operation of the heat pump body 10 is stopped by the instruction of the control unit 8 (S27) The boiling-up control is terminated (S28).
[0008]
[Problems to be solved by the invention]
The conventional heat pump type water heater detects the amount of remaining hot water in the hot water storage tank 2 from the detected temperature at the position where the temperature sensor A5 is attached, and heats the heat pump main body 10 at a predetermined temperature (for example, 75 ° C.) when it falls below a predetermined amount. When the operation is started and the temperature of the temperature sensor B6 reaches a predetermined temperature set in advance (for example, 60 ° C.), the heating operation of the heat pump body 10 is stopped. If the temperature is extremely low, the hot water temperature in the hot water storage tank 2 is uniformly reduced by about 10 ° C. (for example, the temperature of the hot water storage tank is about 65 ° C. when one day has passed). The problem is that the heating operation is stopped immediately after the remaining hot water in the hot water storage tank 2 exceeds a predetermined temperature (for example, 60 ° C.) that is set in advance, and the hot water cannot be stored in the hot water storage tank 2 and the hot water runs out. There was a point.
[0009]
The present invention has been made to solve the above problems, and a heat pump water heater that can prevent hot water shortage when the amount of hot water used on the previous day is extremely small compared to the amount of hot water used, and its An object of the present invention is to provide a boiling control method.
[0010]
[Means for Solving the Problems]
The heat pump type hot water heater according to claim 1 of the present invention heats a hot water supply liquid using a heat pump cycle, stores the heated liquid from the upper part of the hot water storage tank of the hot water supply body, and supplies the heating source from the lower part of the hot water storage tank. In the heat pump water heater that stops the heating operation when the temperature of the liquid returned to the lower part of the hot water tank or returned to the heat pump body reaches a predetermined temperature lower than the hot water temperature, the liquid stored in the hot water tank Hot water storage temperature changing means for changing hot water storage temperature as appropriate according to the situation and hot water storage means for storing the amount of hot water used for the past several days, the amount of hot water used on the previous day is more than a predetermined amount from the average value of the amount of hot water used for the past several days In the heating operation when there are few, the hot water storage temperature of the liquid stored in the hot water storage tank is changed to the maximum hot water storage temperature.
[0011]
Moreover, the heat pump type water heater according to claim 2 includes heating operation stop temperature changing means for changing the heating operation stop temperature of the heat pump, and the amount of hot water used on the previous day is less than a predetermined amount from the average value of the amount of hot water used in the past several days. In the case of the heating operation, the hot water storage temperature of the liquid stored in the hot water storage tank is changed to the maximum hot water storage temperature, and the heating operation stop temperature of the heat pump cycle is changed to the maximum heating operation stop temperature.
[0012]
Moreover, the heat pump type hot water heater according to claim 3 heats the hot water supply liquid using a heat pump cycle, stores the heated liquid from the upper part of the hot water storage tank of the main body of the hot water heater, and is a heating source from the lower part of the hot water storage tank. In the heat pump water heater that stops the heating operation when the temperature of the liquid returned to the heat pump main body and returned to the lower part of the hot water tank or the heat pump main body reaches a predetermined temperature lower than the hot water storage temperature, the hot water storage temperature of the liquid stored in the hot water storage tank Hot water storage temperature changing means for appropriately changing the hot water storage temperature according to the situation, hot water storage means for storing the hot water usage for the past several days, and hot water storage temperature storage means for storing the hot water storage temperature of the liquid stored in the hot water storage tank for the past several days In the heating operation when the amount of hot water used on the previous day is less than a predetermined amount from the average value of the amount of hot water used in the past several days, The hot water storage temperature of the liquid by changing only the maximum hot water storage temperature heating operation once for, subsequent heating operation is intended for returning the hot-water storage temperature or set the hot-water storage temperature of the past few days stored in the hot water storage temperature storage means.
[0013]
Moreover, the heat pump type hot water heater according to claim 4 includes a heating operation stop temperature changing means for changing the heating operation stop temperature of the heat pump, and the amount of hot water used on the previous day is less than a predetermined amount from the average value of the amount of hot water used in the past several days. In the case of the heating operation, the hot water storage temperature and the heating operation stop temperature of the liquid stored in the hot water storage tank are changed to the maximum hot water storage temperature and the maximum heating operation stop temperature only once, and the subsequent heating operation is stored in the hot water storage temperature storage means. The stored hot water temperature in the past several days or the set hot water storage temperature and the set heating operation stop temperature are restored.
[0014]
According to a fifth aspect of the present invention, there is provided a method for controlling the boiling of a heat pump type hot water heater, wherein a liquid for hot water supply is heated using a heat pump cycle, and the heated liquid is stored from an upper part of a hot water storage tank of a hot water supply body. In the heating control of the heat pump water heater that stops the heating operation when the temperature of the liquid returned to the heat pump main body, which is a heating source, returns to the lower part of the hot water storage tank or the heat pump main body becomes a predetermined temperature lower than the hot water storage temperature, The amount of hot water stored in the hot water storage tank is stored in the past several days, and the hot water temperature of the liquid stored in the hot water storage tank when the hot water volume of the previous day is less than a predetermined amount from the average value of the hot water usage in the past several days Change to the maximum hot water temperature and boil.
[0015]
According to a sixth aspect of the present invention, there is provided a method for controlling the boiling of a heat pump type water heater, wherein when the amount of hot water used on the previous day is less than a predetermined amount from the average value of the amount of hot water used in the past several days, Change to the maximum hot water storage temperature and boil, and change the heating operation stop temperature of the heat pump cycle to the maximum heating operation stop temperature and boil.
[0016]
According to a seventh aspect of the present invention, there is provided a method for controlling boiling of a heat pump type water heater, wherein a liquid for hot water supply is heated using a heat pump cycle, and the heated liquid is stored from an upper part of a hot water storage tank of a hot water supply body. In the heating control of the heat pump water heater that stops the heating operation when the temperature of the liquid returned to the heat pump main body, which is a heating source, returns to the lower part of the hot water storage tank or the heat pump main body reaches a predetermined temperature lower than the hot water storage temperature, Stores the amount of hot water used for several days and the hot water storage temperature of the liquid stored in the hot water storage tank for the past several days, and if the amount of hot water used on the previous day is less than a predetermined amount below the average value of the amount of hot water used for the past several days, Change the hot water storage temperature of the liquid stored in the tank to the maximum hot water storage temperature for one heating operation and boil it up. Increasing boiling back to temperature or set the hot-water storage temperature.
[0017]
The heating control method for the heat pump type hot water heater according to claim 8 is characterized in that when the amount of hot water used on the previous day is less than a predetermined amount or more than the average value of the amount of hot water used in the past several days, The heating operation stop temperature of the heat pump cycle is changed to the maximum hot water storage temperature and the maximum heating operation stop temperature only once for the heating operation, the water is boiled, and the subsequent heating operation is stored in the past several days or stored hot water temperature. Bring it back to the temperature and the heating stop temperature.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a block diagram of a heat pump type water heater showing Embodiment 1 of the present invention, FIG. 2 is a block diagram of a control device in Embodiment 1 of the present invention, and FIG. 3 is boiling in Embodiment 1 of the present invention. It is a flowchart which shows control operation.
In addition, since the block diagram of the heat pump main body in Embodiment 1 of this invention is the same as the conventional structure shown in FIG. 12, description is abbreviate | omitted.
The difference between the configuration diagram of the first embodiment of the present invention shown in FIG. 1 and the configuration diagram of the conventional heat pump type water heater shown in FIG. 12 is that the first embodiment of the present invention is used for four hot water supply pipes. Only the addition of the flow sensor 17 for detecting the amount of hot water and the configuration of the control unit 8 are provided. That is, the control unit 8 according to Embodiment 1 of the present invention controls the boiling of water in the hot water storage tank 2 and the start / stop of the heat pump as shown in the block diagram of FIG. There are provided hot water storage temperature changing means 8a for appropriately changing the hot water storage temperature stored in accordance with the situation, and used hot water storage means 8b for storing the amount of hot water used on the previous day and the average value of the amount of hot water used for the past several days.
Here, as shown in FIG. 4, the hot water storage temperature of the hot water storage tank 2 is changed according to the water temperature in the control unit 8, and the maximum hot water storage temperature (90 ° C.) when the setting in the operation unit 9 or the amount of hot water used by the user is small. ) It is boiling at the following hot water storage temperature. In the first embodiment, the hot water storage temperature changing means 8a changes the hot water storage temperature to a maximum water temperature of 90 ° C up to a water temperature of 15 ° C, and the hot water temperature is changed in inverse proportion to the water temperature in the range of 15 ° C to 25 ° C. When the water temperature is 25 ° C. or higher, the temperature is changed to 75 ° C.
[0019]
The heating control operation of the heat pump type water heater in the first embodiment will be described with reference to the flowchart of FIG.
In addition, description is abbreviate | omitted about the part which is the same as that of a prior art example, or an equivalent part.
[0020]
First, when boiling-up control is started (S1), the amount of hot water used for the past several days is read (S2) and the amount of hot water used for the previous day is read (S3). The amount of hot water used is detected by the flow sensor 17. The control unit 8 compares the average amount of hot water used in the past several days with the amount of hot water used on the previous day (S4). It is confirmed whether or not the amount of hot water used on the previous day is less than a predetermined amount (for example, 100 L) compared to the average value of the amount of hot water used in the past several days (S5).
When the difference in the amount of hot water used on the previous day is less than a predetermined amount (for example, 100 L) from the average value of the amount of hot water used in the past several days (S5), the heat pump main body is operated by operating the circulation pump 7 and the heat pump cycle in accordance with instructions from the control unit 8 10 starts a heating operation with a constant heating capacity (for example, 4.5 KW) (S11), and hot water storage temperature T set by the operation unit 9 from the upper part of the hot water storage tank 2 is reached. ₂ The water is boiled at ℃ (75 ℃ in this example), and the temperature sensor A5 ₂ It is determined whether or not ℃ (75 ℃) is detected (S12), the temperature sensor A5 is the hot water storage temperature T ₂ When the temperature is detected (75 ° C.), the heating operation is stopped (S9), and the boiling control is finished (S10).
In step S12, the temperature sensor A5 ₂ When not detecting the temperature (75 ° C.), it is determined whether or not the temperature sensor B6 has detected a predetermined temperature (for example, 60 ° C.) (S8A), and when the temperature sensor B6 does not detect the predetermined temperature (for example, 60 ° C.) Temperature sensor A5 is hot water storage temperature T ₂ Returning to the determination (S12) of whether or not the temperature has been detected (S12), and when the temperature sensor B6 detects the predetermined temperature (60 ° C) (S8A), the heating operation of the heat pump body 10 is stopped by the instruction of the control unit 8 (S9), and the boiling control is finished (S10).
On the other hand, when the amount of hot water used on the previous day is less than a predetermined amount (for example, 100 L) more than the average value of the amount of hot water used in the past several days in step S5, the circulation pump 7 and the heat pump cycle are operated according to instructions from the control unit 8. The heat pump body 10 starts a heating operation with a constant heating capacity (for example, 4.5 kW) (S6), and the hot water storage temperature variable means 8a starts the hot water storage temperature T from the upper part of the hot water storage tank 2. ₁ Hot water is boiled at ℃ (90 ℃ in this example), and the temperature sensor A5 is the maximum hot water storage temperature T ₁ It is determined whether or not ℃ (90 ℃) has been detected (S7), and the temperature sensor A5 determines the maximum hot water storage temperature T. ₁ When the temperature is detected (90 ° C.), the heating operation is stopped (S9), and the boiling control is finished (S10).
In step S9, the temperature sensor A5 determines the maximum hot water storage temperature T. ₁ When not detecting the temperature (90 ° C.), it is determined whether or not the temperature sensor B6 has detected the predetermined temperature (60 ° C.) (S8), and when the temperature sensor B6 does not detect the predetermined temperature (60 ° C.) A5 is the maximum hot water storage temperature T ₁ Returning to the determination (S7) of whether or not the temperature has been detected (S7), when the temperature sensor B6 detects the predetermined temperature (60 ° C), the heating operation of the heat pump body 10 is stopped by the instruction of the control unit 8 (S9). ), The boiling control is terminated (S10).
[0021]
As described above, according to the first embodiment, when the amount of hot water used on the previous day is less than a predetermined amount (for example, 100 L) from the average value of the amount of hot water used in the past several days, the hot water storage temperature is changed to the maximum hot water storage temperature. Since hot water can be stored, the amount of stored heat can be increased more than in the normal operation state, and hot water shortage can be prevented.
[0022]
Embodiment 2. FIG.
FIG. 5 is a block diagram of the control device according to the second embodiment of the present invention, and FIG. 6 is a flowchart showing the boiling control operation according to the second embodiment of the present invention.
In the second embodiment of the present invention, the configuration of the heat pump type hot water heater and the configuration diagram of the heat pump main body are the same as the conventional configuration shown in FIGS.
In FIG. 5, the only difference from the first embodiment is the configuration of the control unit 8. That is, in the second embodiment of the present invention, the control unit 8 controls the boiling of the water in the hot water storage tank 2 and the start / stop of the heat pump operation, as well as the hot water storage temperature stored in the hot water storage tank 2. Hot water storage temperature changing means 8a that changes appropriately according to the temperature, hot water storage means 8b that stores the average amount of hot water used the previous day and the amount of hot water used in the past several days, and heating operation that changes the heating operation stop temperature of the heat pump. Stop temperature changing means 8c.
[0023]
The heating control operation of the heat pump type water heater in Embodiment 2 will be described with reference to the flowchart of FIG.
In addition, description is abbreviate | omitted about the part which is the same as that of a prior art example, or an equivalent part.
Note that steps other than step S13 are the same as those in the first embodiment, and a description thereof is omitted.
In step S5, when the amount of hot water used on the previous day is less than a predetermined amount (for example, 100 L) more than the average value of the amount of hot water used in the past few days, the heat pump main body is operated by operating the circulation pump 7 and the heat pump cycle according to instructions from the control unit 8. 10 starts a heating operation with a certain heating capacity (for example, 4.5 kW) (S6), and the hot water storage temperature changing means 8a starts the hot water storage temperature T from the upper part of the hot water storage tank 2. ₁ Hot water is boiled at 0 ° C. (90 ° C. in this example) (S7). When the temperature sensor B6 changes the heating operation stop temperature to the maximum heating operation stop temperature (80 ° C. in this example) by the heating operation stop temperature changing means 8b and detects the maximum heating operation stop temperature (80 ° C.) (S13). ), The heating operation of the heat pump body 10 is stopped by the instruction of the control unit 8 (S9), and the boiling control is finished (S10).
[0024]
As described above, according to the second embodiment, when the amount of hot water used on the previous day is less than a predetermined amount (for example, 100 L) more than the average value of the amount of hot water used in the past several days, particularly when no hot water is used, Is set to the maximum hot water storage temperature, hot hot water is stored, and the heating operation stop temperature is also changed to the maximum heat stop temperature, so that the hot water storage tank is heated to a uniform high temperature regardless of the remaining hot water temperature. The amount of stored heat can be increased more reliably than in the normal operation state, and hot water can be prevented from running out.
[0025]
Embodiment 3 FIG.
FIG. 7 is a block diagram of the control device according to the third embodiment of the present invention, and FIG. 8 is a flowchart showing the boiling control operation according to the third embodiment of the present invention.
In Embodiment 3 of the present invention, the configuration of the heat pump type hot water heater and the configuration diagram of the heat pump main body are the same as the conventional configuration shown in FIGS.
In FIG. 7, the only difference from the first embodiment is the configuration of the control unit 8.
That is, in Embodiment 3 of the present invention, the control unit 8 controls the boiling of the water in the hot water storage tank 2 and the start / stop of the operation of the heat pump, as well as the temperature of the hot water stored in the hot water storage tank 2. Stored in the hot water storage tank 2 for the past several days, the hot water storage means 8b for storing the hot water storage temperature changing means 8a that changes appropriately according to the previous day, the hot water volume for the previous day and the average value of the hot water usage for the past several days. A hot water storage temperature storage means 8d for storing the hot water storage temperature.
[0026]
The heating control operation of the heat pump type water heater in the third embodiment will be described with reference to the flowchart of FIG.
In addition, description is abbreviate | omitted about the part which is the same as that of a prior art example, or an equivalent part.
[0027]
First, when the boiling control is started (S1), the past hot water storage temperature is read by the hot water storage temperature storage means of the control unit 8d (S14). The average amount of hot water used in the past several days is read by the hot water storage means of the controller 8b (S2), and the amount of hot water used the previous day is read (S3). The amount of hot water used is detected by the flow sensor 17. The control unit 8 compares the average amount of hot water used in the past several days with the amount of hot water used on the previous day (S4). It is confirmed whether or not the amount of hot water used on the previous day is less than a predetermined amount (for example, 100 L) compared to the average value of the amount of hot water used in the past several days (S5).
When the difference in the amount of hot water used on the previous day is less than a predetermined amount (for example, 100 L) from the average value of the amount of hot water used in the past several days (S5), the heat pump main body is operated by operating the circulation pump 7 and the heat pump cycle in accordance with instructions from the control unit 8 10 starts a heating operation with a constant heating capacity (for example, 4.5 KW) (S11), and hot water storage temperature T set by the operation unit 9 from the upper part of the hot water storage tank 2 is reached. ₂ The water is boiled at ℃ (75 ℃ in this example), and the temperature sensor A5 ₂ It is determined whether or not ℃ (75 ℃) is detected (S12), the temperature sensor A5 is the hot water storage temperature T ₂ When the temperature is detected (75 ° C.), the heating operation is stopped (S9), and the boiling control is finished (S10).
In step S12, the temperature sensor A5 ₂ When not detecting the temperature (75 ° C.), it is determined whether or not the temperature sensor B6 has detected a predetermined temperature (for example, 60 ° C.) (S8A), and when the temperature sensor B6 does not detect the predetermined temperature (for example, 60 ° C.) , Temperature sensor A5 is hot water storage temperature T ₂ Returning to the determination (S12) of whether or not the temperature has been detected (S12), and when the temperature sensor B6 detects the predetermined temperature (60 ° C) (S8A), the heating operation of the heat pump body 10 is stopped by the instruction of the control unit 8 (S9), and the boiling control is finished (S10).
On the other hand, when the amount of hot water used on the previous day is less than a predetermined amount (for example, 100 L) more than the average value of the amount of hot water used in the past several days in step S5, the circulation pump 7 and the heat pump cycle are operated according to instructions from the control unit 8. The heat pump body 10 starts a heating operation with a constant heating capacity (for example, 4.5 kW) (S6), and the hot water storage temperature variable means 8a starts the hot water storage temperature T from the upper part of the hot water storage tank 2. ₁ Hot water is boiled at ℃ (90 ℃ in this example), and the temperature sensor A5 is the maximum hot water storage temperature T ₁ It is determined whether or not ℃ (90 ℃) has been detected (S7), and the temperature sensor A5 determines the maximum hot water storage temperature T. ₁ When the temperature is detected (90 ° C.), the heating operation is stopped (S9), and the boiling control is finished (S10).
In step S9, the temperature sensor A5 determines the maximum hot water storage temperature T. ₁ When not detecting the temperature (90 ° C.), it is determined whether or not the temperature sensor B6 has detected the predetermined temperature (60 ° C.) (S8), and when the temperature sensor B6 does not detect the predetermined temperature (60 ° C.) A5 is the maximum hot water storage temperature T ₁ Returning to the determination (S7) of whether or not the temperature has been detected (S7), when the temperature sensor B6 detects the predetermined temperature (60 ° C), the heating operation of the heat pump body 10 is stopped by the instruction of the control unit 8 (S9). ), The next boiling is changed to the hot water storage temperature of the past several days, and the boiling control is terminated (S10).
Here, the hot water storage temperature after the release of the heating operation is the maximum hot water storage temperature T only for the first time. ₁ It is set to 0 ° C. (90 ° C.) and returns to the normal boiling temperature after the completion of boiling.
[0028]
Thus, according to the third embodiment, when the amount of hot water used on the previous day is less than a predetermined amount (for example, 100 L) from the average value of the amount of hot water used in the past several days, the hot water storage temperature after the heating operation stop is released is the maximum hot water storage temperature. T ₁ Changed to ℃ (90 ℃), hot water can be stored, while the next boiling is the normal hot water temperature T ₂ Since it becomes ℃ (75 ℃), the amount of heat storage can be temporarily increased, and while preventing hot water from running out, energy saving operation can be performed in the subsequent boiling operation, and the electricity bill can be maintained at a low cost.
[0029]
Embodiment 4 FIG.
FIG. 9 is a block diagram of a control device according to Embodiment 4 of the present invention, and FIG. 10 is a flowchart showing a boiling-up control operation according to Embodiment 4 of the present invention.
In addition, in Embodiment 4 of this invention, since the structure of a heat pump type water heater and the block diagram of a heat pump main body are the same as the conventional structure shown in FIG.1 and FIG.12, respectively, description is abbreviate | omitted.
In FIG. 9, the only difference from the first embodiment is the configuration of the control unit 8. That is, in the fourth embodiment of the present invention, the control unit 8 controls the boiling of the water in the hot water storage tank 2 and the start / stop of the operation of the heat pump, as well as the temperature of the hot water stored in the hot water storage tank 2. Hot water storage temperature changing means 8a that changes appropriately according to the temperature, hot water storage means 8b that stores the average amount of hot water used the previous day and the amount of hot water used in the past several days, and heating operation that changes the heating operation stop temperature of the heat pump. A stop temperature changing means 8c and a hot water storage temperature storage means 8d for storing the hot water temperature stored in the hot water storage tank 2 for the past several days are provided.
[0030]
The heating control operation of the heat pump type water heater in the fourth embodiment will be described with reference to the flowchart of FIG.
In addition, description is abbreviate | omitted about the part which is the same as that of a prior art example, or an equivalent part.
In step S5, when the amount of hot water used on the previous day is less than a predetermined amount (for example, 100L) than the average value of the amount of hot water used in the past several days, the heat pump is operated by operating the circulation pump 7 and the heat pump cycle according to the instruction of the control unit 8. The main body 10 starts a heating operation with a constant heating capacity (for example, 4.5 kW) (S6), and the hot water storage temperature changing means 8a starts the hot water storage temperature T from the upper part of the hot water storage tank 2. ₁ Hot water is boiled at 0 ° C. (90 ° C. in this example) (S7). When the temperature sensor B6 changes the heating operation stop temperature to the maximum heating operation stop temperature (80 ° C. in this example) by the heating operation stop temperature changing means 8b and detects the maximum heating operation stop temperature (80 ° C.) (S13). ), The heating operation of the heat pump body 10 is stopped by the instruction of the control unit 8 (S9), and the boiling control is finished (S10).
[0031]
Thus, according to the fourth embodiment, when the amount of hot water used on the previous day is less than a predetermined amount (for example, 100 L) from the average value of the amount of hot water used in the past several days, particularly when no hot water is used, Is the maximum hot water storage temperature T ₁ The temperature is changed to ℃ (90 ℃), hot water is stored, and the heating operation stop temperature is also changed to the maximum heating operation stop temperature (80 ℃). On the other hand, the next boiling is the normal hot water storage temperature T ₂ Since it returns to ℃ (75 ℃) and the heating operation stop temperature (60 ℃), it can temporarily increase the amount of heat storage more than in the normal operation state and reliably prevent the hot water from running out. You can drive and keep your electricity bill cheap.
[0032]
【The invention's effect】
As described above, according to the heat pump type water heater of the first aspect of the present invention, when the amount of hot water used on the previous day is less than a predetermined amount from the average value of the amount of hot water used in the past several days, the hot water storage temperature is the maximum hot water storage temperature T. ₁ Since it is changed to ° C. and hot water can be stored, it is possible to obtain a heat pump water heater that can increase the amount of heat storage compared to the normal operation state and prevent hot water from running out.
[0033]
According to the heat pump type water heater of claim 2 according to the present invention, when the amount of hot water used on the previous day is less than a predetermined amount or more than the average value of the amount of hot water used in the past several days, especially when no hot water is used at all, The maximum hot water storage temperature T ₁ Since it is changed to ℃, hot water is stored, and the heating operation stop temperature is also changed to the maximum heating operation stop temperature, the hot water storage tank is boiled uniformly to a high temperature regardless of the remaining hot water temperature. It is possible to obtain a heat pump water heater that can increase the amount of stored heat more reliably than the operating state and prevent hot water from running out.
[0034]
According to the heat pump type water heater of claim 3 according to the present invention, when the amount of hot water used on the previous day is less than a predetermined amount more than the average value of the amount of hot water used in the past several days, the hot water storage temperature after the release of the heating operation stop is the highest hot water storage temperature. Temperature T ₁ Changed to ℃, hot water can be stored, while the next boiling is the normal hot water temperature T ₂ Since it returns to ° C., it is possible to obtain a heat pump water heater that can temporarily increase the amount of stored heat and prevent running out of hot water, and that can save energy during the subsequent boiling operation and maintain the electricity bill at low cost.
[0035]
According to the heat pump type water heater of claim 4 according to the present invention, when the amount of hot water used on the previous day is less than a predetermined amount or more than the average value of the amount of hot water used in the past several days, particularly when no hot water is used at all, The maximum hot water storage temperature T ₁ It is changed to ℃, hot water is stored, and the heating operation stop temperature is also changed to the maximum heating operation stop temperature, so that the hot water storage tank is uniformly boiled up regardless of the remaining hot water temperature, Since the next boiling will return to the normal hot water storage temperature and the heating operation stop temperature, the amount of heat storage can be increased temporarily more reliably than in the normal operation state, and hot water can be reliably prevented from running out. It is possible to obtain a heat pump water heater that can save energy by operating at low cost.
[0036]
According to the heating control method for a heat pump water heater of claim 5 according to the present invention, when the amount of hot water used on the previous day is less than a predetermined amount from the average value of the amount of hot water used in the past several days, the hot water storage temperature is the maximum hot water storage temperature. T ₁ Since the temperature is changed to ° C. and hot water can be stored, the amount of stored heat can be increased more than in the normal operation state, and hot water can be prevented from running out.
[0037]
According to the heating control method for a heat pump type water heater according to claim 6 of the present invention, when the amount of hot water used on the previous day is less than a predetermined amount from the average value of the amount of hot water used in the past several days, particularly hot water is used. If not, the hot water storage temperature is the maximum hot water storage temperature T ₁ It is changed to ℃, hot water is stored, and the heating operation stop temperature is also changed to the maximum heating operation stop temperature, so that the hot water storage tank can be heated to a high temperature regardless of the remaining hot water temperature. The amount of stored heat can be surely increased as compared with the normal operation state, and hot water shortage can be prevented.
[0038]
According to the heating control method of the heat pump type water heater of claim 7 according to the present invention, when the amount of hot water used on the previous day is smaller than the average value of the amount of hot water used in the past several days, Hot water storage temperature is the maximum hot water storage temperature T ₁ Changed to ℃, hot water can be stored, while the next boiling is the normal hot water temperature T ₂ Since the temperature is returned to ° C., the amount of stored heat can be temporarily increased, and while preventing hot water from running out, energy saving operation can be performed in the subsequent boiling operation to maintain the electricity cost at a low cost.
[0039]
According to the heating control method for a heat pump water heater of claim 8 according to the present invention, when the amount of hot water used on the previous day is less than a predetermined amount from the average value of the amount of hot water used in the past several days, particularly hot water is used. If not, the hot water storage temperature is the maximum hot water storage temperature T ₁ It is changed to ℃, hot water is stored, and the heating operation stop temperature is also changed to the maximum heating operation stop temperature, so that the hot water storage tank is uniformly boiled up regardless of the remaining hot water temperature, Next boiling is normal hot water storage temperature T ₂ Because the temperature is returned to ℃ and the heating operation stop temperature, the amount of heat storage can be increased temporarily and reliably compared to the normal operation state, and hot water is surely prevented from running out. It can be kept inexpensive.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a configuration diagram of a heat pump type water heater showing Embodiment 1 of the present invention.
FIG. 2 is a block diagram of a control device according to Embodiment 1 of the present invention.
FIG. 3 is a flowchart of a boiling control operation in Embodiment 1 of the present invention.
FIG. 4 is a graph showing the relationship between the maximum hot water storage temperature and the water temperature according to the present invention.
FIG. 5 is a block diagram of a control device according to Embodiment 2 of the present invention.
FIG. 6 is a flowchart of a boiling control operation in Embodiment 2 of the present invention.
FIG. 7 is a block diagram of a control device according to Embodiment 3 of the present invention.
FIG. 8 is a flowchart of a boiling control operation in Embodiment 3 of the present invention.
FIG. 9 is a block diagram of a control device according to Embodiment 4 of the present invention.
FIG. 10 is a flowchart of a boiling control operation in Embodiment 4 of the present invention.
FIG. 11 is a configuration diagram of a conventional heat pump type water heater.
FIG. 12 is a configuration diagram of a conventional heat pump main body.
FIG. 13 is a block diagram of a control device for a conventional heat pump type water heater.
FIG. 14 is a flowchart of a boiling control operation in a conventional heat pump type water heater.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hot water heater main body, 2 Hot water storage tank, 5 Temperature sensor A, 6 Temperature sensor B, 8 Control part, 8a Hot water storage temperature change means, 8b Hot water usage storage means, 8c Heating operation stop temperature change means, 8d Hot water storage temperature storage means, 10 Heat pump body.

Claims

Heat the liquid for hot water supply using a heat pump cycle, store the heated liquid from the upper part of the hot water storage tank of the water heater body, return it from the lower part of the hot water tank to the heat pump main body that is the heating source, and return it to the lower part of the hot water tank or the heat pump main body. Hot water storage temperature changing means for appropriately changing the hot water storage temperature of the liquid stored in the hot water storage tank according to the situation in a heat pump hot water heater that stops the heating operation when the temperature of the liquid reaches a predetermined temperature lower than the hot water storage temperature. A hot water storage means for storing the amount of hot water used for the past several days, and a liquid hot water stored in a hot water storage tank in a heating operation when the amount of hot water used on the previous day is less than a predetermined amount from the average value of the amount of hot water used for the past several days A heat pump water heater characterized by changing the temperature to the maximum hot water storage temperature.

A heating operation stop temperature changing means for changing the heating operation stop temperature of the heat pump is provided, and the liquid stored in the hot water storage tank in the heating operation when the amount of hot water used on the previous day is less than a predetermined amount from the average value of the amount of hot water used in the past several days. The heat pump type hot water heater according to claim 1, wherein the hot water storage temperature is changed to the maximum hot water storage temperature, and the heating operation stop temperature of the heat pump cycle is changed to the maximum heating operation stop temperature.

Heat the liquid for hot water supply using a heat pump cycle, store the heated liquid from the upper part of the hot water storage tank of the water heater body, return it from the lower part of the hot water tank to the heat pump main body that is the heating source, and return it to the lower part of the hot water tank or the heat pump main body. Hot water storage temperature changing means for appropriately changing the hot water storage temperature of the liquid stored in the hot water storage tank according to the situation in a heat pump hot water heater that stops the heating operation when the temperature of the liquid reaches a predetermined temperature lower than the hot water storage temperature. A hot water storage means for storing the amount of hot water used for the past several days, and a hot water storage temperature storage means for storing the hot water storage temperature of the liquid stored in the hot water storage tank for the past several days, In the heating operation when the amount of hot water used on the previous day is less than the predetermined amount, the hot water storage temperature of the liquid stored in the hot water storage tank is the highest only once. Change the water temperature, since the heating operation the heat pump type water heater and returning the hot-water storage temperature or set the hot-water storage temperature of the past few days stored in the hot water storage temperature storage means.

A heating operation stop temperature changing means for changing the heating operation stop temperature of the heat pump is provided, and the liquid stored in the hot water storage tank in the heating operation when the amount of hot water used on the previous day is less than a predetermined amount from the average value of the amount of hot water used in the past several days. The hot water storage temperature and the heating operation stop temperature are changed to the maximum hot water storage temperature and the maximum heating operation stop temperature only once for the heating operation, and the subsequent heating operation is the hot water storage temperature for the past several days stored in the hot water storage means or the set hot water storage. 4. The heat pump type water heater according to claim 3, wherein the temperature is set back to the heating operation stop temperature set.

Heat the liquid for hot water supply using a heat pump cycle, store the heated liquid from the upper part of the hot water storage tank of the water heater body, return it from the lower part of the hot water tank to the heat pump main body that is the heating source, and return it to the lower part of the hot water tank or the heat pump main body. In the boiling control of the heat pump water heater that stops the heating operation when the temperature of the liquid reaches a preset predetermined temperature lower than the hot water temperature, the amount of hot water used in the past several days stored in the hot water storage tank is stored, Boiling of a heat pump water heater, wherein the hot water storage temperature of the liquid stored in the hot water storage tank is changed to the maximum hot water storage temperature when the hot water usage of the previous day is less than a predetermined amount than the average value of the hot water usage of the past few days Raising control method.

When the amount of hot water used on the previous day is less than the specified amount of hot water used over the past few days, the hot water storage temperature of the liquid stored in the hot water storage tank is changed to the maximum hot water storage temperature, and the heating operation stop temperature of the heat pump cycle is heated to the maximum. The heating control method for a heat pump type water heater according to claim 5, wherein the heating temperature is changed to the operation stop temperature.

Heat the liquid for hot water supply using a heat pump cycle, store the heated liquid from the upper part of the hot water storage tank of the water heater body, return it from the lower part of the hot water tank to the heat pump main body that is the heating source, and return it to the lower part of the hot water tank or the heat pump main body. In boiling-up control of a heat pump water heater that stops the heating operation when the temperature of the liquid reaches a predetermined temperature lower than the hot water storage temperature, the amount of hot water used in the past few days and the amount of liquid stored in the hot water storage tank in the past several days The hot water storage temperature is stored, and when the amount of hot water used on the previous day is less than a predetermined amount more than the average value of the amount of hot water used in the past several days, the hot water storage temperature of the liquid stored in the hot water storage tank is set to the maximum hot water storage temperature only once in the heating operation. The heat pump type hot water heater is changed and the subsequent heating operation is returned to the stored hot water temperature of the past several days or the set hot water temperature. Up control method can.

When the amount of hot water used on the previous day is less than a predetermined amount than the average value of the amount of hot water used in the past few days, the hot water storage temperature of the liquid stored in the hot water storage tank and the heating operation stop temperature of the heat pump cycle are heated only once. 8. The heat pump hot water supply according to claim 7, wherein the heat pump hot water supply is changed to the heating operation stop temperature, and the subsequent heating operation is returned to the stored hot water storage temperature for the past several days or the set hot water storage temperature and the heating operation stop temperature. Control method of boiling water.