JP3992191B2

JP3992191B2 - Heat pump water heater

Info

Publication number: JP3992191B2
Application number: JP2003006279A
Authority: JP
Inventors: 佳嗣藤本; 芳久浦川
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 2003-01-14
Filing date: 2003-01-14
Publication date: 2007-10-17
Anticipated expiration: 2023-01-14
Also published as: JP2004218923A

Description

【０００１】
【発明の属する技術分野】
本発明は、冷凍サイクルを有するヒートポンプユニットと、給湯タンクを有する給湯ユニットと、温水配管を備えた空調機器からなる暖房ユニットとを備え、給湯用熱交換器として、給湯タンクの水と熱交換する第１の給湯用熱交換器と、暖房ユニットの熱源側熱交換器として用いる第２の給湯用熱交換器を有するヒートポンプ式給湯機に関する。
【０００２】
【従来の技術】
従来より、冷凍サイクルを用いたヒートポンプ式給湯機が提案されており、例えば冷凍サイクルを利用して給湯タンク内に温水を貯留するものや、浴槽への給湯を行うものが提案されている（例えば特許文献１、特許文献２参照）。
【０００３】
【特許文献１】
特開２００２−１３０８１９号公報
【特許文献２】
特開２００２−２４３２７４号公報
【０００４】
【発明が解決しようとする課題】
一方、近年二酸化炭素を冷媒として用いた冷凍サイクルが提案されはじめ、二酸化炭素を冷媒として用い、臨界圧を越える圧力で運転することで、高温の熱を利用することができるようになり、貯湯や給湯だけでなく暖房機器の熱源としての利用が望まれている。
しかし、貯湯や給湯機能以外に、暖房機器の熱源として利用するためには、冷凍サイクルの負担が大きく、安定した熱源の供給は困難である。
【０００５】
そこで、本発明は、暖房運転を安定して継続できるヒートポンプ式給湯機を提供することを目的とする。
特に本発明は、暖房運転に給湯タンク内の温水を利用するとともに、給湯タンク内に必要量の温水が貯留していない場合でも、暖房運転を継続することができるヒートポンプ式給湯機を提供することを目的とする。
また本発明は、給湯用熱交換器を利用した暖房運転を行いながら、給湯用タンク内に温水を貯留することができる給湯機を提供することを目的とする。
【０００６】
【課題を解決するための手段】
請求項１記載の本発明のヒートポンプ式給湯機は、圧縮機、給湯用熱交換器、膨張弁、及び熱源側熱交換器を配管で接続した冷凍サイクルを有するヒートポンプユニットと、給湯タンクを有する給湯ユニットと、温水配管を備えた床暖房装置、温風装置、乾燥装置、又は除湿装置などの空調機器からなる暖房ユニットとを備え、前記給湯用熱交換器として、前記給湯タンクの水と熱交換する第１の給湯用熱交換器と、前記暖房ユニットの熱源側熱交換器として用いる第２の給湯用熱交換器とを有するヒートポンプ式給湯機であって、前記熱源側熱交換器を蒸発器として用い、前記第１の給湯用熱交換器を用いて前記給湯タンク内に温水を貯留する貯湯運転モードと、前記第１の給湯用熱交換器に前記給湯タンク内の温水を導いて前記第１の給湯用熱交換器を蒸発器として用いて温水から冷媒に熱を放熱し、前記第２の給湯用熱交換器を用いて前記暖房ユニットを運転する第１の暖房運転モードと、前記熱源側熱交換器を蒸発器として用い、前記第２の給湯用熱交換器を用いて前記暖房ユニットを運転する第２の暖房運転モードと、前記熱源側熱交換器を蒸発器として用い、前記第２の給湯用熱交換器を用いて前記暖房ユニットを運転し、さらに前記第１の給湯用熱交換器を用いて前記給湯タンク内に温水を貯留する暖房貯湯運転モードとを有し、前記暖房貯湯運転モードでは、前記第１の給湯用熱交換器よりも前記第２の給湯用熱交換器を前記圧縮機の吐出側に配置させて運転することを特徴とする。
請求項２記載の本発明は、請求項１に記載のヒートポンプ式給湯機において、前記第１の暖房運転モードでは、前記給湯タンクの中間部から温水を流出させ、前記第１の給湯用熱交換器で放熱させた温水を、前記給湯タンクの下部から流入させることを特徴とする。
請求項３記載の本発明は、請求項１または請求項２に記載のヒートポンプ式給湯機において、前記第１の暖房運転モードでは、前記給湯タンクから前記第１の給湯用熱交換器に流入させる温水の温度を、所定の温度範囲となるように制御することを特徴とする。
請求項４記載の本発明は、請求項１から請求項３のいずれかに記載のヒートポンプ式給湯機において、前記第１の暖房運転モードにおいて、前記給湯タンクの中間部から中温水を、前記給湯タンクの下部から低温水を流出させ、前記中温水と前記低温水とを混合することを特徴とする。
請求項５記載の本発明は、請求項１から請求項４のいずれかに記載のヒートポンプ式給湯機において、前記第１の暖房運転モードにおいて、前記給湯タンクから前記第１の給湯用熱交換器に流入させる温水の流量を変更することを特徴とする。
請求項６記載の本発明は、請求項２から請求項５のいずれかに記載のヒートポンプ式給湯機において、前記第１の暖房運転モードにおいて、前記給湯タンクからの流出位置を変更することを特徴とする。
請求項７記載の本発明は、請求項１から請求項６のいずれかに記載のヒートポンプ式給湯機において、前記給湯タンク内の温水温度が所定値よりも低い場合に、前記暖房貯湯運転モードを行うことを特徴とする。
請求項８記載の本発明は、請求項１から請求項７のいずれかに記載のヒートポンプ式給湯機において、前記暖房貯湯運転モードでは、前記第２の給湯用熱交換器の出口側の冷媒温度を所定温度に維持するように、前記第２の給湯用熱交換器の利用側配管を流れる水の流量を変更することを特徴とする。
請求項９記載の本発明は、請求項１から請求項８のいずれかに記載のヒートポンプ式給湯機において、外気温度が所定値よりも低い場合に、前記第１の暖房運転モードを行うことを特徴とする。
請求項１０記載の本発明は、請求項１から請求項９のいずれかに記載のヒートポンプ式給湯機において、前記貯湯運転モードでは、前記第２の給湯用熱交換器に冷凍サイクルの冷媒を流さないことを特徴とする。
請求項１１記載の本発明は、請求項１から請求項１０のいずれかに記載のヒートポンプ式給湯機において、前記第２の暖房運転モードでは、前記第１の給湯用熱交換器に冷凍サイクルの冷媒を流さないことを特徴とする。
請求項１２記載の本発明は、請求項１から請求項１１のいずれかに記載のヒートポンプ式給湯機において、前記利用側配管をバイパスするバイパス配管を設け、前記バイパス配管に混合弁を設けたことを特徴とする。
請求項１３記載の本発明は、請求項１から請求項１２のいずれかに記載のヒートポンプ式給湯機において、前記第１の暖房運転モードにおいて、前記第１の給湯用熱交換器に導く温水温度が所定温度以下となった場合には、前記第２の暖房運転モードに切り替えることを特徴とする。
請求項１４記載の本発明は、請求項１から請求項１３のいずれかに記載のヒートポンプ式給湯機において、浴槽内の浴槽水を加熱する沸上手段を設け、前記沸上手段を、前記浴槽内の浴槽水を浴槽用熱交換器に導き、前記浴槽用熱交換器で加熱された温水を前記浴槽に導く浴槽用配管と、前記浴槽用配管内の温水を循環させる循環ポンプとによって構成したことを特徴とする。
請求項１５記載の本発明は、請求項１から請求項１４のいずれかに記載のヒートポンプ式給湯機において、前記冷凍サイクルに用いる冷媒を二酸化炭素とし、高圧側では臨界圧を越える状態で運転することを特徴とする。
【０００７】
【発明の実施の形態】
本発明による第１の実施の形態によるヒートポンプ式給湯機は、熱源側熱交換器を蒸発器として用い、第１の給湯用熱交換器を用いて給湯タンク内に温水を貯留する貯湯運転モードと、第１の給湯用熱交換器に給湯タンク内の温水を導いて第１の給湯用熱交換器を蒸発器として用いて温水から冷媒に熱を放熱し、第２の給湯用熱交換器を用いて暖房ユニットを運転する第１の暖房運転モードと、熱源側熱交換器を蒸発器として用い、第２の給湯用熱交換器を用いて暖房ユニットを運転する第２の暖房運転モードと、熱源側熱交換器を蒸発器として用い、第２の給湯用熱交換器を用いて暖房ユニットを運転し、さらに第１の給湯用熱交換器を用いて給湯タンク内に温水を貯留する暖房貯湯運転モードとを有し、暖房貯湯運転モードでは、第１の給湯用熱交換器よりも第２の給湯用熱交換器を圧縮機の吐出側に配置するものである。本実施の形態によれば、貯湯運転モードと、第１の給湯用熱交換器を蒸発器として用いる第１の暖房運転モードと、熱源側熱交換器を蒸発器として用いる第２の暖房運転モードと、第２の給湯用熱交換器及び第１の給湯用熱交換器を用いる暖房貯湯運転モードとを行うことができる。また、本実施の形態によれば、暖房貯湯運転モードでは、第１の給湯用熱交換器よりも第２の給湯用熱交換器を圧縮機の吐出側に配置することで、暖房運転を優先し、暖房能力を維持することができる。
本発明による第２の実施の形態は、第１の実施の形態によるヒートポンプ式給湯機において、第１の暖房運転モードでは、給湯タンクの中間部から温水を流出させ、前記第１の給湯用熱交換器で放熱させた温水を、前記給湯タンクの下部から流入させるものである。本実施の形態によれば、貯湯運転モードと、第１の給湯用熱交換器を蒸発器として用いる第１の暖房運転モードとを行うことができる。また、本実施の形態によれば、第１の暖房運転モードでは、給湯タンクの中間部から温水を流出させることで給湯タンクの上部に常に高温水を蓄えておくことができ、第１の給湯用熱交換器で放熱させた温水を給湯タンクの下部から流入させることで、給湯タンク内で低温水が混ざり合うことを防止できる。
本発明による第３の実施の形態は、第１または第２の実施の形態によるヒートポンプ式給湯機において、第１の暖房運転モードでは、給湯タンクから第１の給湯用熱交換器に流入させる温水の温度を、所定の温度範囲となるように制御するものである。本実施の形態によれば、貯湯運転モードと、第１の給湯用熱交換器を蒸発器として用いる第１の暖房運転モードとを行うことができる。また、本実施の形態によれば、第１の暖房運転モードでは、給湯タンクから第１の給湯用熱交換器に流入させる温水の温度を、所定の温度範囲となるように制御することで、第１の給湯用熱交換器で高い熱交換効率を維持することができる。
本発明による第４の実施の形態は、第１から第３の実施の形態によるヒートポンプ式給湯機において、第１の暖房運転モードにおいて、給湯タンクの中間部から中温水を、給湯タンクの下部から低温水を流出させ、中温水と低温水とを混合するものである。本実施の形態によれば、給湯タンク内の中温水と低温水とを混合することで第１の給湯用熱交換器に流入させる温水の温度を、所定の温度範囲となるように制御することができる。
本発明による第５の実施の形態は、第１から第４の実施の形態によるヒートポンプ式給湯機において、第１の暖房運転モードにおいて、給湯タンクから第１の給湯用熱交換器に流入させる温水の流量を変更するものである。本実施の形態によれば、給湯タンクから第１の給湯用熱交換器に流入させる温水の流量を変更することで第１の給湯用熱交換器に流入させる温水の温度を、所定の温度範囲となるように制御することができる。
本発明による第６の実施の形態は、第２から第５の実施の形態によるヒートポンプ式給湯機において、第１の暖房運転モードにおいて、給湯タンクからの流出位置を変更するものである。本実施の形態によれば、給湯タンクからの流出位置を変更することで第１の給湯用熱交換器に流入させる温水の温度を、所定の温度範囲となるように制御することができる。
本発明による第７の実施の形態は、第１から第６の実施の形態によるヒートポンプ式給湯機において、給湯タンク内の温水温度が所定値よりも低い場合に、暖房貯湯運転モードを行うものである。本実施の形態によれば、貯湯運転モードと、熱源側熱交換器を蒸発器として用いる第２の暖房運転モードと、第２の給湯用熱交換器及び第１の給湯用熱交換器を用いる暖房貯湯運転モードとを行うことができる。また、本実施の形態によれば、給湯タンク内の温水温度が低い場合に、暖房運転を行いながら給湯タンク内にも温水を蓄えることができる。
本発明による第８の実施の形態は、第１から第７の実施の形態によるヒートポンプ式給湯機において、暖房貯湯運転モードでは、第２の給湯用熱交換器の出口側の冷媒温度を所定温度に維持するように、第２の給湯用熱交換器の利用側配管を流れる水の流量を変更するものである。本実施の形態によれば、貯湯運転モードと、熱源側熱交換器を蒸発器として用いる第２の暖房運転モードと、第２の給湯用熱交換器及び第１の給湯用熱交換器を用いる暖房貯湯運転モードとを行うことができる。また、本実施の形態によれば、第２の給湯用熱交換器の利用側配管を流れる水の流量を変更することで、給湯タンクへの温水蓄積を安定して行える。
本発明による第９の実施の形態は、第１から第８の実施の形態によるヒートポンプ式給湯機において、外気温度が所定値よりも低い場合に、第１の暖房運転モードを行うものである。本実施の形態によれば、外気温度が低い場合に、給湯タンク内の温水を利用した第１の暖房運転モードを優先するために、高い暖房効率で運転することができる。
本発明による第１０の実施の形態は、第１から第９の実施の形態によるヒートポンプ式給湯機において、貯湯運転モードでは、第２の給湯用熱交換器に冷凍サイクルの冷媒を流さないものである。本実施の形態によれば、第２の給湯用熱交換器の利用側配管でスケールが生じることを防止することができる。
本発明による第１１の実施の形態は、第１から第 1 ０の実施の形態によるヒートポンプ式給湯機において、第２の暖房運転モードでは、第１の給湯用熱交換器に冷凍サイクルの冷媒を流さないものである。本実施の形態によれば、第１の給湯用熱交換器の利用側配管でスケールが生じることを防止することができる。
本発明による第１２の実施の形態は、第１から第１１の実施の形態によるヒートポンプ式給湯機において、利用側配管をバイパスするバイパス配管を設け、バイパス配管に混合弁を設けたものである。本実施の形態によれば、暖房ユニット側を流れる温水量を変更することなく、第２の給湯用熱交換器の利用側配管を流れる温水量を変更することができる。
本発明による第１３の実施の形態は、第１から第１２の実施の形態によるヒートポンプ式給湯機において、第１の暖房運転モードにおいて、第１の給湯用熱交換器に導く温水温度が所定温度以下となった場合には、第２の暖房運転モードに切り替えるものである。本実施の形態によれば、給湯タンク内の温水を利用した暖房運転を優先しつつ、給湯タンク内の温水が不足した場合にも暖房運転を継続することができる。
本発明による第１４の実施の形態は、第１から第１３の実施の形態によるヒートポンプ式給湯機において、浴槽内の浴槽水を加熱する沸上手段を設け、沸上手段を、浴槽内の浴槽水を浴槽用熱交換器に導き、浴槽用熱交換器で加熱された温水を浴槽に導く浴槽用配管と、浴槽用配管内の温水を循環させる循環ポンプとによって構成したものである。本実施の形態によれば、暖房用熱交換器を用いた暖房運転中に、浴槽の沸き上げを行うことができる。
本発明による第１５の実施の形態は、第１から第１４の実施の形態によるヒートポンプ式給湯機において、冷凍サイクルに用いる冷媒を二酸化炭素とし、高圧側では臨界圧を越える状態で運転するものである。本実施の形態によれば、二酸化炭素を冷媒として用いることで給湯機を高温で利用することができ、貯湯機能や沸上機能を向上することができる。
【０００８】
【実施例】
以下、本発明の一実施例によるヒートポンプ式給湯機について図面を用いて説明する。
図１から図８は、本実施例によるヒートポンプ式給湯機の回路構成図である。
本実施例によるヒートポンプ式給湯機は、給湯ユニット１０と、ヒートポンプユニット６０と、暖房ユニット８０とから構成される。
給湯ユニット１０は、温水を貯留する給湯タンク１１と、給湯タンク１１の低温水をヒートポンプユニット６０に導き、このヒートポンプユニット６０で加熱した温水を給湯タンク１１に戻すための循環ポンプ１２とを備えている。
ヒートポンプユニット６０は、圧縮機６１、第１の給湯用熱交換器６２Ａ、第２の給湯用熱交換器６２Ｂ、制御弁６６、熱源側熱交換器６４を配管にて接続し、冷凍サイクルを構成している。
第１の給湯用熱交換器６２Ａは、冷凍サイクルを構成する熱源側配管と給湯ユニット１０を構成する利用側配管との間で熱交換を行う。
第２の給湯用熱交換器６２Ｂは、冷凍サイクルを構成する熱源側配管と暖房ユニット８０を構成する利用側配管との間で熱交換を行う。制御弁６６Ａは圧縮機６１の吐出側と第２の給湯用熱交換器６２Ｂとの間の配管に、制御弁６６Ｂは第２の給湯用熱交換器６２Ｂと第１の給湯用熱交換器６２Ａとの間の配管に、制御弁６６Ｃは第１の給湯用熱交換器６２Ａと熱源側熱交換器６４との間の配管に、制御弁６６Ｄは熱源側熱交換器６４と圧縮機６１の吸入側との間の配管にそれぞれ設けられている。制御弁６６Ｅは、一端が制御弁６６Ｄと圧縮機６１の吸入側との間の配管に、他端が制御弁６６Ａと第２の給湯用熱交換器６２Ｂとの間の配管に、それぞれが接続された配管に設けられている。制御弁６６Ｆと制御弁６６Ｇとは、一端が第２の給湯用熱交換器６２Ｂと制御弁６６Ｂとの間の配管に、他端が第１の給湯用熱交換器６２Ａと制御弁６６Ｃとの間の配管に、それぞれが接続された配管に設けられている。制御弁６６Ｈは、一端が圧縮機６１の吐出側と制御弁６６Ａとの間の配管に、他端が制御弁６６Ｂと第１の給湯用熱交換器６２Ａとの間の配管に、それぞれが接続された配管に設けられている。制御弁６６Ｉは、一端が制御弁６６Ｆと制御弁６６Ｇとの間の配管に、他端が熱源側熱交換器６４と制御弁６６Ｄとの間の配管に、それぞれが接続された配管に設けられている。これら制御弁６０は、それぞれの配管を流れる冷媒の流通を阻止する機能とともに膨張弁として機能する場合もある。
また、圧縮機６１の吐出側配管には温度センサ９６Ａが、第２の給湯用熱交換器６２Ｂと制御弁６６Ｂとの間の配管には温度センサ９６Ｂが設けられている。
第１の給湯用熱交換器６２Ａや第２の給湯用熱交換器６２Ｂの利用側配管側で高温水を得るためには、冷凍サイクルは、冷媒として二酸化炭素を用い、臨界圧を越える圧力で運転することが好ましい。
暖房ユニット８０は、例えば温水配管を備えた床暖房装置、温風装置、乾燥装置、又は除湿装置など主に暖房機能を備えた空調機器からなるユニットである。暖房ユニット８０は、第２の給湯用熱交換器６２Ｂの利用側配管と循環ポンプ１４とともに、利用側配管４９にて環状に接続した温水回路を備えている。利用側配管４９には、第２の給湯用熱交換器６２Ｂをバイパスするバイパス配管を有し、このバイパス配管に混合弁７７Ａを設けている。また利用側配管４９には、第２の給湯用熱交換器６２Ｂへの流量を制御する流量制御弁７８と、温度センサ９７Ａが設けられている。
【０００９】
給湯ユニット１０は、給湯タンク１１を備えている。
給湯用配管４１は、一端が給湯タンク１１の底部に接続され、第１の給湯用熱交換器６２Ａの利用側配管を構成し、他端が給湯タンク１１の上部に接続され、管路中に循環ポンプ１２を備えている。給湯用配管４１の給湯タンク１１との接続部から循環ポンプ１２までの配管には、混合弁の機能を備えた三方弁３５が設けられている。この三方弁３５の流入側接続口には、給湯タンク１１の中間部を接続部とした配管５８が接続されている。一方、給湯用配管４１の他端側には、三方弁３４が設けられ、この三方弁３４の流出側接続口には、給湯タンク１１の下部を接続部とした下部戻し管５７が接続されている。
二方弁２４は、一方に水道管等の水供給配管を接続し、他方に給湯ユニット１０内の出水配管４３を接続している。
混合弁２５は、一方の流入側接続口に出湯配管４２を接続し、他方の流入側接続口に出水配管４３を接続し、流出側接続口に第１利用側配管４４を接続している。
なお、出湯配管４２の一端は、給湯タンク１１の上部に接続されている。また第１利用側配管４４の一端は、浴室、キッチン、又は洗面所等の給湯用の蛇口に接続されている。給水配管４５は、出水配管４３の途中から分岐し、給湯タンク１１の底部に接続されている。
【００１０】
まず、図２を用いて給湯タンクの沸き上げ運転である貯湯運転モードについて説明する。
貯湯運転モードでは、三方弁３５の流入側接続口は給湯用配管４１側を連通させ、三方弁３４の流出側接続口は給湯用配管４１側を連通させる。
従って、循環ポンプ１２を運転することにより、給湯タンク１１の下部から流出する水は、三方弁３５、循環ポンプ１２、第１の給湯用熱交換器６２Ａ、三方弁３４を順に通り、再び給湯タンク１１の上部から流入する。
一方、ヒートポンプユニット６０も運転を行う。圧縮機６１で圧縮された冷媒は、制御弁６６Ｈを通って第１の給湯用熱交換器６２Ａに流入し、この第１の給湯用熱交換器６２Ａで放熱する。そして第１の給湯用熱交換器６２Ａから流出した冷媒は、制御弁６６Ｃで減圧された後、熱源側熱交換器６４にて吸熱し、制御弁６６Ｄを経由してガス状態で圧縮機６１に吸入される。
従って、第１の給湯用熱交換器６２Ａでは、冷凍サイクルを流れる冷媒の熱が給湯用配管４１を流れる水に伝達し、加熱された水は温水となり給湯タンク１１内に蓄えられる。このとき、温水は給湯タンク１１の上部から流入させ、冷水は給湯タンク１１の下部から流出させるため、給湯タンク１１内では、上層部に温水が蓄えられ、この温水層が徐々に厚くなる。そして給湯タンク１１の下部側に設けた温度センサ（図示しない）によって、給湯タンク１１内に十分な温水が蓄積された状態を検知し、沸き上げ運転を終了する。
【００１１】
次に、図３を用いて給湯タンク内の温水を利用して暖房ユニットを運転する第１の暖房運転モードについて説明する。
第１の暖房運転モードでは、三方弁３５の流入側接続口は配管５８側を連通させ、三方弁３４の流出側接続口は下部戻し管５７側を連通させる。
従って、循環ポンプ１２を運転することにより、給湯タンク１１の中間部から流出する水は、三方弁３５、循環ポンプ１２、第１の給湯用熱交換器６２Ａ、三方弁３４を順に通り、再び給湯タンク１１の下部から流入する。
一方、ヒートポンプユニット６０も運転を行う。圧縮機６１で圧縮された冷媒は、制御弁６６Ａを通って第２の給湯用熱交換器６２Ｂに流入し、この第２の給湯用熱交換器６２Ｂで放熱する。そして第２の給湯用熱交換器６２Ｂから流出した冷媒は、制御弁６６Ｂで減圧された後、第１の給湯用熱交換器６２Ａにて吸熱し、制御弁６６Ｇ、６６Ｉ、６６Ｄを経由してガス状態で圧縮機６１に吸入される。
従って、第２の給湯用熱交換器６２Ｂでは、冷凍サイクルを流れる冷媒の熱が利用側配管４９を流れる水に伝達し、加熱された水は温水となって利用側配管４９を循環し、暖房ユニット８０で暖房を行うことができる。なお、利用側配管４９に設けられている混合弁７７Ａによって、循環ポンプ１４から吐出された温水の一部は、第２の給湯用熱交換器６２Ｂを通ることなく、第２の給湯用熱交換器６２Ｂから流出した温水と混合され、暖房ユニット８０に流れる。このとき、第２の給湯用熱交換器６２Ｂへの温水の流量は、温度センサ９７Ａによって検出した温度と設定温度とを比較し、設定温度に近づけるように流量制御弁７８で制御する。例えば温度センサ９７Ａによって検出した温度が設定温度に近ければ、流量制御弁７８の開度を絞り、第２の給湯用熱交換器６２Ｂに流れる温水量を減少させる。このように、流量制御弁７８によって第２の給湯用熱交換器６２Ｂに流れる温水量を減少させ、暖房ユニット８０側の温度制御を行うことで、第２の給湯用熱交換器６２Ｂでの冷媒の放熱量を抑えることができる。
【００１２】
また、第１の給湯用熱交換器６２Ａでは、給湯用配管４１を流れる温水の熱が冷凍サイクルを流れる冷媒に伝達する。
このとき、温水は給湯タンク１１の中間部から流出させ、冷水は給湯タンク１１の下部から流入させるため、給湯タンク１１内では、上層部に温水を蓄えた状態で、中間部よりも下方の温水層が徐々に薄くなる。そして給湯タンク１１の中間部に設けた温度センサ（図示しない）によって、給湯タンク１１内に暖房用の温水が足りなくなった状態、例えば給湯タンク１１内の中間部での温水温度が所定値よりも低くなったことを検知することで、第１の暖房運転を終了する。なお、第１の給湯用熱交換器６２Ａに導く温水温度が所定温度以下となった場合を検知して第１の暖房運転を終了してもよい。また、第１の暖房運転を終了する場合には、第２の暖房運転モードに切り替える。通常は暖房ユニット８０側では暖房運転を継続するため、第１の暖房運転状態の終了とともに冷凍サイクルを切り替えて第２の暖房運転モードによって暖房運転を継続する。
【００１３】
なお、第１の暖房運転モードでは、給湯タンク１１から第１の給湯用熱交換器６２Ａに流入させる温水の温度を、所定の温度範囲となるように制御する。
所定の温度範囲を維持する一つの制御方法として、三方弁３５を混合弁として機能させ、給湯タンク１１の中間部から配管５８によって中温水を流出させ、給湯タンク１１の下部から給湯用配管４１によって低温水を流出させ、三方弁３５にて中温水と低温水とを混合する。本制御方法は、給湯タンク１１の中間部と下部とで温度差を生じている場合に有効である。
所定の温度範囲を維持する他の制御方法として、給湯タンク１１の下部から給湯用配管４１によって低温水を流出させ、第１の給湯用熱交換器６２Ａで放熱させた低温水を、給湯タンク１１の下部から下部戻し管５７によって流入させる。本制御方法は、給湯タンク１１内の温度が下部層を除いてほとんどが高温状態にある場合に有効である。
所定の温度範囲を維持する更に他の制御方法として、給湯タンク１１から第１の給湯用熱交換器６２Ａに流入させる温水の流量を、循環ポンプ１２を間欠運転させたり、循環ポンプ１２の能力制御によって変更する。本制御方法は、給湯タンク１１内の温度がほとんどが高温状態にある場合に有効である。
所定の温度範囲を維持する更に他の制御方法として、給湯タンク１１からの流出位置を変更するものであってもよい。図示の場合には、中間部と底部の２個所での流出位置を変更することが可能であるが、更に中間部に高さが異なる複数の流出口を備えることで、更に精度のよい制御を行うことが可能となる。
以上、所定の温度範囲を維持するいくつかの制御方法を示したが、これらの制御方法は単独でも、またいくつかの異なる制御方法を組み合わせてもよい。
なお、第１の暖房運転モードは、外気温度を検出し、外気温度が所定値よりも低い場合であって、給湯タンク１１内の温水温度が十分な温度にある場合に行うように制御することが好ましい。
【００１４】
次に、図４を用いて第２の暖房運転モードについて説明する。
ヒートポンプユニット６０では、圧縮機６１で圧縮された冷媒は、制御弁６６Ａを通って第２の給湯用熱交換器６２Ｂに流入し、この第２の給湯用熱交換器６２Ｂで放熱する。そして第２の給湯用熱交換器６２Ｂから流出した冷媒は、第１の給湯用熱交換器６２Ａをバイパスし、制御弁６６Ｆ、６６Ｇを経由して、制御弁６６Ｃで減圧された後、熱源側熱交換器６４にて吸熱し、制御弁６６Ｄを経由してガス状態で圧縮機６１に吸入される。
従って、第２の給湯用熱交換器６２Ｂでは、冷凍サイクルを流れる冷媒の熱が利用側配管４９を流れる水に伝達し、加熱された水は温水となって利用側配管４９を循環し、暖房ユニット８０で暖房を行うことができる。なお、利用側配管４９に設けられている混合弁７７Ａによって、循環ポンプ１４から吐出された温水の一部は、第２の給湯用熱交換器６２Ｂを通ることなく、第２の給湯用熱交換器６２Ｂから流出した温水と混合され、暖房ユニット８０に流れる。このとき、第２の給湯用熱交換器６２Ｂへの温水の流量は、温度センサ９７Ａによって検出した温度と設定温度とを比較し、設定温度に近づけるように流量制御弁７８で制御する。例えば温度センサ９７Ａによって検出した温度が設定温度に近くと、流量制御弁７８の開度を絞り、第２の給湯用熱交換器６２Ｂに流れる温水量を減少させる。このように、流量制御弁７８によって第２の給湯用熱交換器６２Ｂに流れる温水量を減少させ、暖房ユニット８０側の温度制御を行うことで、第２の給湯用熱交換器６２Ｂでの冷媒の放熱量を抑えることができる。
なお、本実施例に示すように、第２の暖房運転モードでは、第１の給湯用熱交換器６２Ａに冷凍サイクルの冷媒を流さないことが好ましい。
外気温が所定温度よりも高くなった場合や、暖房ユニット８０での暖房負荷が低下した場合で、冷凍能力に余力を生じた場合には、第２の暖房運転を終了し、暖房貯湯運転モードに切り替える。この第２の暖房運転モードから暖房貯湯運転モードへの切り替えは、温度センサ９６Ａ、９６Ｂでの高圧側冷媒温度を検知し、所定温度よりも高い温度を検知した場合に行う。
【００１５】
次に、図５を用いて暖房貯湯運転モードについて説明する。
三方弁３５の流入側接続口は給湯用配管４１側を連通させ、三方弁３４の流出側接続口は給湯用配管４１側を連通させる。
従って、循環ポンプ１２を運転することにより、給湯タンク１１の下部から流出する水は、三方弁３５、循環ポンプ１２、第１の給湯用熱交換器６２Ａ、三方弁３４を順に通り、再び給湯タンク１１の上部から流入する。
一方、ヒートポンプユニット６０も運転を行う。圧縮機６１で圧縮された冷媒は、制御弁６６Ａを通って第２の給湯用熱交換器６２Ｂに流入し、この第２の給湯用熱交換器６２Ｂで放熱する。そして第２の給湯用熱交換器６２Ｂから流出した冷媒は、制御弁６６Ｂを通って第１の給湯用熱交換器６２Ａに流入し、この第１の給湯用熱交換器６２Ａで更に放熱する。そして第１の給湯用熱交換器６２Ａから流出した冷媒は、制御弁６６Ｃで減圧された後、熱源側熱交換器６４にて吸熱し、制御弁６６Ｄを経由してガス状態で圧縮機６１に吸入される。
従って、第２の給湯用熱交換器６２Ｂでは、冷凍サイクルを流れる冷媒の熱が利用側配管４９を流れる水に伝達し、加熱された水は温水となって利用側配管４９を循環し、暖房ユニット８０で暖房を行うことができる。なお、利用側配管４９に設けられている混合弁７７Ａによって、循環ポンプ１４から吐出された温水の一部は、第２の給湯用熱交換器６２Ｂを通ることなく、第２の給湯用熱交換器６２Ｂから流出した温水と混合され、暖房ユニット８０に流れる。このとき、第２の給湯用熱交換器６２Ｂへの温水の流量は、温度センサ９７Ａによって検出した温度と設定温度とを比較し、設定温度に近づけるように流量制御弁７８で制御する。例えば温度センサ９７Ａによって検出した温度が設定温度に近くと、流量制御弁７８の開度を絞り、第２の給湯用熱交換器６２Ｂに流れる温水量を減少させる。このように、流量制御弁７８によって第２の給湯用熱交換器６２Ｂに流れる温水量を減少させ、暖房ユニット８０側の温度制御を行うことで、第２の給湯用熱交換器６２Ｂでの冷媒の放熱量を抑えることができる。従って、第１の給湯用熱交換器６２Ａでの放熱量を確保することができる。
【００１６】
また、第１の給湯用熱交換器６２Ａでは、冷凍サイクルを流れる冷媒の熱が給湯用配管４１を流れる水に伝達し、加熱された水は温水となり給湯タンク１１内に蓄えられる。このとき、温水は給湯タンク１１の上部から流入させ、冷水は給湯タンク１１の下部から流出させるため、給湯タンク１１内では、上層部に温水が蓄えられ、この温水層が徐々に厚くなる。そして給湯タンク１１の下部側に設けた温度センサ（図示しない）によって、給湯タンク１１内に十分な温水が蓄積された状態を検知し、暖房貯湯運転モードを終了する。この暖房貯湯運転モードの終了後には、第２の暖房運転モードに、又は第１の暖房運転モードに切り替えることができる。
図６は、給湯タンク１１内に十分な温水が蓄積され、暖房貯湯運転モードを終了した後に、第２の暖房運転モードに切り替えた状態を示している。
【００１７】
次に、図７を用いて給湯タンク内の温水を給湯用として利用する場合の給湯運転について説明する。なお、図７は第１の暖房運転モード時での給湯運転を示している。
第１利用側配管４４に接続された蛇口を開くことで給湯水を利用することができる。給湯温度は、混合弁２５の流入側流路の混合比を変更することで調整される。給湯温度を高くする場合には、出湯配管４２からの流入量を増加させ、給湯温度を低くする場合には、出水配管４３からの流入量を増加させる。
給湯タンク１１内は、出湯配管４２から温水が流出することで圧力が低下する。従って、出湯配管４２からの温水の流出量だけ、給水配管４５から給湯タンク１１内に水が流入する。そして、温度センサによって給湯タンク１１内の温水量が所定量よりも少なくなったことを検知した場合には、沸き上げ運転である貯湯運転モードを再開する。
【００１８】
次に、図８を用いて第１の暖房運転モードの他の運転方法について説明する。
三方弁３５の流入側接続口は配管５８側を連通させ、三方弁３４の流出側接続口は下部戻し管５７側を連通させる。
従って、循環ポンプ１２を運転することにより、給湯タンク１１の中間部から流出する水は、三方弁３５、循環ポンプ１２、第１の給湯用熱交換器６２Ａ、三方弁３４を順に通り、再び給湯タンク１１の下部から流入する。
一方、ヒートポンプユニット６０も運転を行う。圧縮機６１で圧縮された冷媒は、制御弁６６Ａを通って第２の給湯用熱交換器６２Ｂに流入し、この第２の給湯用熱交換器６２Ｂで放熱する。そして第２の給湯用熱交換器６２Ｂから流出した冷媒は、制御弁６６Ｂで減圧された後、第１の給湯用熱交換器６２Ａにて吸熱し、制御弁６６Ｃを経由して熱源側熱交換器６４にて更に吸熱し、制御弁６６Ｄを経由してガス状態で圧縮機６１に吸入される。
従って、第２の給湯用熱交換器６２Ｂでは、冷凍サイクルを流れる冷媒の熱が利用側配管４９を流れる水に伝達し、加熱された水は温水となって利用側配管４９を循環し、暖房ユニット８０で暖房を行うことができる。なお、利用側配管４９に設けられている混合弁７７Ａによって、循環ポンプ１４から吐出された温水の一部は、第２の給湯用熱交換器６２Ｂを通ることなく、第２の給湯用熱交換器６２Ｂから流出した温水と混合され、暖房ユニット８０に流れる。このとき、第２の給湯用熱交換器６２Ｂへの温水の流量は、温度センサ９７Ａによって検出した温度と設定温度とを比較し、設定温度に近づけるように流量制御弁７８で制御する。例えば温度センサ９７Ａによって検出した温度が設定温度に近くと、流量制御弁７８の開度を絞り、第２の給湯用熱交換器６２Ｂに流れる温水量を減少させる。このように、流量制御弁７８によって第２の給湯用熱交換器６２Ｂに流れる温水量を減少させ、暖房ユニット８０側の温度制御を行うことで、第２の給湯用熱交換器６２Ｂでの冷媒の放熱量を抑えることができる。
【００１９】
また、第１の給湯用熱交換器６２Ａでは、給湯用配管４１を流れる温水の熱が冷凍サイクルを流れる冷媒に伝達する。また、熱源側熱交換器６４においても冷媒は大気から吸熱を行う。
このとき、温水は給湯タンク１１の中間部から流出させ、冷水は給湯タンク１１の下部から流入させるため、給湯タンク１１内では、上層部に温水を蓄えた状態で、中間部よりも下方の温水層が徐々に薄くなる。そして給湯タンク１１の中間部に設けた温度センサ（図示しない）によって、給湯タンク１１内に暖房用の温水が足りなくなった状態、例えば給湯タンク１１内の中間部での温水温度が所定値よりも低くなったことを検知することで、第１の暖房運転を終了する。なお、第１の給湯用熱交換器６２Ａに導く温水温度が所定温度以下となった場合を検知して第１の暖房運転を終了してもよい。なお、第１の暖房運転を終了する場合には、第２の暖房運転モードに切り替える。通常は暖房ユニット８０側では暖房運転を継続するため、第１の暖房運転状態の終了とともに冷凍サイクルを切り替えて第２の暖房運転モードによって暖房運転を継続する。
【００２０】
なお、本実施例においても、既に図３を用いて説明した第１の暖房運転モードと同様に、給湯タンク１１から第１の給湯用熱交換器６２Ａに流入させる温水の温度を、所定の温度範囲となるように制御する。
なお、本実施例による第１の暖房運転モードは、外気温度を検出し、外気温度が所定値よりも高い場合に行うように制御することが好ましい。
【００２１】
以下、本発明の他の実施例によるヒートポンプ式給湯機について図面を用いて説明する。なお、同一機能を有する部材には同一番号を付して説明を省略する。
図９は、他の実施例によるヒートポンプ給湯機の回路構成図である。
本実施例によるヒートポンプ式給湯機は、上記実施例に、更に浴槽７０内の浴槽水を加熱する沸上機能と、浴槽７０内に注湯する注湯機能を設けたものである。
浴槽７０内の浴槽水を加熱する沸上機能は、浴槽７０内の浴槽水を給湯タンク１１内に配置した浴槽用熱交換器１５に導き、浴槽用熱交換器１５で加熱された温水を浴槽７０に導く浴槽用配管７２と、この浴槽用配管７２内の温水を循環させる循環ポンプ７１とによって構成されている。なお、浴槽用配管７２には、浴槽用熱交換器１５をバイパスする配管が設けられ、このバイパス配管には混合弁７３を設けている。この混合弁７３によって、循環ポンプ７１から吐出された温水の一部は、浴槽用熱交換器１５を通ることなく、浴槽用熱交換器１５から流出した温水と混合され、浴槽７０に流れる。
浴槽７０内に注湯する注湯機能は、出水配管４３から分岐させた冷水側注湯用配管５４Ａと、出湯配管４２から分岐させた温水側注湯用配管５４Ｂと、冷水側注湯用配管５４Ａと温水側注湯用配管５４Ｂとを流入側接続口に接続する混合弁５３と、混合弁５３の流出側接続口に接続される注湯用配管５５と、この注湯用配管５５に設けた開閉弁５６とから構成され、注湯用配管５５は浴槽用配管７２に接続している。
本実施例によれば、上記実施例で説明した第１の暖房運転モードや第２の暖房運転モードで運転することができるとともに、浴槽７０の沸き上げや注湯を行うことができる。
【００２２】
図１０は、更に他の実施例によるヒートポンプ式給湯機の回路構成図である。
本実施例によるヒートポンプ式給湯機は、給湯ユニット１０の構成を変更したものであり、ヒートポンプユニット６０についての構成と動作は上記実施例と同様であるので説明を省略する。
給湯用配管４１は、一端が給湯タンク１１の底部に接続され、第１の給湯用熱交換器６２Ａの利用側配管を構成し、他端が給湯タンク１１の上部に接続され、管路中に循環ポンプ１２を備えている。給湯用配管４１の一端側には、給湯タンク１１内の貯留水の流出を制御する三方弁３３が設けられている。この三方弁３３と第１の給湯用熱交換器６２Ａとの間の給湯用配管４１には、循環ポンプ１２が設けられている。一方、給湯用配管４１の他端側、すなわち第１の給湯用熱交換器６２Ａと給湯用タンク１１との間の給湯用配管４１には、三方弁３４が設けられている。そしてこの三方弁３４の他方の流出側開口には、給湯タンク１１の下部に接続される下部戻し管５７が設けられている。また、給湯用配管４１の他端は、三方弁２３を介してタンク１１の上部に接続されている。また、三方弁３６は、循環ポンプ１２の流出側配管であって、給湯ユニット１０内に配置される給湯用配管４１に設けられている。そして、この三方弁３６の他方の流出側開口には、配管５８が設けられ、この配管５８の他端は、三方弁３４の流入側配管であって、給湯ユニット１０内に配置される給湯用配管４１に設けられている。
【００２３】
熱源側配管４６は、一端が三方弁２３の流出側接続口に接続され、浴槽用熱交換器１３Ｂの熱源側配管を構成し、他端が三方弁３３の流入側接続口に接続されている。熱源側配管４６には、流量制御弁２６が設けられている。
また、熱源側配管４６は、浴槽用熱交換器１３Ｂの上流側に温度センサ９１を、浴槽用熱交換器１３Ｂの下流側に温度センサ９２を設けている。また、浴槽用配管７２は、浴槽用熱交換器１３Ｂの上流側に温度センサ９３を設けている。また熱源側配管４６は、流量センサ９４を設けている。
本実施例では、給湯タンク１１内の温水を利用した浴槽水沸き上げ運転では、三方弁３３は、給湯タンク１１との接続配管を閉とし、熱源側配管４６と給湯用配管４１とを連通させる。また、三方弁３４は、下部戻し管５７への流出側接続口を開とし、給湯タンク１１の上部への流れを阻止する。また、三方弁３６は、配管５８への流出側接続口を開とし、第１の給湯用熱交換器６２Ａにつながる給湯用配管４１への流出側接続口を閉とする。
従って、循環ポンプ１２を運転することにより、給湯タンク１１の上部から流出する温水は、三方弁２３、浴槽用熱交換器１３Ｂ、三方弁３３、循環ポンプ１２、三方弁３６、三方弁３４、下部戻し管５７を順に通り、給湯タンク１１の下部から流入する。
本実施例によれば、上記実施例で説明した貯湯運転モード、第１の暖房運転モード、及び第２の暖房運転モードで用いる循環ポンプ１２を用いて、浴槽水沸き上げ運転を行うことができる。また、給湯ユニット１０内での循環系路とすることで、無駄な放熱を防止することができる。
【００２４】
また、本実施例によれば、第１の給湯用熱交換器６２Ａを利用した浴槽水沸き上げ運転を行うこともできる。
この第１の給湯用熱交換器６２Ａを利用した浴槽水沸き上げ運転では、三方弁３６の流出側接続口を給湯用配管４１とし、配管５８への流出側接続口を閉とする。また、三方弁２３の流入側接続口を給湯用配管４１、流出側接続口を熱源側配管４６として、給湯用配管４１と熱源側配管４６とを連通させる。
この場合の運転では、ヒートポンプユニット６０も運転を行う。圧縮機６１で圧縮された冷媒は、第１の給湯用熱交換器６２Ａで放熱し、制御弁６６Ｃで減圧された後、熱源側熱交換器６４にて吸熱し、ガス状態で圧縮機６１に吸入される。
従って、循環ポンプ１２を運転することにより、浴槽用熱交換器１３Ｂを通った低温水は、三方弁３３、循環ポンプ１２を通って第１の給湯用熱交換器６２Ａに流入する。そして、第１の給湯用熱交換器６２Ａで加熱された高温水は、三方弁３４、三方弁２３を経由して、再び浴槽用熱交換器１３Ｂに流入する。
【００２５】
なお、この運転モードにおいて、第１の給湯用熱交換器６２Ａでの能力が浴槽７０での負荷を上回る場合には、給湯タンク１１の沸き上げ運転を同時に行うこともできる。
この運転モードでは、三方弁２３の他の流出側開口となる給湯タンク１１に接続されている給湯用配管４１に、一部の高温水を流出させるものである。なお、三方弁３３の開度を調整し、給湯タンク１１内の低温水を流出させる。
このように、一部の高温水を給湯タンク１１内に戻すことで、浴槽水の沸き上げ運転を継続しつつ、給湯タンク１１内にも温水を蓄積することができる。
なお、この場合の第１の給湯用熱交換器６２Ａでの能力と浴槽７０での負荷との関係は、温度センサ９２での検出温度で判定できる他、温度センサ９１と温度センサ９２との検出温度から更に正確に判定することができる。また、給湯タンク１１への高温水の分配量は、三方弁２３や三方弁３３によっても調整は可能であるが、熱源側配管４６を流れる温水量を流量センサ９４にて検出し、流量制御弁２６を制御することによっても調整することができる。
【００２６】
図１１は、更に他の実施例によるヒートポンプ式給湯機の回路構成図である。
本実施例では、給湯ユニット１０の構成は図９に示す実施例と同様であり、またヒートポンプユニット６０についての基本構成と動作については図１に示す実施例と同様であるので説明を省略する。
本実施例によるヒートポンプ式給湯機は、暖房ユニット８０に、更に浴室乾燥ユニット９０を加えたものである。浴室乾燥ユニット９０は、暖房ユニット８０と並列に設けられており、第２の給湯用熱交換器６２Ｂの利用側配管と循環ポンプ１４とともに、第２利用側配管５２にて環状に接続して構成されている。第２利用側配管５２には、第２の給湯用熱交換器６２Ｂをバイパスするバイパス配管を有し、このバイパス配管に混合弁７７Ｂを設けている。また第２利用側配管５２は、利用側配管４９と流路の一部を共有し、第２の給湯用熱交換器６２Ｂへの流量を制御する流量制御弁７８を有し、また温度センサ９７Ｂが設けられている。
第２の給湯用熱交換器６２Ｂでは、冷凍サイクルを流れる冷媒の熱が利用側配管４９及び第２利用側配管５２を流れる水に伝達し、加熱された水は温水となって利用側配管４９及び第２利用側配管５２を循環し、暖房ユニット８０で暖房を行い、また浴室乾燥ユニット９０で浴室乾燥を行うことができる。なお、利用側配管４９に設けられている混合弁７７Ａによって、循環ポンプ１４から吐出された温水の一部は、第２の給湯用熱交換器６２Ｂを通ることなく、第２の給湯用熱交換器６２Ｂから流出した温水と混合され、暖房ユニット８０に流れる。また、第２利用側配管５２に設けられている混合弁７７Ｂによって、循環ポンプ１４から吐出された温水の一部は、第２の給湯用熱交換器６２Ｂを通ることなく、第２の給湯用熱交換器６２Ｂから流出した温水と混合され、浴室乾燥ユニット９０に流れる。このとき、第２の給湯用熱交換器６２Ｂへの温水の流量は、温度センサ９７Ａ、９７Ｂによって検出したそれぞれの温度とそれぞれの設定温度とを比較し、設定温度に近づけるように流量制御弁７８で制御する。例えば温度センサ９７Ａ、９７Ｂによって検出した温度が設定温度に近くと、流量制御弁７８の開度を絞り、第２の給湯用熱交換器６２Ｂに流れる温水量を減少させる。このように、流量制御弁７８によって第２の給湯用熱交換器６２Ｂに流れる温水量を減少させ、暖房ユニット８０側の温度制御を行うことで、第２の給湯用熱交換器６２Ｂでの冷媒の放熱量を抑えることができる。また、暖房ユニット８０と浴室乾燥ユニット９０への温水量の調整は、混合弁７７Ａと混合弁７７Ｂとによって行う。
本実施例によれば、第２の給湯用熱交換器６２Ｂを用いて浴室乾燥ユニット９０を運転することができる。
【００２７】
図１２は、更に他の実施例によるヒートポンプ式給湯機の回路構成図である。
本実施例では、給湯ユニット１０の構成と動作は図１０に示す実施例と同様であり、またヒートポンプユニット６０についての構成と動作については図１１に示す実施例と同様であるので説明を省略する。
本実施例によれば、浴槽７０の沸き上げや浴室乾燥ユニット９０を、暖房ユニット８０とともに利用することができる。
【００２８】
【発明の効果】
本発明によれば、暖房運転に給湯タンク内の温水を利用するとともに、給湯タンク内に必要量の温水が貯留していない場合でも暖房運転を継続することができる。
また本発明によれば、給湯用熱交換器を利用した暖房運転を行いながら、給湯用タンク内に温水を貯留することができる。
【図面の簡単な説明】
【図１】本発明の一実施例によるヒートポンプ式給湯機の回路構成図
【図２】本実施例によるヒートポンプ式給湯機の貯湯運転モードを示す回路構成図
【図３】本実施例によるヒートポンプ式給湯機の第１の暖房運転モードを示す回路構成図
【図４】本実施例によるヒートポンプ式給湯機の第２の暖房運転モードを示す回路構成図
【図５】本実施例によるヒートポンプ式給湯機の暖房貯湯運転モードを示す回路構成図
【図６】本実施例によるヒートポンプ式給湯機の暖房貯湯運転モードの終了状態を示す回路構成図
【図７】本実施例によるヒートポンプ式給湯機の第１の暖房運転モード時での給湯運転を示す回路構成図
【図８】本実施例によるヒートポンプ式給湯機の他の第１の暖房運転モードを示す回路構成図
【図９】本発明の他の実施例によるヒートポンプ式給湯機の回路構成図
【図１０】本発明の更に他の実施例によるヒートポンプ式給湯機の回路構成図
【図１１】本発明の更に他の実施例によるヒートポンプ式給湯機の回路構成図
【図１２】本発明の更に他の実施例によるヒートポンプ式給湯機の回路構成図
【符号の説明】
１０給湯ユニット
１１給湯タンク
１２循環ポンプ
１３暖房用熱交換器
１４循環ポンプ
６０ヒートポンプユニット
８０暖房ユニット[0001]
BACKGROUND OF THE INVENTION
The present invention includes a heat pump unit having a refrigeration cycle, a hot water supply unit having a hot water supply tank, and a heating unit composed of an air conditioner equipped with a hot water pipe, and performs heat exchange with water in the hot water tank as a heat exchanger for hot water supply. The present invention relates to a heat pump type hot water heater having a first hot water supply heat exchanger and a second hot water supply heat exchanger used as a heat source side heat exchanger of a heating unit.
[0002]
[Prior art]
Conventionally, a heat pump type hot water heater using a refrigeration cycle has been proposed, for example, one that stores hot water in a hot water supply tank using a refrigeration cycle or one that supplies hot water to a bathtub (for example, (See Patent Document 1 and Patent Document 2).
[0003]
[Patent Document 1]
JP 2002-130819 A [Patent Document 2]
Japanese Patent Laid-Open No. 2002-243274 [0004]
[Problems to be solved by the invention]
On the other hand, in recent years, a refrigeration cycle using carbon dioxide as a refrigerant has begun to be proposed. By using carbon dioxide as a refrigerant and operating at a pressure exceeding the critical pressure, high-temperature heat can be used, and hot water storage and Use as a heat source for heating equipment as well as hot water supply is desired.
However, in order to use it as a heat source for heating equipment other than hot water storage and hot water supply functions, the burden on the refrigeration cycle is large, and it is difficult to supply a stable heat source.
[0005]
Then, an object of this invention is to provide the heat pump type water heater which can continue heating operation stably.
In particular, the present invention provides a heat pump water heater that uses hot water in a hot water supply tank for heating operation and can continue the heating operation even when the required amount of hot water is not stored in the hot water supply tank. With the goal.
Another object of the present invention is to provide a water heater that can store hot water in a hot water supply tank while performing a heating operation using a heat exchanger for hot water supply.
[0006]
[Means for Solving the Problems]
The heat pump type hot water heater of the present invention according to claim 1 includes a heat pump unit having a refrigeration cycle in which a compressor, a heat exchanger for hot water supply, an expansion valve, and a heat source side heat exchanger are connected by piping, and a hot water supply having a hot water tank. A heating unit comprising a unit and an air conditioning device such as a floor heating device, a hot air device, a drying device, or a dehumidifying device provided with a hot water pipe, and as the hot water supply heat exchanger, heat exchange with water in the hot water supply tank A heat pump type hot water heater having a first hot water supply heat exchanger and a second hot water supply heat exchanger used as a heat source side heat exchanger of the heating unit, wherein the heat source side heat exchanger is an evaporator And a hot water storage operation mode in which hot water is stored in the hot water supply tank using the first hot water supply heat exchanger, and the hot water in the hot water tank is guided to the first hot water supply heat exchanger. 1 salary The use heat exchanger dissipates heat to the refrigerant from the hot water is used as an evaporator, a first heating operation mode for operating the heating unit with a heat exchanger for the second hot-water supply, the heat source-side heat exchanger A second heating operation mode in which the heating unit is operated using the second heat supply heat exchanger and the heat source side heat exchanger is used as the evaporator. A heating hot water storage operation mode in which the heating unit is operated by using a heat exchanger for heating, and further hot water is stored in the hot water supply tank by using the first heat exchanger for hot water supply, and the heating hot water storage operation mode. Then, the second hot water supply heat exchanger is arranged closer to the discharge side of the compressor than the first hot water supply heat exchanger.
According to a second aspect of the present invention , in the heat pump hot water supply apparatus according to the first aspect , in the first heating operation mode, hot water is allowed to flow out from an intermediate portion of the hot water tank, and the first heat exchange for hot water supply is performed. The hot water radiated by the heater is caused to flow from the lower part of the hot water supply tank.
According to a third aspect of the present invention , in the heat pump type hot water heater according to the first or second aspect, in the first heating operation mode, the first hot water supply heat exchanger is caused to flow from the hot water tank. The temperature of the hot water is controlled to be within a predetermined temperature range.
According to a fourth aspect of the present invention, in the heat pump type hot water heater according to any one of the first to third aspects, in the first heating operation mode, intermediate hot water is supplied from an intermediate portion of the hot water tank to the hot water supply. Low temperature water is allowed to flow out from the lower part of the tank, and the medium temperature water and the low temperature water are mixed.
According to a fifth aspect of the present invention, in the heat pump hot water heater according to any one of the first to fourth aspects, the first hot water supply heat exchanger from the hot water tank in the first heating operation mode. The flow rate of the hot water flowing into the water is changed.
According to a sixth aspect of the present invention, in the heat pump type water heater according to any one of the second to fifth aspects, the position of the outflow from the hot water tank is changed in the first heating operation mode. And
According to a seventh aspect of the present invention , in the heat pump hot water supply apparatus according to any one of the first to sixth aspects, the heating hot water storage operation mode is set when the hot water temperature in the hot water supply tank is lower than a predetermined value. It is characterized by performing.
The present invention according to claim 8 is the heat pump water heater according to any one of claims 1 to 7 , wherein the refrigerant temperature on the outlet side of the second heat exchanger for hot water supply is in the heating hot water storage operation mode. The flow rate of water flowing through the use side piping of the second hot water supply heat exchanger is changed so as to maintain the temperature at a predetermined temperature.
According to a ninth aspect of the present invention, in the heat pump water heater according to any one of the first to eighth aspects, the first heating operation mode is performed when the outside air temperature is lower than a predetermined value. Features.
According to a tenth aspect of the present invention, in the heat pump hot water supply apparatus according to any one of the first to ninth aspects, in the hot water storage operation mode, a refrigerant of a refrigeration cycle is caused to flow through the second hot water supply heat exchanger. It is characterized by not.
The present invention of claim 11, wherein, in the heat pump water heater according to any one of claims 1 to 10, wherein in the second heating operation mode, the refrigeration cycle in the first hot water supply heat exchanger It is characterized by not flowing a refrigerant.
The present invention according to claim 12 is the heat pump water heater according to any one of claims 1 to 11 , wherein a bypass pipe for bypassing the use side pipe is provided, and a mixing valve is provided for the bypass pipe. It is characterized by.
A thirteenth aspect of the present invention is the heat pump water heater according to any one of the first to twelfth aspects, wherein the temperature of the hot water led to the first heat exchanger for hot water supply is the first heating operation mode. Is switched to the second heating operation mode when the temperature becomes equal to or lower than a predetermined temperature.
According to a fourteenth aspect of the present invention, in the heat pump hot water supply apparatus according to any one of the first to thirteenth aspects, a boiling means for heating the bathtub water in the bathtub is provided, and the boiling means is the bathtub. The bath water in the bathtub is guided to the heat exchanger for the bathtub, the hot water heated in the bathtub heat exchanger is guided to the bathtub, and the circulation pump that circulates the hot water in the bathtub pipe is configured. It is characterized by that.
According to a fifteenth aspect of the present invention, in the heat pump water heater according to any one of the first to fourteenth aspects, the refrigerant used in the refrigeration cycle is carbon dioxide, and the high pressure side is operated in a state exceeding a critical pressure. It is characterized by that.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The heat pump type hot water heater according to the first embodiment of the present invention uses a heat source side heat exchanger as an evaporator, and uses a first hot water supply heat exchanger to store hot water in a hot water tank. The hot water in the hot water tank is guided to the first hot water supply heat exchanger, the first hot water supply heat exchanger is used as an evaporator to radiate heat from the hot water to the refrigerant, and the second hot water supply heat exchanger is installed. A first heating operation mode in which the heating unit is operated using a heat source side heat exchanger as an evaporator, and a second heating operation mode in which the heating unit is operated using a second hot water supply heat exchanger, using a heat source side heat exchanger as an evaporator, with a second hot-water supply heat exchanger operating the heating unit, heating the hot water storage for storing hot water for hot water supply tank further using the first hot water supply heat exchanger In the heating and hot water storage operation mode, the first mode Than the heat exchanger for hot water is to place a second hot-water heat exchanger on the discharge side of the compressor. According to the present embodiment, the hot water storage operation mode, the first heating operation mode using the first heat exchanger for hot water supply as an evaporator, and the second heating operation mode using the heat source side heat exchanger as an evaporator And a heating hot water storage operation mode using the second hot water supply heat exchanger and the first hot water supply heat exchanger. Further, according to the present embodiment, in the heating and hot water storage operation mode, the heating operation is prioritized by disposing the second hot water supply heat exchanger on the discharge side of the compressor rather than the first hot water supply heat exchanger. And the heating capacity can be maintained.
According to a second embodiment of the present invention , in the heat pump type hot water heater according to the first embodiment, in the first heating operation mode, hot water is caused to flow out from an intermediate portion of the hot water tank, and the first hot water supply heat is supplied. The hot water radiated by the exchanger is caused to flow from the lower part of the hot water supply tank. According to the present embodiment, the hot water storage operation mode and the first heating operation mode using the first hot water supply heat exchanger as an evaporator can be performed. Further, according to the present embodiment, in the first heating operation mode, the hot water can be always stored in the upper part of the hot water supply tank by allowing the hot water to flow out from the middle part of the hot water supply tank. By flowing the hot water radiated by the heat exchanger from the lower part of the hot water supply tank, it is possible to prevent the low temperature water from mixing in the hot water supply tank.
According to a third embodiment of the present invention , in the heat pump hot water heater according to the first or second embodiment, in the first heating operation mode, hot water is allowed to flow from the hot water tank into the first hot water supply heat exchanger. Is controlled so as to be within a predetermined temperature range. According to the present embodiment, the hot water storage operation mode and the first heating operation mode using the first hot water supply heat exchanger as an evaporator can be performed. Further, according to the present embodiment, in the first heating operation mode, by controlling the temperature of the hot water flowing from the hot water supply tank to the first hot water supply heat exchanger to be within a predetermined temperature range, High heat exchange efficiency can be maintained with the first heat exchanger for hot water supply.
According to a fourth embodiment of the present invention, in the heat pump hot water heater according to the first to third embodiments, in the first heating operation mode, the medium hot water is supplied from the middle portion of the hot water tank from the lower portion of the hot water tank. Low temperature water is discharged, and medium temperature water and low temperature water are mixed. According to the present embodiment, the temperature of the hot water flowing into the first hot water supply heat exchanger is controlled to be within a predetermined temperature range by mixing the medium temperature water and the low temperature water in the hot water tank. Can do.
According to a fifth embodiment of the present invention, in the heat pump hot water heater according to the first to fourth embodiments, hot water is allowed to flow from the hot water supply tank to the first hot water supply heat exchanger in the first heating operation mode. The flow rate is changed. According to the present embodiment, the temperature of the hot water that flows into the first hot water supply heat exchanger by changing the flow rate of the hot water that flows into the first hot water supply heat exchanger from the hot water tank is set within a predetermined temperature range. It can control to become.
The sixth embodiment according to the present invention changes the outflow position from the hot water supply tank in the first heating operation mode in the heat pump hot water heater according to the second to fifth embodiments. According to the present embodiment, the temperature of hot water flowing into the first hot water supply heat exchanger can be controlled to be within a predetermined temperature range by changing the outflow position from the hot water supply tank.
The seventh embodiment according to the present invention performs the heating hot water storage operation mode when the hot water temperature in the hot water tank is lower than a predetermined value in the heat pump hot water heater according to the first to sixth embodiments. is there. According to the present embodiment, the hot water storage operation mode, the second heating operation mode in which the heat source side heat exchanger is used as an evaporator, the second hot water supply heat exchanger, and the first hot water supply heat exchanger are used. The heating and hot water storage operation mode can be performed. Moreover, according to this Embodiment, when the temperature of the hot water in the hot water supply tank is low, the hot water can be stored in the hot water tank while performing the heating operation.
According to an eighth embodiment of the present invention , in the heat pump hot water heater according to the first to seventh embodiments, the refrigerant temperature on the outlet side of the second hot water supply heat exchanger is set to a predetermined temperature in the heating hot water storage operation mode. The flow rate of the water flowing through the use side piping of the second hot water supply heat exchanger is changed so as to be maintained. According to the present embodiment, the hot water storage operation mode, the second heating operation mode in which the heat source side heat exchanger is used as an evaporator, the second hot water supply heat exchanger, and the first hot water supply heat exchanger are used. The heating and hot water storage operation mode can be performed. Moreover, according to this Embodiment, warm water accumulation | storage to a hot water supply tank can be stably performed by changing the flow volume of the water which flows through the utilization side piping of the 2nd hot water supply heat exchanger.
The ninth embodiment according to the present invention performs the first heating operation mode when the outside air temperature is lower than a predetermined value in the heat pump type water heater according to the first to eighth embodiments. According to the present embodiment, when the outside air temperature is low, priority is given to the first heating operation mode using the hot water in the hot water supply tank, so that it is possible to operate with high heating efficiency.
According to a tenth embodiment of the present invention, in the heat pump hot water heater according to the first to ninth embodiments, the refrigerant of the refrigeration cycle does not flow through the second hot water supply heat exchanger in the hot water storage operation mode. is there. According to this Embodiment, it can prevent that a scale arises in the utilization side piping of the 2nd hot water supply heat exchanger.
Eleventh Embodiment of the present invention, in the first heat pump water heater according to an embodiment of the first 0, in the second heating operation mode, the refrigerant of the refrigeration cycle in the first hot water supply heat exchanger It does not flow. According to this Embodiment, it can prevent that a scale arises in the utilization side piping of the 1st hot water supply heat exchanger.
According to a twelfth embodiment of the present invention, in the heat pump water heater according to the first to eleventh embodiments, a bypass pipe that bypasses the use side pipe is provided, and a mixing valve is provided in the bypass pipe. According to the present embodiment, it is possible to change the amount of hot water flowing through the use side piping of the second hot water supply heat exchanger without changing the amount of hot water flowing through the heating unit side.
According to a thirteenth embodiment of the present invention, in the heat pump hot water heater according to the first to twelfth embodiments, in the first heating operation mode, the temperature of hot water led to the first heat exchanger for hot water supply is a predetermined temperature. When it becomes below, it switches to 2nd heating operation mode. According to the present embodiment, the heating operation can be continued even when the hot water in the hot water supply tank is insufficient while giving priority to the heating operation using the hot water in the hot water supply tank.
In a fourteenth embodiment according to the present invention, in the heat pump type water heater according to the first to thirteenth embodiments, a boiling means for heating the bathtub water in the bathtub is provided, and the boiling means is used as the bathtub in the bathtub. It is comprised by the piping for bathtubs which guides water to the heat exchanger for bathtubs, the hot water heated with the heat exchanger for bathtubs to the bathtub, and the circulation pump which circulates the hot water in the piping for bathtubs. According to the present embodiment, it is possible to boil the bathtub during the heating operation using the heat exchanger for heating.
According to a fifteenth embodiment of the present invention, in the heat pump type water heater according to the first to fourteenth embodiments, the refrigerant used in the refrigeration cycle is carbon dioxide, and the high pressure side is operated in a state exceeding the critical pressure. is there. According to the present embodiment, by using carbon dioxide as a refrigerant, the water heater can be used at a high temperature, and the hot water storage function and the boiling function can be improved.
[0008]
【Example】
Hereinafter, a heat pump type water heater according to an embodiment of the present invention will be described with reference to the drawings.
FIGS. 1-8 is a circuit block diagram of the heat pump type water heater by a present Example.
The heat pump type hot water heater according to the present embodiment includes a hot water supply unit 10, a heat pump unit 60, and a heating unit 80.
The hot water supply unit 10 includes a hot water tank 11 for storing hot water, and a circulation pump 12 for guiding the low temperature water in the hot water tank 11 to the heat pump unit 60 and returning the hot water heated by the heat pump unit 60 to the hot water tank 11. Yes.
The heat pump unit 60 includes a compressor 61, a first hot water supply heat exchanger 62A, a second hot water supply heat exchanger 62B, a control valve 66, and a heat source side heat exchanger 64 connected by piping to form a refrigeration cycle. is doing.
The first hot water supply heat exchanger 62 A performs heat exchange between the heat source side pipe constituting the refrigeration cycle and the use side pipe constituting the hot water supply unit 10.
The second hot water supply heat exchanger 62 B performs heat exchange between the heat source side pipe constituting the refrigeration cycle and the use side pipe constituting the heating unit 80. The control valve 66A is provided between the discharge side of the compressor 61 and the second hot water supply heat exchanger 62B, and the control valve 66B is provided with the second hot water supply heat exchanger 62B and the first hot water supply heat exchanger 62A. The control valve 66C is connected to the piping between the first hot water supply heat exchanger 62A and the heat source side heat exchanger 64, and the control valve 66D is connected to the heat source side heat exchanger 64 and the compressor 61. It is provided in the pipe between each side. One end of the control valve 66E is connected to a pipe between the control valve 66D and the suction side of the compressor 61, and the other end is connected to a pipe between the control valve 66A and the second hot water supply heat exchanger 62B. Provided in the pipe. One end of each of the control valve 66F and the control valve 66G is a pipe between the second hot water supply heat exchanger 62B and the control valve 66B, and the other end is between the first hot water supply heat exchanger 62A and the control valve 66C. Each pipe is connected to a pipe connected to each other. The control valve 66H has one end connected to a pipe between the discharge side of the compressor 61 and the control valve 66A, and the other end connected to a pipe between the control valve 66B and the first hot water supply heat exchanger 62A. Provided in the pipe. One end of the control valve 66I is provided in a pipe between the control valve 66F and the control valve 66G, and the other end is provided in a pipe connected to the pipe between the heat source side heat exchanger 64 and the control valve 66D. ing. These control valves 60 may function as expansion valves together with the function of blocking the circulation of the refrigerant flowing through the respective pipes.
Further, a temperature sensor 96A is provided in the discharge side piping of the compressor 61, and a temperature sensor 96B is provided in the piping between the second hot water supply heat exchanger 62B and the control valve 66B.
In order to obtain high-temperature water on the use side piping side of the first hot water supply heat exchanger 62A and the second hot water supply heat exchanger 62B, the refrigeration cycle uses carbon dioxide as a refrigerant at a pressure exceeding the critical pressure. It is preferable to drive.
The heating unit 80 is a unit mainly composed of an air conditioner having a heating function such as a floor heating device, a hot air device, a drying device, or a dehumidifying device having a hot water pipe. The heating unit 80 includes a hot water circuit connected in a ring shape with a use side pipe 49 together with the use side pipe of the second hot water supply heat exchanger 62 B and the circulation pump 14. The use side pipe 49 has a bypass pipe that bypasses the second hot water supply heat exchanger 62B, and a mixing valve 77A is provided in the bypass pipe. Further, the use side pipe 49 is provided with a flow rate control valve 78 for controlling the flow rate to the second hot water supply heat exchanger 62B and a temperature sensor 97A.
[0009]
The hot water supply unit 10 includes a hot water supply tank 11.
One end of the hot water supply pipe 41 is connected to the bottom of the hot water supply tank 11 to form a use side pipe of the first hot water supply heat exchanger 62A, and the other end is connected to the upper part of the hot water supply tank 11, A circulation pump 12 is provided. A three-way valve 35 having a function of a mixing valve is provided in a pipe from the connection portion of the hot water supply pipe 41 to the hot water supply tank 11 to the circulation pump 12. The inflow side connection port of the three-way valve 35 is connected with a pipe 58 having an intermediate part of the hot water supply tank 11 as a connection part. On the other hand, a three-way valve 34 is provided on the other end side of the hot water supply pipe 41, and a lower return pipe 57 having a lower part of the hot water tank 11 as a connecting portion is connected to the outflow side connection port of the three-way valve 34. Yes.
The two-way valve 24 has a water supply pipe such as a water pipe connected to one side and a water discharge pipe 43 in the hot water supply unit 10 connected to the other side.
The mixing valve 25 has a hot water supply pipe 42 connected to one inflow side connection port, a water discharge pipe 43 connected to the other inflow side connection port, and a first usage side pipe 44 connected to the outflow side connection port.
One end of the hot water supply pipe 42 is connected to the upper part of the hot water supply tank 11. In addition, one end of the first use side pipe 44 is connected to a faucet for hot water supply such as a bathroom, a kitchen, or a bathroom. The water supply pipe 45 is branched from the middle of the water discharge pipe 43 and is connected to the bottom of the hot water supply tank 11.
[0010]
First, a hot water storage operation mode, which is a hot water tank heating operation, will be described with reference to FIG.
In the hot water storage operation mode, the inflow side connection port of the three-way valve 35 communicates with the hot water supply pipe 41 side, and the outflow side connection port of the three-way valve 34 communicates with the hot water supply pipe 41 side.
Accordingly, when the circulation pump 12 is operated, the water flowing out from the lower portion of the hot water supply tank 11 passes through the three-way valve 35, the circulation pump 12, the first hot water supply heat exchanger 62A, and the three-way valve 34 in order, and again the hot water supply tank. 11 from the top.
On the other hand, the heat pump unit 60 also operates. The refrigerant compressed by the compressor 61 flows into the first hot water supply heat exchanger 62A through the control valve 66H, and dissipates heat in the first hot water supply heat exchanger 62A. The refrigerant flowing out of the first hot water supply heat exchanger 62A is depressurized by the control valve 66C, then absorbs heat by the heat source side heat exchanger 64, and enters the compressor 61 in a gas state via the control valve 66D. Inhaled.
Therefore, in the first hot water supply heat exchanger 62 A, the heat of the refrigerant flowing through the refrigeration cycle is transmitted to the water flowing through the hot water supply pipe 41, and the heated water becomes warm water and is stored in the hot water supply tank 11. At this time, since hot water flows in from the upper part of the hot water supply tank 11 and cold water flows out from the lower part of the hot water supply tank 11, the hot water is stored in the upper layer in the hot water supply tank 11, and this hot water layer gradually thickens. Then, a temperature sensor (not shown) provided on the lower side of the hot water supply tank 11 detects a state in which sufficient hot water is accumulated in the hot water supply tank 11 and ends the boiling operation.
[0011]
Next, the 1st heating operation mode which operates a heating unit using the hot water in a hot-water supply tank is demonstrated using FIG.
In the first heating operation mode, the inflow side connection port of the three-way valve 35 communicates with the pipe 58 side, and the outflow side connection port of the three-way valve 34 communicates with the lower return pipe 57 side.
Accordingly, when the circulation pump 12 is operated, the water flowing out from the intermediate portion of the hot water supply tank 11 passes through the three-way valve 35, the circulation pump 12, the first hot water supply heat exchanger 62A, and the three-way valve 34 in order, and again supplies hot water. It flows from the lower part of the tank 11.
On the other hand, the heat pump unit 60 also operates. The refrigerant compressed by the compressor 61 flows into the second hot water supply heat exchanger 62B through the control valve 66A, and dissipates heat in the second hot water supply heat exchanger 62B. The refrigerant flowing out of the second hot water supply heat exchanger 62B is depressurized by the control valve 66B, then absorbs heat by the first hot water supply heat exchanger 62A, and passes through the control valves 66G, 66I, 66D. The gas is sucked into the compressor 61.
Therefore, in the second hot water supply heat exchanger 62B, the heat of the refrigerant flowing in the refrigeration cycle is transmitted to the water flowing in the use side pipe 49, and the heated water becomes hot water and circulates in the use side pipe 49, thereby heating. Heating can be performed by the unit 80. A part of the hot water discharged from the circulation pump 14 by the mixing valve 77A provided in the use side piping 49 does not pass through the second hot water supply heat exchanger 62B, but the second hot water supply heat exchange. It is mixed with the hot water flowing out from the vessel 62B and flows to the heating unit 80. At this time, the flow rate of the hot water to the second hot water supply heat exchanger 62B is controlled by the flow rate control valve 78 so that the temperature detected by the temperature sensor 97A is compared with the set temperature and brought close to the set temperature. For example, if the temperature detected by the temperature sensor 97A is close to the set temperature, the opening degree of the flow rate control valve 78 is narrowed to reduce the amount of hot water flowing through the second hot water supply heat exchanger 62B. In this manner, the flow rate control valve 78 reduces the amount of hot water flowing to the second hot water supply heat exchanger 62B and performs temperature control on the heating unit 80 side, whereby the refrigerant in the second hot water supply heat exchanger 62B. The amount of heat released can be suppressed.
[0012]
In the first hot water supply heat exchanger 62A, the heat of hot water flowing through the hot water supply pipe 41 is transmitted to the refrigerant flowing through the refrigeration cycle.
At this time, since warm water flows out from the middle part of the hot water supply tank 11 and cold water flows from the lower part of the hot water supply tank 11, the hot water is stored in the upper layer in the hot water tank 11, and the warm water below the middle part is stored. The layer becomes thinner gradually. Then, a temperature sensor (not shown) provided in the intermediate portion of the hot water tank 11 is in a state where there is not enough hot water for heating in the hot water tank 11, for example, the hot water temperature in the intermediate portion of the hot water tank 11 is lower than a predetermined value. The first heating operation is terminated by detecting that the temperature has become low. The first heating operation may be terminated by detecting a case where the temperature of the hot water led to the first hot water supply heat exchanger 62A is equal to or lower than a predetermined temperature. Moreover, when ending the first heating operation, the mode is switched to the second heating operation mode. Normally, since the heating operation is continued on the heating unit 80 side, the refrigeration cycle is switched at the end of the first heating operation state, and the heating operation is continued in the second heating operation mode.
[0013]
In the first heating operation mode, the temperature of the hot water flowing from the hot water supply tank 11 into the first hot water supply heat exchanger 62A is controlled to be within a predetermined temperature range.
As one control method for maintaining a predetermined temperature range, the three-way valve 35 is caused to function as a mixing valve, medium-temperature water is caused to flow out from the intermediate portion of the hot water tank 11 through the pipe 58, and from the lower portion of the hot water tank 11 through the hot water supply pipe 41. The low temperature water is allowed to flow out, and the medium temperature water and the low temperature water are mixed by the three-way valve 35. This control method is effective when there is a temperature difference between the middle part and the lower part of the hot water tank 11.
As another control method for maintaining the predetermined temperature range, the low temperature water discharged from the lower part of the hot water supply tank 11 through the hot water supply pipe 41 and radiated by the first hot water supply heat exchanger 62A is used as the hot water supply tank 11. It is made to flow in from the lower part of this by the lower return pipe 57. This control method is effective when the temperature in the hot water supply tank 11 is mostly high except for the lower layer.
As still another control method for maintaining the predetermined temperature range, the flow rate of hot water flowing from the hot water supply tank 11 to the first hot water supply heat exchanger 62A is operated intermittently or the capacity of the circulation pump 12 is controlled. To change. This control method is effective when the temperature in the hot water supply tank 11 is almost in a high temperature state.
As yet another control method for maintaining the predetermined temperature range, the outflow position from the hot water supply tank 11 may be changed. In the case of the illustration, it is possible to change the outflow position at the two locations of the intermediate portion and the bottom portion, but by providing a plurality of outlets with different heights in the intermediate portion, more accurate control is possible. Can be done.
Although several control methods for maintaining the predetermined temperature range have been described above, these control methods may be used alone or in combination with several different control methods.
The first heating operation mode is controlled so as to be performed when the outside air temperature is detected and the outside air temperature is lower than a predetermined value and the hot water temperature in the hot water supply tank 11 is at a sufficient temperature. Is preferred.
[0014]
Next, the second heating operation mode will be described with reference to FIG.
In the heat pump unit 60, the refrigerant compressed by the compressor 61 flows into the second hot water supply heat exchanger 62B through the control valve 66A, and dissipates heat in the second hot water supply heat exchanger 62B. The refrigerant flowing out of the second hot water supply heat exchanger 62B bypasses the first hot water supply heat exchanger 62A, is depressurized by the control valve 66C via the control valves 66F and 66G, and then the heat source side. Heat is absorbed by the heat exchanger 64 and is sucked into the compressor 61 in a gas state via the control valve 66D.
Therefore, in the second hot water supply heat exchanger 62B, the heat of the refrigerant flowing in the refrigeration cycle is transmitted to the water flowing in the use side pipe 49, and the heated water becomes hot water and circulates in the use side pipe 49, thereby heating. Heating can be performed by the unit 80. A part of the hot water discharged from the circulation pump 14 by the mixing valve 77A provided in the use side piping 49 does not pass through the second hot water supply heat exchanger 62B, but the second hot water supply heat exchange. It is mixed with the hot water flowing out from the vessel 62B and flows to the heating unit 80. At this time, the flow rate of the hot water to the second hot water supply heat exchanger 62B is controlled by the flow rate control valve 78 so that the temperature detected by the temperature sensor 97A is compared with the set temperature and brought close to the set temperature. For example, when the temperature detected by the temperature sensor 97A is close to the set temperature, the opening degree of the flow control valve 78 is narrowed to reduce the amount of hot water flowing through the second hot water supply heat exchanger 62B. In this manner, the flow rate control valve 78 reduces the amount of hot water flowing to the second hot water supply heat exchanger 62B and performs temperature control on the heating unit 80 side, whereby the refrigerant in the second hot water supply heat exchanger 62B. The amount of heat released can be suppressed.
As shown in the present embodiment, in the second heating operation mode, it is preferable not to flow the refrigerant of the refrigeration cycle to the first hot water supply heat exchanger 62A.
When the outside air temperature becomes higher than the predetermined temperature, or when the heating load in the heating unit 80 is reduced and there is a surplus in the refrigeration capacity, the second heating operation is terminated and the heating hot water storage operation mode is completed. Switch to. The switching from the second heating operation mode to the heating hot water storage operation mode is performed when the high-pressure side refrigerant temperature is detected by the temperature sensors 96A and 96B and a temperature higher than a predetermined temperature is detected.
[0015]
Next, the heating and hot water storage operation mode will be described with reference to FIG.
The inflow side connection port of the three-way valve 35 communicates with the hot water supply pipe 41 side, and the outflow side connection port of the three-way valve 34 communicates with the hot water supply pipe 41 side.
Accordingly, when the circulation pump 12 is operated, the water flowing out from the lower portion of the hot water supply tank 11 passes through the three-way valve 35, the circulation pump 12, the first hot water supply heat exchanger 62A, and the three-way valve 34 in order, and again the hot water supply tank. 11 from the top.
On the other hand, the heat pump unit 60 also operates. The refrigerant compressed by the compressor 61 flows into the second hot water supply heat exchanger 62B through the control valve 66A, and dissipates heat in the second hot water supply heat exchanger 62B. Then, the refrigerant flowing out of the second hot water supply heat exchanger 62B flows into the first hot water supply heat exchanger 62A through the control valve 66B, and further radiates heat in the first hot water supply heat exchanger 62A. The refrigerant flowing out of the first hot water supply heat exchanger 62A is depressurized by the control valve 66C, then absorbs heat by the heat source side heat exchanger 64, and enters the compressor 61 in a gas state via the control valve 66D. Inhaled.
Therefore, in the second hot water supply heat exchanger 62B, the heat of the refrigerant flowing in the refrigeration cycle is transmitted to the water flowing in the use side pipe 49, and the heated water becomes hot water and circulates in the use side pipe 49, thereby heating. Heating can be performed by the unit 80. A part of the hot water discharged from the circulation pump 14 by the mixing valve 77A provided in the use side piping 49 does not pass through the second hot water supply heat exchanger 62B, but the second hot water supply heat exchange. It is mixed with the hot water flowing out from the vessel 62B and flows to the heating unit 80. At this time, the flow rate of the hot water to the second hot water supply heat exchanger 62B is controlled by the flow rate control valve 78 so that the temperature detected by the temperature sensor 97A is compared with the set temperature and brought close to the set temperature. For example, when the temperature detected by the temperature sensor 97A is close to the set temperature, the opening degree of the flow control valve 78 is narrowed to reduce the amount of hot water flowing through the second hot water supply heat exchanger 62B. In this manner, the flow rate control valve 78 reduces the amount of hot water flowing to the second hot water supply heat exchanger 62B and performs temperature control on the heating unit 80 side, whereby the refrigerant in the second hot water supply heat exchanger 62B. The amount of heat released can be suppressed. Therefore, it is possible to secure a heat radiation amount in the first hot water supply heat exchanger 62A.
[0016]
In the first hot water supply heat exchanger 62 A, the heat of the refrigerant flowing through the refrigeration cycle is transmitted to the water flowing through the hot water supply pipe 41, and the heated water becomes warm water and is stored in the hot water supply tank 11. At this time, since hot water flows in from the upper part of the hot water supply tank 11 and cold water flows out from the lower part of the hot water supply tank 11, the hot water is stored in the upper layer in the hot water supply tank 11, and this hot water layer gradually thickens. Then, a temperature sensor (not shown) provided on the lower side of the hot water supply tank 11 detects a state in which sufficient hot water is accumulated in the hot water supply tank 11 and ends the heating hot water storage operation mode. After the heating hot water storage operation mode ends, the second heating operation mode can be switched to the first heating operation mode.
FIG. 6 shows a state in which sufficient hot water is accumulated in the hot water supply tank 11 and the heating / hot water storage operation mode is ended and then the second heating operation mode is switched.
[0017]
Next, a hot water supply operation in the case where hot water in the hot water supply tank is used for hot water supply will be described with reference to FIG. FIG. 7 shows the hot water supply operation in the first heating operation mode.
Hot water can be used by opening the faucet connected to the first usage side pipe 44. The hot water supply temperature is adjusted by changing the mixing ratio of the inflow side passage of the mixing valve 25. When the hot water supply temperature is increased, the inflow amount from the hot water supply pipe 42 is increased, and when the hot water supply temperature is decreased, the inflow amount from the water discharge pipe 43 is increased.
The pressure in the hot water supply tank 11 decreases as hot water flows out from the hot water supply pipe 42. Accordingly, water flows into the hot water supply tank 11 from the water supply pipe 45 by the amount of hot water flowing out from the hot water supply pipe 42. When the temperature sensor detects that the amount of hot water in the hot water supply tank 11 is less than a predetermined amount, the hot water storage operation mode that is a boiling operation is resumed.
[0018]
Next, another operation method of the first heating operation mode will be described with reference to FIG.
The inflow side connection port of the three-way valve 35 communicates with the pipe 58 side, and the outflow side connection port of the three-way valve 34 communicates with the lower return pipe 57 side.
Accordingly, when the circulation pump 12 is operated, the water flowing out from the intermediate portion of the hot water supply tank 11 passes through the three-way valve 35, the circulation pump 12, the first hot water supply heat exchanger 62A, and the three-way valve 34 in order, and again supplies hot water. It flows from the lower part of the tank 11.
On the other hand, the heat pump unit 60 also operates. The refrigerant compressed by the compressor 61 flows into the second hot water supply heat exchanger 62B through the control valve 66A, and dissipates heat in the second hot water supply heat exchanger 62B. The refrigerant flowing out from the second hot water supply heat exchanger 62B is depressurized by the control valve 66B, then absorbs heat by the first hot water supply heat exchanger 62A, and passes through the control valve 66C to perform heat source side heat exchange. The heat is further absorbed by the compressor 64 and is sucked into the compressor 61 in a gas state via the control valve 66D.
Therefore, in the second hot water supply heat exchanger 62B, the heat of the refrigerant flowing in the refrigeration cycle is transmitted to the water flowing in the use side pipe 49, and the heated water becomes hot water and circulates in the use side pipe 49, thereby heating. Heating can be performed by the unit 80. A part of the hot water discharged from the circulation pump 14 by the mixing valve 77A provided in the use side piping 49 does not pass through the second hot water supply heat exchanger 62B, but the second hot water supply heat exchange. It is mixed with the hot water flowing out from the vessel 62B and flows to the heating unit 80. At this time, the flow rate of the hot water to the second hot water supply heat exchanger 62B is controlled by the flow rate control valve 78 so that the temperature detected by the temperature sensor 97A is compared with the set temperature and brought close to the set temperature. For example, when the temperature detected by the temperature sensor 97A is close to the set temperature, the opening degree of the flow control valve 78 is narrowed to reduce the amount of hot water flowing through the second hot water supply heat exchanger 62B. In this manner, the flow rate control valve 78 reduces the amount of hot water flowing to the second hot water supply heat exchanger 62B and performs temperature control on the heating unit 80 side, whereby the refrigerant in the second hot water supply heat exchanger 62B. The amount of heat released can be suppressed.
[0019]
In the first hot water supply heat exchanger 62A, the heat of hot water flowing through the hot water supply pipe 41 is transmitted to the refrigerant flowing through the refrigeration cycle. In the heat source side heat exchanger 64 as well, the refrigerant absorbs heat from the atmosphere.
At this time, since warm water flows out from the middle part of the hot water supply tank 11 and cold water flows from the lower part of the hot water supply tank 11, the hot water is stored in the upper layer in the hot water tank 11, and the warm water below the middle part is stored. The layer becomes thinner gradually. Then, a temperature sensor (not shown) provided in the intermediate portion of the hot water tank 11 is in a state where there is not enough hot water for heating in the hot water tank 11, for example, the hot water temperature in the intermediate portion of the hot water tank 11 is lower than a predetermined value. The first heating operation is terminated by detecting that the temperature has become low. The first heating operation may be terminated by detecting a case where the temperature of the hot water led to the first hot water supply heat exchanger 62A is equal to or lower than a predetermined temperature. In addition, when complete | finishing 1st heating operation, it switches to 2nd heating operation mode. Normally, since the heating operation is continued on the heating unit 80 side, the refrigeration cycle is switched at the end of the first heating operation state, and the heating operation is continued in the second heating operation mode.
[0020]
In the present embodiment, as in the first heating operation mode already described with reference to FIG. 3, the temperature of the hot water flowing from the hot water supply tank 11 into the first hot water supply heat exchanger 62A is set to a predetermined temperature. Control to be within range.
In addition, it is preferable to control so that 1st heating operation mode by a present Example may detect outside temperature, and outside temperature is higher than a predetermined value.
[0021]
Hereinafter, a heat pump type water heater according to another embodiment of the present invention will be described with reference to the drawings. In addition, the same number is attached | subjected to the member which has the same function, and description is abbreviate | omitted.
FIG. 9 is a circuit configuration diagram of a heat pump water heater according to another embodiment.
The heat pump type hot water heater according to the present embodiment is provided with a boiling function for heating the bath water in the bathtub 70 and a pouring function for pouring the hot water in the bathtub 70 in the above embodiment.
The boiling function for heating the bathtub water in the bathtub 70 leads the bathtub water in the bathtub 70 to the bathtub heat exchanger 15 arranged in the hot water supply tank 11, and the hot water heated by the bathtub heat exchanger 15 is taken into the bathtub. It is comprised by the piping 72 for bathtubs leading to 70, and the circulation pump 71 which circulates the warm water in this piping 72 for bathtubs. In addition, the piping for bypassing the heat exchanger 15 for bathtubs is provided in the piping 72 for bathtubs, and the mixing valve 73 is provided in this bypass piping. A part of the hot water discharged from the circulation pump 71 is mixed by the mixing valve 73 with the hot water flowing out of the bathtub heat exchanger 15 without passing through the bathtub heat exchanger 15 and flows into the bathtub 70.
The hot water pouring function for pouring into the bathtub 70 includes a cold water side pouring pipe 54A branched from the outlet pipe 43, a hot water side pouring pipe 54B branched from the outlet pipe 42, and a cold water side pouring pipe. 54A and hot water side pouring pipe 54B are connected to the inflow side connection port, a pouring pipe 55 is connected to the outflow side connection port of the mixing valve 53, and this pouring pipe 55 is provided. The pouring pipe 55 is connected to the bathtub pipe 72.
According to the present embodiment, it is possible to operate in the first heating operation mode and the second heating operation mode described in the above embodiment, and it is possible to boil and pour the bathtub 70.
[0022]
FIG. 10 is a circuit configuration diagram of a heat pump type water heater according to still another embodiment.
The heat pump type hot water heater according to the present embodiment is obtained by changing the configuration of the hot water supply unit 10, and the configuration and operation of the heat pump unit 60 are the same as those of the above embodiment, and thus description thereof is omitted.
One end of the hot water supply pipe 41 is connected to the bottom of the hot water supply tank 11 to form a use side pipe of the first hot water supply heat exchanger 62A, and the other end is connected to the upper part of the hot water supply tank 11, A circulation pump 12 is provided. A three-way valve 33 that controls the outflow of stored water in the hot water supply tank 11 is provided on one end side of the hot water supply pipe 41. A circulation pump 12 is provided in a hot water supply pipe 41 between the three-way valve 33 and the first hot water supply heat exchanger 62A. On the other hand, a three-way valve 34 is provided on the other end of the hot water supply pipe 41, that is, on the hot water supply pipe 41 between the first hot water supply heat exchanger 62 A and the hot water supply tank 11. A lower return pipe 57 connected to the lower part of the hot water supply tank 11 is provided at the other outlet side opening of the three-way valve 34. The other end of the hot water supply pipe 41 is connected to the upper portion of the tank 11 via the three-way valve 23. The three-way valve 36 is an outflow side pipe of the circulation pump 12 and is provided in a hot water supply pipe 41 disposed in the hot water supply unit 10. The other outflow side opening of the three-way valve 36 is provided with a pipe 58, and the other end of the pipe 58 is an inflow side pipe of the three-way valve 34 for hot water supply disposed in the hot water supply unit 10. A pipe 41 is provided.
[0023]
One end of the heat source side pipe 46 is connected to the outflow side connection port of the three-way valve 23, constitutes the heat source side pipe of the bathtub heat exchanger 13 B, and the other end is connected to the inflow side connection port of the three-way valve 33. . A flow control valve 26 is provided in the heat source side pipe 46.
Further, the heat source side pipe 46 is provided with a temperature sensor 91 on the upstream side of the bathtub heat exchanger 13B and a temperature sensor 92 on the downstream side of the bathtub heat exchanger 13B. Moreover, the piping 72 for bathtubs has provided the temperature sensor 93 in the upstream of the heat exchanger 13B for bathtubs. The heat source side piping 46 is provided with a flow rate sensor 94.
In the present embodiment, in the bathtub water heating operation using the hot water in the hot water supply tank 11, the three-way valve 33 closes the connection pipe to the hot water supply tank 11 and connects the heat source side pipe 46 and the hot water supply pipe 41. . In addition, the three-way valve 34 opens the outflow side connection port to the lower return pipe 57 and blocks the flow to the upper part of the hot water supply tank 11. The three-way valve 36 opens the outflow side connection port to the pipe 58 and closes the outflow side connection port to the hot water supply pipe 41 connected to the first hot water supply heat exchanger 62A.
Therefore, by operating the circulation pump 12, the hot water flowing out from the upper part of the hot water supply tank 11 is sent to the three-way valve 23, the bath heat exchanger 13B, the three-way valve 33, the circulation pump 12, the three-way valve 36, the three-way valve 34, the lower part. It passes through the return pipe 57 in order and flows from the lower part of the hot water supply tank 11.
According to the present embodiment, the bath water heating operation can be performed using the circulation pump 12 used in the hot water storage operation mode, the first heating operation mode, and the second heating operation mode described in the above embodiment. . Moreover, useless heat radiation can be prevented by using a circulation path in the hot water supply unit 10.
[0024]
Moreover, according to the present Example, the bath water boiling operation using the 1st hot water supply heat exchanger 62A can also be performed.
In the bathtub water heating operation using the first hot water supply heat exchanger 62A, the outflow side connection port of the three-way valve 36 is used as the hot water supply pipe 41, and the outflow side connection port to the pipe 58 is closed. Further, the hot water supply pipe 41 and the heat source side pipe 46 are communicated with each other with the inflow side connection port of the three-way valve 23 as the hot water supply pipe 41 and the outflow side connection port as the heat source side pipe 46.
In the operation in this case, the heat pump unit 60 is also operated. The refrigerant compressed by the compressor 61 radiates heat by the first hot water supply heat exchanger 62A, is depressurized by the control valve 66C, absorbs heat by the heat source side heat exchanger 64, and enters the compressor 61 in a gas state. Inhaled.
Therefore, by operating the circulation pump 12, the low-temperature water that has passed through the bathtub heat exchanger 13B flows into the first hot water supply heat exchanger 62A through the three-way valve 33 and the circulation pump 12. Then, the high-temperature water heated by the first hot water supply heat exchanger 62A flows again into the bathtub heat exchanger 13B via the three-way valve 34 and the three-way valve 23.
[0025]
In this operation mode, when the capacity in the first hot water supply heat exchanger 62A exceeds the load in the bathtub 70, the hot water supply tank 11 can be simultaneously heated.
In this operation mode, a part of high-temperature water is caused to flow out to the hot water supply pipe 41 connected to the hot water supply tank 11 which is the other outflow side opening of the three-way valve 23. In addition, the opening degree of the three-way valve 33 is adjusted, and the low temperature water in the hot water supply tank 11 is allowed to flow out.
In this way, by returning a part of the high-temperature water into the hot water supply tank 11, the hot water can be accumulated in the hot water supply tank 11 while continuing the bath water boiling operation.
In addition, in this case, the relationship between the capacity of the first hot water supply heat exchanger 62A and the load of the bathtub 70 can be determined by the temperature detected by the temperature sensor 92, as well as the detection of the temperature sensor 91 and the temperature sensor 92. More accurate determination can be made from the temperature. The amount of hot water distributed to the hot water supply tank 11 can also be adjusted by the three-way valve 23 or the three-way valve 33, but the flow rate sensor 94 detects the amount of hot water flowing through the heat source side pipe 46, and the flow control valve. It can also be adjusted by controlling 26.
[0026]
FIG. 11 is a circuit configuration diagram of a heat pump type water heater according to still another embodiment.
In this embodiment, the configuration of the hot water supply unit 10 is the same as that of the embodiment shown in FIG. 9, and the basic configuration and operation of the heat pump unit 60 are the same as those of the embodiment shown in FIG.
The heat pump type water heater according to the present embodiment is obtained by adding a bathroom drying unit 90 to the heating unit 80. The bathroom drying unit 90 is provided in parallel with the heating unit 80, and is configured to be connected to the second use side pipe 52 in a ring shape together with the use side pipe and the circulation pump 14 of the second hot water supply heat exchanger 62B. Has been. The second usage-side pipe 52 has a bypass pipe that bypasses the second hot water supply heat exchanger 62B, and a mixing valve 77B is provided in the bypass pipe. The second usage-side piping 52 shares a part of the flow path with the usage-side piping 49, has a flow rate control valve 78 that controls the flow rate to the second hot water supply heat exchanger 62B, and a temperature sensor 97B. Is provided.
In the second hot water supply heat exchanger 62B, the heat of the refrigerant flowing through the refrigeration cycle is transferred to the water flowing through the usage side piping 49 and the second usage side piping 52, and the heated water becomes warm water and becomes the usage side piping 49. And it circulates through the 2nd utilization side piping 52, it can heat with the heating unit 80, and bathroom drying can be performed with the bathroom drying unit 90. FIG. A part of the hot water discharged from the circulation pump 14 by the mixing valve 77A provided in the use side piping 49 does not pass through the second hot water supply heat exchanger 62B, but the second hot water supply heat exchange. It is mixed with the hot water flowing out from the vessel 62B and flows to the heating unit 80. Further, a part of the hot water discharged from the circulation pump 14 by the mixing valve 77B provided in the second usage side pipe 52 does not pass through the second hot water supply heat exchanger 62B, but the second hot water supply. It is mixed with the hot water flowing out from the heat exchanger 62B and flows to the bathroom drying unit 90. At this time, the flow rate of the hot water to the second hot water supply heat exchanger 62B is such that the temperatures detected by the temperature sensors 97A and 97B are compared with the set temperatures, and the flow rate control valve 78 is brought close to the set temperature. To control. For example, when the temperatures detected by the temperature sensors 97A and 97B are close to the set temperature, the opening degree of the flow control valve 78 is narrowed to reduce the amount of hot water flowing through the second hot water supply heat exchanger 62B. In this manner, the flow rate control valve 78 reduces the amount of hot water flowing to the second hot water supply heat exchanger 62B and performs temperature control on the heating unit 80 side, whereby the refrigerant in the second hot water supply heat exchanger 62B. The amount of heat released can be suppressed. Moreover, adjustment of the amount of warm water to the heating unit 80 and the bathroom drying unit 90 is performed by the mixing valve 77A and the mixing valve 77B.
According to this embodiment, the bathroom drying unit 90 can be operated using the second hot water supply heat exchanger 62B.
[0027]
FIG. 12 is a circuit configuration diagram of a heat pump type water heater according to still another embodiment.
In this embodiment, the configuration and operation of the hot water supply unit 10 are the same as those in the embodiment shown in FIG. 10, and the configuration and operation of the heat pump unit 60 are the same as those in the embodiment shown in FIG. .
According to the present embodiment, the heating of the bathtub 70 and the bathroom drying unit 90 can be used together with the heating unit 80.
[0028]
【The invention's effect】
According to the present invention, the hot water in the hot water supply tank is used for the heating operation, and the heating operation can be continued even when the necessary amount of hot water is not stored in the hot water supply tank.
Moreover, according to this invention, warm water can be stored in the hot water supply tank, performing the heating operation using the hot water supply heat exchanger.
[Brief description of the drawings]
FIG. 1 is a circuit configuration diagram of a heat pump type hot water heater according to an embodiment of the present invention. FIG. 2 is a circuit configuration diagram showing a hot water storage operation mode of the heat pump type hot water heater according to the present embodiment. FIG. 4 is a circuit configuration diagram showing a second heating operation mode of the heat pump type hot water heater according to the present embodiment. FIG. 5 is a circuit configuration diagram showing a second heating operation mode of the heat pump type water heater according to the present embodiment. FIG. 6 is a circuit configuration diagram showing an end state of the heating hot water storage operation mode of the heat pump type hot water heater according to the present embodiment. FIG. 7 is a first circuit diagram of the heat pump hot water system according to the present example. FIG. 8 is a circuit configuration diagram showing another first heating operation mode of the heat pump water heater according to the present embodiment. FIG. 10 is a circuit configuration diagram of a heat pump water heater according to still another embodiment of the present invention. FIG. 11 is a circuit configuration diagram of a heat pump water heater according to still another embodiment of the present invention. Circuit configuration diagram [FIG. 12] Circuit configuration diagram of a heat pump type water heater according to still another embodiment of the present invention [Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Hot water supply unit 11 Hot water supply tank 12 Circulation pump 13 Heat exchanger for heating 14 Circulation pump 60 Heat pump unit 80 Heating unit

Claims

圧縮機、給湯用熱交換器、膨張弁、及び熱源側熱交換器を配管で接続した冷凍サイクルを有するヒートポンプユニットと、給湯タンクを有する給湯ユニットと、温水配管を備えた床暖房装置、温風装置、乾燥装置、又は除湿装置などの空調機器からなる暖房ユニットとを備え、前記給湯用熱交換器として、前記給湯タンクの水と熱交換する第１の給湯用熱交換器と、前記暖房ユニットの熱源側熱交換器として用いる第２の給湯用熱交換器とを有するヒートポンプ式給湯機であって、
前記熱源側熱交換器を蒸発器として用い、前記第１の給湯用熱交換器を用いて前記給湯タンク内に温水を貯留する貯湯運転モードと、
前記第１の給湯用熱交換器に前記給湯タンク内の温水を導いて前記第１の給湯用熱交換器を蒸発器として用いて温水から冷媒に熱を放熱し、前記第２の給湯用熱交換器を用いて前記暖房ユニットを運転する第１の暖房運転モードと、
前記熱源側熱交換器を蒸発器として用い、前記第２の給湯用熱交換器を用いて前記暖房ユニットを運転する第２の暖房運転モードと、
前記熱源側熱交換器を蒸発器として用い、前記第２の給湯用熱交換器を用いて前記暖房ユニットを運転し、さらに前記第１の給湯用熱交換器を用いて前記給湯タンク内に温水を貯留する暖房貯湯運転モードとを有し、
前記暖房貯湯運転モードでは、前記第１の給湯用熱交換器よりも前記第２の給湯用熱交換器を前記圧縮機の吐出側に配置させて運転することを特徴とするヒートポンプ式給湯機。Heat pump unit having a refrigeration cycle in which a compressor, a hot water supply heat exchanger, an expansion valve, and a heat source side heat exchanger are connected by piping, a hot water supply unit having a hot water supply tank, a floor heating device provided with hot water piping, hot air A heating unit comprising an air-conditioning device such as a device, a drying device, or a dehumidifying device, and as the hot water supply heat exchanger, a first hot water supply heat exchanger that exchanges heat with water in the hot water supply tank, and the heating unit A heat pump type water heater having a second heat exchanger for hot water supply used as a heat source side heat exchanger of
A hot water storage operation mode in which the heat source side heat exchanger is used as an evaporator and hot water is stored in the hot water supply tank using the first hot water supply heat exchanger;
The hot water in the hot water tank is led to the first hot water supply heat exchanger, the first hot water supply heat exchanger is used as an evaporator to radiate heat from the hot water to the refrigerant, and the second hot water supply heat. A first heating operation mode in which the heating unit is operated using an exchanger;
A second heating operation mode in which the heat source side heat exchanger is used as an evaporator and the heating unit is operated using the second hot water supply heat exchanger;
The heat source side heat exchanger is used as an evaporator, the heating unit is operated using the second hot water supply heat exchanger, and hot water is added into the hot water supply tank using the first hot water supply heat exchanger. Heating and hot water storage operation mode for storing
In the heating and hot water storage operation mode, the heat pump type hot water heater is operated by disposing the second hot water supply heat exchanger on the discharge side of the compressor rather than the first hot water supply heat exchanger.

前記第１の暖房運転モードでは、前記給湯タンクの中間部から温水を流出させ、前記第１の給湯用熱交換器で放熱させた温水を、前記給湯タンクの下部から流入させることを特徴とする請求項１に記載のヒートポンプ式給湯機。 In the first heating operation mode, hot water is caused to flow out from an intermediate portion of the hot water supply tank, and hot water radiated by the first hot water supply heat exchanger is caused to flow from a lower portion of the hot water supply tank. The heat pump type water heater according to claim 1 .

前記第１の暖房運転モードでは、前記給湯タンクから前記第１の給湯用熱交換器に流入させる温水の温度を、所定の温度範囲となるように制御することを特徴とする請求項１または請求項２に記載のヒートポンプ式給湯機。In the first heating operation mode, the hot water temperature to flow into the heat exchanger for the first hot water from the hot water supply tank, according to claim 1 or claim, characterized by controlling to a predetermined temperature range Item 3. A heat pump type water heater according to Item 2 .

前記第１の暖房運転モードにおいて、前記給湯タンクの中間部から中温水を、前記給湯タンクの下部から低温水を流出させ、前記中温水と前記低温水とを混合することを特徴とする請求項１から請求項３のいずれかに記載のヒートポンプ式給湯機。In the first heating operation mode, the claims wherein the medium-temperature water from an intermediate portion of the hot water supply tank, said drained the cold water from the bottom of the hot water supply tank, characterized by mixing the said in hot water and the cold water The heat pump type water heater according to any one of claims 1 to 3 .

前記第１の暖房運転モードにおいて、前記給湯タンクから前記第１の給湯用熱交換器に流入させる温水の流量を変更することを特徴とする請求項１から請求項４のいずれかに記載のヒートポンプ式給湯機。The heat pump according to any one of claims 1 to 4, wherein in the first heating operation mode, a flow rate of hot water flowing from the hot water supply tank into the first hot water supply heat exchanger is changed. Type water heater.

前記第１の暖房運転モードにおいて、前記給湯タンクからの流出位置を変更することを特徴とする請求項２から請求項５のいずれかに記載のヒートポンプ式給湯機。The heat pump type hot water heater according to any one of claims 2 to 5 , wherein an outflow position from the hot water supply tank is changed in the first heating operation mode.

前記給湯タンク内の温水温度が所定値よりも低い場合に、前記暖房貯湯運転モードを行うことを特徴とする請求項１から請求項６のいずれかに記載のヒートポンプ式給湯機。 The heat pump hot water supply apparatus according to any one of claims 1 to 6 , wherein the heating hot water storage operation mode is performed when a hot water temperature in the hot water supply tank is lower than a predetermined value.

前記暖房貯湯運転モードでは、前記第２の給湯用熱交換器の出口側の冷媒温度を所定温度に維持するように、前記第２の給湯用熱交換器の利用側配管を流れる水の流量を変更することを特徴とする請求項１から請求項７のいずれかに記載のヒートポンプ式給湯機。 In the heating and hot water storage operation mode, the flow rate of water flowing through the use side pipe of the second hot water supply heat exchanger is set so that the refrigerant temperature on the outlet side of the second hot water supply heat exchanger is maintained at a predetermined temperature. The heat pump type hot water heater according to any one of claims 1 to 7, wherein the heat pump type hot water heater is changed.

外気温度が所定値よりも低い場合に、前記第１の暖房運転モードを行うことを特徴とする請求項１から請求項８のいずれかに記載のヒートポンプ式給湯機。The heat pump type hot water heater according to any one of claims 1 to 8 , wherein the first heating operation mode is performed when an outside air temperature is lower than a predetermined value.

前記貯湯運転モードでは、前記第２の給湯用熱交換器に冷凍サイクルの冷媒を流さないことを特徴とする請求項１から請求項９のいずれかに記載のヒートポンプ式給湯機。The heat pump type hot water heater according to any one of claims 1 to 9, wherein in the hot water storage operation mode, the refrigerant of the refrigeration cycle is not allowed to flow through the second hot water supply heat exchanger.

前記第２の暖房運転モードでは、前記第１の給湯用熱交換器に冷凍サイクルの冷媒を流さないことを特徴とする請求項１から請求項１０のいずれかに記載のヒートポンプ式給湯機。The heat pump type hot water heater according to any one of claims 1 to 10, wherein in the second heating operation mode, the refrigerant of the refrigeration cycle is not allowed to flow through the first heat exchanger for hot water supply.

前記利用側配管をバイパスするバイパス配管を設け、前記バイパス配管に混合弁を設けたことを特徴とする請求項１から請求項１１のいずれかに記載のヒートポンプ式給湯機。The heat pump type hot water heater according to any one of claims 1 to 11 , wherein a bypass pipe that bypasses the use side pipe is provided, and a mixing valve is provided in the bypass pipe.

前記第１の暖房運転モードにおいて、前記第１の給湯用熱交換器に導く温水温度が所定温度以下となった場合には、前記第２の暖房運転モードに切り替えることを特徴とする請求項１から請求項１２のいずれかに記載のヒートポンプ式給湯機。In the first heating operation mode, according to claim 1 hot water temperature leading to the first hot water supply heat exchanger when it becomes less than a predetermined temperature, characterized in that switching to the second heating operation mode The heat pump type water heater according to claim 12 .

浴槽内の浴槽水を加熱する沸上手段を設け、前記沸上手段を、前記浴槽内の浴槽水を浴槽用熱交換器に導き、前記浴槽用熱交換器で加熱された温水を前記浴槽に導く浴槽用配管と、前記浴槽用配管内の温水を循環させる循環ポンプとによって構成したことを特徴とする請求項１から請求項１３のいずれかに記載のヒートポンプ式給湯機。Boiling means for heating the bathtub water in the bathtub is provided, the boiling means is used to guide the bathtub water in the bathtub to the heat exchanger for bathtubs, and the hot water heated by the bathtub heat exchanger is supplied to the bathtub. The heat pump type hot water supply apparatus according to any one of claims 1 to 13, wherein the heat pump type hot water supply apparatus is configured by a piping for a leading bathtub and a circulation pump for circulating hot water in the piping for the bathtub.

前記冷凍サイクルに用いる冷媒を二酸化炭素とし、高圧側では臨界圧を越える状態で運転することを特徴とする請求項１から請求項１４のいずれかに記載のヒートポンプ式給湯機。The heat pump type water heater according to any one of claims 1 to 14, wherein the refrigerant used in the refrigeration cycle is carbon dioxide, and the high pressure side is operated in a state exceeding a critical pressure.