JP4306055B2

JP4306055B2 - Ice storage / heat pump air conditioning system

Info

Publication number: JP4306055B2
Application number: JP32824299A
Authority: JP
Inventors: 淳一高橋; 公二永江
Original assignee: Taisei Corp; Sanyo Electric Co Ltd
Current assignee: Taisei Corp; Sanyo Electric Co Ltd
Priority date: 1999-11-18
Filing date: 1999-11-18
Publication date: 2009-07-29
Anticipated expiration: 2019-11-18
Also published as: JP2001147033A

Description

【０００１】
【発明の属する技術分野】
本発明は、氷蓄熱・ヒートポンプ式空調システムに関するものである。
【０００２】
【従来の技術】
電力平準化は社会的要望であり、エネルギーの安定的供給とエネルギーコストの低減を図るためには、昼夜間の電力負荷格差を縮小させる必要がある。
電力の夜間へのシフトの手法として、現在、蓄熱方式があり、近来、コストの安い氷蓄熱槽を備えた空冷ヒートポンプパッケージとして提供されている。
この氷蓄熱槽を備えた空冷ヒートポンプパッケージは、夜間電力を利用して氷蓄熱を行い、これを昼に利用して冷房能力のアップを図るものである。尚、氷蓄熱槽は、冷房運転においては、文字通り氷の形で熱（冷熱）を蓄えるのであるが、暖房運転においては、温水として熱を蓄えられるものである。
一方、電力のピークカットの手法として、近来、ガスエンジンにより駆動するコンプレッサーによりヒートポンプ系統を構成したガスエンジンヒートポンプパッケージが開発され、提供されている。
【０００３】
本発明は、これらの両者のピークシフト及びピークカット手法の要点を組み合わせることにより、より大きな電力のピークシフト、ピークカットを目指し、ランニングコストの大幅な低減を図ることを目的とするものである。
【０００４】
この点に関し、本発明者は、先に、ガスエンジンと電動機を昼夜で切り換えてヒートポンプ系統を構成するコンプレッサーを駆動することによりランニングコストを低減するヒートポンプ式空調システムを提案した。（特開平１０−７８２４８号公報参照。）
【０００５】
【発明が解決しようとする課題】
しかしながら上記システムでは、ガスエンジンと電動機及びコンプレッサー等のヒートポンプ系統を構成する要素を屋外機として一体に構成するため、新たな機器設計が必要となり、コスト高になるという課題を有していた。
そこで本発明はこのような課題を解決することを主な目的とするものである。
【０００６】
【課題を解決するための手段】
上述した課題を解決するために本発明では、まず第１の構成として、氷蓄熱槽と、電動機で駆動するコンプレッサーを要素とする空調システムである空冷ヒートポンプパッケージの第１の屋外機と、ガスエンジンで駆動するコンプレッサーを要素とする空調システムであるガスエンジンヒートポンプパッケージの第２の屋外機を別々に設置すると共に、氷蓄熱槽内に第１、第２の熱交換冷媒経路を構成し、第１の屋外機の冷媒経路を氷蓄熱槽内の第１の熱交換冷媒経路に接続すると共に、第２の屋外機の冷媒経路は、氷蓄熱槽内の第２の熱交換冷媒経路と屋内機に至る冷媒経路に直列に接続した構成の氷蓄熱・ヒートポンプ式空調システムを提案する。
【０００７】
また本発明では第２の構成として、氷蓄熱槽と、電動機で駆動するコンプレッサーを要素とする空調システムである空冷ヒートポンプパッケージの第１の屋外機と、ガスエンジンで駆動するコンプレッサーを要素とする空調システムであるガスエンジンヒートポンプパッケージの第２の屋外機を別々に設置すると共に、夫々に対応して氷蓄熱槽内に第１、第２の熱交換冷媒経路を構成し、第１の屋外機の冷媒経路は、氷蓄熱槽内の第１の熱交換冷媒経路と、第１の屋内機に至る冷媒経路に並列に接続して、それらを切り換える切換弁機構を構成すると共に、第２の屋外機の冷媒経路は、氷蓄熱槽内の第２の熱交換冷媒経路と第２の屋内機に至る冷媒経路に直列に接続した構成の氷蓄熱・ヒートポンプ式空調システムを提案する。
【０００８】
また本発明では第３の構成として、氷蓄熱槽と、電動機で駆動するコンプレッサーを要素とする空調システムである空冷ヒートポンプパッケージの第１の屋外機と、ガスエンジンで駆動するコンプレッサーを要素とする空調システムであるガスエンジンヒートポンプパッケージの第２の屋外機を別々に設置すると共に、夫々に対応して氷蓄熱槽内に第１、第２の熱交換冷媒経路を構成し、第１の屋外機の冷媒経路は、氷蓄熱槽内の第１の熱交換冷媒経路と、第１の屋内機に至る冷媒経路に切換弁機構により直列及び並列に接続可能な構成とすると共に、第２の屋外機の冷媒経路は、氷蓄熱槽内の第２の熱交換冷媒経路と第２の屋内機に至る冷媒経路に直列に接続した氷蓄熱・ヒートポンプ式空調システムを提案する。
【０００９】
そして本発明では、以上の構成において、第２の熱交換冷媒経路をバイパスするバイパス経路を構成し、それらを切り換える切換弁機構を構成した氷蓄熱・ヒートポンプ式空調システムを提案する。
【００１０】
また以上の構成において、第２の熱交換冷媒経路に対応する切換弁機構は、例えば、バイパス経路に設けた開閉弁と、バイパス経路の両端側と第２の熱交換冷媒経路の両端側との間に夫々設けた開閉弁とから構成することができる。
【００１１】
また上記第２の構成において、第１の熱交換冷媒経路に対応する切換弁機構は、第１の熱交換冷媒経路の両側の夫々に対応した開閉弁と、第１の屋内機の冷媒経路の両側の夫々に対応した開閉弁とから構成することができる。
【００１２】
また上記第２の構成において、第１の屋外機は冷房専用機又は冷暖房切替機として構成し、第１の熱交換冷媒経路に対応する切換弁機構は、第１の熱交換冷媒経路の往き側に対応した開閉弁と、第１の屋内機の冷媒経路の往き側に対応した開閉弁とから構成することができる。
【００１３】
また上記第３の構成において、第１の屋外機の冷媒経路の両端側に第１の熱交換冷媒経路を接続し、夫々に開閉弁を設けると共に、第１の熱交換冷媒経路のバイパス経路を開閉弁よりも第１の屋外機側に設けて、このバイパス経路に開閉弁を設けると共に、第１の屋外機の冷媒経路の一方側に開閉弁を設け、この開閉弁の両端側に第１の屋内機に至る冷媒経路を接続して、この冷媒経路に開閉弁を設けた構成として切換弁機構を構成することができる。
【００１４】
さらに以上の構成において、第１と第２の熱交換冷媒経路は、並設した一対の配管により構成することができる。
【００１５】
以上の本発明によれば、空冷ヒートポンプパッケージの運転により氷蓄熱槽に蓄熱し、これをガスエンジンヒートポンプパッケージの運転時に利用して、それに接続した屋内機により空調を行うことができるので、氷蓄熱槽を備えた空冷ヒートポンプパッケージによるピークシフトと、ガスエンジンヒートポンプパッケージによるピークカット手法の両方を合理的に組み合わせて、より大きな電力のピークシフトとピークカットを図ることができる。
【００１６】
空冷ヒートポンプパッケージとガスエンジンヒートポンプパッケージを組み合わせる際、それらの屋外機は、別々に設置するので、それらを一体に構成する場合のように新たな設計が不要で、非常にローコストとすることができる。
【００１７】
空冷ヒートポンプパッケージとガスエンジンヒートポンプパッケージの冷媒が、氷蓄熱槽内の蓄熱媒体と熱交換するための熱交換冷媒経路は、第１、第２の熱交換冷媒経路として別々に構成しているため、夫々の冷媒やオイルが混合することがなく、夫々のヒートポンプ動作を最適に行うことができる。
【００１８】
また空冷ヒートポンプパッケージにも屋内機を接続して、それにより空調を行うことができ、空冷ヒートポンプパッケージの有効利用を図ることができる。
【００１９】
【発明の実施の形態】
次に本発明の実施の形態を図を参照して説明する。
まず図１〜図３は本発明の氷蓄熱・ヒートポンプ式空調システムの第１の実施の形態を示すもので、図１は全体の系統説明図であり、また図２は第１の屋外機の冷媒回路の概略図、図３は第２の屋外機の冷媒回路の概略図である。
符号１は電動機（図示省略）で駆動するコンプレッサー２ａを要素とする空調システムである空冷ヒートポンプパッケージの屋外機であり、以降、これを第１の屋外機と云う。この第１の屋外機１は、図２で示すように、前記コンプレッサー２ａと、四方弁２０と、室外熱交換器２１と、室外ファン２２、その他、図示は省略しているがアキュムレータ等の他の必要な要素を内蔵しており、冷媒経路７ｕ，７ｖを介して後述する氷蓄熱槽に接続されている。
また符号３はガスエンジン４で駆動するコンプレッサー２ｂを要素とする空調システムであるガスエンジンヒートポンプパッケージの屋外機であり、以降、これを第２の屋外機という。この第２の屋外機３は、図３で示すように、ガスエンジン４で駆動するコンプレッサー２ｂと、四方弁３０と、室外熱交換器３１と、室外ファン３２、その他の必要な要素を内蔵しており、冷媒経路８ｕ，８ｖを介して後述する氷蓄熱槽に接続されている。
また符号５は氷蓄熱槽であり、この氷蓄熱槽５には、槽内を通る熱交換冷媒経路を２経路構成している。即ち、氷蓄熱槽５内には第１、第２の熱交換冷媒経路６ａ，６ｂを構成している。これらの第１、第２の熱交換冷媒経路６ａ，６ｂは、例えば並設した一対の配管により構成する他、夫々独立していて、氷蓄熱槽５内の蓄熱媒体と熱交換可能な構成であれば適宜に構成することができる。
以上の第１、第２の屋外機１、３と氷蓄熱槽５を別々に設置する。
そして、第１の屋外機１の冷媒経路７ｕ，７ｖを氷蓄熱槽５内の第１の熱交換冷媒経路６ａに接続すると共に、第２の屋外機３の冷媒経路８ｕ，８ｖは、氷蓄熱槽５内の第２の熱交換冷媒経路６ｂと屋内機９に至る冷媒経路１０ｕ，１０ｖに直列に接続している。即ち、第２の屋外機３の冷媒経路８ｕ，８ｖは、一方側８ｕを、氷蓄熱槽５内の第２の熱交換冷媒経路６ｂを介して、屋内機９に至る冷媒経路の一方側１０ｕに接続すると共に、他方側８ｖを屋内機９に至る冷媒経路の他方側１０ｖに接続する構成としている。
また、この実施の形態では、第２の熱交換冷媒経路６ｂをバイパスするバイパス経路１１を構成し、それらを切り換える切換弁機構１２を構成している。
尚、屋内機９には、図示を省略しているが、室内熱交換器と膨張弁とが内蔵されている。
さらに、この実施の形態において、切換弁機構１２は、バイパス経路１１に設けた開閉弁１２ａと、バイパス経路１１の両端側と第２の熱交換冷媒経路６ｂの両端側との間に夫々設けた開閉弁１２ｂ，１２ｃとから構成している。切換弁機構１２は、この他、３方弁等を利用して構成することもできるものである。
【００２０】
以上の構成において、夜間においては、開閉弁１２ａ，１２ｂ，１２ｃを閉として、第１の屋外機１のみを運転する。
この運転状態では、四方弁２０は実線の状態に設定しており、第１の屋外機１のコンプレッサー２ａを要素とするヒートポンプ系統の動作により、冷媒は実線矢印（図１、図２参照）で示すように、氷蓄熱槽５の第１の熱交換冷媒経路６ａとの間に冷媒経路７ｕ，７ｖを通して冷媒が循環し、冷房期においては第１の熱交換冷媒経路６ａとの熱交換により氷蓄熱槽５内に氷を形成して蓄熱が行われる。（暖房期にこのような蓄熱運転を行うとした場合には、四方弁２０を破線の状態に設定して冷媒を破線矢印で示すように流すことにより、氷蓄熱槽５内に温水が作られて蓄熱が行われる。）
このように夜間において氷蓄熱槽５に蓄熱を行っている際に室内の空調が必要な場合には、開閉弁１２ａを開として第２の屋外機３を運転し、コンプレッサー２ｂを要素とするヒートポンプ系統を動作させると、冷媒は、実線矢印（図１、図３参照）で示すように、氷蓄熱槽５の第２の熱交換冷媒経路６ｂをバイパスして、冷媒経路８ｕからバイパス経路１１を通過して屋内機９への冷媒経路１０ｕに流すことができ、こうして屋内機９において室内の空調に供されると共に、空調に供された冷媒は、冷媒経路１０ｖ，８ｖを経て第２の屋外機３に還流する。
尚、開閉弁１２ａは、夜間の蓄熱運転において常時開とするようにする他、夜間の蓄熱運転において必要に応じて開とするようにすることができる。
【００２１】
次に空調を行う昼間において、氷蓄熱槽５内の蓄熱を利用して空調運転を行う場合には、開閉弁１２ａを閉とすると共に、開閉弁１２ｂ，１２ｃを開として、第２の屋外機３を運転する。
この運転状態では、第２の屋外機３のコンプレッサー２ｂを要素とするヒートポンプ系統の動作により、冷媒は、図１において一点鎖線矢印（図３においては実線矢印）で示すように、冷媒経路８ｕから開状態の開閉弁１２ｂを経て氷蓄熱槽５内の第２の熱交換冷媒経路６ｂに至り、この第２の熱交換冷媒経路６ｂにおいて蓄熱媒体と熱交換して過冷却された後、開状態の開閉弁１２ｃを通り、冷媒経路１０ｕから屋内機９に供給されて冷房に供される。
こうして夜間において氷蓄熱槽５に蓄熱された冷熱を、昼間における冷房に有効利用することができる。
屋内機９において冷房に供された冷媒は、次いで冷媒経路１０ｖ，８ｖを経て第２の屋外機３に還流して、循環に供される。
以上の説明は、冷房期の運転についてであるが、暖房期においても上述したとおり夜間に氷蓄熱槽５に温水の形で蓄熱した熱を、昼間に有効利用できることは勿論である。
【００２２】
尚、空調を行う昼間においても、場合によっては、開閉弁１２ｂ，１２ｃを閉とすると共に、開閉弁１２ａを開として、氷蓄熱槽５内の蓄熱を利用しない空調運転を行うことができる。
【００２３】
また以上に説明した実施の形態ではバイパス経路１１と切換弁機構１２を構成しているが、夜間の蓄熱時においてガスエンジンヒートポンプパッケージの屋外機、即ち第２の屋外機３の運転による室内の空調を行う機能が不要な場合には、上記バイパス経路１１等は不要である。
【００２４】
更に以上の実施の形態では、空冷ヒートポンプパッケージは、冷暖房運転が可能な構成として説明しているが、これは冷房専用機により構成することもできるものである。
このような構成では、暖房期においては氷蓄熱槽５に温水として蓄熱を行わず、専ら冷房期において氷蓄熱槽５に氷として蓄熱を行うものとなるが、一般的にガスエンジンヒートポンプパッケージは暖房能力が大であることから、暖房能力の低下は余り来さず、むしろ温水蓄熱によるＣＯＰの低下を来さないという利点や、システム全体の構成も簡素化されるという利点もある。
【００２５】
次に図４は本発明の氷蓄熱・ヒートポンプ式空調システムの第２の実施の形態を示す系統説明図であり、図１に示す第１の実施の形態の要素と同様な要素には同一の符号を付して重複する説明は省略する。
即ち、この実施の形態では、第１の実施の形態において、第２の屋外機３に対応して設置した屋内機９に加え、第１の屋外機１にも対応して他の屋内機４１を設置したものである。この、他の屋内機４１とは、先に第１の屋内機と記載しているものであり、そして屋内機９は、先に第２の屋内機としても記載しているものである。
この第２の実施の形態においては、第１の屋外機１の冷媒経路７ｕ，７ｖは、氷蓄熱槽５内の第１の熱交換冷媒経路６ａと、第１の屋内機４１に至る冷媒経路４２ｕ，４２ｖに並列に接続し、それらを切り換える切換弁機構４３を構成したものである。この実施の形態においては、切換弁機構４３は、第１の熱交換冷媒経路６ａの両側の夫々に対応した開閉弁４３ａ，４３ｂと、第１の屋内機４１の冷媒経路４２ｕ，４２ｖの両側の夫々に対応した開閉弁４３ｃ，４３ｄとから構成している。
【００２６】
以上の構成において、夜間は、開閉弁４３ｃ，４３ｄを閉、開閉弁４３ａ，４３ｂを開として第１の屋外機１を運転することにより、冷媒を図中実線矢印で示すように氷蓄熱槽５内の第１の熱交換冷媒経路６ａに流して氷蓄熱槽５に蓄熱を行うことができる。
また昼間は、開閉弁４３ａ，４３ｂを閉、開閉弁４３ｃ，４３ｄを開として第１の屋外機１を運転することにより、冷媒を図中破線矢印で示すように冷媒経路４２ｕ，４２ｖを経て第１の屋内機４１に流して空調を行うことができる。
従って、この第２の実施の形態では、昼間は、第２の屋外機３の運転により、氷蓄熱槽５内の蓄熱を利用した空調を第２の屋内機９を介して行えると同時に、第１の屋外機１の運転により第１の空調機４１を介して行うことができる。
【００２７】
次に図５は本発明の氷蓄熱・ヒートポンプ式空調システムの第３の実施の形態を示す系統説明図であり、図２に示す第２の実施の形態の要素と同様な要素には同一の符号を付して重複する説明は省略する。
即ち、この実施の形態では、第１の屋外機１は冷房専用機として構成し、切換弁機構４３は、第１の熱交換冷媒経路６ａの往き側に対応した開閉弁４３ａと、第１の屋内機４１の冷媒経路の往き側４２ｕに対応した開閉弁４３ｃとから構成したものである。
【００２８】
この構成では、夜間は、開閉弁４３ｃを閉、開閉弁４３ａを開として第１の屋外機１を運転することにより、冷媒を、図中実線矢印で示すように氷蓄熱槽５内の第１の熱交換冷媒経路６ａに流して氷蓄熱槽５に蓄熱を行うことができる。
また昼間は、開閉弁４３ａを閉、開閉弁４３ｃを開として第１の屋外機１を運転することにより、冷媒を、図中破線矢印で示すように冷媒経路４２ｕ，４２ｖを経て第１の屋内機４１に流して空調を行うことができる。
従って、第２の実施の形態と同様に、昼間は第２の屋外機３の運転により、氷蓄熱槽５内の蓄熱を利用した空調を第２の屋内機９を介して行えると同時に、第１の屋外機１の運転により第１の空調機４１を介して行うことができる。
【００２９】
次に図６は本発明の氷蓄熱・ヒートポンプ式空調システムの第４の実施の形態を示す系統説明図であり、図１に示す第２の実施の形態の要素と同様な要素には同一の符号を付して重複する説明は省略する。
即ち、この実施の形態では、第１の屋外機１の冷媒経路７ｕ，７ｖは、氷蓄熱槽５内の第１の熱交換冷媒経路６ａと、第１の屋内機４１に至る冷媒経路４２ｕ，４２ｖに切換弁機構により直列及び並列に接続可能な構成としており、具体的には、第１の屋外機１の冷媒経路７ｕ，７ｖの両端側に第１の熱交換冷媒経路６ａを接続し、夫々に開閉弁４４ａ，４４ｂを設けると共に、第１の熱交換冷媒経路６ａのバイパス経路４５を上記開閉弁４４ａ，４４ｂよりも第１の屋外機１側に設けて、このバイパス経路４５に開閉弁４４ｃを設けると共に、第１の屋外機１の冷媒経路の一方側７ｖに開閉弁４４ｄを設け、この開閉弁４４ｄの両端側に第１の屋内機４１に至る冷媒経路４２ｕ，４２ｖを接続して、この冷媒経路４２ｕ，４２ｖに開閉弁４４ｅ，４４ｆを設けた構成とし、これらにより切換弁機構４４を構成している。
【００３０】
この構成では、夜間は、開閉弁４４ａ，４４ｂ，４４ｄを開、開閉弁４４ｃ，４４ｅ，４４ｆを閉として第１の屋外機１を運転することにより、冷媒を、図中実線矢印で示すように氷蓄熱槽５内の第１の熱交換冷媒経路６ａに流して氷蓄熱槽５に蓄熱を行うことができる。
また昼間は、上記と逆に、開閉弁４４ａ，４４ｂ，４４ｄを閉、開閉弁４４ｃ，４４ｅ，４４ｆを開として第１の屋外機１を運転することにより、冷媒を、図中破線矢印で示すように冷媒経路４２ｕ，４２ｖを経て第１の屋内機４１に流して空調を行うことができる。
更に、この構成では、昼間において、開閉弁４４ｃ，４４ｄを閉、そして他の全ての開閉弁４４ａ，４４ｂ，４４ｅ，４４ｆを開とすることにより、第１の熱交換冷媒経路６ａと第１の屋内機４１に至る冷媒経路４２ｕ，４２ｖを直列に接続することができ、このため第１の屋外機３の運転により、氷蓄熱槽５内の蓄熱を利用した空調を第１の屋内機４１を介して行うことができる。
従って、この実施の形態では、昼間は第２の屋外機３の運転により、氷蓄熱槽５内の蓄熱を利用した空調を第２の屋内機９を介して行えると同時に、第１の屋外機１の運転により第１の空調機４１を介して行うことができ、この際、必要に応じて、氷蓄熱槽５内の蓄熱を利用した空調を第１の屋内機４１を介して行うことができる。
この運転では、第１の屋内機４１を介した空調における第１の屋外機１の消費電力低減運転が可能となる。
【００３１】
【発明の効果】
本発明は以上のとおり、氷蓄熱槽を備えた空冷ヒートポンプパッケージと、ガスエンジンにより駆動するコンプレッサーによりヒートポンプ系統を構成したガスエンジンヒートポンプパッケージを合理的に組合せたので、次のような効果がある。
ａ．夜には、安い夜間電力を利用して氷蓄熱槽に蓄熱（冷熱を含む）を行うと共に、昼には安い冷房用ガス料金を利用して電力のピークカットを行うと同時に夜に氷蓄熱槽に蓄熱した熱を有効に利用して空調能力の増大を図ることができる。
ｂ．屋外機は、空冷ヒートポンプパッケージのものと、ガスエンジンヒートポンプパッケージのものを別々に設置するので、ガスエンジンと電動機及びコンプレッサー等のヒートポンプ系統を構成する要素を屋外機として一体に構成するものとは異なり、新たな機器設計が不要で、コストが安い。
ｃ．空冷ヒートポンプパッケージとガスエンジンヒートポンプパッケージの冷媒が、氷蓄熱槽内の蓄熱媒体と熱交換するための熱交換冷媒経路は、第１、第２の熱交換冷媒経路として別々に構成しているため、夫々の冷媒やオイルが混合することがなく、夫々のヒートポンプ動作を最適に行うことができる。
ｄ．空冷ヒートポンプパッケージにも屋内機を接続して、それにより空調を行うことができ、空冷ヒートポンプパッケージの有効利用を図ることができる。
【図面の簡単な説明】
【図１】本発明の氷蓄熱・ヒートポンプ式空調システムの第１の実施の形態を示す全体の系統説明図である。
【図２】第１の屋外機の冷媒回路の概略図である。
【図３】第２の屋外機の冷媒回路の概略図である。
【図４】本発明の氷蓄熱・ヒートポンプ式空調システムの第２の実施の形態を示す全体の系統説明図である。
【図５】本発明の氷蓄熱・ヒートポンプ式空調システムの第２の実施の形態を示す全体の系統説明図である。
【図６】本発明の氷蓄熱・ヒートポンプ式空調システムの第２の実施の形態を示す全体の系統説明図である。
【符号の説明】
１第１の屋外機
２ａ，２ｂコンプレッサー
３第２の屋外機
４ガスエンジン
５氷蓄熱槽
６ａ第１の熱交換冷媒経路
６ｂ第２の熱交換冷媒経路
７ｕ，７ｖ冷媒経路
８ｕ，８ｖ冷媒経路
９屋内機（第２の屋内機）
１０ｕ，１０ｖ冷媒経路
１１バイパス経路
１２切換弁機構
１２ａ，１２ｂ，１２ｃ開閉弁
２０，３０四方弁
２１，３１室外熱交換器
２２，３２室外ファン
４１第１の屋内機
４２ｕ，４２ｖ冷媒経路
４３ａ，４３ｂ，４３ｃ，
４３ｄ開閉弁
４４ａ，４４ｂ，４４ｃ，
４４ｄ，４４ｅ，４４ｆ開閉弁
４５バイパス経路[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ice heat storage / heat pump type air conditioning system.
[0002]
[Prior art]
Electric power leveling is a social request, and it is necessary to reduce the difference in power load between day and night in order to stably supply energy and reduce energy costs.
Currently, there is a heat storage method as a method for shifting electric power to nighttime, and it has recently been provided as an air-cooled heat pump package equipped with an inexpensive ice heat storage tank.
The air-cooled heat pump package equipped with this ice heat storage tank performs ice heat storage using nighttime electric power, and uses this in the daytime to improve the cooling capacity. The ice heat storage tank literally stores heat (cold heat) in the form of ice in the cooling operation, but can store heat as hot water in the heating operation.
On the other hand, a gas engine heat pump package in which a heat pump system is configured by a compressor driven by a gas engine has recently been developed and provided as a method for peak cutting of electric power.
[0003]
The object of the present invention is to achieve a significant reduction in running cost with the aim of greater power peak shift and peak cut by combining the key points of both peak shift and peak cut methods.
[0004]
In this regard, the present inventor previously proposed a heat pump type air conditioning system that reduces running costs by switching a gas engine and an electric motor day and night to drive a compressor that constitutes a heat pump system. (See JP-A-10-78248.)
[0005]
[Problems to be solved by the invention]
However, in the system described above, since the elements constituting the heat pump system such as the gas engine, the electric motor, and the compressor are integrally configured as an outdoor unit, a new equipment design is required and the cost is increased.
Accordingly, the main object of the present invention is to solve such problems.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problem, in the present invention, first, as a first configuration, a first outdoor unit of an air-cooled heat pump package that is an air-conditioning system including an ice storage tank and a compressor driven by an electric motor, and a gas engine The second outdoor unit of the gas engine heat pump package, which is an air conditioning system having a compressor driven by the above, is separately installed, and the first and second heat exchange refrigerant paths are configured in the ice heat storage tank. The refrigerant path of the outdoor unit is connected to the first heat exchange refrigerant path in the ice heat storage tank, and the refrigerant path of the second outdoor unit is connected to the second heat exchange refrigerant path and the indoor unit in the ice heat storage tank. We propose an ice storage and heat pump air conditioning system that is connected in series to the refrigerant path to reach.
[0007]
Further, in the present invention, as a second configuration, an air conditioning system including an ice storage tank, a first outdoor unit of an air-cooled heat pump package that is an air conditioning system including a compressor driven by an electric motor, and a compressor driven by a gas engine. In addition to separately installing the second outdoor unit of the gas engine heat pump package that is the system, the first and second heat exchange refrigerant paths are configured in the ice heat storage tank corresponding to each, The refrigerant path is connected in parallel to the first heat exchange refrigerant path in the ice heat storage tank and the refrigerant path leading to the first indoor unit, and constitutes a switching valve mechanism for switching between them, and the second outdoor unit This refrigerant path proposes an ice heat storage and heat pump air conditioning system having a configuration in which the second heat exchange refrigerant path in the ice heat storage tank and the refrigerant path leading to the second indoor unit are connected in series.
[0008]
In the present invention, as a third configuration, an air heat storage tank, a first outdoor unit of an air-cooled heat pump package that is an air conditioning system including a compressor driven by an electric motor, and an air conditioner including a compressor driven by a gas engine. In addition to separately installing the second outdoor unit of the gas engine heat pump package that is the system, the first and second heat exchange refrigerant paths are configured in the ice heat storage tank corresponding to each, The refrigerant path is configured to be connected in series and in parallel by a switching valve mechanism to the first heat exchange refrigerant path in the ice heat storage tank and the refrigerant path to the first indoor unit, and the second outdoor unit The refrigerant path proposes an ice heat storage / heat pump type air conditioning system connected in series to the second heat exchange refrigerant path in the ice heat storage tank and the refrigerant path leading to the second indoor unit.
[0009]
The present invention proposes an ice heat storage / heat pump type air conditioning system in which, in the above configuration, a bypass path that bypasses the second heat exchange refrigerant path is configured, and a switching valve mechanism that switches them is configured.
[0010]
In the above configuration, the switching valve mechanism corresponding to the second heat exchange refrigerant path includes, for example, an on-off valve provided in the bypass path, and both ends of the bypass path and both ends of the second heat exchange refrigerant path. An on-off valve provided between each can be used.
[0011]
In the second configuration, the switching valve mechanism corresponding to the first heat exchange refrigerant path includes an on-off valve corresponding to each of both sides of the first heat exchange refrigerant path, and a refrigerant path of the first indoor unit. It can be configured from on-off valves corresponding to both sides.
[0012]
In the second configuration, the first outdoor unit is configured as a cooling only unit or a cooling / heating switching unit, and the switching valve mechanism corresponding to the first heat exchange refrigerant path is provided on the forward side of the first heat exchange refrigerant path. And an opening / closing valve corresponding to the forward side of the refrigerant path of the first indoor unit.
[0013]
Further, in the third configuration, the first heat exchange refrigerant path is connected to both ends of the refrigerant path of the first outdoor unit, an on-off valve is provided for each, and a bypass path of the first heat exchange refrigerant path is provided. An on-off valve is provided on the first outdoor unit side of the on-off valve, an on-off valve is provided on the bypass path, an on-off valve is provided on one side of the refrigerant path of the first outdoor unit, and the first on both ends of the on-off valve. The switching valve mechanism can be configured as a configuration in which a refrigerant path leading to the indoor unit is connected and an opening / closing valve is provided in the refrigerant path.
[0014]
Furthermore, in the above configuration, the first and second heat exchange refrigerant paths can be configured by a pair of pipes arranged side by side.
[0015]
According to the present invention as described above, heat is stored in the ice heat storage tank by the operation of the air-cooled heat pump package, and this can be used during the operation of the gas engine heat pump package and air conditioning can be performed by the indoor unit connected thereto. It is possible to rationally combine both the peak shift by the air-cooled heat pump package with the tank and the peak cut method by the gas engine heat pump package to achieve a larger power peak shift and peak cut.
[0016]
When the air-cooled heat pump package and the gas engine heat pump package are combined, the outdoor units are installed separately, so that a new design is not required as in the case where they are integrally configured, and the cost can be extremely low.
[0017]
Since the refrigerant of the air cooling heat pump package and the gas engine heat pump package exchange heat with the heat storage medium in the ice heat storage tank, the heat exchange refrigerant paths are configured separately as the first and second heat exchange refrigerant paths, Each refrigerant and oil are not mixed, and each heat pump operation can be performed optimally.
[0018]
In addition, an indoor unit can be connected to the air-cooled heat pump package, whereby air conditioning can be performed, and the air-cooled heat pump package can be effectively used.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment of an ice heat storage / heat pump type air conditioning system of the present invention. FIG. 1 is an explanatory diagram of the entire system, and FIG. 2 is a diagram of the first outdoor unit. Schematic diagram of the refrigerant circuit, FIG. 3 is a schematic diagram of the refrigerant circuit of the second outdoor unit.
Reference numeral 1 denotes an outdoor unit of an air-cooled heat pump package that is an air-conditioning system including a compressor 2a driven by an electric motor (not shown), and this is hereinafter referred to as a first outdoor unit. As shown in FIG. 2, the first outdoor unit 1 includes the compressor 2a, a four-way valve 20, an outdoor heat exchanger 21, an outdoor fan 22, and other accumulators, which are not shown. The necessary elements are built in, and are connected to an ice heat storage tank to be described later via refrigerant paths 7u and 7v.
Reference numeral 3 denotes an outdoor unit of a gas engine heat pump package, which is an air conditioning system including a compressor 2b driven by the gas engine 4, and is hereinafter referred to as a second outdoor unit. As shown in FIG. 3, the second outdoor unit 3 incorporates a compressor 2b driven by the gas engine 4, a four-way valve 30, an outdoor heat exchanger 31, an outdoor fan 32, and other necessary elements. It is connected to an ice heat storage tank, which will be described later, via refrigerant paths 8u and 8v.
Reference numeral 5 denotes an ice heat storage tank, and the ice heat storage tank 5 has two heat exchange refrigerant paths passing through the inside of the tank. That is, the ice heat storage tank 5 includes first and second heat exchange refrigerant paths 6a and 6b. These first and second heat exchange refrigerant paths 6a and 6b are configured by, for example, a pair of pipes arranged side by side, and are independent of each other and configured to be able to exchange heat with the heat storage medium in the ice heat storage tank 5. If there is, it can be configured appropriately.
The first and second outdoor units 1 and 3 and the ice heat storage tank 5 are installed separately.
The refrigerant paths 7u and 7v of the first outdoor unit 1 are connected to the first heat exchange refrigerant path 6a in the ice heat storage tank 5, and the refrigerant paths 8u and 8v of the second outdoor unit 3 are connected to the ice heat storage. The second heat exchange refrigerant path 6b in the tank 5 and the refrigerant paths 10u and 10v reaching the indoor unit 9 are connected in series. That is, the refrigerant paths 8u and 8v of the second outdoor unit 3 are arranged on one side 10u on one side 8u of the refrigerant path reaching the indoor unit 9 via the second heat exchange refrigerant path 6b in the ice heat storage tank 5. And the other side 8v is connected to the other side 10v of the refrigerant path leading to the indoor unit 9.
In this embodiment, a bypass path 11 that bypasses the second heat exchange refrigerant path 6b is configured, and a switching valve mechanism 12 that switches them is configured.
Although not shown in the figure, the indoor unit 9 includes an indoor heat exchanger and an expansion valve.
Further, in this embodiment, the switching valve mechanism 12 is provided between the on-off valve 12a provided in the bypass path 11, and both ends of the bypass path 11 and both ends of the second heat exchange refrigerant path 6b. It consists of on-off valves 12b and 12c. In addition, the switching valve mechanism 12 can also be configured using a three-way valve or the like.
[0020]
In the above configuration, at night, only the first outdoor unit 1 is operated with the on-off valves 12a, 12b, and 12c closed.
In this operating state, the four-way valve 20 is set to a solid line state, and the refrigerant is indicated by a solid line arrow (see FIGS. 1 and 2) by the operation of the heat pump system having the compressor 2a of the first outdoor unit 1 as an element. As shown, the refrigerant circulates through the refrigerant paths 7u and 7v between the ice heat storage tank 5 and the first heat exchange refrigerant path 6a, and in the cooling period, the ice is exchanged by heat exchange with the first heat exchange refrigerant path 6a. Heat is stored by forming ice in the heat storage tank 5. (When such a heat storage operation is performed during the heating period, hot water is produced in the ice heat storage tank 5 by setting the four-way valve 20 in a broken line state and flowing the refrigerant as indicated by the broken line arrow. Heat storage.)
In this way, when the indoor air conditioning is necessary when the ice heat storage tank 5 is storing heat at night, the on-off valve 12a is opened to operate the second outdoor unit 3, and the heat pump including the compressor 2b as an element. When the system is operated, the refrigerant bypasses the second heat exchange refrigerant path 6b of the ice heat storage tank 5 and bypasses the bypass path 11 from the refrigerant path 8u, as indicated by solid arrows (see FIGS. 1 and 3). The refrigerant can be passed through the refrigerant path 10u to the indoor unit 9 and thus used for indoor air conditioning in the indoor unit 9, and the refrigerant used for air conditioning passes through the refrigerant paths 10v and 8v to the second outdoor unit. Reflux to machine 3.
In addition, the on-off valve 12a can be always opened in the heat storage operation at night, and can be opened as necessary in the heat storage operation at night.
[0021]
Next, in the daytime when air conditioning is performed, when the air conditioning operation is performed using the heat stored in the ice heat storage tank 5, the on-off valve 12a is closed and the on-off valves 12b and 12c are opened to open the second outdoor unit. Drive 3
In this operation state, the refrigerant is discharged from the refrigerant path 8u as shown by a one-dot chain line arrow in FIG. 1 (solid line arrow in FIG. 3) by the operation of the heat pump system including the compressor 2b of the second outdoor unit 3 as an element. The second heat exchange refrigerant path 6b in the ice heat storage tank 5 reaches the second heat exchange refrigerant path 6b through the open / close valve 12b in the open state, and after the heat exchange with the heat storage medium is performed in the second heat exchange refrigerant path 6b, the state is opened. Is supplied to the indoor unit 9 from the refrigerant path 10u and supplied for cooling.
Thus, the cold energy stored in the ice heat storage tank 5 at night can be effectively used for cooling in the daytime.
The refrigerant provided for cooling in the indoor unit 9 is then returned to the second outdoor unit 3 through the refrigerant paths 10v and 8v and is provided for circulation.
Although the above description is about the operation in the cooling period, it is needless to say that the heat stored in the form of hot water in the ice heat storage tank 5 at night can be effectively used in the daytime as described above even in the heating period.
[0022]
In addition, even during the daytime when air conditioning is performed, in some cases, the on-off valves 12b and 12c can be closed and the on-off valve 12a can be opened to perform an air-conditioning operation without using the heat storage in the ice heat storage tank 5.
[0023]
Further, in the embodiment described above, the bypass path 11 and the switching valve mechanism 12 are configured, but the indoor air conditioning by the operation of the outdoor unit of the gas engine heat pump package, that is, the second outdoor unit 3 at the time of heat storage at night. When the function of performing the above is unnecessary, the bypass path 11 and the like are not necessary.
[0024]
Further, in the above embodiment, the air-cooled heat pump package has been described as a configuration capable of air-conditioning operation, but this can also be configured by a cooling-only machine.
In such a configuration, the ice storage tank 5 does not store heat as hot water during the heating period, and the ice storage tank 5 stores heat as ice exclusively during the cooling period. Since the capacity is large, the heating capacity does not decrease much, but there is an advantage that the COP does not decrease due to hot water heat storage, and the configuration of the entire system is simplified.
[0025]
Next, FIG. 4 is a system explanatory view showing a second embodiment of the ice heat storage and heat pump type air conditioning system of the present invention, and the same elements as the elements of the first embodiment shown in FIG. The description which attaches a code | symbol and overlaps is abbreviate | omitted.
That is, in this embodiment, in addition to the indoor unit 9 installed corresponding to the second outdoor unit 3 in the first embodiment, another indoor unit 41 corresponding to the first outdoor unit 1 is also provided. Is installed. The other indoor unit 41 is described as the first indoor unit, and the indoor unit 9 is also described as the second indoor unit.
In the second embodiment, the refrigerant paths 7u and 7v of the first outdoor unit 1 are the refrigerant path leading to the first heat exchange refrigerant path 6a in the ice heat storage tank 5 and the first indoor unit 41. The switching valve mechanism 43 is connected in parallel to 42u and 42v and switches between them. In this embodiment, the switching valve mechanism 43 includes on-off valves 43a and 43b corresponding to both sides of the first heat exchange refrigerant path 6a, and both sides of the refrigerant paths 42u and 42v of the first indoor unit 41. It comprises open / close valves 43c and 43d corresponding to each.
[0026]
In the above configuration, at night, the on-off valves 43c and 43d are closed, the on-off valves 43a and 43b are opened, and the first outdoor unit 1 is operated, whereby the refrigerant is stored in the ice heat storage tank 5 as indicated by the solid arrows in the figure. The ice can be stored in the ice heat storage tank 5 by flowing through the first heat exchange refrigerant path 6a.
In the daytime, the first outdoor unit 1 is operated with the on-off valves 43a and 43b closed and the on-off valves 43c and 43d open, so that the refrigerant passes through the refrigerant paths 42u and 42v as shown by broken line arrows in the figure. The air conditioning can be performed by flowing through one indoor unit 41.
Therefore, in the second embodiment, during the daytime, the second outdoor unit 3 can be operated to perform air conditioning using the heat storage in the ice heat storage tank 5 via the second indoor unit 9 while the second outdoor unit 3 is operated. The first outdoor unit 1 can be operated through the first air conditioner 41.
[0027]
Next, FIG. 5 is a system explanatory view showing a third embodiment of the ice heat storage and heat pump type air conditioning system of the present invention, and the same elements as those of the second embodiment shown in FIG. The description which attaches a code | symbol and overlaps is abbreviate | omitted.
That is, in this embodiment, the first outdoor unit 1 is configured as a dedicated cooling unit, and the switching valve mechanism 43 includes an on-off valve 43a corresponding to the forward side of the first heat exchange refrigerant path 6a, and the first The on / off valve 43c corresponding to the forward side 42u of the refrigerant path of the indoor unit 41 is configured.
[0028]
In this configuration, at night, the first outdoor unit 1 is operated by closing the on-off valve 43c and opening the on-off valve 43a, so that the refrigerant is stored in the first ice storage tank 5 as indicated by the solid arrow in the figure. The heat can be stored in the ice heat storage tank 5 by flowing through the heat exchange refrigerant path 6a.
Also, during the daytime, the first outdoor unit 1 is operated with the on-off valve 43a closed and the on-off valve 43c open, so that the refrigerant passes through the refrigerant paths 42u and 42v as shown by the broken line arrows in the figure. The air conditioning can be performed by flowing in the machine 41.
Therefore, as in the second embodiment, during the daytime, the second outdoor unit 3 can be operated to perform air conditioning using the heat storage in the ice heat storage tank 5 via the second indoor unit 9, and at the same time, The first outdoor unit 1 can be operated through the first air conditioner 41.
[0029]
Next, FIG. 6 is a system explanatory view showing a fourth embodiment of the ice heat storage and heat pump type air conditioning system of the present invention. The same elements as those of the second embodiment shown in FIG. The description which attaches a code | symbol and overlaps is abbreviate | omitted.
That is, in this embodiment, the refrigerant paths 7u and 7v of the first outdoor unit 1 are the refrigerant paths 42u and 7u that reach the first heat exchange refrigerant path 6a in the ice heat storage tank 5 and the first indoor unit 41, respectively. 42v is configured to be connected in series and in parallel by a switching valve mechanism, specifically, the first heat exchange refrigerant path 6a is connected to both ends of the refrigerant paths 7u, 7v of the first outdoor unit 1, On-off valves 44a and 44b are provided respectively, and a bypass path 45 of the first heat exchange refrigerant path 6a is provided closer to the first outdoor unit 1 than the on-off valves 44a and 44b. 44c, an opening / closing valve 44d is provided on one side 7v of the refrigerant path of the first outdoor unit 1, and refrigerant paths 42u and 42v reaching the first indoor unit 41 are connected to both ends of the opening / closing valve 44d. The on-off valve 4 is connected to the refrigerant paths 42u and 42v. e, a structure provided with 44f, constitute a switching valve mechanism 44 thereby.
[0030]
In this configuration, at night, the on-off valves 44a, 44b, 44d are opened, the on-off valves 44c, 44e, 44f are closed, and the first outdoor unit 1 is operated, so that the refrigerant is indicated by solid arrows in the figure. The ice can be stored in the ice storage tank 5 by flowing through the first heat exchange refrigerant path 6 a in the ice storage tank 5.
Also, during the daytime, contrary to the above, by operating the first outdoor unit 1 with the on-off valves 44a, 44b, 44d closed and the on-off valves 44c, 44e, 44f opened, the refrigerant is indicated by broken line arrows in the figure. As described above, the air conditioning can be performed by flowing the refrigerant path 42u, 42v to the first indoor unit 41.
Further, in this configuration, in the daytime, the on-off valves 44c, 44d are closed and all the other on-off valves 44a, 44b, 44e, 44f are opened, so that the first heat exchange refrigerant path 6a and the first The refrigerant paths 42u and 42v leading to the indoor unit 41 can be connected in series. Therefore, by operating the first outdoor unit 3, the first indoor unit 41 is air-conditioned using the heat storage in the ice heat storage tank 5. Can be done through.
Therefore, in this embodiment, the air conditioner using the heat storage in the ice heat storage tank 5 can be performed via the second indoor unit 9 by the operation of the second outdoor unit 3 during the daytime, and at the same time the first outdoor unit. 1 operation can be performed via the first air conditioner 41. At this time, air conditioning using the heat storage in the ice heat storage tank 5 can be performed via the first indoor unit 41 as necessary. it can.
In this operation, the power consumption reduction operation of the first outdoor unit 1 in the air conditioning via the first indoor unit 41 becomes possible.
[0031]
【The invention's effect】
As described above, the present invention has the following effects because the air-cooled heat pump package having the ice heat storage tank and the gas engine heat pump package in which the heat pump system is configured by the compressor driven by the gas engine are rationally combined.
a. In the evening, heat is stored in the ice storage tank (including cold energy) using cheap nighttime electricity, and at the same time the peak of electricity is cut using cheap gas charges for cooling, and at the same time the ice storage tank is used at night. The air conditioning capacity can be increased by effectively using the heat stored in the air.
b. Since the outdoor unit is installed separately from the air-cooled heat pump package and the gas engine heat pump package, it is different from the unit that constitutes the heat pump system such as the gas engine, the electric motor, and the compressor as a single unit. New equipment design is unnecessary and cost is low.
c. Since the refrigerant of the air cooling heat pump package and the gas engine heat pump package exchange heat with the heat storage medium in the ice heat storage tank, the heat exchange refrigerant path is configured separately as the first and second heat exchange refrigerant paths, Each refrigerant and oil are not mixed, and each heat pump operation can be performed optimally.
d. An indoor unit can also be connected to the air-cooled heat pump package, whereby air conditioning can be performed, and the air-cooled heat pump package can be used effectively.
[Brief description of the drawings]
FIG. 1 is an overall system explanatory view showing a first embodiment of an ice heat storage / heat pump type air conditioning system of the present invention.
FIG. 2 is a schematic diagram of a refrigerant circuit of a first outdoor unit.
FIG. 3 is a schematic diagram of a refrigerant circuit of a second outdoor unit.
FIG. 4 is an entire system explanatory view showing a second embodiment of the ice heat storage / heat pump type air conditioning system of the present invention.
FIG. 5 is an entire system explanatory view showing a second embodiment of the ice heat storage / heat pump type air conditioning system of the present invention.
FIG. 6 is an entire system explanatory view showing a second embodiment of the ice heat storage / heat pump type air conditioning system of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st outdoor unit 2a, 2b Compressor 3 2nd outdoor unit 4 Gas engine 5 Ice heat storage tank 6a 1st heat exchange refrigerant path 6b 2nd heat exchange refrigerant path 7u, 7v Refrigerant path 8u, 8v Refrigerant path 9 Indoor unit (second indoor unit)
10u, 10v Refrigerant path 11 Bypass path 12 Switching valve mechanism 12a, 12b, 12c On-off valve 20, 30 Four-way valve 21, 31 Outdoor heat exchanger 22, 32 Outdoor fan 41 First indoor unit 42u, 42v Refrigerant path 43a, 43b 43c,
43d on-off valves 44a, 44b, 44c,
44d, 44e, 44f On-off valve 45 Bypass path

Claims

A first outdoor unit of an air-cooled heat pump package that is an air-conditioning system including an ice storage tank and a compressor driven by an electric motor, and a second gas-engine heat pump package that is an air-conditioning system including a compressor driven by a gas engine. The outdoor unit is separately installed, the first and second heat exchange refrigerant paths are formed in the ice heat storage tank, and the refrigerant path of the first outdoor unit is used as the first heat exchange refrigerant path in the ice heat storage tank. And the refrigerant path of the second outdoor unit is connected in series with the second heat exchange refrigerant path in the ice heat storage tank and the refrigerant path to the indoor unit. system

A first outdoor unit of an air-cooled heat pump package that is an air-conditioning system including an ice storage tank and a compressor driven by an electric motor, and a second gas-engine heat pump package that is an air-conditioning system including a compressor driven by a gas engine. The outdoor units are separately installed, and the first and second heat exchange refrigerant paths are configured in the ice heat storage tank corresponding to each of the outdoor units, and the refrigerant path of the first outdoor unit is the first in the ice heat storage tank. The heat exchange refrigerant path of 1 and the refrigerant path leading to the first indoor unit are connected in parallel to form a switching valve mechanism for switching between them, and the refrigerant path of the second outdoor unit is provided in the ice heat storage tank. An ice heat storage / heat pump type air conditioning system characterized by being connected in series to a second heat exchange refrigerant path and a refrigerant path leading to a second indoor unit

A first outdoor unit of an air-cooled heat pump package that is an air-conditioning system including an ice storage tank and a compressor driven by an electric motor, and a second gas-engine heat pump package that is an air-conditioning system including a compressor driven by a gas engine. The outdoor units are separately installed, and the first and second heat exchange refrigerant paths are configured in the ice heat storage tank corresponding to each of the outdoor units, and the refrigerant path of the first outdoor unit is the first in the ice heat storage tank. The refrigerant path of the second outdoor unit is connected to the first heat exchange refrigerant path and the refrigerant path leading to the first indoor unit in series and in parallel by the switching valve mechanism. An ice heat storage / heat pump type air conditioning system characterized in that it is connected in series to the heat exchange refrigerant path of No. 2 and the refrigerant path to the second indoor unit.

The ice heat storage / heat pump type air conditioning system according to claim 1, 2, or 3, wherein a bypass path that bypasses the second heat exchange refrigerant path is configured, and a switching valve mechanism that switches the bypass path is configured.

The switching valve mechanism corresponding to the second heat exchange refrigerant path includes an open / close valve provided in the bypass path, and an open / close valve provided between both ends of the bypass path and both ends of the second heat exchange refrigerant path, The ice heat storage / heat pump type air conditioning system according to claim 4, wherein

The switching valve mechanism corresponding to the first heat exchange refrigerant path includes on / off valves corresponding to both sides of the first heat exchange refrigerant path and on / off valves corresponding to both sides of the refrigerant path of the first indoor unit. The ice heat storage / heat pump type air conditioning system according to claim 2,

The first outdoor unit is configured as a cooling only unit or a cooling / heating switching unit, and the switching valve mechanism corresponding to the first heat exchange refrigerant path includes an on-off valve corresponding to the forward side of the first heat exchange refrigerant path, The ice heat storage / heat pump type air conditioning system according to claim 2, comprising an on-off valve corresponding to the forward side of the refrigerant path of the indoor unit.

The first heat exchange refrigerant path is connected to both ends of the refrigerant path of the first outdoor unit, and an opening / closing valve is provided for each, and the bypass path of the first heat exchange refrigerant path is the first outdoor than the opening / closing valve. An on-off valve is provided on the bypass side, an on-off valve is provided on one side of the refrigerant path of the first outdoor unit, and a refrigerant path to the first indoor unit is provided on both ends of the on-off valve. The ice storage / heat pump type air conditioning system according to claim 3, wherein a switching valve mechanism is configured as a configuration in which an on-off valve is provided in the refrigerant path.

The ice heat storage / heat pump type air conditioning system according to any one of claims 1 to 8, wherein the first and second heat exchange refrigerant paths are configured by a pair of pipes arranged side by side.