JP3867114B2

JP3867114B2 - Outer fusion heat storage tank and heat storage air conditioner using the same

Info

Publication number: JP3867114B2
Application number: JP15201799A
Authority: JP
Inventors: 晃三島; 健二高木; 正教上倉; 賢金子; 信太田原; 貢青山
Original assignee: Hitachi Ltd
Current assignee: Hitachi Ltd
Priority date: 1999-05-31
Filing date: 1999-05-31
Publication date: 2007-01-10
Anticipated expiration: 2019-05-31
Also published as: JP2000346401A

Description

【０００１】
【発明の属する技術分野】
本発明は、外融式蓄熱槽およびそれを用いた蓄熱式空気調和機に係り、特に、冬季の暖房運転時における立ち上げ時間の短時間化に好適な外融式蓄熱槽およびそれを用いた蓄熱式空気調和機に関するものである。
【０００２】
【従来の技術】
電力料金の安い夜間に電気エネルギーを熱エネルギーに変換して蓄熱し、蓄熱されたエネルギーを昼間に利用する蓄熱装置や、この蓄熱装置を利用した蓄熱式空気調和機が採用されている。
【０００３】
前記蓄熱装置は、たとえば、特開平７−１７４３６９号公報に開示されているように、低温のブラインが供給される伝熱管が氷蓄熱水槽内に多層状に配設され、氷蓄熱槽の下部に、水槽内の伝熱管の周囲に生成した氷と熱交換した冷水を空調機側に送り出す冷水配管が接続され、氷蓄熱水槽の上部に空気調和機からの戻り水を水槽内に送り込む戻り水送り管が接続されたスタティック型の氷蓄熱装置において、氷蓄熱槽内の上記戻り水送り管の先端部に、戻り水を噴出する複数の分流穴が穿設された分流管を接続し、この分流管に接続され、上記分流穴からの噴流によって水槽内に引き起こされた渦流の停滞区域に延設した構成としている。
【０００４】
そして、伝熱管の周囲に生成した氷を均一に溶かし、安定した温度の冷水を空気調和機側に供給することができるようにしている。
【０００５】
このような氷蓄熱装置を用いた空気調和機においては、夏季には、夜間に氷蓄熱槽内の水を凍らせて冷熱を蓄え、蓄えられた冷熱を昼間の冷房に使用し、冬季には、氷蓄熱槽内の水を加熱して温熱を蓄え、蓄えられた温熱を昼間の暖房に利用している。
【０００６】
【発明が解決しようとする課題】
たとえば、上記のような氷蓄熱装置を利用して冬季に暖房を行う場合、暖房開始時には空気調和機の室内ユニット内が室内の空気と同じ温度まで冷えているため、室内ユニットの起動時に冷風が吹き出し室内の空気を攪拌するため、暖房運転を開始したにもかかわらず、さらに室内が冷え込む感じを与え不快感を与えることがある。
【０００７】
上記の事情に鑑み、本発明の目的は、暖房運転開始時の冷風の吹き出しをなくし、快適な運転ができるようにした外融式蓄熱槽およびそれを用いた蓄熱式空気調和機を提供することにある。
【０００８】
【課題を解決するための手段】
上記の目的を達成するため、本発明の外融式蓄熱槽は、熱源機と、熱源機に接続された水ーブライン熱交換器と、蓄熱媒体としての水を蓄える蓄熱槽と、前記熱源機に接続され、かつ、蓄熱槽内に配置された蓄熱熱交換器と、前記熱源機と水ーブライン熱交換器の間、および熱源機と蓄熱熱交換器の間でブラインを循環させるブラインポンプと、それぞれ電動二方向弁を介して前記蓄熱槽に接続された複数の負荷設備と、前記蓄熱槽内の水を前記蓄熱槽と負荷設備の間で循環させる水ポンプと、前記蓄熱槽内の水を循環させる循環ポンプとを設け、前記循環ポンプの吐出側の配管を分岐し、分岐された一方を前記水ポンプと前記電動二方向弁との間に接続した。
【０００９】
また、本発明の蓄熱式空気調和機は、熱源機と、熱源機に接続された水ーブライン熱交換器と、水を蓄える蓄熱槽と、前記熱源機に接続され、かつ、蓄熱槽内に配置された蓄熱熱交換器と、前記熱源機と水ーブライン熱交換器の間、および熱源機と蓄熱熱交換器の間でブラインを循環させるブラインポンプと、それぞれ電動二方向弁を介して前記蓄熱槽に接続された複数の空気調和機の室内ユニットと、前記蓄熱槽内の水を前記蓄熱槽と各室内ユニットの間で循環させる水ポンプと、前記蓄熱槽内の水を循環させる循環ポンプとを設け、前記循環ポンプの吐出側の配管を分岐し、分岐された一方を前記水ポンプと前記電動二方向弁との間に接続した。
【００１０】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。
図１ないし図４は、本発明の実施の形態を示すもので、図１は、本発明による外融式蓄熱槽を用いた蓄熱式空気調和機の配管系統図、図２は、図１に示す蓄熱式空気調和機における蓄熱時のブラインの流れを示す配管系統図、図３は、図１に示す蓄熱式空気調和機における冷暖房運転時のブラインおよび水の流れを示す配管系統図、図４は、図１に示す蓄熱式空気調和機における暖房運転開始時のブラインおよび水の流れを示す配管系統図である。
【００１１】
同図において、１は熱源機。２は電動二方向弁で、熱源機１に接続されている。３は水ーブライン熱交換器で、電磁二方向弁２に接続されている。４は電磁二方向弁で、前記熱源機１に前記電磁二方向弁２と並列に接続されている。５は蓄熱槽で、内部に水を蓄えている。６は蓄熱熱交換器で、前記蓄熱槽５内に配置され、前記電磁二方向弁４に接続されている。７はブラインポンプで、前記水ーブライン熱交換器３と蓄熱熱交換器６からの戻り配管の合流点と熱源機１の間に接続されている。
【００１２】
８は電磁三方混合弁で、前記蓄熱槽５に接続されている。９は水ポンプで、前記電磁三方混合弁８に接続されている。１０、１１は電磁二方向弁。１２、１３は室内ユニットで、それぞれ電磁二方向弁１０、１１と直列に接続されている。前記電磁二方向弁１０、１１と室内ユニット１２、１３は、前記水ポンプ９と水ーブライン熱交換器３の間に並列に接続されている。１４は電磁二方向弁で、前記水ーブライン熱交換器３と電磁三方混合弁８の間に接続されている。１５はヘッダで、前記蓄熱槽５内に水中に位置するように配置され、前記水ーブライン熱交換器３と電磁二方向弁１４の間に接続されている。
【００１３】
１６は循環ポンプで、前記蓄熱槽５に接続されている。１７は電磁二方向弁で、前記循環ポンプ１６の吐出側で分岐された配管の一方に接続されている。１８はヘッダで、前記蓄熱槽５内に配置され、前記電磁二方向弁１７に接続されている。１９は電磁二方向弁で、前記循環ポンプ１６の吐出側で分岐された配管の他方と前記水ポンプ９の吐出側の配管の間に接続されている。
【００１４】
このような構成で、蓄熱時には、電磁二方向弁２、１９を閉め、電磁二方向弁４、１７を開いた状態で、熱源機１、ブラインポンプ７および循環ポンプ１６を作動させる。
【００１５】
すると、図２に実線で示すように、熱源機１から吐出されたブラインは、電磁二方向弁４、蓄熱熱交換器６を通り、蓄熱槽５内の水と熱交換された後ブラインポンプ７により熱源機１に戻される。このとき、熱源機１から吐出されるブラインが冷熱であれば、蓄熱槽５内の水を凍らせることができる。また、熱源機１から吐出されるブラインが温熱であれば、蓄熱槽５内の水を加熱することができる。
【００１６】
一方、蓄熱槽５内の水は、蓄熱槽５の底部から循環ポンプ１６により汲み出され、電磁二方向弁１７を通して蓄熱槽５の上部の水中に配置されたヘッダ１８から蓄熱槽５内に吐出される。このようにして、蓄熱槽５内の水を循環させることにより、蓄熱槽５内の水の温度分布を均一にすることができる。
【００１７】
冷暖房運転時には、電磁二方向弁４、１９を閉め、電磁二方向弁２、１０、１１、１４、１７、電磁三方混合弁８を開き、熱源機１、ブラインポンプ７、水ポンプ９および循環ポンプ１６を作動させる。
【００１８】
すると、図３に実線で示すように、熱源機１から吐出されたブラインは、水ーブライン熱交換器３を通りブラインポンプ７により熱源機１に戻される。また、循環ポンプ１６により汲み出された水はヘッダ１８から蓄熱槽５に戻される。
【００１９】
電磁二方向弁８を通して水ポンプ９で汲み出された水は、電磁二方向弁１０、１１を通して室内ユニット１２、１３に供給される。この室内ユニット１２、１３で室内空気と熱交換され室内の冷暖房を行う。熱交換された水は、水ーブライン熱交換器３に流入して、熱源機１から水ーブライン熱交換器３に送り込まれたブラインとの間で熱交換され再び冷水もしくは温水となる。
【００２０】
水ーブライン熱交換器３で熱交換された水の一部は、電磁三方混合弁８を通して蓄熱槽５から汲み出された水と混合され再び室内ユニット１２、１３に送られる。また、水ーブライン熱交換器３で熱交換された水の他の一部は、蓄熱槽５内に送り込まれ、ヘッダ１５から蓄熱槽５内の水中に噴出される。
【００２１】
前記のようにして、蓄熱および冷暖房運転が行われるが、特に、暖房運転の開始時には、たとえば、電磁二方向弁２、１１、１４、１７と電磁三方混合弁８を閉め、電磁二方向弁４、１０、１９を開き、熱源機１、ブラインポンプ７および循環ポンプ１６を作動させる。
【００２２】
すると、図４に実線で示すように、熱源機１から吐出されたブラインは、電磁二方向弁４、蓄熱熱交換器６を通り、蓄熱槽５内の水と熱交換された後ブラインポンプ７により熱源機１に戻される。また、循環ポンプ１６により汲み出された水は、電磁二方向弁１９、１０を通り室内ユニット１２に流入して、室内ユニット１２内を暖める。
【００２３】
循環ポンプ１６が作動を開始してから一定時間経過した後、各電磁二方向弁２、４、１０、１１、１４、１７、１９、電磁三方混合弁８を図３の状態に切り替えて、室内ユニット１２の運転を開始する。
【００２４】
一方、室内ユニット１２を温めた水は、水ーブライン熱交換器３に流入して、熱源機１から水ーブライン熱交換器３に送り込まれたブラインとの間で熱交換され再び温水となる。
【００２５】
そして、水ーブライン熱交換器３で熱交換された水の一部は、電磁三方混合弁８を通して蓄熱槽５から汲み出された水と混合され再び室内ユニット１２、１３に送られる。また、水ーブライン熱交換器３で熱交換された水の他の一部は、蓄熱槽５内に送り込まれ、ヘッダ１５から蓄熱槽５内の水中に噴出される。
【００２６】
このように、暖房運転開始時に循環ポンプ１６から吐出された温水を室内ユニット１２に送り、室内ユニット１２内を暖めた後、室内ユニット１２を作動させることにより、暖房開始時に室内ユニット１２から冷風が吹き出されるのを防止して快適な暖房運転を行うことができる。
【００２７】
特に、タイマー設定などにより自動的に運転を開始する場合、室内ユニットの運転開始より所定の時間だけ早く予熱運転を開始することにより、より快適な暖房環境を得ることができる。
【００２８】
【発明の効果】
以上述べたごとく、本願発明によれば、予熱が必要な負荷、たとえば、空気調和機の室内ユニットの暖房運転開始時に、冷風の吹き出しを防止して、快適な暖房運転を行うことができる。
【図面の簡単な説明】
【図１】本発明による外融式蓄熱槽を用いた蓄熱式空気調和機の配管系統図。
【図２】図１に示す蓄熱式空気調和機における蓄熱時のブラインの流れを示す配管系統図。
【図３】図１に示す蓄熱式空気調和機における冷暖房運転時のブラインおよび水の流れを示す配管系統図。
【図４】図１に示す蓄熱式空気調和機における暖房運転開始時のブラインおよび水の流れを示す配管系統図。
【符号の説明】
１…熱源機、３…水ーブライン熱交換器、５…蓄熱槽、６…蓄熱熱交換器、７…ブラインポンプ、２、４、１０、１１、１４、１７、１９…電動二方向弁、１２、１３…室内ユニット、９…水ポンプ、１６…循環ポンプ。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an outer fusion heat storage tank and a heat storage air conditioner using the same, and more particularly to an outer fusion heat storage tank suitable for shortening the start-up time during heating operation in winter and the same. The present invention relates to a heat storage type air conditioner.
[0002]
[Prior art]
A heat storage device that converts electric energy into heat energy to store heat at night when the power rate is cheap and uses the stored energy in the daytime, and a heat storage air conditioner that uses this heat storage device are adopted.
[0003]
In the heat storage device, for example, as disclosed in JP-A-7-174369, heat transfer tubes to which low-temperature brine is supplied are arranged in a multilayer shape in an ice heat storage water tank, and in the lower part of the ice heat storage tank. A chilled water pipe that sends chilled water exchanged with ice generated around the heat transfer pipe in the water tank to the air conditioner is connected to the upper part of the ice heat storage water tank, and the return water feed that sends the return water from the air conditioner into the water tank In a static ice storage device connected to a pipe, a branch pipe having a plurality of branch holes for ejecting return water is connected to the tip of the return water feed pipe in the ice storage tank. It is connected to a pipe, and is configured to extend to a stagnant area of vortex induced in the water tank by the jet from the diversion hole.
[0004]
And the ice produced | generated around the heat exchanger tube is melt | dissolved uniformly, and it enables it to supply the cold water of the stable temperature to the air conditioner side.
[0005]
In an air conditioner using such an ice heat storage device, in summer, the water in the ice heat storage tank is frozen at night to store cold energy, and the stored cold energy is used for daytime cooling. The water in the ice heat storage tank is heated to store heat, and the stored heat is used for daytime heating.
[0006]
[Problems to be solved by the invention]
For example, when heating in winter using the ice heat storage device as described above, the indoor unit of the air conditioner is cooled to the same temperature as the indoor air at the start of heating. Since the air in the blowout room is agitated, the room may be further cooled and uncomfortable even though the heating operation is started.
[0007]
In view of the above circumstances, an object of the present invention is to provide an outer-melting type heat storage tank that eliminates the blowing of cold air at the start of heating operation and that can be operated comfortably, and a heat storage type air conditioner using the same. It is in.
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, an external fusion heat storage tank of the present invention includes a heat source unit, a water-brine heat exchanger connected to the heat source unit, a heat storage tank for storing water as a heat storage medium, and the heat source unit. A heat storage heat exchanger connected and disposed in the heat storage tank, a brine pump for circulating brine between the heat source unit and the water-brine heat exchanger, and between the heat source unit and the heat storage heat exchanger, respectively. A plurality of load equipment connected to the heat storage tank via an electric two-way valve, a water pump for circulating water in the heat storage tank between the heat storage tank and the load equipment, and circulating water in the heat storage tank and a circulation pump for providing branches a discharge side pipe of the circulation pump to connect one which is branched between the front Kisui pump the electric two-way valve.
[0009]
The heat storage air conditioner of the present invention is a heat source unit, a water-brine heat exchanger connected to the heat source unit, a heat storage tank for storing water, connected to the heat source unit, and disposed in the heat storage tank. Heat storage heat exchanger, a brine pump for circulating brine between the heat source device and the water-brine heat exchanger, and between the heat source device and the heat storage heat exchanger, and the heat storage tank via an electric two-way valve, respectively. A plurality of air conditioner indoor units connected to each other, a water pump for circulating water in the heat storage tank between the heat storage tank and each indoor unit, and a circulation pump for circulating water in the heat storage tank provided, branched piping on the discharge side of the circulation pump to connect one which is branched between the front Kisui pump and the electric two-way valve.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show an embodiment of the present invention. FIG. 1 is a piping system diagram of a regenerative air conditioner using an external fusion heat storage tank according to the present invention, and FIG. FIG. 3 is a piping system diagram showing a flow of brine during heat storage in the regenerative air conditioner shown, and FIG. 3 is a piping system diagram showing a flow of brine and water during the cooling / heating operation in the heat storage air conditioner shown in FIG. These are the piping system diagrams which show the flow of the brine and water at the time of the heating operation start in the thermal storage type air conditioner shown in FIG.
[0011]
In the figure, 1 is a heat source machine. An electric two-way valve 2 is connected to the heat source unit 1. A water-brine heat exchanger 3 is connected to the electromagnetic two-way valve 2. An electromagnetic two-way valve 4 is connected to the heat source device 1 in parallel with the electromagnetic two-way valve 2. 5 is a heat storage tank which stores water therein. A heat storage heat exchanger 6 is disposed in the heat storage tank 5 and connected to the electromagnetic two-way valve 4. A brine pump 7 is connected between the junction of the return pipes from the water-brine heat exchanger 3 and the heat storage heat exchanger 6 and the heat source unit 1.
[0012]
An electromagnetic three-way mixing valve 8 is connected to the heat storage tank 5. A water pump 9 is connected to the electromagnetic three-way mixing valve 8. 10 and 11 are electromagnetic two-way valves. Reference numerals 12 and 13 denote indoor units, which are connected in series with the electromagnetic two-way valves 10 and 11, respectively. The electromagnetic two-way valves 10 and 11 and the indoor units 12 and 13 are connected in parallel between the water pump 9 and the water-brine heat exchanger 3. An electromagnetic two-way valve 14 is connected between the water-brine heat exchanger 3 and the electromagnetic three-way mixing valve 8. A header 15 is disposed in the heat storage tank 5 so as to be located in water, and is connected between the water-brine heat exchanger 3 and the electromagnetic two-way valve 14.
[0013]
A circulation pump 16 is connected to the heat storage tank 5. An electromagnetic two-way valve 17 is connected to one of the pipes branched on the discharge side of the circulation pump 16. Reference numeral 18 denotes a header which is disposed in the heat storage tank 5 and is connected to the electromagnetic two-way valve 17. An electromagnetic two-way valve 19 is connected between the other pipe branched on the discharge side of the circulation pump 16 and the discharge side pipe of the water pump 9.
[0014]
With this configuration, at the time of heat storage, the heat source unit 1, the brine pump 7 and the circulation pump 16 are operated with the electromagnetic two-way valves 2 and 19 closed and the electromagnetic two-way valves 4 and 17 opened.
[0015]
Then, as shown by a solid line in FIG. 2, the brine discharged from the heat source unit 1 passes through the electromagnetic two-way valve 4 and the heat storage heat exchanger 6, and is then heat-exchanged with water in the heat storage tank 5, and then the brine pump 7. Is returned to the heat source unit 1. At this time, if the brine discharged from the heat source device 1 is cold, the water in the heat storage tank 5 can be frozen. Moreover, if the brine discharged from the heat source device 1 is warm, the water in the heat storage tank 5 can be heated.
[0016]
On the other hand, the water in the heat storage tank 5 is pumped from the bottom of the heat storage tank 5 by the circulation pump 16 and discharged into the heat storage tank 5 from the header 18 disposed in the water in the upper part of the heat storage tank 5 through the electromagnetic two-way valve 17. Is done. In this way, the temperature distribution of the water in the heat storage tank 5 can be made uniform by circulating the water in the heat storage tank 5.
[0017]
During the cooling / heating operation, the electromagnetic two-way valves 4 and 19 are closed, the electromagnetic two-way valves 2, 10, 11, 14, 17 and the electromagnetic three-way mixing valve 8 are opened, the heat source unit 1, the brine pump 7, the water pump 9 and the circulation pump. 16 is activated.
[0018]
Then, as shown by a solid line in FIG. 3, the brine discharged from the heat source device 1 passes through the water-brine heat exchanger 3 and is returned to the heat source device 1 by the brine pump 7. Further, the water pumped out by the circulation pump 16 is returned from the header 18 to the heat storage tank 5.
[0019]
Water pumped by the water pump 9 through the electromagnetic two-way valve 8 is supplied to the indoor units 12 and 13 through the electromagnetic two-way valves 10 and 11. The indoor units 12 and 13 exchange heat with room air to cool and heat the room. The heat-exchanged water flows into the water-brine heat exchanger 3 and exchanges heat with the brine sent from the heat source unit 1 to the water-brine heat exchanger 3 to become cold water or hot water again.
[0020]
A part of the water heat-exchanged in the water-brine heat exchanger 3 is mixed with the water pumped out from the heat storage tank 5 through the electromagnetic three-way mixing valve 8 and sent again to the indoor units 12 and 13. In addition, another part of the water heat-exchanged in the water-brine heat exchanger 3 is sent into the heat storage tank 5 and ejected from the header 15 into the water in the heat storage tank 5.
[0021]
As described above, heat storage and cooling / heating operations are performed. In particular, at the start of heating operation, for example, the electromagnetic two-way valves 2, 11, 14, 17 and the electromagnetic three-way mixing valve 8 are closed, and the electromagnetic two-way valve 4 is closed. 10 and 19 are opened, and the heat source unit 1, the brine pump 7 and the circulation pump 16 are operated.
[0022]
Then, as shown by a solid line in FIG. 4, the brine discharged from the heat source device 1 passes through the electromagnetic two-way valve 4 and the heat storage heat exchanger 6, and after being heat-exchanged with water in the heat storage tank 5, the brine pump 7 Is returned to the heat source unit 1. In addition, the water pumped out by the circulation pump 16 flows into the indoor unit 12 through the electromagnetic two-way valves 19 and 10 and warms the interior of the indoor unit 12.
[0023]
After a certain time has elapsed since the circulation pump 16 started operating, the electromagnetic two-way valves 2, 4, 10, 11, 14, 17, 19, and the electromagnetic three-way mixing valve 8 are switched to the state shown in FIG. The operation of the unit 12 is started.
[0024]
On the other hand, the water that warms the indoor unit 12 flows into the water-brine heat exchanger 3 and is heat-exchanged with the brine sent from the heat source unit 1 to the water-brine heat exchanger 3 to become hot water again.
[0025]
A part of the water heat-exchanged in the water-brine heat exchanger 3 is mixed with the water pumped out of the heat storage tank 5 through the electromagnetic three-way mixing valve 8 and sent to the indoor units 12 and 13 again. The other part of the water heat-exchanged in the water-brine heat exchanger 3 is sent into the heat storage tank 5 and ejected from the header 15 into the water in the heat storage tank 5.
[0026]
As described above, the warm water discharged from the circulation pump 16 at the start of the heating operation is sent to the indoor unit 12 and the interior of the indoor unit 12 is warmed. It is possible to prevent the air from being blown out and perform a comfortable heating operation.
[0027]
In particular, when the operation is automatically started by setting a timer or the like, a more comfortable heating environment can be obtained by starting the preheating operation a predetermined time earlier than the operation start of the indoor unit.
[0028]
【The invention's effect】
As described above, according to the present invention, it is possible to perform a comfortable heating operation by preventing the blowing of cold air at the start of a heating operation of a load that requires preheating, for example, an indoor unit of an air conditioner.
[Brief description of the drawings]
FIG. 1 is a piping system diagram of a regenerative air conditioner using an external fusion heat storage tank according to the present invention.
FIG. 2 is a piping diagram showing the flow of brine during heat storage in the heat storage type air conditioner shown in FIG.
FIG. 3 is a piping diagram showing the flow of brine and water during the cooling / heating operation in the regenerative air conditioner shown in FIG. 1;
4 is a piping system diagram showing the flow of brine and water at the start of heating operation in the regenerative air conditioner shown in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Heat source machine, 3 ... Water-brine heat exchanger, 5 ... Heat storage tank, 6 ... Heat storage heat exchanger, 7 ... Brine pump 2, 4, 10, 11, 14, 17, 19 ... Electric two-way valve, 12 , 13: indoor unit, 9: water pump, 16 ... circulation pump.

Claims

A heat source unit, a water-brine heat exchanger connected to the heat source unit, a heat storage tank for storing water as a heat storage medium, a heat storage heat exchanger connected to the heat source unit and disposed in the heat storage tank, A brine pump for circulating brine between the heat source unit and the water-brine heat exchanger, and between the heat source unit and the heat storage heat exchanger, and a plurality of load facilities respectively connected to the heat storage tank via electric two-way valves A water pump that circulates water in the heat storage tank between the heat storage tank and a load facility, and a circulation pump that circulates water in the heat storage tank, and branches a discharge-side pipe of the circulation pump. , outer fusion type thermal storage tank, characterized in that connected between the one which is branched from the previous Kisui pump and the electric two-way valve.

A heat source unit, a water-brine heat exchanger connected to the heat source unit, a heat storage tank for storing water, a heat storage heat exchanger connected to the heat source unit and disposed in the heat storage tank, and the heat source unit A brine pump for circulating brine between the water-brine heat exchanger and between the heat source machine and the heat storage heat exchanger, and a plurality of air conditioner indoor units each connected to the heat storage tank via an electric two-way valve A water pump that circulates water in the heat storage tank between the heat storage tank and each indoor unit, and a circulation pump that circulates water in the heat storage tank, and branches a discharge side pipe of the circulation pump and, thermal storage type air conditioner which is characterized in that connected between the one which is branched from the previous Kisui pump and the electric two-way valve.