JP2007271163A - Returned hot water recovering method and hot water supply system - Google Patents

Returned hot water recovering method and hot water supply system Download PDF

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JP2007271163A
JP2007271163A JP2006097368A JP2006097368A JP2007271163A JP 2007271163 A JP2007271163 A JP 2007271163A JP 2006097368 A JP2006097368 A JP 2006097368A JP 2006097368 A JP2006097368 A JP 2006097368A JP 2007271163 A JP2007271163 A JP 2007271163A
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hot water
storage tank
return
temperature
heat exchanger
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JP4893070B2 (en
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Yoshio Tokioka
義雄 時岡
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Noritz Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supply system capable of improving operation efficiency of a heat pump unit in heating up of a tank without lowering high-temperature hot water supply performance. <P>SOLUTION: In this hot water supply system storing hot water heated by the heat pump unit 1 in the hot water storage tank 2, a plurality of hot water recovering ports D are formed on a side face of the hot water storage tank 2 at various height positions. The returned hot water is distributed to the plurality of hot water recovering ports D to be returned to the hot water storage tank 2 on the basis of a temperature of the returned hot water and a temperature distribution of hot water in the hot water storage tank 2 in returning the returned hot water from a liquid-liquid heat exchanger 3 to the hot water storage tank 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は戻り温水の回収方法および給湯システムに関し、より詳細には、ヒートポンプにより生成した温水を貯湯タンク内に貯湯するタイプの給湯システムにおいて、液々熱交換器で放熱した温水を貯湯タンクに戻す技術に関する。   The present invention relates to a return hot water recovery method and a hot water supply system, and more specifically, in a hot water supply system of a type that stores hot water generated by a heat pump in a hot water storage tank, the hot water radiated by a liquid heat exchanger is returned to the hot water storage tank. Regarding technology.

近時、一般家庭用の給湯システムとして、自然冷媒（ＣＯ２）を利用した電動ヒートポンプを熱源として加熱昇温した温水を貯湯タンクに貯湯しておくタイプの給湯システムが提案されている。そして、この種の給湯システムでは、タンク内に貯えられた温水を、カランやシャワー等の給湯栓からの出湯用として供給する（一般給湯に用いる）他、暖房や風呂の追い焚きのために設けられた液々熱交換器に循環させることによって暖房や風呂の追い焚きも行えるように構成したものが提案されている。 Recently, as a hot water supply system for general households, a hot water supply system of a type in which hot water heated and heated using an electric heat pump using natural refrigerant (CO 2 ) as a heat source is stored in a hot water storage tank has been proposed. In this type of hot water supply system, hot water stored in the tank is supplied for hot water from hot water taps such as currants and showers (used for general hot water supply), and is provided for heating and bathing. It has been proposed that it can be heated and reheated by circulating it through a liquid heat exchanger.

ところで、このように貯湯タンクに液々熱交換器への温水循環路が設けられた給湯システムでは、ヒートポンプの運転によるタンクの焚き上げ時に、該ヒートポンプの運転効率を示す成績係数（ＣＯＰ）が低下するのを抑制するため、液々熱交換器で放熱して温度が低下した温水（以下、これを「戻り温水」と称する）を貯湯タンクに戻すにあたり、タンク内に形成されている温度成層（タンク内の温水の温度差によって自然形成される温水の層）を壊さないような工夫がなされている。   By the way, in the hot water supply system in which the hot water circulation path to the liquid heat exchanger is provided in the hot water storage tank as described above, the coefficient of performance (COP) indicating the operation efficiency of the heat pump is reduced when the tank is lifted by the operation of the heat pump. In order to prevent the hot water from being radiated by the liquid heat exchanger and reducing its temperature (hereinafter referred to as “return hot water”) to the hot water storage tank, the temperature stratification formed in the tank ( The device has been devised so as not to break the hot water layer naturally formed by the temperature difference of the hot water in the tank.

特許文献１および特許文献２は、このような温度成層を壊さないように温水を貯湯タンクに戻す技術を開示している。すなわち、これらはいずれも、貯湯タンクの異なる高さ位置に、それぞれタンク内の温水の温度を検出する温度センサと戻り温水をタンク内に戻すための戻り配管とを設けておき、温度センサでタンク内の温度成層の状況を検出する一方で、戻り温水の温度を検出して、タンク内の戻り温水の温度に最も近い温度成層にある戻り配管から戻り温水をタンク内に回収させるように構成されている。   Patent Document 1 and Patent Document 2 disclose a technique for returning hot water to a hot water storage tank so as not to break such temperature stratification. That is, each of these is provided with a temperature sensor for detecting the temperature of the hot water in the tank and a return pipe for returning the return hot water to the tank at different height positions of the hot water storage tank. While detecting the temperature stratification condition in the tank, it is configured to detect the temperature of the return warm water and collect the return warm water in the tank from the return pipe in the temperature stratification closest to the temperature of the return warm water in the tank. ing.

特開２００３−１１４０５３公報JP 2003-114053 A 特開２００４−２１８９２０公報JP 2004-218920 A

しかしながら、このように戻り温水の温度に応じて一つの戻り配管を選択する構成では、戻り温水の温度と温度成層の温度が一致しない場合に以下のような問題があり、その改善が望まれていた。   However, in the configuration in which one return pipe is selected in accordance with the temperature of the return warm water as described above, there are the following problems when the temperature of the return warm water does not match the temperature of the temperature stratification, and the improvement is desired. It was.

すなわち、戻り温水の温度と温度成層の温度が一致しない場合、戻り温水はその温度よりも高温側又は低温側のいずれか一方の温度成層に戻されることになるが、ここで、高温側に戻すのを選択すると、タンク下部にある低温の温水は戻り温水と混ざらないので低温を維持でき、タンクの焚き上げ時におけるヒートポンプユニットの運転効率を高く維持できる（省エネルギーで焚き上げができる）利点があるが、その反面、タンク上部にある高温の温水が戻り温水と混ざることによってぬるめられ、高温出湯能力が低下する。   That is, when the temperature of the return warm water does not match the temperature of the temperature stratification, the return warm water is returned to the temperature stratification on either the higher temperature side or the lower temperature side than that temperature. If is selected, the low temperature warm water at the bottom of the tank is not mixed with the return warm water, so the low temperature can be maintained, and the operation efficiency of the heat pump unit when the tank is raised can be maintained high (energy saving can be achieved) However, on the other hand, the hot water at the top of the tank is warmed and mixed with the hot water, and the hot water discharge capacity is reduced.

一方、戻り温水を低温側に戻すのを選択すると、タンク上部には高温の温水が多く残り高温出湯能力は維持できるものの、タンク下部にある低温の温水は戻り温水と混ざって温度が上昇し低温を維持できなくなり、タンクの焚き上げ時におけるヒートポンプユニットの運転効率が低下してしまう。   On the other hand, if you choose to return the return warm water to the low temperature side, a lot of hot water remains in the upper part of the tank, and the high temperature hot water discharge capacity can be maintained, but the low temperature warm water at the bottom of the tank is mixed with the return warm water and the temperature rises. Can not be maintained, and the operation efficiency of the heat pump unit at the time of tank raising is lowered.

本発明は、このような従来の問題点に鑑みてなされたものであって、その目的とするところは、高温出湯能力を低下させることなく、タンクの焚き上げ時におけるヒートポンプユニットの運転効率を高く維持し得る戻り温水の回収方法および給湯システムを提供することを主たる目的とする。   The present invention has been made in view of such conventional problems, and the object of the present invention is to increase the operation efficiency of the heat pump unit at the time of raising the tank without reducing the high temperature hot water discharge capacity. The main object is to provide a method and a hot water supply system for recovering return warm water that can be maintained.

上記目的を達成するため、本発明の請求項１に係る戻り温水の回収方法は、ヒートポンプユニットで加熱昇温された温水を貯湯タンクに貯湯するタイプの給湯システムであって、上記貯湯タンクに液々熱交換器に温水を供給するための温水往き配管を有するものにおいて、上記液々熱交換器からの戻り温水を上記貯湯タンクに回収する方法であって、上記貯湯タンクに、高さ方向の位置を異ならせて複数の温水回収口を設けておき、上記液々熱交換器からの戻り温水を上記貯湯タンクに戻すに際して、上記戻り温水の温度と上記貯湯タンク内の温水の温度分布とをそれぞれ検出し、この検出した戻り温水の温度と貯湯タンク内の温水の温度分布とに応じて、上記戻り温水を複数の温水回収口に分配して戻すことを特徴とする。   In order to achieve the above object, a return hot water recovery method according to claim 1 of the present invention is a hot water supply system in which hot water heated by a heat pump unit is stored in a hot water storage tank, and a liquid is stored in the hot water storage tank. What has a hot water outlet pipe for supplying hot water to the heat exchanger, is a method of collecting the return hot water from the liquid heat exchanger to the hot water storage tank, the hot water storage tank in the height direction A plurality of hot water recovery ports are provided at different positions, and when returning the return hot water from the liquid heat exchanger to the hot water storage tank, the temperature of the return hot water and the temperature distribution of the hot water in the hot water storage tank are determined. Each return is detected, and the return hot water is distributed and returned to a plurality of hot water recovery ports according to the detected temperature of the return hot water and the temperature distribution of the hot water in the hot water storage tank.

すなわち、請求項１の発明では、液々熱交換器からの戻り温水を貯湯タンクに戻すに際して、戻り温水の温度と貯湯タンク内の温水の温度分布とに応じて、戻り温水を複数の温水回収口から貯湯タンクに分配回収させることから、戻り温水が、タンク上部にある高温の温水やタンク下部にある低温の温水と混ざりにくくなるので、高温出湯能力の低下を防止できるとともに、焚き上げ時のヒートポンプユニットの運転効率を高く維持することができ、従来のように、高温出湯能力またはヒートポンプユニットの運転効率のいずれか一方を犠牲にすることなく、双方のバランスを保ち得る給湯システムを提供できる。   That is, according to the first aspect of the present invention, when returning the return hot water from the liquid heat exchanger to the hot water storage tank, the return hot water is recovered in accordance with the temperature of the return hot water and the temperature distribution of the hot water in the hot water storage tank. Since it is distributed and collected from the mouth to the hot water storage tank, the return hot water is less likely to mix with the hot hot water at the top of the tank and the low temperature hot water at the bottom of the tank. The operation efficiency of the heat pump unit can be maintained high, and a hot water supply system that can maintain a balance between both without sacrificing either the high temperature hot water discharge capacity or the operation efficiency of the heat pump unit as in the past can be provided.

また、本発明の請求項２に係る戻り温水の回収方法は、請求項１に記載の戻り温水の回収方法において、上記戻り温水の分配は、上記貯湯タンク内で上記戻り温水の温度に最も近い高低両側の温度成層に所定の分配比率で分配するように設定されることを特徴とする。   The return warm water recovery method according to claim 2 of the present invention is the return warm water recovery method according to claim 1, wherein the return warm water distribution is closest to the temperature of the return warm water in the hot water storage tank. The temperature stratification on both the high and low sides is set to be distributed at a predetermined distribution ratio.

すなわち、請求項２に係る発明では、液々熱交換器からの戻り温水を貯湯タンクに分配回収させるにあたり、貯湯タンク内で戻り温水の温度に最も近い高低両側の温度成層に戻すため、戻り温水と貯湯タンク内の温水とが混ざることによって生ずる中温水を少なくすることができる。しかも、戻り温水を分配する際の分配比率を、たとえば、戻り温水の温度に最も近い方の温度成層により多くの戻り温水が戻るように設定することで、中温水の発生を極めて少なくすることができる。   That is, in the invention according to claim 2, when the return hot water from the liquid heat exchanger is distributed and recovered to the hot water storage tank, the return hot water is returned to the high and low temperature stratification closest to the temperature of the return hot water in the hot water storage tank. It is possible to reduce the medium hot water generated by mixing the hot water in the hot water storage tank. In addition, the distribution ratio at the time of distributing the return hot water is set so that more return hot water returns to the temperature stratification closest to the temperature of the return hot water, for example, so that the generation of intermediate temperature water can be extremely reduced. it can.

また、請求項３に係る給湯システムは、ヒートポンプユニットで加熱昇温された温水を貯湯タンクに貯湯するタイプの給湯システムであって、上記貯湯タンクに液々熱交換器に温水を供給するための温水往き配管を有するものにおいて、上記貯湯タンクに、一般給湯用の温水取出口を兼ねた温水回収口が高さ方向の位置を異ならせて複数設けられ、これら各温水回収口が流量調整弁を備えたヘッダ配管を介してそれぞれ混合ヘッダに接続されるとともに、上記液々熱交換器からの温水戻り配管が流量調整弁を介して上記混合ヘッダに接続され、上記各温水回収口の近傍にそれぞれ貯湯タンク内の温水の温度を検出するタンク温度センサが配設されるとともに、上記温水戻り配管にも上記戻り温水の温度を検出する戻り温度センサが設けられ、上記液々熱交換器からの戻り温水を貯湯タンクに戻すに際して、制御手段が、上記戻り温度センサとタンク温度センサとによって検出される戻り温水の温度と貯湯タンク内の温水の温度分布とに応じて上記戻り温水が複数の温水回収口を通じて貯湯タンクに回収されるように上記流量調整弁を制御する制御構成を備えていることを特徴とする。   According to a third aspect of the present invention, there is provided a hot water supply system in which hot water heated by a heat pump unit is stored in a hot water storage tank for supplying hot water to the liquid heat exchanger. In the hot water storage pipe having the hot water outlet piping, the hot water storage tank is provided with a plurality of hot water recovery ports that also serve as hot water outlets for general hot water supply with different positions in the height direction, and each of these hot water recovery ports has a flow control valve. Each of the hot water return pipes from the liquid heat exchanger is connected to the mixing header via a flow rate adjusting valve, and is connected to each of the hot water recovery ports. A tank temperature sensor for detecting the temperature of hot water in the hot water storage tank is provided, and a return temperature sensor for detecting the temperature of the return hot water is also provided in the hot water return pipe, When returning the return hot water from the liquid-to-liquid heat exchanger to the hot water storage tank, the control means responds to the temperature of the return hot water detected by the return temperature sensor and the tank temperature sensor and the temperature distribution of the hot water in the hot water storage tank. And a control structure for controlling the flow rate adjusting valve so that the return hot water is recovered to the hot water storage tank through a plurality of hot water recovery ports.

すなわち、請求項３に係る発明では、上記貯湯タンクに、一般給湯用の温水取出口を兼ねた温水回収口が高さ方向の位置を異ならせて複数設けられ、これら各温水回収口が流量調整弁を備えたヘッダ配管を介してそれぞれ混合ヘッダに接続され、さらに、液々熱交換器からの温水戻り配管が上記混合ヘッダに接続されているので、ヘッダ配管に設けられた流量制御弁を制御することで、液々熱交換器からの戻り温水を複数の温水回収口に分配回収させることができる。しかも、その際の分配比率も流量制御弁の弁開度や開弁時間を調節することで自由に設定できるため、請求項１または２の発明の実施に適した給湯システムを提供できる。   That is, in the invention according to claim 3, the hot water storage tank is provided with a plurality of hot water recovery ports that also serve as hot water outlets for general hot water supply with different positions in the height direction, and each of these hot water recovery ports has a flow rate adjustment. Each header is connected to the mixing header via a header pipe, and the hot water return pipe from the liquid-to-liquid heat exchanger is connected to the mixing header, so the flow control valve provided in the header pipe is controlled. By doing so, the return hot water from the liquid heat exchanger can be distributed and recovered to a plurality of hot water recovery ports. Moreover, since the distribution ratio at that time can be freely set by adjusting the valve opening degree and the valve opening time of the flow control valve, a hot water supply system suitable for carrying out the invention of claim 1 or 2 can be provided.

また、請求項４に係る給湯システムは、請求項３に記載の給湯システムにおいて、上記液々熱交換器からの温水戻り配管に設けられる流量調整弁の上流側に上記貯湯タンクに直結されたバイパス配管が設けられるとともに、このバイパス配管に該バイパス配管を流れる戻り温水の流量を調節するバイパス弁が設けられていることを特徴とする。   According to a fourth aspect of the present invention, there is provided a hot water supply system according to the third aspect, wherein a bypass directly connected to the hot water storage tank is provided upstream of a flow rate adjustment valve provided in a hot water return pipe from the liquid heat exchanger. A pipe is provided, and a bypass valve is provided in the bypass pipe for adjusting the flow rate of the return warm water flowing through the bypass pipe.

すなわち、請求項４に係る発明では、液々熱交換器からの温水戻り配管に、貯湯タンクに直結されたバイパス配管が設けられ、このバイパス配管に流量を調節するバイパス弁が設けられていることから、混合ヘッダから一般給湯用の温水を取り出すように構成した場合でもバイパス弁を開くことで貯湯タンクへの戻り温水を確保できるので、液々熱交換器の能力低下を防止できる。   That is, in the invention according to claim 4, a bypass pipe directly connected to the hot water storage tank is provided in the hot water return pipe from the liquid heat exchanger, and a bypass valve for adjusting the flow rate is provided in the bypass pipe. Therefore, even when the hot water for general hot water supply is taken out from the mixed header, the return hot water to the hot water storage tank can be secured by opening the bypass valve, so that it is possible to prevent a decrease in the capacity of the liquid heat exchanger.

また、請求項５に係る給湯システムは、ヒートポンプユニットで加熱昇温された温水を貯湯タンクに貯湯するタイプの給湯システムにおいて、上記貯湯タンクに液々熱交換器に温水を供給するための温水往き配管を有するものにおいて、上記貯湯タンクに、高さ方向の位置を異ならせて２個の温水回収口が設けられ、上記温水往き配管が、温水取込経路として２系統の温水取込口を有する第一の流路切替弁の一方の温水取込口に接続されるとともに、該第一の流路切替弁の温水出口が上記液々熱交換器と接続され、上記液々熱交換器からの温水戻り配管が、２系統の温水吐出口を備えた第二の流路切替弁の温水入口に接続され、上記温水吐出口の一方が上記第一の流路切替弁の他方の温水取込口と上記貯湯タンクの一方の温水回収口に接続されるとともに、上記温水吐出口の他方が上記貯湯タンクの他方の温水回収口と接続されていることを特徴とする。   According to a fifth aspect of the present invention, there is provided a hot water supply system in which hot water heated by a heat pump unit is stored in a hot water storage tank, in which hot water is supplied to the hot water storage tank for supplying hot water to the liquid heat exchanger. In one having a pipe, the hot water storage tank is provided with two hot water recovery ports at different heights, and the hot water outlet pipe has two hot water intake ports as hot water intake paths. The hot water outlet of the first flow path switching valve is connected to the liquid heat exchanger, and is connected to one hot water intake port of the first flow path switching valve. A warm water return pipe is connected to a warm water inlet of a second flow path switching valve having two hot water discharge ports, and one of the warm water discharge ports is the other warm water intake port of the first flow path switching valve Connected to one hot water recovery port of the hot water storage tank. Rutotomoni, the other of the hot water discharge port, characterized in that it is connected to the other of the hot water recovery port of the hot water storage tank.

すなわち、請求項５に係る発明では、貯湯タンクに高さ方向の位置を異ならせて２個の温水回収口が設けられる。そして、貯湯タンクから液々熱交換器に温水を供給するための温水往き配管が、温水取込経路として２系統の温水取込口を有する第一の流路切替弁の一方の温水取込口に接続されるとともに、該第一の流路切替弁の温水出口が上記液々熱交換器と接続され、上記液々熱交換器からの温水戻り配管が、２系統の温水吐出口を備えた第二の流路切替弁の温水入口に接続され、上記温水吐出口の一方が上記第一の流路切替弁の他方の温水取込口と上記貯湯タンクの一方の温水回収口に接続されるとともに、上記温水吐出口の他方が上記貯湯タンクの他方の温水回収口と接続されることから、上記第一および第二の流路切替弁の流路を切り替えることで、液々熱交換器からの戻り温水を２個の温水回収口に分配回収させることができる。また、この分配回収にあたり、第二の流路開切替弁を制御することで、各温水回収口への戻り温水の分配比率を自由に設定できるため、請求項１または２の発明の実施に適した給湯システムを提供できる。   That is, in the invention according to claim 5, the hot water storage tank is provided with two hot water recovery ports at different positions in the height direction. The hot water outlet pipe for supplying hot water from the hot water storage tank to the liquid heat exchanger has one hot water intake port of the first flow path switching valve having two hot water intake ports as the hot water intake path. And the hot water outlet of the first flow path switching valve is connected to the liquid-to-liquid heat exchanger, and the hot water return pipe from the liquid-to-liquid heat exchanger has two hot water discharge ports. Connected to the hot water inlet of the second channel switching valve, and one of the hot water discharge ports is connected to the other hot water intake port of the first channel switching valve and one hot water recovery port of the hot water storage tank. In addition, since the other of the hot water discharge ports is connected to the other hot water recovery port of the hot water storage tank, by switching the flow paths of the first and second flow path switching valves, from the liquid heat exchanger The return hot water can be distributed and recovered to the two hot water recovery ports. Further, in this distribution and recovery, the distribution ratio of the return hot water to each hot water recovery port can be freely set by controlling the second flow path opening switching valve, and therefore suitable for the implementation of the invention of claim 1 or 2. A hot water supply system can be provided.

本発明によれば、液々熱交換器からの戻り温水を貯湯タンクに戻すに際して、戻り温水の温度と貯湯タンク内の温水の温度分布とに応じて、戻り温水を貯湯タンクに高さ方向の位置を異ならせて設けられた複数の温水回収口に分配して戻すようにしているため、液々熱交換器で放熱して温度が低下した戻り温水が、タンク上部にある高温の温水やタンク下部にある低温の温水と混ざりにくくなるので、高温出湯能力の低下を防止できるとともに、焚き上げ時のヒートポンプユニットの運転効率を高く維持することができる。   According to the present invention, when returning the return hot water from the liquid heat exchanger to the hot water storage tank, the return hot water is returned to the hot water storage tank in the height direction according to the temperature of the return hot water and the temperature distribution of the hot water in the hot water storage tank. Since it is distributed and returned to a plurality of hot water recovery ports provided at different positions, the return hot water that has radiated heat from the liquid heat exchanger and the temperature has dropped is the hot hot water or tank in the upper part of the tank. Since it becomes difficult to mix with the low-temperature hot water in the lower part, it is possible to prevent a decrease in the high-temperature hot water discharge capacity and to maintain a high operating efficiency of the heat pump unit at the time of firing.

以下、本発明の実施形態を図面に基づいて詳細に説明する。
実施形態１
図１は、本発明を適用した給湯システムの一例を示す概略構成図である。この給湯システムは、熱源で加熱昇温された温水を貯湯タンク内に貯湯するタイプの給湯システムであって、図示例では、一般給湯（カラン等の給湯栓への出湯または風呂への温水の落とし込み）と風呂の追い焚きの双方を同時に行い得る給湯システムが示されている。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1
FIG. 1 is a schematic configuration diagram showing an example of a hot water supply system to which the present invention is applied. This hot water supply system is a hot water supply system in which hot water heated by a heat source is stored in a hot water storage tank, and in the example shown in the figure, a general hot water supply (a hot water tap such as a caran or a hot water is dropped into a bath). ) And a hot water supply system that can perform both bathing simultaneously.

具体的には、図示の給湯システムは、熱源としてのヒートポンプユニット１と、このヒートポンプユニット１で加熱昇温される温水を貯湯する貯湯タンク２と、風呂追い焚き用の液々熱交換器３と、一般給湯用の配管が接続された混合ヘッダ４と、システム全体を制御するコントローラ（制御手段）５とを主要部として備えている。   Specifically, the illustrated hot water supply system includes a heat pump unit 1 as a heat source, a hot water storage tank 2 for storing hot water heated by the heat pump unit 1, a liquid heat exchanger 3 for reheating a bath, The main part includes a mixing header 4 to which piping for general hot water supply is connected and a controller (control means) 5 for controlling the entire system.

上記ヒートポンプユニット１は、自然冷媒（ＣＯ２）を用いた周知の構成よりなる電動ヒートポンプであって、ここではその詳細な説明は省略するが、大気の熱を冷媒に吸収させるための熱交換器４１と、冷媒を圧縮して高温にするための電動コンプレッサ４２と、昇温された冷媒の熱で水を加熱昇温させるための熱交換器４３と、圧縮された冷媒の圧力を下げるための膨張弁４４とを主要部として構成されている。 The heat pump unit 1 is an electric heat pump having a known configuration using a natural refrigerant (CO 2 ), and a detailed description thereof is omitted here, but a heat exchanger for causing the refrigerant to absorb atmospheric heat. 41, an electric compressor 42 for compressing the refrigerant to a high temperature, a heat exchanger 43 for heating and heating water with the heat of the raised refrigerant, and a pressure for reducing the pressure of the compressed refrigerant The expansion valve 44 is a main part.

そして、このヒートポンプユニット１の熱交換器４３には、市水道と上記貯湯タンク２のタンク下部とに連結された入水管６と、熱交換器４３で加熱昇温される温水を上記貯湯タンク２に供給するための出湯管７とが接続されるとともに、これら入水管６または出湯管７のいずれか一方に循環ポンプ８が設けられ（図示例では入水管６側に設けられた場合を示す）、貯湯タンク２の焚き上げ時にこの循環ポンプ８を駆動させることによって、貯湯タンク２とヒートポンプユニット１との間で湯水の強制循環ができるように構成されている。   And in the heat exchanger 43 of this heat pump unit 1, the water pipe 6 connected with the city water supply and the tank lower part of the said hot water storage tank 2, and the hot water heated and heated by the heat exchanger 43 are sent to the said hot water storage tank 2 And a circulating pump 8 is provided in either one of the water inlet pipe 6 or the hot water outlet pipe 7 (in the illustrated example, the case where it is provided on the side of the water inlet pipe 6 is shown). The circulating pump 8 is driven when the hot water storage tank 2 is lifted so that hot water is forcibly circulated between the hot water storage tank 2 and the heat pump unit 1.

一方、貯湯タンク２は、密閉構造のタンクであって、タンク上部に上記ヒートポンプユニット１で加熱昇温された温水を取り込むための温水入口Ａと上記風呂追い焚き用の液々熱交換器３に供給する温水を取り出すための温水取出口Ｂとが設けられ、上記温水入口Ａには上記出湯管７が、上記温水取出口Ｂには液々熱交換器３と連通する温水往き配管９がそれぞれ接続されている。また、タンク下部には水出入口Ｃが設けられ、この水出入口Ｃと上記入水管６の間にはこれらを連通させる下部配管１０が配設されるとともに、この下部配管１０には水量センサ２８が設けられている。   On the other hand, the hot water storage tank 2 is a sealed tank, and is connected to the hot water inlet A for taking in the hot water heated by the heat pump unit 1 and the liquid heat exchanger 3 for reheating the bath in the upper part of the tank. A hot water outlet B for taking out the hot water to be supplied is provided, the hot water inlet A is provided with the hot water outlet pipe 7, and the hot water outlet B is provided with a hot water outlet pipe 9 communicating with the liquid heat exchanger 3. It is connected. In addition, a water inlet / outlet C is provided at the lower part of the tank, and a lower pipe 10 is provided between the water inlet / outlet C and the water inlet pipe 6, and a water amount sensor 28 is provided in the lower pipe 10. Is provided.

そして、本実施形態では、この貯湯タンク２には、一般給湯用の温水取出口を兼ねた温水回収口Ｄが高さ方向の位置を異ならせて複数（図示例では４箇所に）開設されている。具体的には、図示の給湯システムでは、この温水回収口Ｄとして、貯湯タンク２の上部に１箇所、タンク側面に２箇所、さらにタンク下部に上記水出入口Ｃと兼用する形で１箇所の合計４箇所に温水回収口Ｄが設けられている。   In this embodiment, the hot water storage tank 2 is provided with a plurality of hot water recovery ports D serving as hot water outlets for general hot water supply at different positions in the height direction (four in the illustrated example). Yes. Specifically, in the illustrated hot water supply system, the hot water recovery port D has a total of one location at the top of the hot water storage tank 2, two locations on the side of the tank, and a single location that also serves as the water inlet / outlet C at the bottom of the tank. Hot water recovery ports D are provided at four locations.

これら各温水回収口Ｄは、それぞれ流量調整弁１２を備えたヘッダ配管１１を介して上記混合ヘッダ４と配管接続される。そして、各温水回収口Ｄの近傍には、それぞれ貯湯タンク２内の温水の温度を検出するためのタンク温度センサ（温度センサ）１３が配設され、各温度センサ１３の検出値が上記コントローラ５に入力されるように構成されている。   Each of these hot water recovery ports D is connected to the mixing header 4 via a header pipe 11 provided with a flow rate adjusting valve 12. In the vicinity of each hot water recovery port D, a tank temperature sensor (temperature sensor) 13 for detecting the temperature of the hot water in the hot water storage tank 2 is disposed, and the detected value of each temperature sensor 13 is the controller 5. It is comprised so that it may be input.

なお、以下の説明では、個々の温水回収口Ｄ並びに各温水回収口Ｄに接続されるヘッダ配管１１や流量調整弁１２、タンク温度センサ１３を他のものと区別するために、タンク上部側に設けられたものから順に符号の末尾にａ〜ｄを付すものとする。   In the following description, in order to distinguish the individual hot water recovery ports D and the header pipes 11, the flow rate adjustment valves 12, and the tank temperature sensors 13 connected to the hot water recovery ports D from the other, It is assumed that “a” to “d” are added to the end of the reference numerals in order from the provided one.

液々熱交換器３は、風呂追い焚き用の熱交換器であって、一次側の温水入り側には上記温水往き配管９が接続されるとともに、放熱後の温水（戻り温水）の出側には流量調整弁１５を備えた温水戻り配管１４が接続され、この温水戻り配管１４の先端が上記混合ヘッダ４に接続されている。そして、上記温水往き配管９には、風呂追い焚き用の循環ポンプ１６が設けられており、この循環ポンプ１６を駆動させることによって、貯湯タンク２の温水取出口Ｂから取り出した温水を、液々熱交換器３の温水入側に供給できるように構成されている。   The liquid heat exchanger 3 is a heat exchanger for reheating a bath. The hot water outlet pipe 9 is connected to the primary hot water inlet side, and the outlet side of the hot water after returning heat (return hot water). Is connected to a hot water return pipe 14 having a flow rate adjusting valve 15, and the tip of the hot water return pipe 14 is connected to the mixing header 4. The hot water outlet pipe 9 is provided with a circulation pump 16 for bathing the bath. By driving the circulation pump 16, the hot water taken out from the hot water outlet B of the hot water storage tank 2 is liquefied. The heat exchanger 3 is configured to be supplied to the hot water inlet side.

一方、上記温水戻り配管１４には、液々熱交換器３からの戻り温水の温度を検出するための戻り温度センサ（温度センサ）１７が設けられ、この戻り温度センサ１７の検出値も温度情報として上記コントローラ５に入力される。また、この温水戻り配管１４には、上記流量調整弁１５の上流側から分岐したバイパス配管１８が設けられており、このバイパス配管１８が流量調整弁１９を介して貯湯タンク２に連通するように配設されている。   On the other hand, the warm water return pipe 14 is provided with a return temperature sensor (temperature sensor) 17 for detecting the temperature of the return warm water from the liquid heat exchanger 3, and the detected value of the return temperature sensor 17 is also temperature information. Is input to the controller 5. The hot water return pipe 14 is provided with a bypass pipe 18 branched from the upstream side of the flow rate adjusting valve 15 so that the bypass pipe 18 communicates with the hot water storage tank 2 via the flow rate adjusting valve 19. It is arranged.

なお、液々熱交換器３の二次側は、該液々熱交換器３によって追い焚きされる浴槽２０内の湯水（浴槽水）が循環するように構成されている。具体的には、液々熱交換器３の二次側の一端には、浴槽２０の内側面に設けられる循環アダプタ（図示せず）と接続され、液々熱交換器３で加熱昇温された浴槽水を循環アダプタ（浴槽２０）に供給する追い焚き往き配管２１が接続され、他端には浴槽水を液々熱交換器３へ戻す追い焚き戻り配管２２が接続される。そして、この追い焚き戻り配管２２には浴槽水循環用の循環ポンプ２３が設けられ、この循環ポンプ２３を駆動することによって、浴槽２０内の湯水を液々熱交換器３の二次側に強制循環させることができるように構成されている。   In addition, the secondary side of the liquid-liquid heat exchanger 3 is configured such that hot water (tub water) in the bathtub 20 driven by the liquid-liquid heat exchanger 3 circulates. Specifically, one end of the secondary side of the liquid-liquid heat exchanger 3 is connected to a circulation adapter (not shown) provided on the inner surface of the bathtub 20, and the liquid-temperature heat exchanger 3 is heated and heated. A recirculation pipe 21 for supplying the bathtub water to the circulation adapter (tub 20) is connected, and a recirculation return pipe 22 for returning the bathtub water to the liquid heat exchanger 3 is connected to the other end. The recirculation return pipe 22 is provided with a circulation pump 23 for circulating the bathtub water. By driving the circulation pump 23, hot water in the bathtub 20 is forcibly circulated to the secondary side of the liquid heat exchanger 3. It is comprised so that it can be made to.

混合ヘッダ４は、後述するように、上記液々熱交換器３からの戻り温水を貯湯タンク２に戻すための温水戻り経路の一部を構成するとともに、一般給湯時には管内に流入する湯水を混合して湯水の温度を安定させる働きを有するヘッダ装置であって、上述したように、貯湯タンク２からのヘッダ配管１１ａ〜１１ｄと液々熱交換器３からの温水戻り配管１４とが接続されるとともに、給湯栓（給湯バルブ）２４を備えた一般給湯用の配管２５が接続されている。なお、この配管２５にも、該配管２５内を流れる温水の温度を検出するための給湯温度センサ２６が設けられており、この給湯温度センサ２６の検出値も温度情報として上記コントローラ５に供給される。   As will be described later, the mixing header 4 constitutes a part of a hot water return path for returning the hot water returned from the liquid heat exchanger 3 to the hot water storage tank 2 and mixes hot water flowing into the pipe during general hot water supply. Thus, the header device has a function of stabilizing the temperature of the hot water, and as described above, the header pipes 11a to 11d from the hot water storage tank 2 and the hot water return pipe 14 from the liquid heat exchanger 3 are connected. In addition, a general hot water supply pipe 25 provided with a hot water tap (hot water supply valve) 24 is connected. The pipe 25 is also provided with a hot water temperature sensor 26 for detecting the temperature of the hot water flowing in the pipe 25. The detected value of the hot water temperature sensor 26 is also supplied to the controller 5 as temperature information. The

コントローラ５は、このシステム全体の制御を行う制御装置であって、所定の制御プログラムを搭載したマイクロコンピュータを主要部として備えている。より詳細には、このコントローラ５は、所定の操作部を備えた操作装置（リモコン）２７を有しており、このリモコン２７で入力される操作情報や上記タンク温度センサ１３ａ〜１３ｄや戻り温度センサ１７、さらには給湯温度センサ２６から入力される温度情報に基づいて上記流量調整弁１２ａ〜１２ｄ、１５、１９を制御する他、ヒートポンプユニット１の運転／停止などの動作制御を行う（詳細は後述する）。   The controller 5 is a control device that controls the entire system, and includes a microcomputer having a predetermined control program as a main part. More specifically, the controller 5 includes an operation device (remote controller) 27 having a predetermined operation unit. Operation information input by the remote controller 27, the tank temperature sensors 13a to 13d, the return temperature sensor, and the like. 17 and further controlling the flow rate adjusting valves 12a to 12d, 15 and 19 based on temperature information inputted from the hot water supply temperature sensor 26, as well as operating control such as operation / stop of the heat pump unit 1 (details will be described later). To do).

しかして、このように構成された給湯システムの動作について説明する。
Ａ：風呂追い焚き並びに戻り温水の回収について
本実施形態の給湯システムでは、風呂の追い焚きを行う場合、リモコン２７での風呂追い焚き操作を受け付けたコントローラ５が、風呂追い焚き用の循環ポンプ１６と浴槽水循環用の循環ポンプ２３を駆動させて液々熱交換器３の一次側および二次側のそれぞれに湯水を循環させる。すなわち、循環ポンプ１６の駆動により、貯湯タンク２の上部に貯えられている高温の温水が温水取出口Ｂから温水往き配管９を通じて液々熱交換器３の一次側に供給されるとともに、循環ポンプ２３の駆動によって、浴槽２０内の浴槽水が追い焚き戻り配管２２から液々熱交換器３の二次側に供給され、液々熱交換器３で加熱昇温（追い焚き）され、追い焚き往き配管２１を介して浴槽２０に戻される。 The operation of the hot water supply system configured as described above will be described.
A: About Bath Reheating and Recovery of Returned Hot Water In the hot water supply system of this embodiment, when performing bath reheating, the controller 5 that has received a bath reheating operation with the remote controller 27 is configured to use the circulation pump 16 for reheating the bath. And the circulation pump 23 for bath water circulation is driven, and hot water is circulated to each of the primary side and the secondary side of the liquid heat exchanger 3. That is, when the circulation pump 16 is driven, hot hot water stored in the upper part of the hot water storage tank 2 is supplied from the hot water outlet B to the primary side of the liquid heat exchanger 3 through the hot water outlet pipe 9, and the circulation pump By driving 23, the bathtub water in the bathtub 20 is replenished and supplied from the return pipe 22 to the secondary side of the liquid-liquid heat exchanger 3, heated by the liquid-liquid heat exchanger 3 (heated), and reheated. It is returned to the bathtub 20 via the forward piping 21.

一方、液々熱交換器３の一次側の戻り温水について、本発明の給湯システムでは、液々熱交換器３からの戻り温水を貯湯タンク２に回収させるにあたり、戻り温水の温度と貯湯タンク２内の温水の温度分布とに応じて、戻り温水を、貯湯タンク２に高さ方向の位置を異ならせて設けられた複数の温水回収口Ｄに分配して戻すように構成されている。   On the other hand, regarding the return hot water on the primary side of the liquid heat exchanger 3, in the hot water supply system of the present invention, when the return hot water from the liquid heat exchanger 3 is collected in the hot water storage tank 2, the temperature of the return hot water and the hot water storage tank 2 are recovered. The return hot water is distributed and returned to a plurality of hot water recovery ports D provided in the hot water storage tank 2 at different positions in the height direction in accordance with the temperature distribution of the hot water inside.

そこで、この戻り温水の回収手順の一例を図２に基づいて説明する。以下の説明にあたり、貯湯タンク２内の温度成層が図２に示すように形成され、また、液々熱交換器３からの戻り温水の温度が５５℃であると仮定する。   An example of the procedure for collecting the return warm water will be described with reference to FIG. In the following description, it is assumed that the temperature stratification in the hot water storage tank 2 is formed as shown in FIG. 2 and the temperature of the return hot water from the liquid heat exchanger 3 is 55 ° C.

この場合、上記タンク温度センサ１３ａ〜１３ｄは、１３ａが８０℃、１３ｂが６０℃、１３ｃが３０℃、１３ｄが１５℃を検出し、上記戻り温度センサ１７は５５℃を検出し、これらの温度情報が上記コントローラ５に入力される。   In this case, the tank temperature sensors 13a to 13d detect 13 ° at 80 ° C., 13b at 60 ° C., 13c at 30 ° C. and 13d at 15 ° C., and the return temperature sensor 17 detects 55 ° C. Information is input to the controller 5.

コントローラ５は、上記戻り温水を貯湯タンク２に戻すにあたり、上記タンク温度センサ１３ａ〜１３ｄで検出されたタンク内の温水の温度分布と、戻り温度センサ１７で検出された戻り温水の温度とに応じて、上記戻り温水を複数の温水回収口Ｄに分配して貯湯タンク２内に戻す。具体的には、コントローラ５は、上記戻り温度センサ１７の検出値（戻り温水の温度）に対して高低双方につき最も近い温度を示すタンク温度センサ（この場合、１３ｂ，１３ｃ）を割り出し、これらの温度センサ１３ｂ，１３ｃの近傍にある流量制御弁１２ｂ，１２ｃを開いて（他の流量調整弁１２ａ，１２ｄは全閉）、ヘッダ配管１１ｂ，１１ｃおよび温水回収口Ｄｂ，Ｄｃを通じて、これらに所定の分配比率Ｐで戻り温水を分配回収させる。   When returning the return hot water to the hot water storage tank 2, the controller 5 depends on the temperature distribution of the hot water in the tank detected by the tank temperature sensors 13 a to 13 d and the temperature of the return hot water detected by the return temperature sensor 17. The return hot water is distributed to the plurality of hot water recovery ports D and returned to the hot water storage tank 2. Specifically, the controller 5 determines tank temperature sensors (in this case, 13b and 13c) that indicate the closest temperatures for both high and low with respect to the detection value of the return temperature sensor 17 (the temperature of the return warm water). The flow rate control valves 12b and 12c in the vicinity of the temperature sensors 13b and 13c are opened (the other flow rate adjustment valves 12a and 12d are fully closed), and the header pipes 11b and 11c and the hot water recovery ports Db and Dc are connected to the predetermined flow rate control valves 12b and 12c. The return hot water is distributed and collected at a distribution ratio P.

このように、本発明の給湯システムでは、液々熱交換器３からの戻り温水を、該戻り温水の温度に最も近い温度を示す高低２層の温度成層に分配して回収させることから、戻り温水を貯湯タンク２内に戻すことによって、高温出湯能力またはヒートポンプユニット１の運転効率の一方が著しく損なわれることが防止される。   As described above, in the hot water supply system of the present invention, the return hot water from the liquid heat exchanger 3 is distributed and recovered to the two high temperature stratifications indicating the temperature closest to the temperature of the return hot water. By returning the hot water into the hot water storage tank 2, it is possible to prevent one of the high temperature hot water discharge capacity and the operation efficiency of the heat pump unit 1 from being significantly impaired.

ここで、上記配分比率Ｐは、たとえば、戻り温水の温度と、該戻り温水の温度に最も近い温度を示す高低２層の温度成層の各温度との温度差に基づいて、以下のように決定される。すなわち、上述したように戻り温水の温度が５５℃である場合、高温側の温度成層の温度（６０℃）から戻り温水の温度（５５℃）を減算して得た値ｘと、戻り温水の温度（５５℃）から低温側の温度成層の温度（３０℃）を減算して得た値ｙの比（ｘ：ｙ＝１：５）に応じて、戻り温水との温度差の小さい方の温度成層側（この場合、高温側）への配分比率が多くなるように設定される。つまり、この場合であれば、高温側対低温側の配分比率Ｐは５対１となるように設定される。   Here, the distribution ratio P is determined as follows, for example, based on the temperature difference between the temperature of the return hot water and each temperature of the two layers of the high and low temperature layers indicating the temperature closest to the temperature of the return hot water. Is done. That is, as described above, when the temperature of the return warm water is 55 ° C., the value x obtained by subtracting the temperature (55 ° C.) of the return warm water from the temperature of the temperature stratification (60 ° C.) on the high temperature side, and the return warm water Depending on the ratio (x: y = 1: 5) of the value y obtained by subtracting the temperature (30 ° C.) of the low temperature side temperature stratification from the temperature (55 ° C.), the one with the smaller temperature difference from the return hot water The distribution ratio to the temperature stratification side (in this case, the high temperature side) is set to be large. That is, in this case, the distribution ratio P between the high temperature side and the low temperature side is set to be 5: 1.

なお、この配分比率Ｐについては、上述したように、予め定めた計算式に基づいてコントローラ５が一律に決定するように構成することも可能であるが、たとえば、計算式に基づいて得られた配分比率Ｐをリモコン２７などの操作によって修正できるように構成することも可能である。   As described above, the distribution ratio P can be configured so that the controller 5 is uniformly determined based on a predetermined calculation formula, but is obtained based on the calculation formula, for example. It is also possible to configure so that the distribution ratio P can be corrected by operating the remote controller 27 or the like.

すなわち、上述した例では、戻り温水との温度差の小さい方の温度成層に戻り温水を多く戻すように配分比率Ｐを設定したが、戻り温水を高温側、低温側のいずれに多く戻すかによって高温出湯能力やヒートポンプユニット１の運転効率に影響が出るため、高温出湯能力を重視するか（機能重視）、それともヒートポンプユニット１の運転効率を重視するか（省エネ重視）をリモコン２７の操作によってユーザに選択させ、この選択に基づいて、上記計算によって得られた配分比率Ａを修正可能に構成しておくことも可能である。   That is, in the above-described example, the distribution ratio P is set so as to return more warm water to the temperature stratification with the smaller temperature difference from the return warm water, but depending on whether the returned warm water is returned to the higher temperature side or the lower temperature side. Since the high temperature hot water discharge capacity and the operation efficiency of the heat pump unit 1 are affected, whether the high temperature hot water discharge capacity is important (function-oriented) or the operation efficiency of the heat pump unit 1 (energy-saving priority) is determined by operating the remote controller 27. The distribution ratio A obtained by the above calculation can be modified based on this selection.

たとえば、計算によって得られた高温側対低温側の配分比率Ｐが５対１である場合に、ユーザが機能重視を選択していると、この配分比率Ｐの高温側への比率を下げて低温側への比率を上げ（たとえば４対２に修正する）、反対に、省エネ重視が選択されている場合には、高温側への比率を上げて低温側への比率を下げる構成を採用することができる。   For example, when the distribution ratio P between the high temperature side and the low temperature side obtained by calculation is 5 to 1, and the user selects function-oriented, the ratio of the distribution ratio P to the high temperature side is lowered to reduce the temperature. Increase the ratio to the side (for example, correct to 4 to 2), and conversely if energy saving is selected, adopt a configuration that increases the ratio to the high temperature side and decreases the ratio to the low temperature side Can do.

また、戻り温水の分配回収の具体的な手順については、上述したように、６０℃と３０℃の温度成層に５対１の割合で戻り温水を戻す場合、上記コントローラ５は、６０℃の温度成層にある温水回収口Ｄｂと３０℃の温度成層にある温水回収口Ｄｃに接続されたヘッダ配管１１ｂ、１１ｃの流量調整弁１２ｂ、１２ｃを開き（他の流量調整弁１２ａ，１２ｄは全閉）、その弁開度または開弁時間を調節して温水回収口Ｄｂ，Ｄｃへの配分比率が５対１となるように流量調整弁１２ｂ、１２ｃを制御する。   As for the specific procedure of the distribution and recovery of the return warm water, as described above, when returning the return warm water at a ratio of 5: 1 to the temperature stratification at 60 ° C. and 30 ° C., the controller 5 has a temperature of 60 ° C. Open the flow control valves 12b and 12c of the header pipes 11b and 11c connected to the hot water recovery port Db in the stratification and the hot water recovery port Dc in the temperature stratification at 30 ° C. (other flow control valves 12a and 12d are fully closed). The flow rate adjusting valves 12b and 12c are controlled so that the distribution ratio to the hot water recovery ports Db and Dc is 5 to 1 by adjusting the valve opening or the valve opening time.

このように、本発明の給湯システムでは、液々熱交換器３からの戻り温水を複数の温水回収口Ｄから貯湯タンク２に戻すにあたり、戻り温水の温度に最も近い高低２層の温度成層に対して、戻り温水との温度差に応じて温度差の小さい温度成層に戻り温水の多くを戻すように分配比率Ｐを決定することから、貯湯タンク２に形成されている温度成層に与える影響が少ない状態で、戻り温水を貯湯タンク２内に戻すことができる。   As described above, in the hot water supply system of the present invention, when returning the return hot water from the liquid heat exchanger 3 to the hot water storage tank 2 from the plurality of hot water recovery ports D, the temperature stratification of the two layers high and low closest to the temperature of the return hot water is performed. On the other hand, since the distribution ratio P is determined so as to return most of the warm water to the temperature stratification with a small temperature difference according to the temperature difference with the return warm water, the influence on the temperature stratification formed in the hot water storage tank 2 is affected. The returned warm water can be returned to the hot water storage tank 2 in a small state.

Ｂ：一般給湯について
次に、給湯栓２４からの一般給湯について説明する。一般給湯における給湯設定温度はリモコン２７により設定され、その情報がコントローラ５に与えられる。コントローラ５は、このリモコン２７での設定に基づいて、給湯栓２４から給湯設定温度の温水が出湯されるように上記流量調整弁１２ａ〜１２ｄを制御する。 B: General Hot Water Supply Next, general hot water supply from the hot water tap 24 will be described. The hot water supply set temperature in the general hot water supply is set by the remote controller 27, and the information is given to the controller 5. The controller 5 controls the flow rate adjusting valves 12 a to 12 d so that hot water having a hot water supply set temperature is discharged from the hot water tap 24 based on the setting by the remote controller 27.

この制御にあたり、コントローラ５は、貯湯タンク２内にあるいわゆる中温水（具体的には、２０℃乃至６０℃程度の温水）を積極的に一般給湯に利用するように構成される。具体的には、たとえばリモコン２７で設定された給湯設定温度が４０℃であり、貯湯タンク２内の温水の温度分布が図２に示すように分布しているとした場合、コントローラ５は、給湯設定温度である４０℃の温水を生成するにあたり、この給湯設定温度（４０℃）に最も近い温度を示す高低２層の温度成層（この場合、６０℃と３０℃）の温水を用いる。   In this control, the controller 5 is configured to actively use so-called medium-temperature water (specifically, hot water of about 20 ° C. to 60 ° C.) in the hot water storage tank 2 for general hot water supply. Specifically, for example, when the hot water supply set temperature set by the remote controller 27 is 40 ° C. and the temperature distribution of the hot water in the hot water storage tank 2 is distributed as shown in FIG. In generating hot water of 40 ° C., which is the preset temperature, hot water of two layers of high and low temperature (in this case, 60 ° C. and 30 ° C.) showing the temperature closest to the hot water supply preset temperature (40 ° C.) is used.

すなわち、コントローラ５は、タンク温度センサ１３ａ〜１３ｄから得た温度情報に基づいて、給湯設定温度（４０℃）に対して高低双方につき最も近い温度を示すタンク温度センサ１３ｂ，１３ｃを割り出し、これらの温度センサ１３ｂ，１３ｃの近傍にある流量制御弁１２ｂ，１２ｃを開いて（他の流量調整弁１２ａ，１２ｄは全閉）、それらの弁開度を調節し、混合ヘッダ４内で上記給湯設定温度（４０℃）の温水が生成されるようにする。これにより、上記給湯栓２４からは、混合ヘッダ４内で生成された温水、つまり給湯設定温度の温水が出湯される。   That is, based on the temperature information obtained from the tank temperature sensors 13a to 13d, the controller 5 determines the tank temperature sensors 13b and 13c that indicate the closest temperatures for both high and low relative to the hot water supply set temperature (40 ° C.). The flow rate control valves 12b and 12c in the vicinity of the temperature sensors 13b and 13c are opened (the other flow rate adjustment valves 12a and 12d are fully closed), their valve opening degrees are adjusted, and the hot water supply set temperature is set in the mixing header 4 (40 ° C) warm water is generated. As a result, hot water generated in the mixing header 4, that is, hot water having a hot water supply set temperature is discharged from the hot water tap 24.

一方、リモコン２７で設定される給湯設定温度が中温水の温度範囲を超えて高温または低温に設定された場合にも、上記コントローラ５は、上述した制御と同様の制御を行う。すなわち、たとえば、給湯設定温度が６５℃の場合を例に説明すると、この場合、給湯設定温度（６５℃）に対して高低双方につき最も近い温度を示すタンク温度センサ１３ａ，１３ｂを割り出し、これらの温度センサ１３ａ，１３ｂの近傍にある流量制御弁１２ａ，１２ｂを開いて（他の流量調整弁１２ｃ，１２ｄは全閉）、それらの弁開度を調節し、混合ヘッダ４内で上記給湯設定温度（６５℃）の温水が生成されるようにする。これにより、上記給湯栓２４からは、混合ヘッダ４内で生成された温水、つまり給湯設定温度の温水が出湯される。   On the other hand, also when the hot water supply set temperature set by the remote controller 27 exceeds the temperature range of the medium temperature water and is set to a high temperature or a low temperature, the controller 5 performs the same control as the above-described control. That is, for example, a case where the hot water supply set temperature is 65 ° C. will be described as an example. In this case, the tank temperature sensors 13a and 13b indicating the temperatures closest to the hot water set temperature (65 ° C.) are determined. The flow rate control valves 12a and 12b in the vicinity of the temperature sensors 13a and 13b are opened (the other flow rate adjustment valves 12c and 12d are fully closed), their valve openings are adjusted, and the hot water supply set temperature is set in the mixing header 4 (65 ° C) warm water is generated. As a result, hot water generated in the mixing header 4, that is, hot water having a hot water supply set temperature is discharged from the hot water tap 24.

なお、上述した一般給湯における制御は、風呂の追い焚き運転が行われていない場合（一般給湯単独の場合）について説明したが、風呂の追い焚き運転が同時に行われている場合には、温水戻り配管１４から戻り温水が混合ヘッダ４内に戻ってくるので、コントローラ５は、上述した給湯設定温度とタンク温度センサ１３ａ〜１３ｄからの温度情報に加え、戻り温度センサ１７からの温度情報も用いて流量制御弁１５の弁開度も調節して混合ヘッダ４内の温水の温度が給湯設定温度となるように制御を行う。その際、流量制御弁１５で戻り温水の流量を絞りすぎると風呂の追い焚き能力が低下するので、かかる場合にはバイパス配管１８の流量調整弁１９を開いて（流量調整弁１９の弁開度を制御して）、風呂追い焚きの能力が低下しないよう調節する。   In addition, although the control in the general hot water supply mentioned above demonstrated the case where the reheating operation of a bath was not performed (in the case of a general hot water supply alone), when the reheating operation of a bath is performed simultaneously, return to warm water Since the return hot water returns from the pipe 14 into the mixing header 4, the controller 5 uses temperature information from the return temperature sensor 17 in addition to the hot water supply set temperature and the temperature information from the tank temperature sensors 13 a to 13 d described above. The valve opening degree of the flow control valve 15 is also adjusted so that the temperature of the hot water in the mixing header 4 is controlled to the hot water supply set temperature. At that time, if the flow rate of the return hot water is too narrowed by the flow rate control valve 15, the ability to retreat the bath is lowered. In this case, the flow rate adjustment valve 19 of the bypass pipe 18 is opened (the valve opening degree of the flow rate adjustment valve 19 ) And adjust so that the ability of bathing is not reduced.

なお、この風呂追い焚き運転に関しては、他の実施形態として、風呂の追い焚き運転中に給湯栓が開かれ、一般給湯を行う場合には、一旦、風呂の追い焚き運転を停止させ、一般給湯が終了した後に風呂の追い焚き運転を再開するように構成してもよい。また、一般給湯中に風呂の追い焚き運転が要求された場合にｈ、一旦、風呂の追い焚き運転を待機させ、一般給湯が終了した後に風呂の追い焚き運転を開始するように構成してもよい。   With regard to this bath reheating operation, as another embodiment, when the hot water tap is opened during the bath reheating operation and general hot water supply is performed, the bath reheating operation is temporarily stopped and the general hot water supply is stopped. It may be configured so that the bath reheating operation is resumed after the operation is completed. Further, when a bath reheating operation is requested during the general hot water supply, h, the bath reheating operation is once waited, and the bath reheating operation is started after the general hot water supply is finished. Good.

また、上述した実施形態では、液々熱交換器３の二次側に風呂追い焚き用の循環回路を接続した場合を示したが、液々熱交換器３の二次側に接続する負荷として温水暖房器具（温水暖房用の循環回路）を用いることもできる。図３は、液々熱交換器３の二次側に温水暖房用の循環回路を接続した一例を示しており、図示の場合、液々熱交換器３の二次側には、暖房用のヘッダ２９と接続された暖房往き配管３０と暖房戻り配管３１とが接続され、このヘッダ２９に個々の温水暖房器具（図示例では、浴室乾燥機３２と床暖房パネル３３）が配管接続され、暖房用の循環ポンプ３４により、これら温水暖房器具３２，３３と液々熱交換器３の二次側との間で熱媒の強制循環ができるように構成される。   Moreover, although the case where the circulation circuit for bath reheating was connected to the secondary side of the liquid-liquid heat exchanger 3 was shown in the above-described embodiment, as a load connected to the secondary side of the liquid-liquid heat exchanger 3 A hot water heater (circulation circuit for hot water heating) can also be used. FIG. 3 shows an example in which a circulation circuit for hot water heating is connected to the secondary side of the liquid-to-liquid heat exchanger 3, and in the illustrated case, the secondary side of the liquid-to-liquid heat exchanger 3 is connected to the heating side. A heating return pipe 30 and a heating return pipe 31 connected to the header 29 are connected, and individual hot water heaters (in the illustrated example, a bathroom dryer 32 and a floor heating panel 33) are connected to the header 29 by heating. The circulation pump 34 is configured so that the heat medium can be forcedly circulated between the hot water heaters 32 and 33 and the secondary side of the liquid heat exchanger 3.

実施形態２
次に、本発明の第二の実施形態について図４に基づいて説明する。図４は、第二の実施形態に係る給湯システムの一例を示す概略構成図である。 Embodiment 2
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a schematic configuration diagram illustrating an example of a hot water supply system according to the second embodiment.

図示のように、この給湯システムは、ヒートポンプユニットで加熱昇温された温水を貯湯タンクに貯湯するタイプの給湯システムであって、貯湯タンクに液々熱交換器に温水を供給するための温水往き配管を有する点、及び貯湯タンクに高さ方向の位置を異ならせて複数の温水回収口を備える点で上述した実施形態１と構成が共通するが、一般給湯用の温水取出口が独立して設けられている点、及び液々熱交換器からの戻り温水の経路等については実施形態１と相違する。   As shown in the figure, this hot water supply system is a hot water supply system in which hot water heated by a heat pump unit is stored in a hot water storage tank, and the hot water is supplied to the hot water storage tank for supplying hot water to the liquid heat exchanger. Although the configuration is the same as that of the first embodiment described above in that it has a piping and a hot water storage tank with different positions in the height direction and includes a plurality of hot water recovery ports, the hot water outlet for general hot water supply is independent. The point provided, the path of the return hot water from the liquid heat exchanger, and the like are different from the first embodiment.

具体的には、図示の給湯システムは、熱源としてのヒートポンプユニット１０１と、このヒートポンプユニット１０１で加熱昇温される温水を貯湯する貯湯タンク１０２と、暖房熱媒加熱用の液々熱交換器１０３と、システム全体を制御するコントローラ（制御手段）１０４とを主要部として備えている。   Specifically, the illustrated hot water supply system includes a heat pump unit 101 as a heat source, a hot water storage tank 102 for storing hot water heated by the heat pump unit 101, and a liquid heat exchanger 103 for heating a heating heat medium. And a controller (control means) 104 for controlling the entire system.

上記ヒートポンプユニット１０１は、自然冷媒（ＣＯ２）を用いた周知の構成よりなる電動ヒートポンプであって、ここではその詳細な説明は省略するが、大気の熱を冷媒に吸収させるための熱交換器１３１と、冷媒を圧縮して高温にするための電動コンプレッサ１３２と、昇温された冷媒の熱で水を加熱昇温させるための熱交換器１３３と、圧縮された冷媒の圧力を下げるための膨張弁１３４とを主要部として構成されている。 The heat pump unit 101 is an electric heat pump having a known configuration using a natural refrigerant (CO 2 ), and a detailed description thereof is omitted here, but a heat exchanger for causing the refrigerant to absorb atmospheric heat. 131, an electric compressor 132 for compressing the refrigerant to a high temperature, a heat exchanger 133 for heating and heating water with the heat of the raised refrigerant, and a pressure for reducing the pressure of the compressed refrigerant The expansion valve 134 is a main part.

そして、このヒートポンプユニット１０１の熱交換器１３３には、市水道と上記貯湯タンク１０２のタンク下部とに連結された入水管１０５と、熱交換器１３３で加熱昇温される温水を上記貯湯タンク１０２に供給するための出湯管１０６とが接続されるとともに、これら入水管１０５または出湯管１０６のいずれか一方に循環ポンプ１０７が設けられ（図示例では入水管１０５側に設けられている）、貯湯タンク１０２の焚き上げ時にこの循環ポンプ１０７を駆動させることによって、貯湯タンク１０２とヒートポンプユニット１０１との間で湯水の強制循環ができるように構成されている。   In the heat exchanger 133 of the heat pump unit 101, a water pipe 105 connected to the city water supply and the tank lower part of the hot water storage tank 102 and hot water heated by the heat exchanger 133 are heated and stored in the hot water storage tank 102. And a circulating pump 107 is provided in either one of the water inlet pipe 105 or the hot water outlet pipe 106 (provided on the side of the water inlet pipe 105 in the illustrated example). By driving this circulation pump 107 when the tank 102 is lifted, the hot water is forcibly circulated between the hot water storage tank 102 and the heat pump unit 101.

一方、貯湯タンク１０２は、密閉構造のタンクであって、タンク上部に上記ヒートポンプユニット１０１で加熱昇温された温水をタンク内に取り込むための温水入口Ｅと、一般給湯用の温水を取り出すための温水取出口Ｆと、暖房熱媒加熱用の液々熱交換器１０３の熱源となる温水を取り出すための温水取出口Ｇとが設けられている。   On the other hand, the hot water storage tank 102 is a hermetically sealed tank, and has a hot water inlet E for taking hot water heated by the heat pump unit 101 into the tank and taking out hot water for general hot water supply. A hot water outlet F and a hot water outlet G for taking out hot water as a heat source of the liquid heat exchanger 103 for heating the heating medium are provided.

そして、上記温水入口Ｅには上記出湯管１０６が、上記温水取出口Ｆには図示しない給湯栓と接続された給湯配管１０８が接続されるとともに、上記温水取出口Ｇには液々熱交換器１０３と連通する温水往き配管１０９が接続されている（詳細は後述する）。   The hot water inlet E is connected to the hot water outlet pipe 106, the hot water outlet F is connected to a hot water supply pipe 108 connected to a hot water tap (not shown), and the hot water outlet G is connected to a liquid heat exchanger. A hot water going-out pipe 109 communicating with 103 is connected (details will be described later).

また、タンク下部には水出入口Ｈが設けられ、この水出入口Ｈと上記入水管１０５の間にはこれらを連通させる下部配管１１０が配設されるとともに、この下部配管１１０には水量センサ１１１が設けられている。   In addition, a water inlet / outlet H is provided at the lower part of the tank, and a lower pipe 110 is provided between the water inlet / outlet H and the water inlet pipe 105, and a water amount sensor 111 is provided in the lower pipe 110. Is provided.

そして、本実施形態では、この貯湯タンク１０２には、液々熱交換器１０３からの戻り温水を貯湯タンク１０２に回収するための温水回収口Ｉが高さ方向の位置を異ならせて複数開設されている。具体的には、図示の給湯システムでは、この温水回収口Ｉとして、貯湯タンク１０２の側面に２箇所の温水回収口Ｉａ，Ｉｂが設けられている。   In this embodiment, the hot water storage tank 102 is provided with a plurality of hot water recovery ports I for recovering the hot water returned from the liquid heat exchanger 103 to the hot water storage tank 102 at different positions in the height direction. ing. Specifically, in the illustrated hot water supply system, as the hot water recovery port I, two hot water recovery ports Ia and Ib are provided on the side surface of the hot water storage tank 102.

これら温水回収口Ｉａ，Ｉｂは、貯湯タンク１０２においていわゆる中温水（具体的には、２０℃乃至６０℃程度の温水）が溜まりやすい高さ位置、すなわちタンクの中ほどに開設される。本実施形態では、上方の温水回収口Ｉａは、タンクの中間よりやや上方（具体的には、タンク全長に対して２／３程度の高さ位置）に開設され、下方の温水回収口Ｉｂは、タンクの下方（具体的には、タンク全長に対して１／３程度の高さ位置）に開設されている。   These hot water recovery ports Ia and Ib are opened at a height position where so-called medium-temperature water (specifically, hot water of about 20 ° C. to 60 ° C.) tends to accumulate in the hot water storage tank 102, that is, in the middle of the tank. In the present embodiment, the upper hot water recovery port Ia is opened slightly above the middle of the tank (specifically, at a height of about 2/3 of the entire tank length), and the lower hot water recovery port Ib is The tank is opened below the tank (specifically, at a height of about 1/3 of the total length of the tank).

また、この貯湯タンク１０２の各部にはタンク内の温水の温度（温度分布）を検出するための温度センサ１２０が複数配置される。具体的には、上記温水取出口Ｇの近傍に１２０ａ、上記温水回収口Ｉａ，Ｉｂの近傍にそれぞれ１２０ｂ、１２０ｃ、水出入口Ｈの近傍に１２０ｄで示す温度センサ１２０が配設されている。なお、これらの各温度センサ１２０の検出値は温度情報として上記コントローラ１０４に与えられる。   In addition, a plurality of temperature sensors 120 for detecting the temperature (temperature distribution) of the hot water in the tank are disposed in each part of the hot water storage tank 102. Specifically, a temperature sensor 120 indicated by 120a in the vicinity of the hot water outlet G, 120b and 120c in the vicinity of the hot water recovery ports Ia and Ib, and 120d in the vicinity of the water inlet / outlet H are provided. The detection values of each of these temperature sensors 120 are given to the controller 104 as temperature information.

そこで次に、上記貯湯タンク１０２と液々熱交換器１０３との接続について詳しく説明する。   Next, the connection between the hot water storage tank 102 and the liquid-liquid heat exchanger 103 will be described in detail.

すなわち、上記温水往き配管１０９は、２系統の温水取込口ａ，ｂと１の温水出口ｃとを有する第一の流路切替弁１１２の一方の温水取込口ａに接続される。この第一の流路切替弁１１２は、コントローラ１０４の制御により、温水取込口ａ，ｂの切替が可能に構成された弁装置であって、その温水出口ｃが暖房熱媒加熱用の循環ポンプ１１３を介して配管１１４により上記液々熱交換器１０３の一次側の温水入り側に接続されている。   That is, the warm water outlet pipe 109 is connected to one hot water intake port a of the first flow path switching valve 112 having two systems of hot water intake ports a and b and one hot water outlet c. The first flow path switching valve 112 is a valve device configured to be able to switch between the hot water intake ports a and b under the control of the controller 104, and the hot water outlet c is a circulation for heating the heating medium. The pipe 114 is connected to the primary hot water containing side of the liquid heat exchanger 103 via a pipe 113.

そして、液々熱交換器１０３の一次側の温水出側は、配管１１５を介して１の温水入口ｄと２系統の温水吐出口ｅ，ｆとを備えた第二の流路切替弁１１６の温水入口ｄと接続される。この第二の流路切替弁１１６も上述した第一の流路切替弁１１２と同様に、コントローラ１０４の制御によって温水吐出口ｅ，ｆの切替が可能に構成された弁装置で構成されている。   The primary hot water outlet side of the liquid-to-liquid heat exchanger 103 is connected to a second flow path switching valve 116 having one hot water inlet d and two hot water outlets e and f via a pipe 115. Connected to hot water inlet d. Similarly to the first flow path switching valve 112 described above, the second flow path switching valve 116 is also configured by a valve device configured to be able to switch the hot water discharge ports e and f under the control of the controller 104. .

そして、上記吐出口の一方（吐出口ｅ）が、上記第一の流路切替弁１１２の他方の温水取込口ｂと配管１１７により接続されている。この第一の流路切替弁１１２と第二の流路切替弁１１６とを接続する配管１１７には、その途中に分岐配管１１８が設けられており、この分岐配管１１８が上記貯湯タンク１０２に設けられた二つの温水回収口Ｉのうちの上方の温水回収口Ｉａに接続される。また、上記吐出口の他方（吐出口ｆ）は、配管１１９を介して下方の温水回収口Ｉｂと接続される。   One of the discharge ports (discharge port e) is connected to the other hot water intake port b of the first flow path switching valve 112 by a pipe 117. A branch pipe 118 is provided in the middle of the pipe 117 connecting the first flow path switching valve 112 and the second flow path switching valve 116, and the branch pipe 118 is provided in the hot water storage tank 102. Of the two hot water recovery ports I, the upper hot water recovery port Ia is connected. The other of the discharge ports (discharge port f) is connected to the lower hot water recovery port Ib via a pipe 119.

液々熱交換器１０３は、温水暖房用の熱媒を加熱するための熱交換器であって、一次側に供給される温水を熱源として二次側を流れる暖房用の熱媒を加熱昇温させる。   The liquid-liquid heat exchanger 103 is a heat exchanger for heating a heating medium for hot water heating, and heats the heating heating medium flowing on the secondary side by using hot water supplied to the primary side as a heat source. Let

なお、液々熱交換器１０３の二次側には、暖房用のヘッダ１２１と接続された暖房往き配管１２２と暖房戻り配管１２３とが接続され、このヘッダ１２１に個々の温水暖房器具（図示例では、浴室乾燥機１２４と床暖房パネル１２５）が配管接続され、暖房用の循環ポンプ１２６により、これら温水暖房器具１２４，１２５と液々熱交換器１０３の二次側との間で熱媒の強制循環ができるように構成される。   The secondary side of the liquid heat exchanger 103 is connected to a heating forward pipe 122 and a heating return pipe 123 connected to the heating header 121, and individual hot water heaters (illustrated examples) are connected to the header 121. Then, the bathroom dryer 124 and the floor heating panel 125) are connected by piping, and a heating medium circulating between the hot water heaters 124 and 125 and the secondary side of the liquid heat exchanger 103 is connected by a heating circulation pump 126. It is configured to allow forced circulation.

コントローラ１０４は、このシステム全体の制御を行う制御装置であって、所定の制御プログラムを搭載したマイクロコンピュータを主要部として備えている。より詳細には、このコントローラ１０４は、所定の操作部を備えた操作装置（リモコン）１２７を有しており、このリモコン１２７で入力される操作情報や上記タンク温度センサ１２０ａ〜１２０ｄから入力される温度情報に基づいて上記第一及び第二の流路切替弁１１２，１１６を制御する他、ヒートポンプユニット１０１の運転／停止などの動作制御を行う（詳細は後述する）。   The controller 104 is a control device that controls the entire system, and includes a microcomputer having a predetermined control program as a main part. More specifically, the controller 104 includes an operation device (remote controller) 127 having a predetermined operation unit. Operation information input from the remote controller 127 and input from the tank temperature sensors 120a to 120d. In addition to controlling the first and second flow path switching valves 112 and 116 based on the temperature information, operation control such as operation / stop of the heat pump unit 101 is performed (details will be described later).

次に、このように構成された本実施形態の給湯システムの動作について説明する。
Ｃ：暖房運転について
本実施形態に示す給湯システムでは、上記リモコン１２７において暖房運転の開始を指示する操作が行われると、当該操作を受け付けたコントローラ１０４は、上記第一の流路切替弁１１２の流路をａ−ｃ（ｂは全閉）、上記第二の流路切替弁１１６の流路をｄ−ｆ（ｅは全閉）に設定し、この状態で循環ポンプ１１３を駆動させる。 Next, operation | movement of the hot water supply system of this embodiment comprised in this way is demonstrated.
C: Heating Operation In the hot water supply system shown in the present embodiment, when an operation for instructing the start of the heating operation is performed with the remote controller 127, the controller 104 that has received the operation performs the operation of the first flow path switching valve 112. The flow path is set to ac (b is fully closed), the flow path of the second flow path switching valve 116 is set to df (e is fully closed), and the circulation pump 113 is driven in this state.

これにより、暖房運転が開始された当初、すなわち暖房運転の初期段階においては、貯湯タンク１０２の上部に貯えられている高温の温水（たとえば、８０℃の温水）が温水取出口Ｇから温水往き配管１０９、第一の流路切替弁１１２を介して液々熱交換器１０３の一次側に供給され、二次側を流れる熱媒の加熱昇温が開始される。   Thereby, at the beginning of the heating operation, that is, at the initial stage of the heating operation, hot hot water (for example, 80 ° C. hot water) stored in the upper part of the hot water storage tank 102 is supplied from the hot water outlet G to the hot water outlet pipe. 109, the heating temperature of the heat medium supplied to the primary side of the liquid-to-liquid heat exchanger 103 via the first flow path switching valve 112 and flowing on the secondary side is started.

ところで、このような暖房運転の初期段階においては、液々熱交換器１０３の二次側を流れる暖房用の熱媒の温度は十分に上昇していないことから、貯湯タンク１０２から液々熱交換器１０３に供給される温水は液々熱交換器１０３で多くの熱を放熱することとなり、戻り温水の温度は著しく低下する。そのため、コントローラ１０４は、暖房運転の初期段階では、このような低温の戻り温水がタンク上部に貯えられている高温の温水と混ざらないように、上記第二の流路切替弁１１６の流路をｄ−ｆ（ｅは全閉）に設定し、低温の戻り温水を温水回収口Ｉｂからタンクの下部に戻すようにしている。   By the way, in such an initial stage of the heating operation, the temperature of the heating heat medium flowing on the secondary side of the liquid heat exchanger 103 is not sufficiently increased, so that the liquid heat exchange from the hot water storage tank 102 is performed. The hot water supplied to the vessel 103 dissipates a lot of heat in the liquid-to-liquid heat exchanger 103, and the temperature of the return hot water is significantly reduced. Therefore, in the initial stage of the heating operation, the controller 104 sets the flow path of the second flow path switching valve 116 so that the low temperature return warm water is not mixed with the high temperature warm water stored in the upper part of the tank. df (e is fully closed) is set so that the low temperature return warm water is returned from the warm water recovery port Ib to the lower part of the tank.

そして、暖房運転が開始されて暫くすると、液々熱交換器１０３の二次側を流れる暖房用の熱媒の温度が上昇し、液々熱交換器１０３の熱負荷が減少し、液々熱交換器１０３からの戻り温水の温度が上昇する。そのため、コントローラ１０４は、次の段階として、このような戻り温水の温度上昇に伴って上記第二の流路切替弁１１６の流路をｄ−ｆ，ｄ−ｅの双方に設定（ｅ，ｆともに全開）して、第二の流路切替弁１１６の２系統の流路を双方ともに開く。   After a while after the heating operation is started, the temperature of the heating heat medium flowing on the secondary side of the liquid-liquid heat exchanger 103 rises, the heat load of the liquid-liquid heat exchanger 103 decreases, and the liquid heat The temperature of the return warm water from the exchanger 103 rises. Therefore, as the next step, the controller 104 sets the flow path of the second flow path switching valve 116 to both df and de (e, f) as the temperature of the return hot water increases. Both are fully opened), and both the two channels of the second channel switching valve 116 are opened.

これにより、液々熱交換器１０３からの戻り温水は、上記温水回収口Ｉａ，Ｉｂの双方から貯湯タンク１０２に戻る。つまり、戻り温水の温度が上昇したことにより、戻り温水の全てをタンク下部に戻すとタンク下部にある低温の温水の温度が上昇して、焚き上げ時のヒートポンプユニット１０１の運転効率を低下させるので、コントローラ１０４は、第二の段階として、そのような運転効率の低下を防止するため、タンク下部に戻る戻り温水が少なくなるようにしている。   Thereby, the return hot water from the liquid heat exchanger 103 returns to the hot water storage tank 102 from both the hot water recovery ports Ia and Ib. In other words, since the temperature of the return warm water has risen, if all the return warm water is returned to the lower part of the tank, the temperature of the low temperature warm water at the lower part of the tank will rise, reducing the operating efficiency of the heat pump unit 101 at the time of firing. In the second stage, the controller 104 is configured to reduce the amount of warm water returning to the lower part of the tank in order to prevent such a decrease in operating efficiency.

ここで、これら第一および第二の流路切替弁１１２，１１６の流路切替のタイミングについては、たとえば、温水戻り配管１１５内に戻り温水の温度を検出する温度センサ（図示せず）を配置しておき、この温度センサの検出結果に基づいてコントローラ１０４が判断（具体的には、上記戻り温水が所定の温度に達したか否かを判断）するように構成することができる他、リモコン１２７での暖房運転開始操作からの経過時間をコントローラに計測させ、所定時間の経過によって切り替えるように構成することも可能である。   Here, regarding the timing of switching the flow paths of the first and second flow path switching valves 112 and 116, for example, a temperature sensor (not shown) for detecting the temperature of the return hot water is arranged in the hot water return pipe 115. In addition, the controller 104 can be configured to determine (specifically, determine whether or not the return hot water has reached a predetermined temperature) based on the detection result of the temperature sensor. It is also possible to configure the controller to measure the elapsed time from the heating operation start operation at 127 and to switch with the passage of a predetermined time.

また、上述した例では、この第二の段階として、第二の流路切替弁１１６のｄ，ｅ双方ともに全開とした場合を示したが、上述した実施形態１に示したように、戻り温水の温度と貯湯タンク１０２内の温度分布とに基づいて所定の分配比率で温水回収口Ｉａ，Ｉｂから戻り温水を回収させるように構成することもできる。すなわち、本実施形態の給湯システムにおいても、ｄ，ｅ各弁の開度を調節したり、ｄ，ｅ各弁の開時間を調節したりすることによって、温水回収口Ｉａ，Ｉｂへの分配比率を設定することが可能である。   In the above-described example, as the second stage, the case where both d and e of the second flow path switching valve 116 are fully opened is shown. However, as shown in the first embodiment, the return hot water Based on the temperature of the hot water storage tank 102 and the temperature distribution in the hot water storage tank 102, the hot water can be recovered from the hot water recovery ports Ia and Ib at a predetermined distribution ratio. That is, also in the hot water supply system of the present embodiment, the distribution ratio to the hot water recovery ports Ia and Ib is adjusted by adjusting the opening degree of each of the valves d and e and adjusting the opening time of the valves d and e. Can be set.

そして、暖房運転が継続されることにより、液々熱交換器１０３の熱負荷がさらに減少すると、コントローラ１０４は、次の段階として、上記第一の流路切替弁１１２の流路をｂ−ｃ（ａは全閉）に設定するとともに。上記第二の流路切替弁１１６の流路をｄ−ｆ（ｅは全閉）に設定する。   When the heating operation is continued and the heat load of the liquid heat exchanger 103 is further reduced, the controller 104 sets the flow path of the first flow path switching valve 112 to bc as the next stage. (A is fully closed) The flow path of the second flow path switching valve 116 is set to df (e is fully closed).

すなわち、暖房運転開始からある程度時間が経過して暖房回路側がいわゆる平衡状態になると、コントローラ１０４は貯湯タンク１０２の上部から高温の温水を取り出すのを止めて貯湯タンク１０２の中ほどにたまっている中温水を暖房熱媒加熱用の熱源として使用する。換言すれば、この段階では、温水回収口Ｉａを液々熱交換器１０３への温水の取出口として用いる。そしてその一方で、液々熱交換器１０３に供給する温水の温度が下がることに伴って戻り温水の温度も下がるので、戻り温水をタンク下部に戻すようにしている。   That is, when a certain amount of time has elapsed from the start of the heating operation and the heating circuit side is in a so-called equilibrium state, the controller 104 stops taking out hot hot water from the upper part of the hot water storage tank 102 and accumulates in the middle of the hot water storage tank 102. Hot water is used as a heat source for heating medium heating. In other words, at this stage, the hot water recovery port Ia is used as a hot water outlet to the liquid-liquid heat exchanger 103. On the other hand, since the temperature of the return warm water decreases as the temperature of the warm water supplied to the liquid heat exchanger 103 decreases, the return warm water is returned to the lower part of the tank.

なお、ここで暖房回路が平衡状態になったか否かの判断も、上述したのと同様に、温水戻り配管１１５内に戻り温水の温度を検出する温度センサ（図示せず）を配置しておき、この温度センサの検出結果に基づいてコントローラ１０４が判断（より具体的には、戻り温水の温度の経時変化が少なくなると暖房回路は平衡状態にあると判断）するように構成できる他、リモコン１２７での暖房運転開始操作からの経過時間をコントローラに計測させ、所定時間の経過によって平衡状態にあると判断することも可能である。   It should be noted that a temperature sensor (not shown) for detecting the temperature of the return hot water is arranged in the hot water return pipe 115 in the same manner as described above to determine whether or not the heating circuit is in an equilibrium state. In addition, the controller 104 can be configured to make a determination based on the detection result of the temperature sensor (more specifically, the heating circuit is determined to be in an equilibrium state when the change in the temperature of the return hot water decreases). It is also possible to cause the controller to measure the elapsed time from the heating operation start operation in and to determine that the vehicle is in an equilibrium state after a predetermined time.

そして、さらに液々熱交換器１０３の熱負荷が減少すると、最後の段階として、コントローラ１０４は、上記第二の流路切替弁１１６の流路をｄ−ｅ（ｆは全閉）に設定する。つまり、この最後の段階では、液々熱交換器１０３による熱負荷が極めて小さく、熱交換器による放熱が殆どないので、液々熱交換器１０３からの戻り温水を第二、第一の流路切替弁１１６，１１２を経由して再び液々熱交換器１０３に戻すようにしている。つまり、この場合、上記温水回収口Ｉａは温水の取出しも回収も行わずに、戻り温水は、第一の流路切替弁１１２に流れ、第一の流路切替弁１１２、液々熱交換器１０３、第二の流路切替弁１１６の間で循環する。   When the heat load of the liquid heat exchanger 103 further decreases, as a final step, the controller 104 sets the flow path of the second flow path switching valve 116 to de (f is fully closed). . That is, in this last stage, since the heat load by the liquid heat exchanger 103 is extremely small and there is almost no heat radiation by the heat exchanger, the return hot water from the liquid heat exchanger 103 is supplied to the second and first flow paths. The liquid is again returned to the liquid heat exchanger 103 via the switching valves 116 and 112. That is, in this case, the warm water recovery port Ia does not take out or collect the warm water, and the return warm water flows to the first flow path switching valve 112, and the first flow path switching valve 112, the liquid-liquid heat exchanger 103 circulates between the second flow path switching valve 116.

このように、本実施形態に示す給湯システムでは、液々熱交換器１０３の二次側に接続される負荷の使用状況や液々熱交換器１０３からの戻り温水の温度等に応じて第一および第二の流路切替弁１１２，１１６の流路を切り替えるように構成されているので、貯湯タンク１０２にある中温水が積極的に利用できるとともに、戻り温水による温度成層の破壊が少ないので、高温出湯に対応可能で、しかもヒートポンプユニット１０１の運転効率の低下の少ない給湯システムを提供できる。   As described above, in the hot water supply system shown in the present embodiment, the first condition depends on the usage state of the load connected to the secondary side of the liquid-liquid heat exchanger 103, the temperature of the return hot water from the liquid-liquid heat exchanger 103, and the like. And the second flow path switching valves 112 and 116 are configured to switch the flow path, so that the medium-temperature water in the hot water storage tank 102 can be actively used, and there is little destruction of temperature stratification due to the return hot water, It is possible to provide a hot water supply system that can cope with high-temperature hot water discharge and that is less likely to reduce the operation efficiency of the heat pump unit 101.

Ｄ：一般給湯について
本実施形態の給湯システムでは、一般給湯用の温水取出口Ｆは貯湯タンク１０２の上部に設けられ、この取出口Ｆに給湯配管１０８が接続されているので、給湯配管１０８には常に高温の温水が供給可能とされている。したがって、この給湯配管１０８の先端に混合水栓等の給湯栓を設けておけば、所望の温度での出湯が可能とされる。 D: General Hot Water Supply In the hot water supply system of the present embodiment, the hot water outlet F for general hot water is provided at the upper part of the hot water storage tank 102, and the hot water supply pipe 108 is connected to the outlet F. Is always capable of supplying hot water. Therefore, if a hot-water tap such as a mixed water tap is provided at the tip of the hot-water supply pipe 108, hot water can be discharged at a desired temperature.

なお、上述した実施形態は本発明の好適な実施態様を示すものであって、本発明はこれらに限定されることなくその範囲内で種々の設計変更が可能である。   In addition, embodiment mentioned above shows the preferred embodiment of this invention, Comprising: This invention is not limited to these, A various design change is possible within the range.

たとえば、上述した実施形態では、給湯システムの熱源として、自然冷媒を用いたヒートポンプユニットを用いた場合を示したが、本発明は、熱源で加熱昇温された温水を貯湯タンクに貯湯するタイプの給湯システムであれば、熱源として他の冷媒を用いたヒートポンプユニットやコージェネレーション等を用いることも可能である。   For example, in the above-described embodiment, a case where a heat pump unit using a natural refrigerant is used as a heat source of a hot water supply system is shown. However, the present invention is a type of storing hot water heated by a heat source and heated in a hot water storage tank. If it is a hot water supply system, it is also possible to use a heat pump unit, cogeneration, etc. using other refrigerants as a heat source.

また、上述した実施形態１では、タンク下部の温水回収口Ｄを、水出入口Ｃと兼用するように設けた場合を示したが、もちろん水出入口Ｃとは別に温水回収口Ｄを設けることも可能である。また、貯湯タンク２に設けられる温水回収口Ｄは、高さ方向の位置を異ならせて複数設けられていればよく、図示例のように４箇所限定されるものではない。   In the first embodiment described above, the case where the hot water recovery port D in the lower part of the tank is provided so as to be used also as the water inlet / outlet C is shown. Of course, the hot water recovery port D can be provided separately from the water inlet / outlet C. It is. Moreover, the hot water collection | recovery port D provided in the hot water storage tank 2 should just be provided with two or more positions in the height direction, and is not limited to four places like the example of illustration.

なお、上述した実施形態２は、液々熱交換器１０３の負荷として温水暖房器具を用いた場合を示したが、液々熱交換器１０３の負荷としては、実施形態１に示すような風呂追い焚き回路を用いることも可能である。その場合、通常の風呂追い焚きを行うときは、貯湯タンク１０２の上部にある温水取出口Ｇから取り出した温水を液々熱交換器１０３に供給する。そして、たとえば、入浴者に不快感を与えないように緩やかな追い焚きをするような場合には、上記第一および第二の流路切替弁１１２，１１６の流路を切り替えて温水回収口Ｉａからの温水を利用して液々熱交換器１０３を加熱する。つまり、この場合、第一の流路切替弁１１２の流路をｂ−ｃとし、第二の流路切替弁１１６の流路をｄ−ｆとして追い焚きを行う。   In addition, although Embodiment 2 mentioned above showed the case where a hot-water heating appliance was used as a load of the liquid-liquid heat exchanger 103, the bath follower as shown in Embodiment 1 is used as the load of the liquid-liquid heat exchanger 103. It is also possible to use a whisper circuit. In that case, when performing normal bath replenishment, the hot water taken out from the hot water outlet G at the top of the hot water storage tank 102 is supplied to the liquid heat exchanger 103. For example, in the case of slowly chasing the bather without discomfort, the hot water recovery port Ia is switched by switching the flow paths of the first and second flow path switching valves 112 and 116. The liquid heat exchanger 103 is heated using the hot water from. That is, in this case, the flow path of the first flow path switching valve 112 is set to bc, and the flow path of the second flow path switching valve 116 is set to be df.

本発明に係る給湯システムの一例を示す概略構成図である。It is a schematic structure figure showing an example of a hot-water supply system concerning the present invention. 同給湯システムにおける戻り温水の回収手順を説明するための説明図である。It is explanatory drawing for demonstrating the collection | recovery procedure of the return warm water in the hot-water supply system. 同給湯システムにおける液々熱交換器の二次側の改変例を示す概略構成図である。It is a schematic block diagram which shows the modification of the secondary side of the liquid-liquid heat exchanger in the hot-water supply system. 同給湯システムの第二の実施形態を示す概略構成図である。It is a schematic block diagram which shows 2nd embodiment of the hot water supply system.

符号の説明Explanation of symbols

１，１０１ ヒートポンプユニット
２，１０２ 貯湯タンク
３，１０３ 液々熱交換器
４ 混合ヘッダ
５，１０４ コントローラ
１１ａ〜１１ｄ ヘッダ配管
１２ａ〜１２ｄ 流量調整弁
１３ａ〜１３ｄ 温度センサ
２７，１２７ リモコン
１１２ 第一の流路切替弁
１１６ 第二の流路切替弁
Ａ，Ｅ 温水入口
Ｂ，Ｆ，Ｇ 温水取出口
Ｃ，Ｈ 水出入口
Ｄ，Ｉ 温水回収口 DESCRIPTION OF SYMBOLS 1,101 Heat pump unit 2,102 Hot water storage tank 3,103 Liquid heat exchanger 4 Mixing header 5,104 Controller 11a-11d Header piping 12a-12d Flow control valve 13a-13d Temperature sensor 27,127 Remote control 112 First flow Channel switching valve 116 Second channel switching valve A, E Hot water inlet B, F, G Hot water outlet C, H Water outlet D, I Hot water recovery port

Claims (5)

ヒートポンプユニットで加熱昇温された温水を貯湯タンクに貯湯するタイプの給湯システムであって、前記貯湯タンクに液々熱交換器に温水を供給するための温水往き配管を有するものにおいて、前記液々熱交換器からの戻り温水を前記貯湯タンクに回収する方法であって、
前記貯湯タンクに、高さ方向の位置を異ならせて複数の温水回収口を設けておき、
前記液々熱交換器からの戻り温水を前記貯湯タンクに戻すに際して、前記戻り温水の温度と前記貯湯タンク内の温水の温度分布とをそれぞれ検出し、
この検出した戻り温水の温度と貯湯タンク内の温水の温度分布とに応じて、前記戻り温水を複数の温水回収口に分配して戻すことを特徴とする戻り温水の回収方法。 A hot water supply system for storing hot water heated by a heat pump unit in a hot water storage tank, wherein the hot water storage tank has hot water outlet piping for supplying hot water to a liquid heat exchanger. A method for recovering the hot water returned from the heat exchanger to the hot water storage tank,
In the hot water storage tank, a plurality of hot water recovery ports are provided at different positions in the height direction,
When returning the return hot water from the liquid heat exchanger to the hot water storage tank, the temperature of the return hot water and the temperature distribution of the hot water in the hot water storage tank are respectively detected.
A return hot water recovery method, wherein the return hot water is distributed and returned to a plurality of hot water recovery ports according to the detected temperature of the return hot water and the temperature distribution of the hot water in the hot water storage tank. 前記戻り温水の分配は、前記貯湯タンク内で前記戻り温水の温度に最も近い高低両側の温度成層に所定の分配比率で分配するように設定されることを特徴とする請求項１に記載の戻り温水の回収方法。   The return hot water is distributed so as to be distributed at a predetermined distribution ratio to temperature stratifications on both sides of the hot and cold water closest to the temperature of the return hot water in the hot water storage tank. Hot water recovery method. ヒートポンプユニットで加熱昇温された温水を貯湯タンクに貯湯するタイプの給湯システムであって、前記貯湯タンクに液々熱交換器に温水を供給するための温水往き配管を有するものにおいて、
前記貯湯タンクに、一般給湯用の温水取出口を兼ねた温水回収口が高さ方向の位置を異ならせて複数設けられ、
これら各温水回収口が流量調整弁を備えたヘッダ配管を介してそれぞれ混合ヘッダに接続されるとともに、前記液々熱交換器からの温水戻り配管が流量調整弁を介して前記混合ヘッダに接続され、
前記各温水回収口の近傍にそれぞれ貯湯タンク内の温水の温度を検出するタンク温度センサが配設されるとともに、前記温水戻り配管にも前記戻り温水の温度を検出する戻り温度センサが設けられ、
前記液々熱交換器からの戻り温水を貯湯タンクに戻すに際して、制御手段が、前記戻り温度センサとタンク温度センサとによって検出される戻り温水の温度と貯湯タンク内の温水の温度分布とに応じて前記戻り温水が複数の温水回収口を通じて貯湯タンクに回収されるように前記流量調整弁を制御する制御構成を備えていることを特徴とする給湯システム。 A hot water supply system that stores hot water heated by a heat pump unit in a hot water storage tank, and has a hot water supply pipe for supplying hot water to the liquid heat exchanger in the hot water storage tank.
In the hot water storage tank, a plurality of hot water recovery ports serving as hot water outlets for general hot water supply are provided with different positions in the height direction,
Each of these hot water recovery ports is connected to the mixing header via a header pipe provided with a flow rate adjustment valve, and a hot water return pipe from the liquid heat exchanger is connected to the mixing header via a flow rate adjustment valve. ,
A tank temperature sensor for detecting the temperature of the hot water in the hot water storage tank is provided in the vicinity of each hot water recovery port, and a return temperature sensor for detecting the temperature of the return hot water is also provided in the hot water return pipe.
When returning the return hot water from the liquid heat exchanger to the hot water storage tank, the control means responds to the temperature of the return hot water detected by the return temperature sensor and the tank temperature sensor and the temperature distribution of the hot water in the hot water storage tank. A hot water supply system comprising a control structure for controlling the flow rate adjustment valve so that the return hot water is recovered to the hot water storage tank through a plurality of hot water recovery ports. 前記液々熱交換器からの温水戻り配管に設けられる流量調整弁の上流側に前記貯湯タンクに直結されたバイパス配管が設けられるとともに、このバイパス配管に該バイパス配管を流れる戻り温水の流量を調節するバイパス弁が設けられていることを特徴とする請求項３に記載の給湯システム。   A bypass pipe directly connected to the hot water storage tank is provided on the upstream side of the flow rate adjustment valve provided in the hot water return pipe from the liquid heat exchanger, and the flow rate of the return hot water flowing through the bypass pipe is adjusted to the bypass pipe. The hot water supply system according to claim 3, wherein a bypass valve is provided. ヒートポンプユニットで加熱昇温された温水を貯湯タンクに貯湯するタイプの給湯システムにおいて、前記貯湯タンクに液々熱交換器に温水を供給するための温水往き配管を有するものにおいて、
前記貯湯タンクに、高さ方向の位置を異ならせて２個の温水回収口が設けられ、
前記温水往き配管が、温水取込経路として２系統の温水取込口を有する第一の流路切替弁の一方の温水取込口に接続されるとともに、該第一の流路切替弁の温水出口が前記液々熱交換器と接続され、
前記液々熱交換器からの温水戻り配管が、２系統の温水吐出口を備えた第二の流路切替弁の温水入口に接続され、前記温水吐出口の一方が前記第一の流路切替弁の他方の温水取込口と前記貯湯タンクの一方の温水回収口に接続されるとともに、前記温水吐出口の他方が前記貯湯タンクの他方の温水回収口と接続されていることを特徴とする給湯システム。 In a hot water supply system that stores hot water heated by a heat pump unit in a hot water storage tank, the hot water storage tank has a hot water outlet pipe for supplying hot water to a liquid heat exchanger.
The hot water storage tank is provided with two hot water recovery ports at different height positions,
The hot water outlet pipe is connected to one hot water intake port of a first flow path switching valve having two hot water intake ports as a hot water intake path, and the hot water of the first flow path switching valve The outlet is connected to the liquid heat exchanger,
A hot water return pipe from the liquid heat exchanger is connected to a hot water inlet of a second flow path switching valve having two hot water discharge ports, and one of the hot water discharge ports is the first flow path switching The other hot water intake port of the valve is connected to one hot water recovery port of the hot water storage tank, and the other of the hot water discharge port is connected to the other hot water recovery port of the hot water storage tank. Hot water system.
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