JP6515859B2 - Hot water storage system - Google Patents

Hot water storage system Download PDF

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JP6515859B2
JP6515859B2 JP2016079012A JP2016079012A JP6515859B2 JP 6515859 B2 JP6515859 B2 JP 6515859B2 JP 2016079012 A JP2016079012 A JP 2016079012A JP 2016079012 A JP2016079012 A JP 2016079012A JP 6515859 B2 JP6515859 B2 JP 6515859B2
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hot water
temperature
water supply
flow path
warm water
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JP2017190884A (en
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史人 竹内
史人 竹内
真行 須藤
真行 須藤
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Mitsubishi Electric Corp
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Description

本発明は、貯湯式給湯システムに関する。   The present invention relates to a hot water storage type hot water supply system.

下記特許文献１には、以下のような貯湯式給湯システムが開示されている。第１混合弁（２２）及び第２混合弁（２９）を備える。第１混合弁（２２）は、貯湯タンク（２）の上部に接続された出湯管（７）からの湯水と給水バイパス管（２３）からの湯水とを混合する。第２混合弁（２９）は、給水バイパス管（２３）の途中に設けられる。第２混合弁（２９）は、給水バイパス管（２３）を流れる湯水に中間出湯管（２７）からの湯水を混合する。   The following hot water storage type hot water supply system is disclosed by the following patent document 1. A first mixing valve (22) and a second mixing valve (29) are provided. The first mixing valve (22) mixes the hot water from the hot water outlet pipe (7) connected to the upper part of the hot water storage tank (2) with the hot water from the water supply bypass pipe (23). The second mixing valve (29) is provided in the middle of the water supply bypass pipe (23). The second mixing valve (29) mixes the hot water from the intermediate outlet pipe (27) with the hot water flowing through the water supply bypass pipe (23).

中間温度センサ（２８）の検出温度が、給湯設定温度より一定温度（例えば５℃）高い温度より高い場合は、第２混合弁（２９）で中間出湯管（２７）からの湯水と給水バイパス管（２３）からの水とを設定温度に混合して給湯する。このとき、第１混合弁（２２）では出湯管（７）側を全閉にする。   When the detected temperature of the intermediate temperature sensor (28) is higher than the temperature which is higher by a fixed temperature (for example 5 ° C.) than the hot water supply set temperature, the second mixing valve (29) causes the hot water from the intermediate outlet pipe (27) and the water supply bypass pipe The water from (23) is mixed to the set temperature and hot water is supplied. At this time, the outlet pipe (7) side of the first mixing valve (22) is fully closed.

中間温度センサ（２８）の検出温度が、給湯設定温度より一定温度（例えば５℃）低い温度より低い場合は、第２混合弁（２９）の中間出湯管（２７）側を全開にし、第１混合弁（２２）で出湯管（７）からの湯水を混合して給湯設定温度の湯を給湯する。   When the temperature detected by the intermediate temperature sensor (28) is lower than a temperature lower by a fixed temperature (for example, 5 ° C.) than the hot water supply set temperature, the intermediate discharge pipe (27) side of the second mixing valve (29) is fully opened. The hot water from the hot water discharge pipe (7) is mixed with the mixing valve (22) to supply hot water of the hot water setting temperature.

中間温度センサ（２８）の検出温度が、給湯設定温度より一定温度高い温度未満、かつ、給湯設定温度より一定温度低い温度以上のときは、第２混合弁（２９）で中間出湯管（２７）からの湯水と給水バイパス管（２３）からの水とを給湯設定温度より所定温度（例えば５℃）低い温度になるよう混合し、この混合された湯水に出湯管（７）からの湯水を混合して給湯設定温度の湯を給湯するように第１混合弁（２２）が制御される。   When the detected temperature of the intermediate temperature sensor (28) is lower than the fixed temperature higher than the hot water supply set temperature and not lower than the fixed temperature lower than the hot water supply set temperature, the intermediate mixing pipe (27) with the second mixing valve (29) The hot water from the water and the water from the water supply bypass pipe (23) are mixed so that the temperature is lower by a predetermined temperature (for example, 5 ° C.) than the hot water supply setting temperature, and the mixed hot water and the hot water from the hot water pipe (7) are mixed Then, the first mixing valve (22) is controlled to supply the hot water of the hot water supply set temperature.

特開２００４−１９７９５８号公報JP, 2004-197958, A

貯湯タンクの中間部は、湯水の放熱、貯湯タンク内の高温部と低温部との熱拡散等の影響により、温度変動が大きい。このため、貯湯タンクの中間部から取り出される中温水の温度は、急激な変動、例えば１秒間に５℃以上の変動、を生じることもある。   The middle part of the hot water storage tank has a large temperature fluctuation due to the heat radiation of hot water and the thermal diffusion between the high temperature part and the low temperature part in the hot water storage tank. For this reason, the temperature of the medium-temperature water taken out from the middle part of the hot water storage tank may cause a rapid fluctuation, for example, a fluctuation of 5 ° C. or more per second.

上述した特許文献１の技術では、以下のような場合に、給湯温度が大きく変動しやすい。中間温度センサ（２８）で検出される中温水の温度が、給湯設定温度より一定温度（例えば５℃）高い温度より高い場合は、第２混合弁（２９）で中温水と水源からの低温水とを設定温度に混合して給湯する。このとき、第１混合弁（２２）は出湯管（７）側が全閉になっている。中間出湯管（２７）からの中温水の温度が急低下した場合、給湯温度が急低下する。そのような給湯温度の急低下が検出されると、第１混合弁（２２）が出湯管（７）側を開くように、大きく作動する。その結果、給湯温度が急激に上昇し、オーバーシュートする可能性がある。   In the technology of Patent Document 1 described above, the hot water supply temperature is likely to fluctuate greatly in the following cases. If the temperature of middle warm water detected by the intermediate temperature sensor (28) is higher than a temperature higher by a fixed temperature (for example, 5 ° C.) than the hot water supply set temperature, low temperature water from the middle warm water and water source by the second mixing valve (29) And hot water by mixing to the set temperature. At this time, the side of the hot water discharge pipe (7) of the first mixing valve (22) is fully closed. When the temperature of the middle warm water from the intermediate tapping pipe (27) drops sharply, the hot water supply temperature drops sharply. When such a rapid drop in the temperature of the hot water supply is detected, the first mixing valve (22) operates largely to open the hot water outlet pipe (7) side. As a result, the hot water supply temperature may rise rapidly and may overshoot.

本発明は、上述のような課題を解決するためになされたもので、貯湯タンクの中温水を有効利用することと、給湯温度の変動を小さくすることとを両立できる貯湯式給湯システムを提供することを目的とする。   The present invention has been made to solve the problems as described above, and provides a hot water storage type hot water supply system capable of achieving both effective utilization of middle warm water of a hot water storage tank and reduction of fluctuation of hot water supply temperature. The purpose is

本発明に係る貯湯式給湯システムは、貯湯タンクと、貯湯タンクの上部に接続された高温配管と、高温配管の接続位置より低い位置で貯湯タンクに接続された中温配管と、高温配管から供給される高温水と、水源から供給される低温水または中温配管から供給される中温水とを混合することで、給湯先へ供給される湯を温度調節する少なくとも一つの混合手段と、中温水が少なくとも一つの混合手段へ供給される流路状態である中温水利用状態と、低温水が少なくとも一つの混合手段へ供給される流路状態である中温水非利用状態とを切り替える流路切替手段と、中温水の温度を検出する手段と、少なくとも一つの混合手段及び流路切替手段を制御する手段と、を備え、給湯設定温度より低い温度である第一基準温度に比べて中温水の温度が低い場合には、流路切替手段を中温水利用状態へ切り替え、給湯設定温度より低く第一基準温度より高い温度である第二基準温度に比べて中温水の温度が高い場合には、流路切替手段を中温水非利用状態へ切り替え、給湯先への給湯が停止中のときに流路切替手段の切り替えを許容し、給湯先への給湯が実行中のときには流路切替手段の切り替えを実施しないものである。
また、本発明に係る貯湯式給湯システムは、貯湯タンクと、貯湯タンクの上部に接続された高温配管と、高温配管の接続位置より低い位置で貯湯タンクに接続された中温配管と、高温配管から供給される高温水と、水源から供給される低温水または中温配管から供給される中温水とを混合することで、給湯先へ供給される湯を温度調節する少なくとも一つの混合手段と、中温水が少なくとも一つの混合手段へ供給される流路状態である中温水利用状態と、低温水が少なくとも一つの混合手段へ供給される流路状態である中温水非利用状態とを切り替える流路切替手段と、中温水の温度を検出する手段と、少なくとも一つの混合手段及び流路切替手段を制御する手段と、を備え、給湯設定温度より低い温度である第一基準温度に比べて中温水の温度が低い場合には、流路切替手段を中温水利用状態へ切り替え、給湯設定温度より低く第一基準温度より高い温度である第二基準温度に比べて中温水の温度が高い場合には、流路切替手段を中温水非利用状態へ切り替え、流路切替手段が中温水利用状態で給湯先への給湯が停止中のときの少なくとも一つの混合手段は、第一待機位置にあり、流路切替手段が中温水非利用状態で給湯先への給湯が停止中のときの少なくとも一つの混合手段は、第二待機位置にあり、第二待機位置は、第一待機位置に比べて、高温水の混合割合が高くなる位置であり、流路切替手段を中温水利用状態から中温水非利用状態へ切り替えた後に少なくとも一つの混合手段を第一待機位置から第二待機位置へ作動させるものである。
また、本発明に係る貯湯式給湯システムは、貯湯タンクと、貯湯タンクの上部に接続された高温配管と、高温配管の接続位置より低い位置で貯湯タンクに接続された中温配管と、高温配管から供給される高温水と、水源から供給される低温水または中温配管から供給される中温水とを混合することで、給湯先へ供給される湯を温度調節する少なくとも一つの混合手段と、中温水が少なくとも一つの混合手段へ供給される流路状態である中温水利用状態と、低温水が少なくとも一つの混合手段へ供給される流路状態である中温水非利用状態とを切り替える流路切替手段と、中温水の温度を検出する手段と、少なくとも一つの混合手段及び流路切替手段を制御する手段と、第一運転モードに比べてエネルギー効率の向上を優先する運転モードである第二運転モードをユーザーが設定可能にする手段と、を備え、給湯設定温度より低い温度である第一基準温度に比べて中温水の温度が低い場合には、流路切替手段を中温水利用状態へ切り替え、給湯設定温度より低く第一基準温度より高い温度である第二基準温度に比べて中温水の温度が高い場合には、流路切替手段を中温水非利用状態へ切り替え、第二運転モードが設定されている場合にはそうでない場合に比べて、第一基準温度及び第二基準温度の値を高くするものである。
また、本発明に係る貯湯式給湯システムは、貯湯タンクと、貯湯タンクの上部に接続された高温配管と、高温配管の接続位置より低い位置で貯湯タンクに接続された中温配管と、高温配管から供給される高温水と、水源から供給される低温水または中温配管から供給される中温水とを混合することで、給湯先へ供給される湯を温度調節する少なくとも一つの混合手段と、中温水が少なくとも一つの混合手段へ供給される流路状態である中温水利用状態と、低温水が少なくとも一つの混合手段へ供給される流路状態である中温水非利用状態とを切り替える流路切替手段と、中温水の温度を検出する手段と、少なくとも一つの混合手段及び流路切替手段を制御する手段と、を備え、給湯設定温度より低い温度である第一基準温度に比べて中温水の温度が低い場合には、流路切替手段を中温水利用状態へ切り替え、給湯設定温度より低く第一基準温度より高い温度である第二基準温度に比べて中温水の温度が高い場合には、流路切替手段を中温水非利用状態へ切り替え、貯湯タンク内から水を導出して貯湯タンク内に戻す回路の水を循環させる運転を実行するときには、流路切替手段を中温水非利用状態へ切り替えるものである。
The storage type hot water supply system according to the present invention is supplied from a storage hot water tank, high temperature piping connected to the top of the hot water storage tank, intermediate temperature piping connected to the hot water storage tank at a position lower than the connection position of the high temperature piping, and high temperature piping At least one mixing means for controlling the temperature of the hot water supplied to the hot water supply destination by mixing the high-temperature water with the low-temperature water supplied from the water source or the medium-temperature water supplied from the medium-temperature piping; Flow passage switching means for switching between the use condition of middle warm water which is a flow passage condition supplied to one mixing means and the use condition of middle warm water which is a flow passage condition of low temperature water being supplied to at least one mixing means; A means for detecting the temperature of the medium-temperature water and a means for controlling the at least one mixing means and the passage switching means, wherein the temperature of the medium-temperature water is lower than the first reference temperature which is a temperature lower than the hot water supply set temperature. If the temperature of middle warm water is higher than the second reference temperature which is lower than the hot water supply set temperature and higher than the first reference temperature, the flow passage switching means is switched to the middle warm water utilization state. Switch the switching means to the medium water non-use state, allow switching of the flow path switching means when the hot water supply to the hot water supply destination is stopped, and switch the flow path switching means when the hot water supply to the hot water supply destination is in progress It is not a thing.
In the storage type hot water supply system according to the present invention, the storage hot water tank, the high temperature piping connected to the upper portion of the hot water storage tank, the medium temperature piping connected to the hot water storage tank at a position lower than the connection position of the high temperature piping, and the high temperature piping At least one mixing means for controlling the temperature of the hot water supplied to the hot water supply destination by mixing the supplied high temperature water and the low temperature water supplied from the water source or the medium warm water supplied from the medium temperature piping, and the medium warm water A channel switching means for switching between the use condition of middle warm water, which is a flow passage condition supplied to at least one mixing unit, and the use condition of middle warm water, which is a flow passage condition where low temperature water is supplied to at least one mixing unit And means for detecting the temperature of the medium-temperature water and means for controlling the at least one mixing means and the passage switching means, and the medium-temperature water has a temperature lower than the hot water supply set temperature compared to the first reference temperature. If the degree is low, the flow path switching means is switched to the use condition of middle warm water, and if the temperature of middle warm water is higher than the second reference temperature which is lower than the hot water supply set temperature and higher than the first reference temperature, The at least one mixing means when the flow path switching means is switched to the middle warm water non-use state and the hot water supply to the hot water supply destination is stopped while the flow path switching means is the middle warm water use state is at the first standby position. At least one mixing means when the switching means is in the non-use condition and the hot water supply to the hot water supply destination is stopped is in the second standby position, and the second standby position is higher in temperature than the first standby position. And the at least one mixing means is operated from the first standby position to the second standby position after the flow path switching means is switched from the middle warm water utilization state to the middle warm water nonuse state. .
In the storage type hot water supply system according to the present invention, the storage hot water tank, the high temperature piping connected to the upper portion of the hot water storage tank, the medium temperature piping connected to the hot water storage tank at a position lower than the connection position of the high temperature piping, and the high temperature piping At least one mixing means for controlling the temperature of the hot water supplied to the hot water supply destination by mixing the supplied high temperature water and the low temperature water supplied from the water source or the medium warm water supplied from the medium temperature piping, and the medium warm water A channel switching means for switching between the use condition of middle warm water, which is a flow passage condition supplied to at least one mixing unit, and the use condition of middle warm water, which is a flow passage condition where low temperature water is supplied to at least one mixing unit And means for detecting the temperature of middle warm water, means for controlling at least one mixing means and flow path switching means, and an operation mode giving priority to improvement of energy efficiency as compared to the first operation mode. Means for enabling the user to set the second operation mode, and when the temperature of the medium temperature water is lower than the first reference temperature which is a temperature lower than the hot water supply set temperature, the passage switching means is used as the medium temperature water When the temperature of middle warm water is higher than the second reference temperature which is lower than the hot water supply set temperature and higher than the first reference temperature, the flow path switching unit is switched to the middle warm water non-use state. When the operation mode is set, the values of the first reference temperature and the second reference temperature are increased as compared with the case where the operation mode is not set.
In the storage type hot water supply system according to the present invention, the storage hot water tank, the high temperature piping connected to the upper portion of the hot water storage tank, the medium temperature piping connected to the hot water storage tank at a position lower than the connection position of the high temperature piping, and the high temperature piping At least one mixing means for controlling the temperature of the hot water supplied to the hot water supply destination by mixing the supplied high temperature water and the low temperature water supplied from the water source or the medium warm water supplied from the medium temperature piping, and the medium warm water A channel switching means for switching between the use condition of middle warm water, which is a flow passage condition supplied to at least one mixing unit, and the use condition of middle warm water, which is a flow passage condition where low temperature water is supplied to at least one mixing unit And means for detecting the temperature of the medium-temperature water and means for controlling the at least one mixing means and the passage switching means, and the medium-temperature water has a temperature lower than the hot water supply set temperature compared to the first reference temperature. If the degree is low, the flow path switching means is switched to the use condition of middle warm water, and if the temperature of middle warm water is higher than the second reference temperature which is lower than the hot water supply set temperature and higher than the first reference temperature, When the flow switching means is switched to the middle warm water non-use state, and the circuit of circulating the water of the circuit which returns water from inside the hot water storage tank and returns it to the hot water storage tank is executed, the flow path switching means to the middle warm water non-use state It is what changes.

本発明の貯湯式給湯システムによれば、貯湯タンクの中温水を有効利用することと、給湯温度の変動を小さくすることとを両立することが可能となる。   According to the storage type hot water supply system of the present invention, it is possible to make effective use of middle warm water of the hot water storage tank and to reduce fluctuation of the hot water supply temperature.

実施の形態１の貯湯式給湯システムを示す図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the hot water storage type hot-water supply system of Embodiment 1. FIG. 実施の形態１において実行されるルーチンのフローチャートである。5 is a flowchart of a routine executed in the first embodiment.

実施の形態１．
図１は、実施の形態１の貯湯式給湯システムを示す図である。図１に示す本実施の形態１の貯湯式給湯システム３５は、タンクユニット３３、ＨＰ（ヒートポンプ）ユニット７、及びリモコン４４を備える。ＨＰユニット７とタンクユニット３３との間は、ＨＰ往き配管１４とＨＰ戻り配管１５と図示しない電気配線とを介して接続されている。タンクユニット３３には、制御装置３６が内蔵されている。タンクユニット３３及びＨＰユニット７が備える各種弁類、ポンプ類等の作動は、これらと電気的に接続された制御装置３６により制御される。 Embodiment 1
FIG. 1 is a diagram showing a hot water storage type hot water supply system according to a first embodiment. The hot water storage type hot water supply system 35 according to the first embodiment shown in FIG. 1 includes a tank unit 33, an HP (heat pump) unit 7, and a remote control 44. The HP unit 7 and the tank unit 33 are connected via the HP forward piping 14, the HP return piping 15, and an electrical wiring (not shown). The tank unit 33 incorporates a control device 36. The operations of the various valves, pumps, and the like included in the tank unit 33 and the HP unit 7 are controlled by a controller 36 electrically connected to them.

リモコン４４は、運転動作指令及び設定値の変更に関するユーザーの操作を受け付ける機能を有する。リモコン４４は、操作端末またはユーザーインターフェース装置の例である。制御装置３６とリモコン４４の間は、有線または無線により、双方向にデータ通信可能に接続されている。リモコン４４には、図示を省略するが、貯湯式給湯システム３５の状態等の情報を表示する表示部、ユーザーが操作するスイッチ等の操作部、スピーカ、マイク等が搭載されている。リモコン４４は、台所に設置されてもよい。リモコン４４は、浴室に設置されてもよい。貯湯式給湯システム３５は、複数台のリモコン４４を備えてもよい。   The remote controller 44 has a function of receiving the operation of the user regarding the change of the driving operation command and the setting value. The remote control 44 is an example of an operation terminal or a user interface device. The control device 36 and the remote controller 44 are connected so as to be capable of bidirectional data communication by wire or wirelessly. Although not shown, the remote controller 44 is equipped with a display unit for displaying information such as the state of the hot water storage type hot water supply system 35, an operation unit such as a switch operated by a user, a speaker, a microphone and the like. The remote control 44 may be installed in the kitchen. The remote control 44 may be installed in the bathroom. The hot water storage type hot water supply system 35 may be provided with a plurality of remote controls 44.

ＨＰユニット７は、水を加熱する加熱手段の例である。ＨＰユニット７は、圧縮機１、水冷媒熱交換器３、膨張弁４、空気熱交換器６を冷媒配管５にて環状に接続した冷媒回路を備える。ＨＰユニット７は、この冷媒回路によりヒートポンプサイクルの運転を行う。水冷媒熱交換器３では、圧縮機１で圧縮された冷媒と、タンクユニット３３から導かれた水との間で熱を交換することで、水が加熱される。圧縮機１で圧縮された冷媒と、水道等の水源から直接供給される水とを水冷媒熱交換器３で熱交換させることができる構成を備えてもよい。   The HP unit 7 is an example of heating means for heating water. The HP unit 7 includes a refrigerant circuit in which the compressor 1, the water refrigerant heat exchanger 3, the expansion valve 4, and the air heat exchanger 6 are annularly connected by the refrigerant pipe 5. The HP unit 7 operates the heat pump cycle by this refrigerant circuit. In the water-refrigerant heat exchanger 3, the water is heated by exchanging heat between the refrigerant compressed by the compressor 1 and the water led from the tank unit 33. The refrigerant compressed by the compressor 1 and the water directly supplied from a water source such as a water supply may be heat-exchanged by the water refrigerant heat exchanger 3.

タンクユニット３３には、以下の各種部品及び配管などが内蔵されている。貯湯タンク８は、湯水を貯留する。貯湯タンク８の下部に設けられた水導入口８ａには、第３給水配管９ｃが接続されている。水道等の水源から供給される水（以下、「低温水」と称する）は、減圧弁３１で所定圧力に調圧された上で、第３給水配管９ｃを通って貯湯タンク８内に流入する。貯湯タンク８の上部には、温水導入出口８ｄ及び温水導出口８ｅが設けられている。温水導入出口８ｄには、送湯配管１３の一端と、高温配管２１の一端とが接続されている。高温配管２１は、貯湯タンク８内に貯留された湯を貯湯式給湯システム３５の外部へ供給する際に使用される。温水導出口８ｅには、第１温水導入配管２０ａが接続されている。   The tank unit 33 incorporates the following various components and piping. The hot water storage tank 8 stores hot and cold water. A third water supply pipe 9 c is connected to the water inlet 8 a provided at the lower part of the hot water storage tank 8. Water supplied from a water source such as water (hereinafter referred to as "low temperature water") is adjusted to a predetermined pressure by the pressure reducing valve 31, and then flows into the hot water storage tank 8 through the third water supply pipe 9c. . A hot water inlet / outlet 8 d and a hot water outlet 8 e are provided in the upper part of the hot water storage tank 8. One end of the hot water supply pipe 13 and one end of the high temperature pipe 21 are connected to the hot water inlet / outlet 8 d. The high temperature pipe 21 is used when the hot water stored in the hot water storage tank 8 is supplied to the outside of the hot water storage type hot water supply system 35. The first warm water inlet pipe 20a is connected to the warm water outlet 8e.

貯湯タンク８には、ＨＰユニット７を用いて加熱された高温水が温水導入出口８ｄから流入するとともに、水源から第３給水配管９ｃを通って供給される低温水が水導入口８ａから流入する。貯湯タンク８内には、上側が高温で下側が低温となる温度成層を形成して、湯水が貯留される。貯湯タンク８の表面には、複数の貯湯温度センサ４２，４３，５２が、相異なる高さの位置に取り付けられている。制御装置３６は、これらの貯湯温度センサ４２，４３，５２で貯湯タンク８内の湯水の温度分布を検出することにより、貯湯タンク８内の貯湯量及び蓄熱量を把握できる。   In the hot water storage tank 8, high temperature water heated using the HP unit 7 flows in from the hot water introduction outlet 8d, and low temperature water supplied from the water source through the third water supply pipe 9c flows in from the water inlet 8a. . In the hot water storage tank 8, a temperature stratification is formed in which the upper side is high temperature and the lower side is low temperature, and hot and cold water is stored. On the surface of the hot water storage tank 8, a plurality of hot water storage temperature sensors 42, 43, 52 are attached at different heights. The control device 36 can grasp the amount of stored hot water and the amount of stored heat in the hot water storage tank 8 by detecting the temperature distribution of the hot and cold water in the hot water storage tank 8 with the hot water storage temperature sensors 42, 43 and 52.

タンクユニット３３内には、循環ポンプ１２及び利用側熱交換器２０が内蔵されている。循環ポンプ１２は、タンクユニット３３内の後述する各種配管に湯水を循環させるためのポンプである。循環ポンプ１２は、ＨＰ往き配管１４の途中に接続されている。利用側熱交換器２０は、ＨＰユニット７または貯湯タンク８から供給される高温水と、２次側の加熱対象流体との間で熱を交換させることで、加熱対象流体を加熱する。本実施の形態における加熱対象流体は、浴槽３０から導かれる浴槽水である。加熱対象流体は、浴槽水に限定されるものではなく、例えば暖房用熱媒体でもよい。   In the tank unit 33, the circulation pump 12 and the use side heat exchanger 20 are built in. The circulation pump 12 is a pump for circulating hot and cold water through various pipes in the tank unit 33 described later. The circulation pump 12 is connected in the middle of the HP forward piping 14. The usage-side heat exchanger 20 heats the fluid to be heated by exchanging heat between the high temperature water supplied from the HP unit 7 or the hot water storage tank 8 and the fluid to be heated on the secondary side. The fluid to be heated in the present embodiment is bath water led from the bath 30. The fluid to be heated is not limited to bath water, and may be, for example, a heating heat medium.

本実施の形態では、利用側熱交換器２０の２次側の構成として、浴槽３０の浴槽水を循環させるふろ往き配管２７及びふろ戻り配管２８を例示して説明する。利用側熱交換器２０は、ふろ往き配管２７とふろ戻り配管２８の途中に設置されている。ふろ往き配管２７の途中には、利用側熱交換器２０から出た、熱交換後の浴槽水の温度を検出するふろ往き温度センサ３７が設置されている。ふろ戻り配管２８の途中には、浴槽水を循環させるためのふろ循環ポンプ２９と、浴槽３０から出た浴槽水の温度を検出するふろ戻り温度センサ３８とが設置されている。   In the present embodiment, as the configuration on the secondary side of the use-side heat exchanger 20, a description will be given by exemplifying a go-through pipe 27 and a return pipe 28 for circulating the bath water of the bath 30. The use-side heat exchanger 20 is installed in the middle of the blowout pipe 27 and the return pipe 28. In the middle of the blowout piping 27, a blowout temperature sensor 37 for detecting the temperature of the bath water after heat exchange, which has come out of the use side heat exchanger 20, is installed. In the middle of the bath return pipe 28, a bath circulation pump 29 for circulating bath water and a bath return temperature sensor 38 for detecting the temperature of the bath water discharged from the bath 30 are provided.

第１四方弁１８は、湯水が流入する入口であるｂポート及びｃポートと、湯水が流出する出口であるａポート及びｄポートとを備える流路切替手段である。第１四方弁１８は、４つの経路、すなわちａ−ｂ、ａ−ｃ、ｂ−ｄ、ｃ−ｄの間で流路切替可能に構成されている。   The first four-way valve 18 is a flow path switching unit including a b port and a c port, which are inlets to which hot water flows, and an a port and a d port, which are outlets from which the hot water flows. The first four-way valve 18 is configured to be capable of switching between four paths, that is, ab, ac, bd, and cd.

第２四方弁１１は、湯水が流入する入口であるａポート及びｄポートと、湯水が流出する出口であるｂポート及びｃポートとを備える流路切替手段である。第２四方弁１１は、４つの経路、すなわちａ−ｂ、ａ−ｃ、ｂ−ｄ、ｃ−ｄの間で流路切替可能に構成されている。   The second four-way valve 11 is a flow path switching unit including an a port and a d port, which are inlets through which the hot water flows, and b and c ports, which are outlets through which the hot water flows. The second four-way valve 11 is configured to be able to switch the flow path among four paths, that is, ab, ac, bd, and cd.

ＨＰ往き配管１４は、利用側熱交換器２０の１次側出口と、ＨＰユニット７の入口との間をつなぐ。ＨＰ戻り配管１５は、ＨＰユニット７の出口と、第１四方弁１８のｃポートとの間をつなぐ。第１水導出口配管１０ａは、貯湯タンク８の下部に設けられた水導出口８ｂと、第２四方弁１１のａポートとの間をつなぐ。第２水導出口配管１０ｂは、ＨＰ往き配管１４における循環ポンプ１２と利用側熱交換器２０の１次側出口との間にある分岐部と、第２四方弁１１のｃポートとの間をつなぐ。送湯配管１３は、第１四方弁１８のｄポートと、貯湯タンク８の上部の温水導入出口８ｄとの間をつなぐ。第１バイパス配管１６は、第１四方弁１８のａポートと、貯湯タンク８の温水導入口８ｃとの間をつなぐ。温水導入口８ｃは、貯湯タンク８の高さ方向の中央部と下部との間にある。第２バイパス配管１７は、ＨＰ往き配管１４における循環ポンプ１２とＨＰユニット７の入口との間にある分岐部と、第１四方弁１８のｂポートとの間をつなぐ。第１温水導入配管２０ａは、貯湯タンク８の上部の温水導出口８ｅと、第２四方弁１１のｄポートとの間をつなぐ。第２温水導入配管２０ｂは、第２四方弁１１のｂポートと、利用側熱交換器２０の１次側入口との間をつなぐ。   The HP forward piping 14 connects between the primary side outlet of the use side heat exchanger 20 and the inlet of the HP unit 7. The HP return pipe 15 connects between the outlet of the HP unit 7 and the c port of the first four-way valve 18. The first water outlet pipe 10 a connects the water outlet 8 b provided in the lower part of the hot water storage tank 8 and the a port of the second four-way valve 11. The second water outlet pipe 10 b is located between the branch portion of the HP forward pipe 14 between the circulation pump 12 and the primary side outlet of the use side heat exchanger 20 and the c port of the second four-way valve 11. connect. The hot water supply pipe 13 connects between the d port of the first four-way valve 18 and the hot water introduction outlet 8 d at the top of the hot water storage tank 8. The first bypass pipe 16 connects between the a port of the first four-way valve 18 and the hot water inlet 8 c of the hot water storage tank 8. The hot water inlet 8 c is between the central portion and the lower portion in the height direction of the hot water storage tank 8. The second bypass pipe 17 connects between a branch portion of the HP forward pipe 14 between the circulation pump 12 and the inlet of the HP unit 7 and the b port of the first four-way valve 18. The first hot water inlet pipe 20 a connects between the hot water outlet 8 e at the top of the hot water storage tank 8 and the d port of the second four-way valve 11. The second hot water inlet pipe 20 b connects between the b port of the second four-way valve 11 and the primary inlet of the use side heat exchanger 20.

給湯用混合弁２２は、高温側入口、低温側入口、及び出口を備える。ふろ用混合弁２３は、高温側入口、低温側入口、及び出口を備える。貯湯タンク８の上部の温水導入出口８ｄに一端が接続された高温配管２１の他端側は、二手に分岐して、給湯用混合弁２２の高温側入口と、ふろ用混合弁２３の高温側入口とに接続されている。   The hot water mixing valve 22 includes a high temperature side inlet, a low temperature side inlet, and an outlet. The bath mixing valve 23 includes a high temperature side inlet, a low temperature side inlet, and an outlet. The other end of the high temperature pipe 21 whose one end is connected to the hot water inlet / outlet 8d at the top of the hot water storage tank 8 is branched into two, and the high temperature side inlet of the hot water mixing valve 22 and the high temperature side of the bath mixing valve 23 Connected to the entrance.

三方弁７８は、湯水が流入する入口であるａポート及びｂポートと、湯水が流出するｃポートとを備える流路切替手段である。三方弁７８は、２つの経路、すなわちａ−ｃ、ｂ−ｃの間で流路切替可能に構成されている。第１給水配管９ａの一端は、水道等の水源に接続される。第１給水配管９ａの他端は、減圧弁３１を介して第２給水配管９ｂ及び第３給水配管９ｃに接続されている。第１給水配管９ａの途中には、第１給水配管９ａを通る水の温度を検出する給水温度センサ５０が取り付けられている。第２給水配管９ｂは、減圧弁３１の２次側と三方弁７８のａポートとの間をつなぐ。第３給水配管９ｃは、第２給水配管９ｂの途中から分岐し、貯湯タンク８の下部の水導入口８ａに接続されている。水配管１９の一端は、三方弁７８のｃポートに接続されている。水配管１９の他端側は、二手に分岐して、給湯用混合弁２２の低温側入口と、ふろ用混合弁２３の低温側入口とに接続されている。中温配管７９は、貯湯タンク８の高さ方向の中間部に設けられた中温導出口８ｆと、三方弁７８のｂポートとの間をつなぐ。中温導出口８ｆは、温水導入出口８ｄより低い位置にある。   The three-way valve 78 is a flow path switching unit including an a port and a b port, which are inlets to which hot water flows, and a c port, from which the hot water flows out. The three-way valve 78 is configured to be able to switch the flow path between two paths, that is, a-c and b-c. One end of the first water supply pipe 9a is connected to a water source such as a water supply. The other end of the first water supply pipe 9 a is connected to the second water supply pipe 9 b and the third water supply pipe 9 c via the pressure reducing valve 31. In the middle of the first water supply pipe 9a, a water supply temperature sensor 50 for detecting the temperature of water passing through the first water supply pipe 9a is attached. The second water supply pipe 9 b connects between the secondary side of the pressure reducing valve 31 and the a port of the three-way valve 78. The third water supply pipe 9 c branches from the middle of the second water supply pipe 9 b and is connected to the water inlet 8 a at the lower part of the hot water storage tank 8. One end of the water pipe 19 is connected to the c port of the three-way valve 78. The other end of the water pipe 19 is branched into two and connected to the low temperature side inlet of the hot water supply mixing valve 22 and the low temperature side inlet of the bath mixing valve 23. The middle-temperature pipe 79 connects the middle-temperature outlet 8 f provided at the middle in the height direction of the hot water storage tank 8 and the b port of the three-way valve 78. The medium temperature outlet 8f is at a lower position than the hot water inlet 8d.

三方弁７８は、中温配管７９が水配管１９に連通して第２給水配管９ｂが遮断される流路状態に切り替え可能である。この流路状態を以下「中温水利用状態」と称する。中温水利用状態において給湯先へ湯を供給する場合には、貯湯タンク８の中温導出口８ｆから中温配管７９へ流出する中温水が、水配管１９を通って、給湯用混合弁２２及びふろ用混合弁２３の低温側入口へ供給される。貯湯温度センサ５２は、中温導出口８ｆの近傍の貯湯タンク８の表面に取り付けられている。貯湯温度センサ５２により、中温水の温度を検出できる。   The three-way valve 78 can be switched to a flow path state in which the intermediate temperature pipe 79 communicates with the water pipe 19 and the second water supply pipe 9 b is shut off. This flow path state is hereinafter referred to as "middle warm water utilization state". When the hot water is supplied to the hot water destination in the medium hot water utilization state, the medium hot water flowing out from the medium temperature outlet 8f of the hot water storage tank 8 to the medium temperature pipe 79 passes through the water pipe 19 and is used for the hot water mixing valve 22 and the bath. It is supplied to the low temperature side inlet of the mixing valve 23. The hot water storage temperature sensor 52 is attached to the surface of the hot water storage tank 8 near the medium temperature outlet 8 f. The temperature of the warm water can be detected by the stored-water temperature sensor 52.

三方弁７８は、第２給水配管９ｂが水配管１９に連通して中温配管７９が遮断される流路状態に切り替え可能である。この流路状態を以下「中温水非利用状態」と称する。中温水非利用状態において給湯先へ湯を供給する場合には、水源から第１給水配管９ａ及び第２給水配管９ｂを経由して供給される低温水が、水配管１９を通って、給湯用混合弁２２及びふろ用混合弁２３の低温側入口へ供給される。   The three-way valve 78 can be switched to a flow path state in which the second water supply pipe 9 b communicates with the water pipe 19 and the intermediate temperature pipe 79 is shut off. Hereinafter, this channel state is referred to as "a state where middle warm water is not used". When hot water is supplied to the hot water supply destination in the middle warm water non-use state, low temperature water supplied from the water source via the first water supply pipe 9a and the second water supply pipe 9b passes through the water pipe 19 for hot water supply It is supplied to the low temperature side inlet of the mixing valve 22 and the mixing valve 23 for bath.

第１給湯配管２４は、給湯用混合弁２２の出口と、タンクユニット３３の筐体に設置された給湯栓３４との間をつなぐ。第１給湯配管２４の途中には、第１給湯配管２４を通る湯の流量を検出する給湯用流量センサ４８と、第１給湯配管２４を通る湯の温度を検出する給湯温度センサ５１とが設けられている。第２給湯配管２５は、ふろ用混合弁２３の出口と、ふろ往き配管２７の途中にある分岐部との間をつなぐ。第２給湯配管２５の途中には、第２給湯配管２５を開閉するふろ用電磁弁２６と、第２給湯配管２５を通る湯の流量を検出するふろ用流量センサ４５とが設けられている。   The first hot water supply pipe 24 connects between the outlet of the hot water supply mixing valve 22 and the hot water supply valve 34 installed in the housing of the tank unit 33. A hot water supply flow rate sensor 48 for detecting the flow rate of hot water passing through the first hot water supply pipe 24 and a hot water supply temperature sensor 51 for detecting the temperature of hot water passing through the first hot water supply pipe 24 are provided in the middle of the first hot water supply pipe 24. It is done. The second hot water supply pipe 25 connects between the outlet of the mixing valve 23 for the bath and the branch portion in the middle of the fork pipe 27. In the middle of the second hot water supply pipe 25, a solenoid valve 26 for bath for opening and closing the second hot water supply pipe 25 and a flow rate sensor 45 for bath for detecting the flow rate of hot water passing through the second hot water supply pipe 25 are provided.

給湯用混合弁２２は、貯湯タンク８の上部から高温配管２１を通って供給される高温水と、水配管１９から供給される中温水または低温水とを混合することで、給湯先へ供給される湯を温度調節する第一混合手段の例である。タンクユニット３３の外部から、給湯栓３４に対して、外部給湯配管（図示省略）が接続される。給湯用混合弁２２で温度調節された湯は、第１給湯配管２４、給湯栓３４、及び外部給湯配管を経由して、ユーザーが使用するシャワーまたはカラン等の蛇口のような給湯先へ供給される。   The hot water supply mixing valve 22 is supplied to the hot water supply destination by mixing the high temperature water supplied from the upper part of the hot water storage tank 8 through the high temperature pipe 21 and the medium warm water or low temperature water supplied from the water pipe 19. It is an example of the 1st mixing means which temperature-controls the hot water. An external hot water supply pipe (not shown) is connected to the hot water supply valve 34 from the outside of the tank unit 33. Hot water whose temperature is controlled by the hot water supply mixing valve 22 is supplied to a hot water supply destination such as a shower or a faucet such as a caran used by the user via the first hot water supply pipe 24, the hot water supply valve 34, and the external hot water supply pipe. Ru.

ユーザーは、リモコン４４を操作することで、給湯用混合弁２２の給湯先、すなわち上記蛇口に対する給湯設定温度を所望の値に変更できる。給湯用混合弁２２の給湯先へ給湯する際には、制御装置３６は、給湯温度センサ５１で検出される給湯温度が、給湯設定温度に等しくなるように、給湯用混合弁２２を制御する。   The user can change the hot water supply set temperature for the hot water supply destination of the hot water supply mixing valve 22, that is, the faucet, to a desired value by operating the remote control 44. When the hot water supply destination of the hot water supply mixing valve 22 is heated, the control device 36 controls the hot water supply mixing valve 22 so that the hot water supply temperature detected by the hot water supply temperature sensor 51 becomes equal to the hot water supply set temperature.

ふろ用混合弁２３は、貯湯タンク８の上部から高温配管２１を通って供給される高温水と、水配管１９から供給される中温水または低温水とを混合することで、給湯先すなわち浴槽３０へ供給される湯を温度調節する第二混合手段の例である。浴槽３０へ湯を供給する場合には、以下のようになる。ふろ用電磁弁２６が開かれる。ふろ用混合弁２３で温度調節された湯は、第２給湯配管２５と、ふろ往き配管２７及びふろ戻り配管２８の少なくとも一方を通って、浴槽３０へ流入する。   The bath mixing valve 23 mixes hot water supplied from the upper portion of the hot water storage tank 8 through the high temperature pipe 21 with middle warm water or low temperature water supplied from the water pipe 19 to provide a hot water supply destination, ie, the bath 30. It is an example of the 2nd mixing means which temperature-controls the hot water supplied to it. In the case of supplying hot water to the bathtub 30, the following is performed. The bath solenoid valve 26 is opened. The hot water whose temperature has been adjusted by the mixing valve 23 for bath flows into the bath 30 through at least one of the second hot water supply pipe 25, the inflowing pipe 27 and the return pipe 28.

ユーザーは、リモコン４４を操作することで、ふろ用混合弁２３の給湯先、すなわち浴槽３０に対する給湯設定温度を所望の値に変更できる。浴槽３０へ給湯する際には、制御装置３６は、ふろ往き温度センサ３７またはふろ戻り温度センサ３８で検出される給湯温度が、給湯設定温度に等しくなるように、ふろ用混合弁２３を制御する。   By operating the remote control 44, the user can change the hot water supply temperature for the bath mixing valve 23, that is, the hot water setting temperature for the bath 30, to a desired value. When supplying water to the bath tub 30, the control device 36 controls the mixing valve 23 for the bath so that the hot water supply temperature detected by the going-out temperature sensor 37 or the back-off temperature sensor 38 becomes equal to the hot water supply set temperature. .

第１四方弁１８は、ＨＰ戻り配管１５と送湯配管１３とが連通する形態、ＨＰ戻り配管１５と第１バイパス配管１６とが連通する形態、第１バイパス配管１６と第２バイパス配管１７とが連通する形態、及び、送湯配管１３と第２バイパス配管１７とが連通する形態、の４つの流路形態に切り替え可能である。第２四方弁１１は、第１水導出口配管１０ａと第２水導出口配管１０ｂとが連通する形態と、第１水導出口配管１０ａと第２温水導入配管２０ｂとが連通する形態、及び、第１温水導入配管２０ａと第２温水導入配管２０ｂとが連通する形態の３つの流路形態に切り替え可能である。   The first four-way valve 18 has a form in which the HP return pipe 15 communicates with the hot water supply pipe 13, a form in which the HP return pipe 15 communicates with the first bypass pipe 16, a first bypass pipe 16 and a second bypass pipe 17 Can be switched to the four flow path forms of the form in which the hot water supply pipe 13 and the second bypass pipe 17 are in communication. The second four-way valve 11 has a form in which the first water outlet pipe 10a and the second water outlet pipe 10b communicate with each other, a form in which the first water outlet pipe 10a and the second hot water inlet pipe 20b communicate with each other, It is possible to switch to three flow path configurations in which the first hot water inlet pipe 20a and the second hot water inlet pipe 20b communicate with each other.

以下、本実施の形態１の貯湯式給湯システム３５の動作について、さらに説明する。水源から第１給水配管９ａを通って供給された低温水は、減圧弁３１で所定圧に減圧され、第３給水配管９ｃを通って貯湯タンク８の下部に流入する。貯湯タンク８内は、常に満水状態に維持される。ＨＰユニット７で加熱された高温水を貯湯タンク８に蓄積する運転である蓄熱運転のときには、以下のようになる。ＨＰユニット７及び循環ポンプ１２が運転される。貯湯タンク８内の下部の水が、第１水導出口配管１０ａ、第２四方弁１１、第２水導出口配管１０ｂ、及びＨＰ往き配管１４を経由して、ＨＰユニット７内の水冷媒熱交換器３に送られる。水冷媒熱交換器３を通過する間に加熱された湯すなわち高温水が、ＨＰ戻り配管１５、第１四方弁１８、及び送湯配管１３を経由して、温水導入出口８ｄから貯湯タンク８に流入する。このとき、第２四方弁１１はａポートとｃポートとが導通し、第１四方弁１８はｃポートとｄポートとが導通している。   Hereinafter, the operation of the hot water storage type hot water supply system 35 of the first embodiment will be further described. The low temperature water supplied from the water source through the first water supply pipe 9a is depressurized to a predetermined pressure by the pressure reducing valve 31, and flows into the lower portion of the hot water storage tank 8 through the third water supply pipe 9c. The hot water storage tank 8 is always kept full. In the case of a heat storage operation which is an operation of accumulating high temperature water heated by the HP unit 7 in the hot water storage tank 8, the following occurs. The HP unit 7 and the circulation pump 12 are operated. The water in the lower part of the hot water storage tank 8 passes through the first water outlet pipe 10a, the second four-way valve 11, the second water outlet pipe 10b, and the HP forward pipe 14 to heat the water refrigerant in the HP unit 7 It is sent to the switch 3. Hot water, ie, high-temperature water heated while passing through the water refrigerant heat exchanger 3, passes from the hot water introduction outlet 8d to the hot water storage tank 8 via the HP return pipe 15, the first four-way valve 18, and the hot water pipe 13. To flow. At this time, port a and port c are electrically connected in the second four-way valve 11, and port c and port d are electrically connected in the first four-way valve.

蓄熱運転のとき、制御装置３６は、ＨＰユニット７から流出する湯の温度（以下、「加熱後温度」と称する）が目標値に等しくなるように、ＨＰユニット７及び循環ポンプ１２の少なくとも一方の動作を制御してもよい。加熱後温度の目標値は、例えば、６５℃〜９０℃の範囲にある温度でもよい。ＨＰ戻り配管１５に取り付けられたＨＰ出湯温度センサ３９により加熱後温度を検出できる。   During the heat storage operation, the controller 36 controls at least one of the HP unit 7 and the circulation pump 12 so that the temperature of the hot water flowing out of the HP unit 7 (hereinafter referred to as “temperature after heating”) becomes equal to the target value. The operation may be controlled. The target value of the post-heating temperature may be, for example, a temperature in the range of 65 ° C to 90 ° C. The HP outlet water temperature sensor 39 attached to the HP return pipe 15 can detect the temperature after heating.

ＨＰ往き配管１４に取り付けられたＨＰ入水温度センサ４０は、ＨＰユニット７に流入する水の温度（以下、「加熱前温度」と称する）を検出できる。制御装置３６は、ＨＰ入水温度センサ４０で検出される加熱前温度が基準（例えば６０℃）以上になった場合に、貯湯タンク８の全量が湯で満たされたと判断して、蓄熱運転を終了してもよい。制御装置３６は、必要な蓄熱量に応じて、貯湯タンク８の全量が湯で満たされる前に蓄熱運転を終了してもよい。   The HP incoming water temperature sensor 40 attached to the HP forward pipe 14 can detect the temperature of water flowing into the HP unit 7 (hereinafter referred to as “the temperature before heating”). The control device 36 determines that the entire amount of the hot water storage tank 8 is filled with hot water when the pre-heating temperature detected by the HP incoming water temperature sensor 40 exceeds the reference (for example, 60 ° C.), and ends the heat storage operation. You may The control device 36 may end the heat storage operation before the entire amount of the hot water storage tank 8 is filled with the hot water according to the required heat storage amount.

ＨＰユニット７のようなヒートポンプ方式により水を加熱する運転においては、一般に、加熱前温度が低いときには加熱効率が高くなり、加熱前温度が高いときには加熱効率が低くなるという特性がある。   In the operation of heating water by a heat pump system such as the HP unit 7, generally, the heating efficiency is high when the temperature before heating is low, and the heating efficiency is low when the temperature before heating is high.

貯湯タンク８に貯えられた湯は、さまざまな要因で、温度低下を起こし、貯湯タンク８内に中温水が徐々に発生していく。例えば、貯えられた時間が長くなるにつれて、自然放熱により、貯湯タンク８内の湯が温度低下を生じる。また、利用側熱交換器２０を用いたふろ追焚き運転あるいは床暖房等を行うことで、貯湯タンク８内に中温水が生成される。また、ふろ排熱回収運転を行うことで、貯湯タンク８内の水が浴槽３０内の湯との熱交換により加熱されることで中温水が生成される。以下では、例として、ふろ追焚き運転とふろ排熱回収運転を行う場合の動作及び中温水の生成について説明する。   The hot water stored in the hot water storage tank 8 causes a temperature drop due to various factors, and the warm water is gradually generated in the hot water storage tank 8. For example, as the stored time lengthens, the heat in the hot water storage tank 8 causes a temperature decrease due to natural heat release. In addition, middle-class hot water is generated in the hot-water storage tank 8 by performing post-heating operation or floor heating using the use-side heat exchanger 20. Further, by performing the bath exhaust heat recovery operation, the water in the hot water storage tank 8 is heated by heat exchange with the hot water in the bath 30, so that the inside warm water is generated. In the following, as an example, the operation in the case of performing the chase-up operation and the chute exhaust heat recovery operation and the generation of the medium-temperature water will be described.

ふろ追焚き運転を行う場合には、以下のようになる。リモコン４４により制御装置３６がふろ追焚き運転開始の指示を受けるとき、または、ふろ循環ポンプ２９の運転により浴槽３０内の浴槽水の温度をふろ戻り温度センサ３８で検出し、所定温度以下まで浴槽３０の温度低下があるときは、ふろ追焚き運転が開始される。ふろ追焚き運転が開始されると、ふろ循環ポンプ２９が動作し、浴槽３０内の浴槽水が、ふろ戻り配管２８、利用側熱交換器２０、及びふろ往き配管２７を通って浴槽３０内に戻るように循環する。一方、循環ポンプ１２も動作して、貯湯タンク８の上部より高温の貯湯水が、第１温水導入配管２０ａ、第２四方弁１１、及び第２温水導入配管２０ｂを経由して、利用側熱交換器２０に送られる。高温の貯湯水は、利用側熱交換器２０を通過する間に浴槽水に熱を奪われることで、温度が低下し、中温水になる。この中温水の温度は、例えば５０℃程度である。この中温水は、利用側熱交換器２０からＨＰ往き配管１４、第２バイパス配管１７、第１四方弁１８、及び第１バイパス配管１６を経由して、温水導入口８ｃから貯湯タンク８に流入する。このとき、第２四方弁１１はｄポートとｂポートとが導通し、第１四方弁１８はｂポートとａポートとが導通している。   The following is the case when performing furo chase operation. When the control device 36 receives an instruction to start the chute operation by the remote control 44 or the operation of the chute circulation pump 29, the temperature of the bath water in the tub 30 is detected by the chute temperature sensor 38, and the tub is kept below a predetermined temperature. When there is a temperature drop of 30, chase operation is started. When the chase operation is started, the circulation circulation pump 29 is operated, and the bath water in the tub 30 is passed through the back pipe 28, the heat exchanger 20 on the user side, and the forward pipe 27 into the tub 30. It circulates back. On the other hand, the circulating pump 12 also operates, and the hot water stored at a higher temperature than the upper portion of the hot water storage tank 8 passes through the first hot water inlet pipe 20a, the second four-way valve 11, and the second hot water inlet pipe 20b. It is sent to the switch 20. The temperature of the high-temperature hot water drops from the bath water while passing through the use-side heat exchanger 20, so that the temperature drops and it becomes middle warm water. The temperature of the middle warm water is, for example, about 50.degree. The middle warm water flows from the hot water inlet 8 c into the hot water storage tank 8 from the use side heat exchanger 20 via the HP forward piping 14, the second bypass piping 17, the first four-way valve 18, and the first bypass piping 16. Do. At this time, the d-port and the b-port of the second four-way valve 11 are electrically connected, and the b-port and the a-port of the first four-way valve 18 are electrically connected.

このようなふろ追焚きを継続するにつれて、貯湯タンク８内の高温の貯湯水が減少し、中温水が増加していく。ふろ追焚きで生成された中温水が貯湯タンク８内に多量にある状態で、蓄熱運転を実施すると、低温水に代えて中温水をＨＰユニット７で加熱することになるため、加熱前温度が高くなり、ＨＰユニット７の加熱効率が低くなる。   The hot water storage in the hot water storage tank 8 decreases and the medium hot water increases as the furo repurposing continues. If the heat storage operation is performed in a state where a large amount of middle warm water generated by the chase is in the hot water storage tank 8, the middle warm water is heated by the HP unit 7 instead of low temperature water. It becomes high and the heating efficiency of HP unit 7 becomes low.

ふろ排熱回収運転を行う場合には、以下のようになる。リモコン４４により制御装置３６がふろ排熱回収開始の指示を受けるときには、ふろ排熱回収運転が開始される。ふろ排熱回収運転が開始されると、まず、貯湯タンク８の貯湯状態が、ふろ排熱回収運転を実施できる状態であるかどうかを以下のようにして確認する。ふろ循環ポンプ２９を動作させ、浴槽３０内の浴槽水の温度をふろ戻り温度センサ３８により検出する。貯湯タンク８の下部の温度を貯湯温度センサ４３により検出する。貯湯温度センサ４３で検出された貯湯タンク８の下部の温度が、ふろ戻り温度センサ３８で検出された浴槽３０内の浴槽水の温度より低い場合には、ふろ排熱回収運転を実施可能と判断する。ふろ排熱回収運転を実施可能と判断された場合には、循環ポンプ１２も動作させる。貯湯タンク８の下部より、低温の貯湯水が、第１水導出口配管１０ａ、第２四方弁１１、及び第２温水導入配管２０ｂを経由して、利用側熱交換器２０に送られる。低温の貯湯水は、利用側熱交換器２０を通過する間に浴槽水から熱を受け取ることで、温度が上昇し、中温水になる。この中温水の温度は、例えば３０℃程度である。この中温水は、利用側熱交換器２０からＨＰ往き配管１４、第２バイパス配管１７、第１四方弁１８、及び第１バイパス配管１６を経由して、温水導入口８ｃから貯湯タンク８に流入する。このとき、第２四方弁１１はａポートとｂポートとが導通し、第１四方弁１８はｂポートとａポートとが導通している。   In the case of performing the bath exhaust heat recovery operation, it is as follows. When the controller 36 receives an instruction to start the waste heat recovery from the remote controller 44, the waste heat recovery operation is started. When the bath exhaust heat recovery operation is started, first, whether or not the state of the hot water storage tank 8 is capable of performing the bath exhaust heat recovery operation is confirmed as follows. The bath circulation pump 29 is operated, and the temperature of the bath water in the bath 30 is detected by the bath return temperature sensor 38. The temperature of the lower part of the hot water storage tank 8 is detected by a hot water storage temperature sensor 43. If the temperature of the lower part of the hot water storage tank 8 detected by the hot water storage temperature sensor 43 is lower than the temperature of the bath water in the bathtub 30 detected by the backflow temperature sensor 38, it is determined that the bath exhaust heat recovery operation can be performed. Do. If it is determined that the bath exhaust heat recovery operation can be performed, the circulation pump 12 is also operated. Low temperature hot water from the lower part of the hot water storage tank 8 is sent to the use-side heat exchanger 20 via the first water outlet pipe 10a, the second four-way valve 11, and the second hot water inlet pipe 20b. By passing heat from the bath water while passing through the use-side heat exchanger 20, the low-temperature hot water rises in temperature and becomes warm water. The temperature of the medium temperature water is, for example, about 30 ° C. The middle warm water flows from the hot water inlet 8 c into the hot water storage tank 8 from the use side heat exchanger 20 via the HP forward piping 14, the second bypass piping 17, the first four-way valve 18, and the first bypass piping 16. Do. At this time, port a and port b are electrically connected in the second four-way valve 11, and port b and port a are electrically connected in the first four-way valve.

貯湯温度センサ４３で検出される貯湯タンク８の下部の温度が、ふろ戻り温度センサ３８で検出される浴槽水の温度に近くなると、それ以上の排熱回収、すなわち浴槽水から低温の貯湯水への伝熱が行われなくなる。制御装置３６は、貯湯温度センサ４３の検出温度とふろ戻り温度センサ３８の検出温度との差が基準に比べて小さくなった場合には、ふろ排熱回収運転を終了する。   When the temperature of the lower part of the hot water storage tank 8 detected by the hot water storage temperature sensor 43 becomes close to the temperature of the bath water detected by the bath return temperature sensor 38, the exhaust heat is further recovered. Heat transfer will not occur. When the difference between the temperature detected by the hot water storage temperature sensor 43 and the temperature detected by the backflow temperature sensor 38 becomes smaller than the reference, the control device 36 ends the bath exhaust heat recovery operation.

このようなふろ排熱回収運転を行うと、貯湯タンク８内の低温水が減少し、中温水が増加する。ふろ排熱回収運転で生成された中温水が貯湯タンク８内に多量にある状態で、蓄熱運転を実施すると、低温水に代えて中温水をＨＰユニット７で加熱することになるため、加熱前温度が高くなり、ＨＰユニット７の加熱効率が低くなる。   When such a bath exhaust heat recovery operation is performed, the low temperature water in the hot water storage tank 8 decreases, and the middle warm water increases. If the heat storage operation is performed with a large amount of middle warm water generated in the bath exhaust heat recovery operation in the hot water storage tank 8, the middle warm water will be heated by the HP unit 7 instead of low temperature water. The temperature rises and the heating efficiency of the HP unit 7 decreases.

本実施の形態であれば、三方弁７８が中温水利用状態にあるときに給湯先へ湯を供給する場合には、中温配管７９から供給される中温水が給湯用混合弁２２及びふろ用混合弁２３へ供給される。貯湯タンク８内の中温水が中温配管７９へ流出すると、低温水が第３給水配管９ｃから貯湯タンク８の下部へ流入する。本実施の形態であれば、貯湯タンク８内の中温水を給湯に利用できるので、中温水が持つ熱量を有効利用できる。また、貯湯タンク８内の中温水を消費することで、貯湯タンク８内の中温水を、第３給水配管９ｃから流入する低温水に置換できる。このため、蓄熱運転を実施したときに、加熱前温度を低くすることができ、ＨＰユニット７の加熱効率が高くなる。   In the case of the present embodiment, when hot water is supplied to the hot water supply destination when the three-way valve 78 is in the use of medium hot water, the middle warm water supplied from the medium temperature pipe 79 mixes the hot water mixing valve 22 and the bath. The valve 23 is supplied. When the middle warm water in the hot water storage tank 8 flows out to the middle temperature pipe 79, low temperature water flows from the third water supply pipe 9c to the lower part of the hot water storage tank 8. In the present embodiment, since the middle warm water in the hot water storage tank 8 can be used for hot water supply, the amount of heat possessed by the middle warm water can be effectively used. In addition, by consuming the warm water in the hot water storage tank 8, the warm water in the hot water storage tank 8 can be replaced with the low temperature water flowing in from the third water supply pipe 9c. Therefore, when the heat storage operation is performed, the temperature before heating can be lowered, and the heating efficiency of the HP unit 7 becomes high.

次に、給湯用混合弁２２を用いた給湯に関する制御について、図２を参照して説明する。図２は、実施の形態１において実行されるルーチンのフローチャートである。図２は、三方弁７８の切り替えの制御に関するフローチャートである。本実施の形態では、制御装置３６が本フローチャートの処理を実行する。制御装置３６は、貯湯式給湯システム３５の状態にかかわらず、本フローチャートのルーチンを周期的に繰り返し実行する。制御装置３６は、給湯用混合弁２２を用いた給湯をユーザーが使用することが想定される場合には、常時、本フローチャートのルーチンを繰り返し実行する。   Next, control regarding hot water supply using the hot water supply mixing valve 22 will be described with reference to FIG. FIG. 2 is a flowchart of the routine executed in the first embodiment. FIG. 2 is a flowchart relating to control of switching of the three-way valve 78. In the present embodiment, control device 36 executes the processing of this flowchart. The control device 36 periodically and repeatedly executes the routine of this flowchart regardless of the state of the hot water storage type hot water supply system 35. When it is assumed that the user uses the hot water supply using the hot water supply mixing valve 22, the control device 36 repeatedly executes the routine of this flowchart at all times.

図２のステップＳ１０では、給湯用混合弁２２の給湯先への給湯が実行中であるか停止中であるかを判定する。本実施の形態では、第１給湯配管２４の給湯用流量センサ４８の出力に基づいて、給湯用混合弁２２の給湯先への給湯が実行中であるか停止中であるかを判定できる。給湯用混合弁２２の給湯先への給湯が実行中である場合には、三方弁７８の切り替えを実施することなく、ルーチンを終了する。   In step S10 of FIG. 2, it is determined whether hot water supply to the hot water supply destination of the hot water supply mixing valve 22 is in progress or being stopped. In the present embodiment, based on the output of the hot water supply flow rate sensor 48 of the first hot water supply pipe 24, it can be determined whether hot water supply to the hot water supply destination of the hot water supply mixing valve 22 is in progress or stopped. If hot water supply to the hot water supply destination of the mixing valve 22 for hot water supply is in progress, the routine is ended without switching the three-way valve 78.

仮に、給湯用混合弁２２の給湯先への給湯が実行中のときに三方弁７８の切り替えを実施すると、給湯用混合弁２２の低温側入口に流入する水が、中温水から低温水へ、あるいは低温水から中温水へ、切り替わることで、給湯温度が変動しやすい。給湯温度センサ５１で検出される温度に応じて給湯用混合弁２２が制御されるが、少なくとも給湯用混合弁２２から給湯温度センサ５１までの流路容積に相当する湯の温度は制御できないなどの理由で、給湯用混合弁２２の低温側入口に流入する水の温度の変動が給湯温度の変動をもたらすことを完全に防止することはできない。これに対し、本実施の形態であれば、給湯用混合弁２２の給湯先への給湯が実行中のときには三方弁７８の切り替えを実施しないようにすることで、給湯温度が変動することをより確実に抑制できる。   Temporarily, if the three-way valve 78 is switched when hot water supply to the hot water supply destination of the hot water supply mixing valve 22 is being performed, the water flowing into the low temperature side inlet of the hot water supply mixing valve 22 changes from middle warm water to low temperature water, Alternatively, the hot water supply temperature is likely to fluctuate by switching from low temperature water to medium temperature water. According to the temperature detected by the hot water supply temperature sensor 51, the hot water supply mixing valve 22 is controlled, but at least the temperature of hot water corresponding to the flow path volume from the hot water supply mixing valve 22 to the hot water supply temperature sensor 51 can not be controlled For this reason, it can not be completely prevented that fluctuations in the temperature of water flowing into the low temperature side inlet of the hot water supply mixing valve 22 cause fluctuations in the hot water supply temperature. In the present embodiment, on the other hand, the hot water supply temperature fluctuates by not switching the three-way valve 78 when hot water supply to the hot water supply destination of the hot water supply mixing valve 22 is in progress. It can be suppressed reliably.

給湯用混合弁２２の給湯先への給湯が停止中である場合には、ステップＳ１０からステップＳ１１へ移行する。ステップＳ１１では、中温水の温度を貯湯温度センサ５２により検出する。本実施の形態であれば、中温配管７９に中温水が流れていない状態でも、中温水の温度を貯湯温度センサ５２により正確に検出できる。ステップＳ１１からステップＳ１２へ移行する。   When the hot water supply to the hot water supply destination of the hot water supply mixing valve 22 is stopped, the process proceeds from step S10 to step S11. In step S11, the temperature of the warm water is detected by the hot water storage temperature sensor 52. In the present embodiment, the temperature of the medium-temperature water can be accurately detected by the stored-water temperature sensor 52 even when the medium-temperature water does not flow through the medium-temperature pipe 79. The process proceeds from step S11 to step S12.

ステップＳ１２では、三方弁７８が、ａポート−ｃポート間を導通する状態であるかどうか、すなわち中温水非利用状態であるかどうかを判定する。三方弁７８が中温水非利用状態である場合には、ステップＳ１２からステップＳ１３へ移行する。三方弁７８が中温水非利用状態でない場合、すなわち三方弁７８が中温水利用状態である場合には、ステップＳ１２からステップＳ１６へ移行する。   In step S12, it is determined whether or not the three-way valve 78 is in a state of conducting between the a port and the c port, that is, whether or not the middle warm water is not used. If the three-way valve 78 is in the middle water non-use state, the process proceeds from step S12 to step S13. If the three-way valve 78 is not in the middle-water use state, that is, if the three-way valve 78 is in the middle-water use state, the process proceeds from step S12 to step S16.

現在の三方弁７８が中温水非利用状態であるステップＳ１３では、ステップＳ１１で検出された中温水の温度が、第一基準温度に比べて低いか否かを判定する。第一基準温度は、給湯用混合弁２２の給湯先に対する給湯設定温度より低い温度である。第一基準温度は、当該給湯設定温度に比べて所定の第一温度差だけ低い温度でもよい。当該第一温度差は、例えば、８℃でもよい。中温水の温度が第一基準温度未満であるか第一基準温度に等しい場合に、中温水の温度が第一基準温度に比べて低い、と判定してもよい。   In step S13 in which the current three-way valve 78 is in the middle water non-use state, it is determined whether or not the temperature of the middle water detected in step S11 is lower than the first reference temperature. The first reference temperature is a temperature lower than the hot water supply set temperature for the hot water supply destination of the hot water supply mixing valve 22. The first reference temperature may be a temperature lower than the hot water supply set temperature by a predetermined first temperature difference. The first temperature difference may be, for example, 8 ° C. If the temperature of the middle warm water is less than or equal to the first reference temperature, it may be determined that the temperature of the middle warm water is lower than the first reference temperature.

中温水の温度が第一基準温度に比べて低くない場合には、三方弁７８を中温水非利用状態から中温水利用状態へ切り替えることなく、ステップＳ１３の後、ルーチンを終了する。中温水の温度が第一基準温度に比べて低い場合には、ステップＳ１３からステップＳ１４へ移行する。ステップＳ１４では、給湯用混合弁２２の待機位置が第二待機位置から第一待機位置へ変化するように、給湯用混合弁２２を作動させる。ステップＳ１４からステップＳ１５へ移行する。ステップＳ１５では、三方弁７８を中温水非利用状態から中温水利用状態へ切り替える。すなわち、三方弁７８を、ａポート−ｃポート間を導通する状態から、ｂポート−ｃポート間を導通する状態へ切り替える。ステップＳ１５の後、ルーチンを終了する。   If the temperature of the middle warm water is not lower than the first reference temperature, the routine is ended after step S13 without switching the three-way valve 78 from the middle warm water non-use state to the middle warm water use state. If the temperature of the medium-temperature water is lower than the first reference temperature, the process proceeds from step S13 to step S14. In step S14, the hot water supply mixing valve 22 is operated such that the standby position of the hot water supply mixing valve 22 changes from the second standby position to the first standby position. The process proceeds from step S14 to step S15. In step S15, the three-way valve 78 is switched from the middle warm water non-use state to the middle warm water use state. That is, the three-way valve 78 is switched from the state in which the port a and the port c are electrically connected to the state in which the port b and the port c are electrically connected. After step S15, the routine ends.

ここで、給湯用混合弁２２の待機位置について説明する。給湯用混合弁２２の待機位置とは、給湯用混合弁２２の給湯先への給湯が停止中のときに給湯用混合弁２２が待機している位置である。第一待機位置は、三方弁７８が中温水利用状態であるときの給湯用混合弁２２の待機位置である。制御装置３６は、以下のようにして、第一待機位置を計算できる。制御装置３６は、貯湯温度センサ４２で検出される高温水の温度と、貯湯温度センサ５２で検出される中温水の温度とに基づいて、給湯設定温度を満足できるような高温水と中温水との混合比を計算できる。制御装置３６は、給湯用混合弁２２において、そのような混合比を満足できるように、高温側入口に連通する開口面積と、低温側入口に連通する開口面積との比を計算できる。制御装置３６は、そのような混合比または開口面積の比を満足できるように、給湯用混合弁２２の弁体の待機位置を計算できる。そのような弁体の待機位置が第一待機位置に相当する。   Here, the standby position of the hot water supply mixing valve 22 will be described. The standby position of the hot water supply mixing valve 22 is a position where the hot water supply mixing valve 22 is on standby when hot water supply to the hot water supply destination of the hot water supply mixing valve 22 is stopped. The first standby position is a standby position of the hot water supply mixing valve 22 when the three-way valve 78 is in the middle warm water utilization state. The controller 36 can calculate the first standby position as follows. The control device 36 is configured to satisfy the hot water supply set temperature based on the temperature of the high temperature water detected by the hot water storage temperature sensor 42 and the temperature of the middle warm water detected by the hot water storage temperature sensor 52 The mixing ratio of can be calculated. The controller 36 can calculate the ratio of the opening area communicating with the high temperature side inlet and the opening area communicating with the low temperature side inlet so that the mixing ratio for hot water supply can be satisfied. The controller 36 can calculate the standby position of the valve body of the hot water mixing valve 22 so as to satisfy such mixing ratio or opening area ratio. The standby position of such a valve body corresponds to the first standby position.

給湯用混合弁２２の給湯先への給湯が停止中で三方弁７８が中温水利用状態であるときに給湯用混合弁２２が第一待機位置にあるようにすることで、給湯が開始された場合に、給湯温度を速やかに給湯設定温度に近づけることが可能となる。   The hot water supply is started by setting the hot water supply mixing valve 22 in the first standby position when the hot water supply to the hot water supply destination of the hot water supply mixing valve 22 is stopped and the three-way valve 78 is in the middle hot water utilization state In this case, it is possible to quickly bring the hot water supply temperature close to the hot water supply set temperature.

第二待機位置は、三方弁７８が中温水非利用状態であるときの給湯用混合弁２２の待機位置である。制御装置３６は、以下のようにして、第二待機位置を計算できる。制御装置３６は、貯湯温度センサ４２で検出される高温水の温度と、給水温度センサ５０で検出される低温水の温度とに基づいて、給湯設定温度を満足できるような高温水と低温水との混合比を計算できる。制御装置３６は、給湯用混合弁２２において、そのような混合比を満足できるように、高温側入口に連通する開口面積と、低温側入口に連通する開口面積との比を計算できる。制御装置３６は、そのような混合比または開口面積の比を満足できるように、給湯用混合弁２２の弁体の待機位置を計算できる。そのような弁体の待機位置が第二待機位置に相当する。   The second standby position is a standby position of the hot water supply mixing valve 22 when the three-way valve 78 is in the non-use state of the medium temperature water. The controller 36 can calculate the second standby position as follows. The controller 36 controls the high-temperature water and the low-temperature water to satisfy the hot water supply set temperature based on the temperature of the high-temperature water detected by the stored-water temperature sensor 42 and the temperature of the low-temperature water detected by the feed water temperature sensor 50. The mixing ratio of can be calculated. The controller 36 can calculate the ratio of the opening area communicating with the high temperature side inlet and the opening area communicating with the low temperature side inlet so that the mixing ratio for hot water supply can be satisfied. The controller 36 can calculate the standby position of the valve body of the hot water mixing valve 22 so as to satisfy such mixing ratio or opening area ratio. The standby position of such a valve body corresponds to the second standby position.

給湯用混合弁２２の給湯先への給湯が停止中で三方弁７８が中温水非利用状態であるときに給湯用混合弁２２が第二待機位置にあるようにすることで、給湯が開始された場合に、給湯温度を速やかに給湯設定温度に近づけることが可能となる。   The hot water supply is started by setting the hot water supply mixing valve 22 in the second standby position when the hot water supply to the hot water supply destination of the hot water supply mixing valve 22 is stopped and the three-way valve 78 is not in use. In this case, it is possible to quickly bring the hot water supply temperature close to the hot water supply set temperature.

貯湯タンク８の中間部は、湯水の放熱、貯湯タンク８内の高温部と低温部との熱拡散、ふろ追焚き運転またはふろ排熱回収運転のときの温水導入口８ｃから貯湯タンク８への中温水の流入、などの影響により、温度変動が大きい。このため、貯湯タンク８から中温配管７９へ流出する中温水の温度は、急激な変動、例えば１秒間に５℃以上の変動、を生じることもある。   The middle part of the hot water storage tank 8 is the heat radiation of hot water, the heat diffusion between the high temperature part and the low temperature part in the hot water storage tank 8, the hot water introduction port 8c from the hot water introduction port 8c at the time of furo chase operation or bath exhaust heat recovery operation. Temperature fluctuation is large due to the influence of middle warm water and so on. For this reason, the temperature of the medium-temperature water flowing out from the hot water storage tank 8 to the medium-temperature pipe 79 may cause a rapid change, for example, a change of 5 ° C. or more in 1 second.

仮に、貯湯温度センサ５２で検出された中温水の温度が給湯設定温度以下になったことを契機として三方弁７８を中温水非利用状態から中温水利用状態に切り替えたとすると、その後の中温水の温度変動により、中温水の温度が給湯設定温度を超える可能性がある。そのような場合、給湯用混合弁２２から給湯先へ供給される湯の温度が給湯設定温度より高くなってしまう。これに対し、本実施の形態であれば、中温水の温度が、給湯設定温度より低い第一基準温度に比べて低くなるまでは、三方弁７８を中温水非利用状態から中温水利用状態に切り替えない。このため、貯湯タンク８の中間部の温度が変動しやすい状況のときでも、給湯用混合弁２２から給湯先へ供給される湯の温度が給湯設定温度より高くなってしまうことを確実に防止できる。   Assuming that the three-way valve 78 is switched from the non-use condition of middle warm water to the use condition of middle warm water after the temperature of the middle warm water detected by the hot water storage temperature sensor 52 falls below the hot water supply set temperature, Due to temperature fluctuations, the temperature of the medium temperature water may exceed the hot water supply set temperature. In such a case, the temperature of the hot water supplied from the hot water supply mixing valve 22 to the hot water destination becomes higher than the hot water supply set temperature. On the other hand, in the present embodiment, the three-way valve 78 is switched from the non-use condition of middle warm water to the use condition of middle warm water until the temperature of the middle warm water becomes lower than the first reference temperature lower than the hot water supply set temperature. Do not switch. Therefore, even when the temperature of the middle portion of the hot water storage tank 8 tends to fluctuate, the temperature of the hot water supplied from the hot water supply mixing valve 22 to the hot water supply destination can be reliably prevented from becoming higher than the hot water supply set temperature. .

低温水の流入を想定した第二待機位置は、中温水の流入を想定した第一待機位置に比べて、高温水の混合割合が高くなる位置になる。すなわち、第二待機位置では、給湯用混合弁２２の高温側入口に連通する開口面積が、第一待機位置に比べて、大きくなる。   The second standby position assuming the inflow of the low temperature water is a position where the mixing ratio of the high temperature water is higher than the first standby position assuming the inflow of the middle warm water. That is, in the second standby position, the opening area communicating with the high temperature side inlet of the hot water supply mixing valve 22 is larger than that in the first standby position.

本実施の形態では、上述したステップＳ１４及びステップＳ１５のように、三方弁７８を中温水非利用状態から中温水利用状態に切り替える前に、給湯用混合弁２２を第二待機位置から第一待機位置へ作動させる。これとは逆に、三方弁７８を中温水非利用状態から中温水利用状態に切り替えた後に、給湯用混合弁２２を第二待機位置から第一待機位置へ作動させた仮定すると、以下のような可能性がある。三方弁７８が切り替わる途中で給湯が開始された場合には、高温水の混合割合が高い第二待機位置にある給湯用混合弁２２の低温側入口に中温水が流入する可能性がある。そのような場合、給湯用混合弁２２からの給湯温度が、一時的に、給湯設定温度より高くなる。シャワーのように、人体に直接湯を浴びる用途を想定すると、給湯温度が給湯設定温度より高くなる状態の発生は極力避けることが望ましい。これに対し、本実施の形態であれば、高温水の混合割合が低い第一待機位置に給湯用混合弁２２を切り替えた後に、三方弁７８を中温水利用状態へ切り替えるので、三方弁７８が切り替わる途中で給湯が開始された場合であっても、給湯用混合弁２２からの給湯温度が給湯設定温度より高くなることを確実に防止できる。   In the present embodiment, as in step S14 and step S15 described above, before switching the three-way valve 78 from the middle warm water non-use state to the middle warm water use state, the hot water supply mixing valve 22 is first standby from the second standby position. Actuate to position. Conversely, assuming that the hot water supply mixing valve 22 is operated from the second standby position to the first standby position after switching the three-way valve 78 from the middle warm water non-use state to the middle warm water use state, it is as follows: There is a possibility. When hot water supply is started while the three-way valve 78 is switched, middle warm water may flow into the low temperature side inlet of the hot water supply mixing valve 22 at the second standby position where the mixing ratio of high temperature water is high. In such a case, the hot water supply temperature from the hot water supply mixing valve 22 temporarily becomes higher than the hot water supply set temperature. Assuming an application where the human body is directly exposed to hot water, such as a shower, it is desirable to avoid the occurrence of a state in which the hot water supply temperature is higher than the hot water supply set temperature as much as possible. On the other hand, in the case of the present embodiment, after switching the hot water supply mixing valve 22 to the first standby position where the mixing ratio of the high temperature water is low, the three way valve 78 is switched to the middle warm water utilization state. Even when the hot water supply is started while switching, the hot water supply temperature from the hot water supply mixing valve 22 can be reliably prevented from becoming higher than the hot water supply set temperature.

現在の三方弁７８が中温水利用状態であるステップＳ１６では、ステップＳ１１で検出された中温水の温度が、第二基準温度に比べて高いか否かを判定する。第二基準温度は、給湯用混合弁２２の給湯先に対する給湯設定温度より低く、かつ第一基準温度より高い温度である。第二基準温度は、当該給湯設定温度に比べて、上記第一温度差より小さい所定の第二温度差だけ低い温度でもよい。当該第二温度差は、例えば、６℃でもよい。中温水の温度が第二基準温度に等しいか第二基準温度を超える場合に、中温水の温度が第二基準温度に比べて高い、と判定してもよい。   In step S16 in which the current three-way valve 78 is in the middle water use state, it is determined whether the temperature of the middle water detected in step S11 is higher than the second reference temperature. The second reference temperature is lower than the hot water supply set temperature for the hot water supply destination of the hot water supply mixing valve 22 and higher than the first reference temperature. The second reference temperature may be a temperature lower by a predetermined second temperature difference smaller than the first temperature difference, as compared to the hot water supply set temperature. The second temperature difference may be, for example, 6 ° C. When the temperature of the middle warm water is equal to or exceeds the second reference temperature, it may be determined that the temperature of the middle warm water is higher than the second reference temperature.

中温水の温度が第二基準温度に比べて高くない場合には、三方弁７８を中温水利用状態から中温水非利用状態へ切り替えることなく、ステップＳ１６の後、ルーチンを終了する。中温水の温度が第二基準温度に比べて高い場合には、ステップＳ１６からステップＳ１７へ移行する。ステップＳ１７では、三方弁７８を中温水利用状態から中温水非利用状態へ切り替える。すなわち、三方弁７８を、ｂポート−ｃポート間を導通する状態から、ａポート−ｃポート間を導通する状態へ切り替える。ステップＳ１７からステップＳ１８へ移行する。ステップＳ１８では、給湯用混合弁２２の待機位置が第一待機位置から第二待機位置へ変化するように、給湯用混合弁２２を作動させる。ステップＳ１８の後、ルーチンを終了する。   If the temperature of the medium temperature water is not higher than the second reference temperature, the routine is ended after step S16 without switching the three-way valve 78 from the medium temperature water utilization state to the medium water temperature nonuse state. If the temperature of the medium-temperature water is higher than the second reference temperature, the process proceeds from step S16 to step S17. In step S17, the three-way valve 78 is switched from the middle warm water utilization state to the middle warm water nonuse state. That is, the three-way valve 78 is switched from the state where the b port and the c port are electrically connected to the state where the a port and the c port are electrically connected. The process proceeds from step S17 to step S18. In step S18, the hot water supply mixing valve 22 is operated so that the standby position of the hot water supply mixing valve 22 changes from the first standby position to the second standby position. After step S18, the routine ends.

第二基準温度が第一基準温度に等しいと仮定すると、以下のようになる。貯湯温度センサ５２の分解能が小さい場合、あるいは貯湯タンク８の中間部の温度変動が大きい貯湯タンク８の状態である場合には、貯湯温度センサ５２で検出した中温水の温度が変動することで、三方弁７８の頻繁な切り替えが発生し、その結果、給湯温度の変動が大きくなる可能性がある。これに対し、本実施の形態であれば、第二基準温度を第一基準温度より高くしたことで、ステップＳ１５またはステップＳ１８による三方弁７８の切り替えが行われた後、次の三方弁７８の切り替え条件が成立しにくくなる。それゆえ、三方弁７８の頻繁な切り替えの発生を防止でき、給湯温度の変動を確実に抑制できる。   Assuming that the second reference temperature is equal to the first reference temperature, the following occurs. When the resolution of the hot water storage temperature sensor 52 is small or when the temperature of the hot water storage tank 8 is large with the temperature fluctuation of the middle part of the hot water storage tank 8, the temperature of the middle warm water detected by the hot water storage temperature sensor 52 fluctuates, Frequent switching of the three-way valve 78 may occur, resulting in large fluctuations in the hot water supply temperature. On the other hand, in the case of the present embodiment, after switching of the three-way valve 78 in step S15 or step S18 is performed by setting the second reference temperature higher than the first reference temperature, Switching conditions are less likely to be met. Therefore, the occurrence of frequent switching of the three-way valve 78 can be prevented, and fluctuations in the temperature of the hot water supply can be reliably suppressed.

本実施の形態では、中温水の温度が、給湯設定温度より低い第二基準温度に比べて高い場合には、三方弁７８を中温水利用状態から中温水非利用状態へ切り替えるので、中温水が給湯に利用されないようになる。仮に、中温水の温度が第二基準温度に比べて高い場合であって中温水の温度が給湯設定温度より少し低い場合に、中温水と高温水とを混合した湯を給湯先へ供給すると、以下のような問題がある。中温水の温度が給湯設定温度より少し低い温度の場合には、中温水に少量の高温水を混合して給湯先へ供給することになる。そのような場合に、中温水の温度が急激に変動すると、中温水の温度変動とほとんど同じ大きさの温度変動が給湯温度に生じてしまい、給湯温度に大きい変動が生じる。中温水の温度が給湯設定温度より少し高い場合に中温水に少量の低温水を混合して給湯先へ供給すると仮定した場合にも、同じようにして、給湯温度に大きい変動が生じる可能性がある。これに対し、本実施の形態では、中温水の温度が、給湯設定温度より低い第二基準温度に比べて高い場合には、中温水を給湯に利用しないようにすることで、給湯温度の変動を確実に抑制できる。   In the present embodiment, when the temperature of the medium temperature water is higher than the second reference temperature lower than the hot water supply setting temperature, the three-way valve 78 is switched from the medium temperature use condition to the medium temperature nonuse condition. It will not be used for hot water supply. If the temperature of the medium temperature water is higher than the second reference temperature and the temperature of the medium temperature water is slightly lower than the hot water supply set temperature, if the hot water obtained by mixing the medium temperature water and the high temperature water is supplied to the hot water supply destination, There are the following problems. When the temperature of the middle warm water is a temperature slightly lower than the hot water supply set temperature, the middle warm water is mixed with a small amount of high temperature water and supplied to the hot water supply destination. In such a case, when the temperature of the middle warm water fluctuates rapidly, a temperature fluctuation of almost the same magnitude as the temperature fluctuation of the middle warm water occurs in the hot water supply temperature, and a large fluctuation occurs in the hot water supply temperature. Even if it is assumed that the middle warm water is mixed with a small amount of low temperature water and supplied to the hot water supply destination when the middle warm water temperature is slightly higher than the hot water supply set temperature, a large fluctuation in the hot water supply temperature may occur similarly is there. On the other hand, in the present embodiment, when the temperature of the middle warm water is higher than the second reference temperature lower than the hot water supply set temperature, the middle hot water is not used for the hot water supply, thereby changing the hot water supply temperature. Can be reliably suppressed.

本実施の形態では、上述したステップＳ１７及びステップＳ１８のように、三方弁７８を中温水利用状態から中温水非利用状態に切り替えた後に、給湯用混合弁２２を第一待機位置から第二待機位置へ作動させる。これとは逆に、給湯用混合弁２２を第一待機位置から第二待機位置へ作動させた後に、三方弁７８を中温水利用状態から中温水非利用状態に切り替えると仮定すると、以下のような可能性がある。給湯用混合弁２２が第二待機位置へ切り替わった後、三方弁７８が切り替わる前に給湯が開始された場合には、高温水の混合割合が高い第二待機位置にある給湯用混合弁２２の低温側入口に中温水が流入する可能性がある。そのような場合、給湯用混合弁２２からの給湯温度が、一時的に、給湯設定温度より高くなる。これに対し、本実施の形態であれば、給湯用混合弁２２より先に三方弁７８を切り替えることで、高温水の混合割合が高い第二待機位置にある給湯用混合弁２２の低温側入口に中温水が流入することを確実に防止できる。よって、給湯用混合弁２２からの給湯温度が給湯設定温度より高くなることを確実に防止できる。   In the present embodiment, as in step S17 and step S18 described above, after the three-way valve 78 is switched from the use condition of middle warm water to the use condition of middle warm water, the hot water supply mixing valve 22 is switched from the first standby position to the second standby state. Actuate to position. Contrary to this, assuming that the three-way valve 78 is switched from the use of the medium warm water to the use of the medium warm water after the hot water supply mixing valve 22 is operated from the first standby position to the second standby position, There is a possibility. If the hot water supply is started before the three-way valve 78 switches after the hot water supply mixing valve 22 is switched to the second standby position, the hot water mixing valve 22 in the second standby position where the mixing ratio of high temperature water is high. Middle warm water may flow into the low temperature side inlet. In such a case, the hot water supply temperature from the hot water supply mixing valve 22 temporarily becomes higher than the hot water supply set temperature. On the other hand, in the case of the present embodiment, by switching the three-way valve 78 earlier than the hot water supply mixing valve 22, the low temperature side inlet of the hot water supply mixing valve 22 in the second standby position where the mixing ratio of high temperature water is high. It is possible to reliably prevent the inflow of medium-temperature water. Therefore, it can be reliably prevented that the hot water supply temperature from the hot water supply mixing valve 22 becomes higher than the hot water supply set temperature.

第一基準温度及び第二基準温度を高くすると、中温水を給湯に利用する機会が増加するので、貯湯式給湯システム３５のエネルギー効率がさらに向上する。例えば、前述した第一温度差（例えば８℃）及び第二温度差（例えば６℃）の値を縮小することで、第一基準温度及び第二基準温度が高くなる。その一方で、第一基準温度及び第二基準温度を高くすると、給湯温度の変動は多少増加する傾向がある。   When the first reference temperature and the second reference temperature are increased, the opportunity to use middle warm water for hot water supply increases, so the energy efficiency of the hot water storage type hot water supply system 35 is further improved. For example, by reducing the values of the first temperature difference (for example, 8 ° C.) and the second temperature difference (for example, 6 ° C.) described above, the first reference temperature and the second reference temperature become higher. On the other hand, when the first reference temperature and the second reference temperature are increased, the fluctuation of the hot water supply temperature tends to increase somewhat.

貯湯式給湯システム３５は、第一運転モードと、第一運転モードに比べてエネルギー効率の向上を優先する運転モードである第二運転モードとをユーザーが選択して設定可能にする手段を備えてもよい。第一運転モードは、例えば、通常の運転モードでもよい。第二運転モードの名称は、いかなる名称でもよく、例えば、省エネモード、節電モードなどでもよい。ユーザーがリモコン４４を操作することで、第一運転モードと第二運転モードとを選択して設定可能であってもよい。制御装置３６は、第二運転モードが設定されている場合にはそうでない場合に比べて、第一基準温度及び第二基準温度の値を高くしてもよい。第一基準温度及び第二基準温度の値を高くすることで、貯湯式給湯システム３５のエネルギー効率がさらに向上するので、第二運転モードを選択したユーザーの意向に沿うことができる。   The hot water storage type hot water supply system 35 includes means for enabling the user to select and set the first operation mode and the second operation mode which is an operation mode in which the improvement of energy efficiency is given priority over the first operation mode. It is also good. The first operation mode may be, for example, a normal operation mode. The name of the second operation mode may be any name, such as an energy saving mode or a power saving mode. The user may operate the remote control 44 to select and set the first operation mode and the second operation mode. The controller 36 may increase the values of the first reference temperature and the second reference temperature when the second operation mode is set as compared to when the second operation mode is not set. By raising the values of the first reference temperature and the second reference temperature, the energy efficiency of the hot water storage type hot water supply system 35 is further improved, so that the intention of the user who has selected the second operation mode can be met.

三方弁７８を、中温水非利用状態から中温水利用状態へ、あるいは中温水利用状態から中温水非利用状態へ、切り替えた後の給湯では、水配管１９の温度が、低温水の温度から中温水の温度へ急に上昇したり、あるいは中温水の温度から低温水の温度へ急に低下したりする。水配管１９の温度が安定するまでの間は、給湯温度が多少変動する可能性がある。このような状況における給湯温度の変動をより確実に抑制するために、以下のようにしてもよい。   In the hot water supply after switching the three-way valve 78 from the middle warm water nonuse state to the middle warm water use state or from the middle warm water use state to the middle warm water nonuse state, the temperature of the water pipe 19 is from the low temperature water temperature to the middle The temperature of the warm water rises rapidly, or the temperature of the middle warm water drops to the temperature of the low temperature water. Until the temperature of the water pipe 19 stabilizes, the temperature of the hot water supply may fluctuate somewhat. In order to more reliably suppress the fluctuation of the hot water supply temperature in such a situation, the following may be performed.

制御装置３６は、三方弁７８を、中温水非利用状態から中温水利用状態へ、あるいは中温水利用状態から中温水非利用状態へ、切り替えた後に給湯する初期の段階では、その後の段階に比べて、給湯用混合弁２２に対する制御時間間隔を短くしてもよい。例えば、制御装置３６は、三方弁７８が切り替えた後に給湯する初期の段階では、通常時に比べて、給湯用混合弁２２に対する制御時間間隔を短くしてもよい。三方弁７８が切り替えた後に給湯する初期の段階は、上記の理由から、多少の給湯温度の変動が発生しやすい段階になる。当該段階において、給湯用混合弁２２に対する制御時間間隔を短くすることで、給湯温度が変動することをより確実に抑制できる。   At the initial stage of hot water supply after switching the three-way valve 78 from the middle warm water non-use state to the middle warm water use state or from the middle warm water use state to the middle warm water non-use state, the control device 36 compares the subsequent stages. Alternatively, the control time interval for the hot water supply mixing valve 22 may be shortened. For example, at an initial stage of supplying water after the three-way valve 78 is switched, the control device 36 may shorten the control time interval for the hot water supply mixing valve 22 compared to the normal time. The initial stage of supplying water after switching of the three-way valve 78 is a stage where some fluctuations in the temperature of the hot water supply are likely to occur, for the reasons described above. By shortening the control time interval for the hot water supply mixing valve 22 at this stage, fluctuations in the hot water supply temperature can be more reliably suppressed.

ここで、制御時間間隔とは、給湯が行われている状態において、給湯用混合弁２２の高温側入口に連通する開口面積及び低温側入口に連通する開口面積の変更が終了し、それらの開口面積の次の変更が開始するまでの時間間隔のことを指す。以下の説明では、給湯用混合弁２２の高温側入口に連通する開口面積及び低温側入口に連通する開口面積を総称して単に「開口面積」と呼ぶ。給湯温度センサ５１で検出した給湯温度と給湯設定温度とに差がある場合、制御装置３６は、その差分から、給湯用混合弁２２の最適開口面積を算出し、その開口面積となるように給湯用混合弁２２を制御する。制御装置３６は、給湯用混合弁２２の開口面積の変更が終了し、制御時間間隔だけ待機した後、再び給湯用混合弁２２の最適開口面積を算出し、給湯用混合弁２２を制御する。制御時間間隔を設けることにより、給湯用混合弁２２の開口面積の変更による給湯温度の変化を給湯温度センサ５１で確実に検出することができ、不要な給湯用混合弁２２の制御及び給湯温度のハンチングを抑制することができる。   Here, with the control time interval, the change of the opening area communicating with the high temperature side inlet of the mixing valve 22 for hot water supply and the opening area communicating with the low temperature side inlet is completed in the state where the hot water supply is performed. It refers to the time interval before the next change of area starts. In the following description, the opening area communicating with the high temperature side inlet of the mixing valve for hot water supply 22 and the opening area communicating with the low temperature side inlet are collectively referred to simply as “opening area”. When there is a difference between the hot water supply temperature detected by the hot water supply temperature sensor 51 and the hot water supply set temperature, the control device 36 calculates the optimum opening area of the hot water supply mixing valve 22 from the difference and supplies the hot water so as to be the opening area. Control the mixing valve 22. After the change of the opening area of the hot water supply mixing valve 22 is completed and the control device 36 stands by for the control time interval, the control device 36 again calculates the optimum open area of the hot water supply mixing valve 22 and controls the hot water supply mixing valve 22. By providing the control time interval, it is possible to reliably detect the change of the hot water supply temperature due to the change of the opening area of the hot water supply mixing valve 22, and control of the unnecessary hot water supply mixing valve 22 and the hot water supply temperature Hunting can be suppressed.

この制御時間間隔については、給湯用混合弁２２の出口から給湯温度センサ５１までの容積、あるいは給湯流量等のパラメータによって、最適な制御時間間隔は異なる。給湯流量は、ユーザー次第であり、使用シーンによっても変化するものであるため、ノイズ因子として捉えることができる。給湯用混合弁２２の出口から給湯温度センサ５１までの容積がより小さくなるように設計することで、給湯温度の変動をさらに小さくすることが可能となる。給湯用混合弁２２の出口から給湯温度センサ５１までの容積が小さければ、給湯温度の変動に対する給湯流量のノイズ因子の影響は小さくなる。そのような場合、最適な制御時間間隔は、例えば、０．１秒程度になることがある。   With regard to this control time interval, the optimum control time interval differs depending on the volume from the outlet of the hot water supply mixing valve 22 to the hot water supply temperature sensor 51 or parameters such as the hot water supply flow rate. The hot-water supply flow rate depends on the user and changes depending on the use scene, and can be regarded as a noise factor. By designing so that the volume from the outlet of the mixing valve 22 for hot water supply to the hot water supply temperature sensor 51 becomes smaller, it is possible to further reduce the fluctuation of the hot water supply temperature. If the volume from the outlet of the mixing valve 22 for hot water supply to the hot water supply temperature sensor 51 is small, the influence of the noise factor of the hot water supply flow rate on the fluctuation of the hot water supply temperature becomes small. In such a case, the optimal control time interval may be, for example, about 0.1 second.

その一方で、給湯温度の変動が小さい状況である場合、特に給湯温度センサ５１の分解能が大きい場合には、制御時間間隔を短くしすぎると、ハンチングを引き起こす可能性がある。そのような場合には、最適な制御時間間隔は、例えば１．０秒程度になることがある。   On the other hand, if the variation of the hot water supply temperature is small, particularly if the resolution of the hot water supply temperature sensor 51 is large, hunting may be caused if the control time interval is too short. In such a case, the optimal control time interval may be, for example, about 1.0 second.

図２では、給湯用混合弁２２を用いた給湯に関する制御について説明した。本実施の形態では、ふろ用混合弁２３を用いた給湯に関して、図２と同様にして制御してもよい。また、本実施の形態では、給湯用混合弁２２及びふろ用混合弁２３の双方に関して、図２と同様にして制御してもよい。その場合、以下のようにしてもよい。給湯用混合弁２２の給湯先に対する給湯設定温度の値と、ふろ用混合弁２３の給湯先に対する給湯設定温度の値とが異なる場合には、図２のステップＳ１３及びステップＳ１６において、制御装置３６は、給湯用混合弁２２の給湯先に対する給湯設定温度と、ふろ用混合弁２３の給湯先に対する給湯設定温度とのうちの低い方の値に基づいて、第一基準温度及び前記第二基準温度を設定してもよい。そのようにすることで、給湯用混合弁２２の給湯先とふろ用混合弁２３の給湯先とのいずれについても、中温水を利用する給湯が可能となる。   In FIG. 2, the control relating to the hot water supply using the hot water supply mixing valve 22 has been described. In the present embodiment, hot water supply using the mixing valve 23 for bath may be controlled in the same manner as in FIG. Further, in the present embodiment, both of the hot water supply mixing valve 22 and the bottom mixing valve 23 may be controlled in the same manner as in FIG. In that case, the following may be performed. If the value of the hot water supply setting temperature for the hot water supply destination of the hot water supply mixing valve 22 and the value of the hot water supply setting temperature for the hot water supply destination of the bath mixing valve 23 are different from each other, the control device 36 in steps S13 and S16 of FIG. The first reference temperature and the second reference temperature are based on the lower one of the hot water supply set temperature for the hot water supply destination of the hot water supply mixing valve 22 and the hot water supply set temperature for the hot water supply destination of the bath mixing valve 23. May be set. By doing so, hot water supply using middle warm water becomes possible for any of the hot water supply destination of the hot water supply mixing valve 22 and the hot water supply destination of the bath mixing valve 23.

ふろ用混合弁２３の給湯先に対する給湯設定温度が、給湯用混合弁２２の給湯先に対する給湯設定温度より低い場合には、図２のステップＳ１３及びステップＳ１６において、前述した第一温度差及び第二温度差の値を小さくしてもよい。第一温度差及び第二温度差の値を小さくすることで、中温水をより多く利用できるので、エネルギー効率がさらに向上する。ふろ用混合弁２３の給湯先、すなわち浴槽３０に供給される湯は、直接人体に浴びる訳ではない。このため、図２のステップＳ１３及びステップＳ１６において、第一基準温度及び前記第二基準温度が、ふろ用混合弁２３の給湯先に対する給湯設定温度に近づくことで、ふろ用混合弁２３からの給湯温度が多少変動しやすくなっても、影響は少ない。   When the hot water supply setting temperature for the hot water supply destination of the mixing valve 23 for the bath is lower than the hot water supply setting temperature for the hot water supply destination of the mixing valve 22 for hot water supply, the first temperature difference and the first temperature difference described above in step S13 and step S16 of FIG. The value of the two temperature differences may be reduced. By reducing the values of the first temperature difference and the second temperature difference, more middle-class hot water can be used, and energy efficiency is further improved. The hot water supplied to the hot water supply destination of the bath mixing valve 23, that is, the hot water supplied to the bath 30, is not directly exposed to the human body. Therefore, in steps S13 and S16 of FIG. 2, when the first reference temperature and the second reference temperature approach the hot water supply set temperature for the hot water supply destination of the bath mixing valve 23, the hot water supply from the bath mixing valve 23 Even if the temperature tends to fluctuate a little, the effect is small.

前述したように、ふろ追焚き運転あるいはふろ排熱回収運転の実行中は、温水導入口８ｃから貯湯タンク８へ中温水が流入することで、貯湯タンク８内の貯湯水の温度分布が乱される。このため、中温配管７９へ流出する中温水の温度が変動しやすくなる。制御装置３６は、ふろ追焚き運転あるいはふろ排熱回収運転を実行するときには、三方弁７８を中温水非利用状態に切り替えて固定してもよい。中温水の温度が変動しやすい、ふろ追焚き運転あるいはふろ排熱回収運転の実行中は、中温水を利用しない給湯にすることで、給湯温度の変動をより確実に抑制できる。本実施の形態におけるふろ追焚き運転及びふろ排熱回収運転は、貯湯タンク８内から水を導出して貯湯タンク８内に戻す回路の水を循環させる運転の例である。   As described above, during execution of the chase refueling operation or the chute exhaust heat recovery operation, the middle warm water flows from the warm water inlet 8 c to the hot water storage tank 8, thereby disturbing the temperature distribution of the hot water in the hot water storage tank 8. Ru. For this reason, the temperature of the medium-temperature water flowing out to the medium-temperature pipe 79 is likely to fluctuate. The control device 36 may switch the three-way valve 78 to the non-use condition of the warm water and fix it when performing the chase operation or the chock exhaust heat recovery operation. During the execution of the chute-heating operation or the chute exhaust heat recovery operation, in which the temperature of the middle-warm water tends to fluctuate, it is possible to more reliably suppress the fluctuation of the hot-water supply temperature by using hot water not using the middle-warm water. The furo follow-up operation and the furo exhaust heat recovery operation in the present embodiment are examples of an operation of circulating water of a circuit which is led out of the hot water storage tank 8 and returned into the hot water storage tank 8.

貯湯式給湯機３５の制御装置３６、及びリモコン４４が備える制御装置、の各々は、以下のように構成されてもよい。制御装置の各機能は、処理回路により実現されてもよい。制御装置の処理回路は、少なくとも１つのプロセッサと少なくとも１つのメモリとを備えてもよい。処理回路が少なくとも１つのプロセッサと少なくとも１つのメモリとを備える場合、制御装置の各機能は、ソフトウェア、ファームウェア、またはソフトウェアとファームウェアとの組み合わせにより実現されてもよい。ソフトウェアおよびファームウェアの少なくとも一方は、プログラムとして記述されてもよい。ソフトウェアおよびファームウェアの少なくとも一方は、少なくとも１つのメモリに格納されてもよい。少なくとも１つのプロセッサは、少なくとも１つのメモリに記憶されたプログラムを読み出して実行することにより、制御装置の各機能を実現してもよい。少なくとも１つのメモリは、不揮発性または揮発性の半導体メモリ、磁気ディスク等を含んでもよい。   Each of the control device 36 of the hot water storage type water heater 35 and the control device included in the remote control 44 may be configured as follows. Each function of the control device may be realized by a processing circuit. The processing circuitry of the controller may comprise at least one processor and at least one memory. When the processing circuit includes at least one processor and at least one memory, each function of the control device may be realized by software, firmware, or a combination of software and firmware. Software and / or firmware may be described as a program. The software and / or firmware may be stored in at least one memory. At least one processor may implement each function of the control device by reading and executing a program stored in at least one memory. At least one memory may include non-volatile or volatile semiconductor memory, magnetic disk, and the like.

制御装置の処理回路は、少なくとも１つの専用のハードウェアを備えてもよい。処理回路が少なくとも１つの専用のハードウェアを備える場合、処理回路は、例えば、単一回路、複合回路、プログラム化したプロセッサ、並列プログラム化したプロセッサ、ＡＳＩＣ（Ａｐｐｌｉｃａｔｉｏｎ Ｓｐｅｃｉｆｉｃ Ｉｎｔｅｇｒａｔｅｄ Ｃｉｒｃｕｉｔ）、ＦＰＧＡ（Ｆｉｅｌｄ−Ｐｒｏｇｒａｍｍａｂｌｅ Ｇａｔｅ Ａｒｒａｙ）、またはこれらを組み合わせたものでもよい。制御装置の各部の機能がそれぞれ処理回路で実現されても良い。また、制御装置の各部の機能がまとめて処理回路で実現されても良い。制御装置の各機能について、一部を専用のハードウェアで実現し、他の一部をソフトウェアまたはファームウェアで実現してもよい。処理回路は、ハードウェア、ソフトウェア、ファームウェア、またはこれらの組み合わせによって、制御装置の各機能を実現しても良い。   The processing circuitry of the controller may comprise at least one dedicated hardware. When the processing circuit comprises at least one dedicated hardware, the processing circuit may, for example, be a single circuit, a complex circuit, a programmed processor, a parallel programmed processor, an application specific integrated circuit (ASIC), an FPGA (field- It may be a programmable gate array) or a combination thereof. The function of each part of the control device may be realized by the processing circuit. In addition, the functions of the respective units of the control device may be realized collectively by the processing circuit. For each function of the control device, a part may be realized by dedicated hardware, and another part may be realized by software or firmware. The processing circuit may implement each function of the control device by hardware, software, firmware, or a combination thereof.

単一の制御装置により動作が制御される構成に限定されるものではなく、複数の制御装置が連携することで動作を制御する構成にしてもよい。   The configuration is not limited to a configuration in which the operation is controlled by a single control device, and a configuration in which a plurality of control devices cooperate to control the operation may be employed.

１ 圧縮機、 ３ 水冷媒熱交換器、 ４ 膨張弁、 ５ 冷媒配管、 ６ 空気熱交換器、 ７ ＨＰユニット、 ８ 貯湯タンク、 ８ａ 水導入口、 ８ｂ 水導出口、 ８ｃ 温水導入口、 ８ｄ 温水導入出口、 ８ｅ 温水導出口、 ８ｆ 中温導出口、 ９ａ 第１給水配管、 ９ｂ 第２給水配管、 ９ｃ 第３給水配管、 １０ａ 第１水導出口配管、 １０ｂ 第２水導出口配管、 １１ 第２四方弁、 １２ 循環ポンプ、 １３ 送湯配管、 １４ ＨＰ往き配管、 １５ ＨＰ戻り配管、 １６ 第１バイパス配管、 １７ 第２バイパス配管、 １８ 第１四方弁、 １９ 水配管、 ２０ 利用側熱交換器、 ２０ａ 第１温水導入配管、 ２０ｂ 第２温水導入配管、 ２１ 高温配管、 ２２ 給湯用混合弁、 ２３ ふろ用混合弁、 ２４ 第１給湯配管、 ２５ 第２給湯配管、 ２６ ふろ用電磁弁、 ２７ ふろ往き配管、 ２８ ふろ戻り配管、 ２９ ふろ循環ポンプ、 ３０ 浴槽、 ３１ 減圧弁、 ３３ タンクユニット、 ３４ 給湯栓、 ３５ 貯湯式給湯システム、 ３６ 制御装置、 ３７ ふろ往き温度センサ、 ３８ ふろ戻り温度センサ、 ３９ ＨＰ出湯温度センサ、 ４０ ＨＰ入水温度センサ、 ４２，４３，５２ 貯湯温度センサ、 ４４ リモコン、 ４５ ふろ用流量センサ、 ４８ 給湯用流量センサ、 ５０ 給水温度センサ、 ５１ 給湯温度センサ、 ７８ 三方弁、 ７９ 中温配管 1 compressor, 3 water refrigerant heat exchangers, 4 expansion valves, 5 refrigerant pipes, 6 air heat exchangers, 7 HP units, 8 hot water storage tanks, 8a water inlet, 8b water outlet, 8c hot water inlet, 8d hot water Introduction outlet, 8e hot water outlet, 8f medium temperature outlet, 9a first water supply piping, 9b second water supply piping, 9c third water supply piping, 10a first water outlet piping, 10b second water outlet piping, 11 second Four-way valve, 12 circulation pumps, 13 hot water delivery piping, 14 HP forward piping, 15 HP return piping, 16 first bypass piping, 17 second bypass piping, 18 first four-way valve, 19 water piping, 20 user side heat exchanger , 20a 1st hot water introduction piping, 20b 2nd hot water introduction piping, 21 high temperature piping, 22 mixing valves for hot water supply, 23 mixing valves for bath, 24 first hot water supply Pipe, 25 second hot water supply pipe, 26 solenoid valve for bath, 27 flow forward pipe, 28 flow return pipe, 29 bath circulation pump, 30 bath, 31 pressure reducing valve, 33 tank unit, 34 hot water supply valve, 35 hot water storage hot water supply system, 36 control unit, 37 flow temperature sensor, 38 flow return temperature sensor, 39 HP discharge temperature sensor, 40 HP incoming water temperature sensor, 42, 43, 52 hot water storage temperature sensor, 44 remote control, 45 flow sensor for flow, 48 flow rate for hot water supply Sensor, 50 water supply temperature sensor, 51 hot water supply temperature sensor, 78 three-way valve, 79 medium temperature piping

Claims (7)

貯湯タンクと、
前記貯湯タンクの上部に接続された高温配管と、
前記高温配管の接続位置より低い位置で前記貯湯タンクに接続された中温配管と、
前記高温配管から供給される高温水と、水源から供給される低温水または前記中温配管から供給される中温水とを混合することで、給湯先へ供給される湯を温度調節する少なくとも一つの混合手段と、
前記中温水が前記少なくとも一つの混合手段へ供給される流路状態である中温水利用状態と、前記低温水が前記少なくとも一つの混合手段へ供給される流路状態である中温水非利用状態とを切り替える流路切替手段と、
前記中温水の温度を検出する手段と、
前記少なくとも一つの混合手段及び前記流路切替手段を制御する手段と、
を備え、
給湯設定温度より低い温度である第一基準温度に比べて前記中温水の温度が低い場合には、前記流路切替手段を前記中温水利用状態へ切り替え、前記給湯設定温度より低く前記第一基準温度より高い温度である第二基準温度に比べて前記中温水の温度が高い場合には、前記流路切替手段を前記中温水非利用状態へ切り替え、
前記給湯先への給湯が停止中のときに前記流路切替手段の切り替えを許容し、前記給湯先への給湯が実行中のときには前記流路切替手段の切り替えを実施しない貯湯式給湯システム。 With a hot water storage tank,
High temperature piping connected to the upper part of the hot water storage tank,
Intermediate temperature piping connected to the hot water storage tank at a position lower than the connection position of the high temperature piping,
At least one of mixing the temperature of the hot water supplied to the hot water supply destination by mixing the high temperature water supplied from the high temperature pipe and the low temperature water supplied from the water source or the medium warm water supplied from the medium temperature pipe Means,
The medium warm water utilization state, which is a flow path state in which the middle warm water is supplied to the at least one mixing means, and the middle warm water nonuse state, which is a flow path state in which the low temperature water is supplied to the at least one mixing means Flow path switching means for switching the
A means for detecting the temperature of the middle warm water;
Means for controlling the at least one mixing means and the flow path switching means;
Equipped with
When the temperature of the middle warm water is lower than the first reference temperature which is lower than the hot water supply set temperature, the flow path switching unit is switched to the middle warm water utilization state, and the first standard lower than the hot water supply set temperature. When the temperature of the middle warm water is higher than a second reference temperature higher than the temperature, the flow path switching unit is switched to the middle warm water non-use state ,
A hot water storage type hot water supply system which permits switching of the flow path switching means when the hot water supply to the hot water supply destination is stopped, and does not switch the flow path switching means when the hot water supply to the hot water supply destination is in progress . 貯湯タンクと、
前記貯湯タンクの上部に接続された高温配管と、
前記高温配管の接続位置より低い位置で前記貯湯タンクに接続された中温配管と、
前記高温配管から供給される高温水と、水源から供給される低温水または前記中温配管から供給される中温水とを混合することで、給湯先へ供給される湯を温度調節する少なくとも一つの混合手段と、
前記中温水が前記少なくとも一つの混合手段へ供給される流路状態である中温水利用状態と、前記低温水が前記少なくとも一つの混合手段へ供給される流路状態である中温水非利用状態とを切り替える流路切替手段と、
前記中温水の温度を検出する手段と、
前記少なくとも一つの混合手段及び前記流路切替手段を制御する手段と、
を備え、
給湯設定温度より低い温度である第一基準温度に比べて前記中温水の温度が低い場合には、前記流路切替手段を前記中温水利用状態へ切り替え、前記給湯設定温度より低く前記第一基準温度より高い温度である第二基準温度に比べて前記中温水の温度が高い場合には、前記流路切替手段を前記中温水非利用状態へ切り替え、
前記流路切替手段が前記中温水利用状態で前記給湯先への給湯が停止中のときの前記少なくとも一つの混合手段は、第一待機位置にあり、
前記流路切替手段が前記中温水非利用状態で前記給湯先への給湯が停止中のときの前記少なくとも一つの混合手段は、第二待機位置にあり、
前記第二待機位置は、前記第一待機位置に比べて、前記高温水の混合割合が高くなる位置であり、
前記流路切替手段を前記中温水利用状態から前記中温水非利用状態へ切り替えた後に前記少なくとも一つの混合手段を前記第一待機位置から前記第二待機位置へ作動させる貯湯式給湯システム。 With a hot water storage tank,
High temperature piping connected to the upper part of the hot water storage tank,
Intermediate temperature piping connected to the hot water storage tank at a position lower than the connection position of the high temperature piping,
At least one of mixing the temperature of the hot water supplied to the hot water supply destination by mixing the high temperature water supplied from the high temperature pipe and the low temperature water supplied from the water source or the medium warm water supplied from the medium temperature pipe Means,
The medium warm water utilization state, which is a flow path state in which the middle warm water is supplied to the at least one mixing means, and the middle warm water nonuse state, which is a flow path state in which the low temperature water is supplied to the at least one mixing means Flow path switching means for switching the
A means for detecting the temperature of the middle warm water;
Means for controlling the at least one mixing means and the flow path switching means;
Equipped with
When the temperature of the middle warm water is lower than the first reference temperature which is lower than the hot water supply set temperature, the flow path switching unit is switched to the middle warm water utilization state, and the first standard lower than the hot water supply set temperature. When the temperature of the middle warm water is higher than a second reference temperature higher than the temperature, the flow path switching unit is switched to the middle warm water non-use state ,
The at least one mixing means is in a first standby position when the flow path switching means is in the middle warm water utilization state and the hot water supply to the hot water supply destination is stopped.
The at least one mixing means is in the second standby position when the flow path switching means is in the non-use condition of the middle warm water and the hot water supply to the hot water supply destination is stopped.
The second standby position is a position at which the mixing ratio of the high-temperature water is higher than that of the first standby position.
The hot water storage type hot-water supply system Ru is at least operated with one of the mixing means from the first standby position into the second standby position after switching the flow path switching unit from the warm water available state to the warm water non use state. 前記流路切替手段を前記中温水非利用状態から前記中温水利用状態へ切り替える前に前記少なくとも一つの混合手段を前記第二待機位置から前記第一待機位置へ作動させる請求項２に記載の貯湯式給湯システム。 The hot water storage according to claim 2 , wherein the at least one mixing means is operated from the second standby position to the first standby position before switching the flow path switching unit from the intermediate warm water non-use state to the intermediate warm water use state. Hot water supply system. 貯湯タンクと、
前記貯湯タンクの上部に接続された高温配管と、
前記高温配管の接続位置より低い位置で前記貯湯タンクに接続された中温配管と、
前記高温配管から供給される高温水と、水源から供給される低温水または前記中温配管から供給される中温水とを混合することで、給湯先へ供給される湯を温度調節する少なくとも一つの混合手段と、
前記中温水が前記少なくとも一つの混合手段へ供給される流路状態である中温水利用状態と、前記低温水が前記少なくとも一つの混合手段へ供給される流路状態である中温水非利用状態とを切り替える流路切替手段と、
前記中温水の温度を検出する手段と、
前記少なくとも一つの混合手段及び前記流路切替手段を制御する手段と、
第一運転モードに比べてエネルギー効率の向上を優先する運転モードである第二運転モードをユーザーが設定可能にする手段と、
を備え、
給湯設定温度より低い温度である第一基準温度に比べて前記中温水の温度が低い場合には、前記流路切替手段を前記中温水利用状態へ切り替え、前記給湯設定温度より低く前記第一基準温度より高い温度である第二基準温度に比べて前記中温水の温度が高い場合には、前記流路切替手段を前記中温水非利用状態へ切り替え、
前記第二運転モードが設定されている場合にはそうでない場合に比べて、前記第一基準温度及び前記第二基準温度の値を高くする貯湯式給湯システム。 With a hot water storage tank,
High temperature piping connected to the upper part of the hot water storage tank,
Intermediate temperature piping connected to the hot water storage tank at a position lower than the connection position of the high temperature piping,
At least one of mixing the temperature of the hot water supplied to the hot water supply destination by mixing the high temperature water supplied from the high temperature pipe and the low temperature water supplied from the water source or the medium warm water supplied from the medium temperature pipe Means,
The medium hot water utilization state, which is a flow path state where the middle warm water is supplied to the at least one mixing means, and the middle warm water nonuse state, which is a flow path state where the low temperature water is supplied to the at least one mixing means Flow path switching means for switching the
A means for detecting the temperature of the middle warm water;
Means for controlling the at least one mixing means and the flow path switching means;
A means for enabling the user to set a second operation mode, which is an operation mode in which priority is given to improvement of energy efficiency as compared with the first operation mode;
Equipped with
When the temperature of the middle warm water is lower than the first reference temperature which is lower than the hot water supply set temperature, the flow path switching unit is switched to the middle warm water utilization state, and the first standard lower than the hot water supply set temperature. When the temperature of the middle warm water is higher than a second reference temperature higher than the temperature, the flow path switching unit is switched to the middle warm water non-use state ,
When said second operation mode is set than otherwise, the hot-water storage type hot-water supply system that increases the value of the first reference temperature and the second reference temperature. 貯湯タンクと、
前記貯湯タンクの上部に接続された高温配管と、
前記高温配管の接続位置より低い位置で前記貯湯タンクに接続された中温配管と、
前記高温配管から供給される高温水と、水源から供給される低温水または前記中温配管から供給される中温水とを混合することで、給湯先へ供給される湯を温度調節する少なくとも一つの混合手段と、
前記中温水が前記少なくとも一つの混合手段へ供給される流路状態である中温水利用状態と、前記低温水が前記少なくとも一つの混合手段へ供給される流路状態である中温水非利用状態とを切り替える流路切替手段と、
前記中温水の温度を検出する手段と、
前記少なくとも一つの混合手段及び前記流路切替手段を制御する手段と、
を備え、
給湯設定温度より低い温度である第一基準温度に比べて前記中温水の温度が低い場合には、前記流路切替手段を前記中温水利用状態へ切り替え、前記給湯設定温度より低く前記第一基準温度より高い温度である第二基準温度に比べて前記中温水の温度が高い場合には、前記流路切替手段を前記中温水非利用状態へ切り替え、
前記貯湯タンク内から水を導出して前記貯湯タンク内に戻す回路の水を循環させる運転を実行するときには、前記流路切替手段を前記中温水非利用状態へ切り替える貯湯式給湯システム。 With a hot water storage tank,
High temperature piping connected to the upper part of the hot water storage tank,
Intermediate temperature piping connected to the hot water storage tank at a position lower than the connection position of the high temperature piping,
At least one of mixing the temperature of the hot water supplied to the hot water supply destination by mixing the high temperature water supplied from the high temperature pipe and the low temperature water supplied from the water source or the medium warm water supplied from the medium temperature pipe Means,
The medium hot water utilization state, which is a flow path state where the middle warm water is supplied to the at least one mixing means, and the middle warm water nonuse state, which is a flow path state where the low temperature water is supplied to the at least one mixing means Flow path switching means for switching the
A means for detecting the temperature of the middle warm water;
Means for controlling the at least one mixing means and the flow path switching means;
Equipped with
When the temperature of the middle warm water is lower than the first reference temperature which is lower than the hot water supply set temperature, the flow path switching unit is switched to the middle warm water utilization state, and the first standard lower than the hot water supply set temperature. When the temperature of the middle warm water is higher than a second reference temperature higher than the temperature, the flow path switching unit is switched to the middle warm water non-use state ,
The hot water storage derives water from the tank when performing the operation for circulating the water in the circuit back into the hot water storage tank is toggle its hot water storage type hot-water supply system the channel switching means to the warm water non use state. 前記流路切替手段を切り替えた後に前記給湯先へ給湯する初期の段階では、その後の段階に比べて、前記少なくとも一つの混合手段に対する制御時間間隔を短くする請求項１から請求項５のいずれか一項に記載の貯湯式給湯システム。 In the early stages of the hot water to the hot water supply destination after switching the flow path switching unit, compared to a later stage, one of claims 1 to 5 to reduce the control time interval for the at least one mixing means A hot water storage type hot water supply system according to one item. 前記少なくとも一つの混合手段は、第一混合手段及び第二混合手段を含み、
前記第一混合手段の給湯先への給湯設定温度と、前記第二混合手段の給湯先への給湯設定温度とのうちの低い方の値に基づいて、前記第一基準温度及び前記第二基準温度が設定される請求項１から請求項６のいずれか一項に記載の貯湯式給湯システム。 The at least one mixing means comprises a first mixing means and a second mixing means,
The first reference temperature and the second reference based on the lower one of the hot water supply set temperature for the hot water supply destination of the first mixing means and the hot water supply set temperature for the hot water supply destination of the second mixing means The hot water storage type hot water supply system according to any one of claims 1 to 6, wherein a temperature is set.
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