JP6616927B2 - Heat pump type water heater - Google Patents

Heat pump type water heater Download PDF

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JP6616927B2
JP6616927B2 JP2016067464A JP2016067464A JP6616927B2 JP 6616927 B2 JP6616927 B2 JP 6616927B2 JP 2016067464 A JP2016067464 A JP 2016067464A JP 2016067464 A JP2016067464 A JP 2016067464A JP 6616927 B2 JP6616927 B2 JP 6616927B2
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hot water
temperature
heating
water storage
storage tank
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JP2017180934A (en
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泰弘 石橋
誠 森田
基 阿部
勝 佐々木
大一郎 佐藤
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Corona Corp
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本発明はヒートポンプ式加熱手段により湯を沸き上げてこれを貯湯するヒートポンプ式給湯装置に関するものである。   The present invention relates to a heat pump type hot water supply apparatus for boiling hot water by a heat pump type heating means and storing the hot water.

従来よりこの種のヒートポンプ式給湯装置では、ヒートポンプ式加熱手段の水冷媒熱交換器で貯湯タンク下部から供給される水を目標沸き上げ温度となるように加熱するもので、水冷媒熱交換器で加熱された湯を貯湯タンク上部に戻すか、貯湯タンク下部へ戻すかを切り替えるバイパス切替弁を有し、沸き上げ開始時は、水冷媒熱交換器から流出する沸き上げられた湯の温度である沸き上げ温度が所定の切替温度に達するまでは、沸き上げた湯を貯湯タンク下部に戻し、沸き上げ温度が所定の切替温度以上になると、沸き上げた湯を貯湯タンク上部に戻すように、バイパス切替弁を切り替えるようにして、沸き上げ開始時の低温の湯水が貯湯タンクの上部へ流入して貯湯タンク上部の温度を降下してしまうのを抑制している。   Conventionally, in this type of heat pump type hot water supply apparatus, water supplied from the lower part of the hot water storage tank is heated by the water refrigerant heat exchanger of the heat pump type heating means so as to reach the target boiling temperature. It has a bypass switching valve that switches whether heated water is returned to the upper part of the hot water tank or returned to the lower part of the hot water tank. At the start of boiling, it is the temperature of the heated water that flows out of the water-refrigerant heat exchanger. Until the boiling temperature reaches the specified switching temperature, return the heated water to the lower part of the hot water storage tank, and when the boiling temperature exceeds the predetermined switching temperature, bypass the heated water to the upper part of the hot water storage tank. By switching the switching valve, it is possible to suppress the low temperature hot water at the start of boiling from flowing into the upper part of the hot water tank and lowering the temperature of the upper part of the hot water tank.

このバイパス切替弁を切り替える所定の切替温度は、特許文献１に開示されているように、貯湯タンク上部の貯湯温度に基づいて定められ、沸き上げ温度が貯湯タンク上部の貯湯温度以上となるとバイパス切替弁を貯湯タンク上部側に切り替えるようにしているものがあった。   The predetermined switching temperature for switching the bypass switching valve is determined based on the hot water storage temperature at the upper part of the hot water storage tank as disclosed in Patent Document 1, and bypass switching is performed when the boiling temperature is equal to or higher than the hot water storage temperature at the upper part of the hot water storage tank. There was one that switched the valve to the hot water tank upper side.

また、特許文献２に開示されているように、バイパス切替弁を切り替える所定の切替温度を目標沸き上げ温度に応じて定め、目標沸き上げ温度が高いほど高い温度に設定されているものがあった。   Further, as disclosed in Patent Document 2, a predetermined switching temperature for switching the bypass switching valve is determined in accordance with the target boiling temperature, and there is one that is set to a higher temperature as the target boiling temperature is higher. .

特開２００３−２７９１３６号公報JP 2003-279136 A 特開２００９−２６４６１７号公報JP 2009-264617 A

ところが、この従来の特許文献１のものでは、バイパス切替弁を切り替えるまでは貯湯タンク下部に中温〜高温の湯が戻るため、貯湯タンク上部の貯湯温度の低下は抑制されるものの、貯湯タンク下部の貯湯温度が上昇し、ヒートポンプ式加熱手段での沸き上げ効率が低下するという問題があった。   However, in this conventional Patent Document 1, since the hot water of medium temperature to high temperature returns to the lower part of the hot water tank until the bypass switching valve is switched, the decrease in the hot water temperature in the upper part of the hot water tank is suppressed, but There was a problem that the hot water storage temperature rose and the boiling efficiency in the heat pump heating means was lowered.

ここで、比較的少ない使用湯量で安定して使用している使用状況においては、省エネルギーを意識した給湯を行っていると考えられるため、貯湯タンク上部の貯湯温度低下による貯湯量の減少よりも、ヒートポンプ式加熱手段での沸き上げ効率が低下することの方が問題となる。   Here, in the usage situation that is stably used with a relatively small amount of hot water used, it is considered that hot water supply is conscious of energy saving, so rather than a decrease in the amount of hot water stored due to a decrease in hot water temperature at the top of the hot water tank, The problem is that the boiling efficiency of the heat pump heating means is lowered.

一方、従来の特許文献２のものでは、目標沸き上げ温度が低い場合（例えば７０℃）にバイパス切替弁を切り替える所定温度を目標沸き上げ温度が高い場合より低い温度（例えば５０℃）としてしまうと、貯湯タンク下部の貯湯温度の上昇は抑制されるものの、貯湯タンク上部に比較的高い温度（例えば６０℃）の湯が残っている場合に、貯湯タンク上部の湯温を下げてしまう虞がある。   On the other hand, in the conventional patent document 2, when the target boiling temperature is low (for example, 70 ° C.), the predetermined temperature for switching the bypass switching valve is set to a lower temperature (for example, 50 ° C.) than when the target boiling temperature is high. Although the rise in hot water temperature at the lower part of the hot water storage tank is suppressed, there is a risk that the hot water temperature at the upper part of the hot water storage tank may be lowered when hot water at a relatively high temperature (for example, 60 ° C.) remains in the upper part of the hot water storage tank. .

ここで、日々の使用湯量の変動が大きいような使用状況においては、ユーザーが省エネルギーを意識した給湯を行っていないことが考えられるため、ヒートポンプ式加熱手段での沸き上げ効率の低下よりも、貯湯タンク内の湯の温度が下がることにより湯切れしてしまうことの方が問題となる。   Here, in situations where daily hot water usage fluctuates greatly, it is considered that the user is not supplying hot water with an awareness of energy conservation. Therefore, rather than a decrease in boiling efficiency with the heat pump heating means, The problem is that the hot water runs out when the temperature of the hot water in the tank drops.

このように、ヒートポンプ式給湯装置においては、貯湯タンク上部の温度を下げたくない状況と、貯湯タンク下部の温度を上げたくない状況とが存在するが、従来のものでは、何れか一方の状況にしか対応できないものであった。   As described above, in the heat pump type hot water supply apparatus, there are a situation where it is not desired to lower the temperature of the hot water storage tank and a situation where it is not desired to raise the temperature of the hot water storage tank. It was only possible to cope.

本発明は上記課題を解決するために、湯水を貯湯する貯湯タンクと、前記貯湯タンク内の湯水を沸き上げ設定温度に加熱して前記貯湯タンクに積層状に貯湯する沸き上げ運転を行うヒートポンプ式加熱手段と、前記貯湯タンク下部と前記ヒートポンプ式加熱手段の入口側とを接続する加熱往き管と、前記ヒートポンプ式加熱手段の出口側と前記貯湯タンク上部とを接続する加熱戻り管と、前記加熱戻り管から分岐されて前記貯湯タンク下部に接続される分岐管と、前記ヒートポンプ式加熱手段からの湯を前記貯湯タンク上部に戻すか、前記分岐管を介して前記貯湯タンク下部に戻すかを切り替える切替手段と、前記加熱戻り管に設けられ前記ヒートポンプ式加熱手段で加熱された湯水の温度を検出する沸き上げ温度センサと、前記沸き上げ運転の開始からの時間経過に伴い前記沸き上げ温度センサで検出した温度が所定の切替温度以上となると、前記切替手段を前記貯湯タンク下部側から前記貯湯タンク上部側に切り替える切替制御手段と、過去複数日間の使用湯量を日毎に記憶する使用湯量記憶手段と、前記使用湯量記憶手段に記憶されている情報に基づいて使用状況を判断する使用状況判断手段と、を備え、前記使用状況判断手段は、前記使用湯量記憶手段に記憶されている情報から使用湯量のバラツキ度合の値を算出し、前記バラツキ度合の値が所定値未満の場合に前記沸き上げ効率を優先する使用状況であると判断し、前記バラツキ度合の値が所定値以上の場合に前記高温の湯の確保を優先する使用状況であると判断するようにし、前記切替制御手段は、前記使用状況判断手段の判断結果に基づいて、前記沸き上げ効率を優先する使用状況であると、前記高温の湯の確保を優先する使用状況であるときに比べて前記所定の切替温度を低い温度に決定するようにした。 In order to solve the above-mentioned problems, the present invention provides a hot water storage tank for storing hot water, and a heat pump type for performing a heating operation in which hot water in the hot water storage tank is heated to a set temperature and heated in a stacked manner in the hot water storage tank. Heating means, a heating forward pipe connecting the lower part of the hot water storage tank and the inlet side of the heat pump type heating means, a heating return pipe connecting the outlet side of the heat pump type heating means and the upper part of the hot water storage tank, and the heating A branch pipe branched from a return pipe and connected to the lower part of the hot water storage tank and switching between returning the hot water from the heat pump heating means to the upper part of the hot water storage tank or returning to the lower part of the hot water storage tank via the branch pipe a switching unit, a boiling temperature sensor detects the heated hot water temperature at the heat-pump type heating means provided in the heating return pipe, said boiling luck If the temperature detected by the water heating temperature sensor with the lapse of time from the start of greater than or equal to a predetermined switching temperature, and switching control means for switching the switching means from the hot water storage tank lower side to the hot water storage tank upper side, past a plurality Hot water storage means for storing the amount of hot water used for each day, and usage status determination means for determining the usage status based on information stored in the hot water storage means, the usage status determination means, A value of the degree of variation in the amount of hot water used is calculated from the information stored in the amount of used hot water storage means, and when the value of the degree of variation is less than a predetermined value, it is determined that the use situation is given priority to the boiling efficiency, the value of the variation degree so as to determine that the priority usage to ensure the high-temperature water in the case of more than the predetermined value, the switching control means, the usage decision Based on the stage of the determination result, if it is priority usage the boiling efficiency, to determine the predetermined switching temperature in a lower temperature than when a priority usage to ensure the high-temperature hot water I made it.

また、湯水を貯湯する貯湯タンクと、前記貯湯タンク内の湯水を沸き上げ設定温度に加熱して前記貯湯タンクに積層状に貯湯する沸き上げ運転を行うヒートポンプ式加熱手段と、前記貯湯タンク下部と前記ヒートポンプ式加熱手段の入口側とを接続する加熱往き管と、前記ヒートポンプ式加熱手段の出口側と前記貯湯タンク上部とを接続する加熱戻り管と、前記加熱戻り管から分岐されて前記貯湯タンク下部に接続される分岐管と、前記ヒートポンプ式加熱手段からの湯を前記貯湯タンク上部に戻すか、前記分岐管を介して前記貯湯タンク下部に戻すかを切り替える切替手段と、前記加熱戻り管に設けられ前記ヒートポンプ式加熱手段で加熱された湯水の温度を検出する沸き上げ温度センサと、前記沸き上げ運転の開始からの時間経過に伴い前記沸き上げ温度センサで検出した温度が所定の切替温度以上となると、前記切替手段を前記貯湯タンク下部側から前記貯湯タンク上部側に切り替える切替制御手段と、過去複数日間の使用湯量を日毎に記憶する使用湯量記憶手段と、前記使用湯量記憶手段に記憶されている情報に基づいて使用状況を判断する使用状況判断手段と、前記貯湯タンク内の湯を熱源として浴槽水または暖房循環水を加熱する利用側熱交換器と、過去複数日間の利用側熱交換器の使用実績を表す値を日毎に記憶する熱交使用実績記憶手段と、を備え、前記使用状況判断手段は、前記使用湯量記憶手段に記憶されている情報から使用湯量のバラツキ度合の値を算出し、前記バラツキ度合の値が所定値未満かつ前記熱交使用実績記憶手段に記憶された使用実績を表す値が所定値未満の場合に前記沸き上げ効率を優先する使用状況であると判断し、前記バラツキ度合の値が所定値以上か、または前記熱交使用実績記憶手段に記憶された使用実績を表す値が所定値以上の場合に、前記高温の湯の確保を優先する使用状況であると判断し、前記切替制御手段は、前記使用状況判断手段の判断結果に基づいて、前記沸き上げ効率を優先する使用状況であると、前記高温の湯の確保を優先する使用状況であるときに比べて前記所定の切替温度を低い温度に決定するようにした。 A hot water storage tank for storing hot water, a heat pump heating means for performing a heating operation for heating the hot water in the hot water storage tank to a set temperature for boiling and storing hot water in the hot water storage tank, and a lower part of the hot water storage tank; A heating forward pipe connecting the inlet side of the heat pump heating means, a heating return pipe connecting the outlet side of the heat pump heating means and the hot water storage tank upper part, and the hot water storage tank branched from the heating return pipe A branch pipe connected to a lower part, a switching means for switching whether the hot water from the heat pump heating means is returned to the upper part of the hot water storage tank or returned to the lower part of the hot water storage tank via the branch pipe, and the heating return pipe A boiling temperature sensor that detects the temperature of the hot water heated by the heat pump heating means, and with the passage of time from the start of the boiling operation When the temperature detected by the boiling temperature sensor is equal to or higher than a predetermined switching temperature, the switching control means for switching the switching means from the hot water storage tank lower side to the hot water storage tank upper side, and the amount of hot water used for the past plural days is stored every day. Hot water storage means for use, usage status determination means for determining the usage status based on information stored in the hot water storage means, and hot water in the hot water storage tank is used as a heat source to heat bath water or heating circulating water A heat exchange usage record storage unit that stores a value representing a use record of the use side heat exchanger for a plurality of days in the past, and the use status determination unit includes the hot water storage unit. Value of the amount of hot water used is calculated from the information stored in the value, the value of the degree of variation is less than a predetermined value, and the value representing the usage record stored in the heat exchanger usage record storage means When it is less than a predetermined value, it is determined that the use situation gives priority to the boiling efficiency, and the value of the variation degree is equal to or greater than a predetermined value, or a value representing the use record stored in the heat exchange use record storage unit is When the value is equal to or greater than a predetermined value, it is determined that the use situation gives priority to securing the hot water, and the switching control means uses the priority given to the boiling efficiency based on the judgment result of the use situation judgment means. In the situation, the predetermined switching temperature is determined to be lower than that in the usage situation where priority is given to securing the hot water.

本発明によれば、使用湯量に基づいた使用状況の判断結果に応じて、使用状況に合わせた所定の切替温度が決定されるため、貯湯タンク上部の温度を低下させたくない使用状況では所定の切替温度を高くして貯湯タンク上部の温度低下を抑制したり、貯湯タンク下部の温度を上昇させたくない使用状況では所定の切替温度を低くして貯湯タンク下部の温度上昇を抑制してヒートポンプ式加熱手段の加熱効率の低下を抑制することができ、使用状況に合わせた効率のよい運転が可能となる。   According to the present invention, since the predetermined switching temperature according to the use situation is determined according to the judgment result of the use situation based on the amount of hot water used, the predetermined change temperature is not used in the use situation where the temperature of the hot water storage tank is not desired to be lowered. A heat pump type that suppresses the temperature drop at the top of the hot water tank by increasing the switching temperature, or suppresses the temperature rise at the bottom of the hot water tank by lowering the predetermined switching temperature in situations where you do not want to raise the temperature at the bottom of the hot water tank A decrease in the heating efficiency of the heating means can be suppressed, and an efficient operation according to the use situation is possible.

本発明の一実施形態の概略構成図Schematic configuration diagram of one embodiment of the present invention 同一実施形態の制御ブロック図Control block diagram of the same embodiment 同一実施形態の作動を説明するためのフローチャートFlow chart for explaining the operation of the same embodiment 別の一実施形態の制御ブロック図Control block diagram of another embodiment 別の一実施形態の作動を説明するためのフローチャートFlowchart for explaining the operation of another embodiment

次に、本発明の一実施形態のヒートポンプ式給湯装置を図面に基づいて説明する。
図１は風呂給湯装置の構成を示す概略図で、１は湯水を貯湯する貯湯タンク、２は貯湯タンク１底部に給水する給水管、３は貯湯タンク１頂部から出湯する出湯管、４は給水管２から分岐された給水バイパス管、５は出湯管３からの湯と給水バイパス管４からの水とを混合する給湯混合弁、６は給湯混合弁５の出口と給湯栓７とを接続する給湯管、８は給湯管６を流れる湯水の流量を検出する給湯流量センサ、９は給湯管６を流れる湯水の温度を検出する給湯温度センサ、１０は給水バイパス管４を流れる給水の温度を検出する給水温度センサである。 Next, a heat pump hot water supply apparatus according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing the configuration of a bath hot water supply apparatus. 1 is a hot water storage tank for storing hot water, 2 is a water supply pipe for supplying water to the bottom of the hot water storage tank 1, 3 is a hot water discharge pipe for discharging hot water from the top of the hot water storage tank 1, and 4 is water supply. A water supply bypass pipe branched from the pipe 2, 5 is a hot water supply mixing valve for mixing hot water from the hot water discharge pipe 3 and water from the water supply bypass pipe 4, and 6 is connected to the outlet of the hot water supply mixing valve 5 and the hot water tap 7. A hot water supply pipe, 8 is a hot water supply flow sensor for detecting the flow rate of hot water flowing through the hot water supply pipe 6, 9 is a hot water supply temperature sensor for detecting the temperature of hot water flowing through the hot water supply pipe 6, and 10 is a temperature of water supply flowing through the water supply bypass pipe 4. It is a feed water temperature sensor.

１１は出湯管３からの湯と給水バイパス管４からの水とを混合する風呂混合弁、１２は風呂混合弁１１からの湯水を浴室に設置された浴槽１３へ湯張りするための湯張り管、１４は湯張り管１２を流れる湯水の流量を検出する湯張り流量センサ、１５は湯張り管１２を流れる湯水の温度を検出する湯張り温度センサ、１６は湯張り管１２の流路を開閉する湯張り電磁弁、１７は貯湯タンク１の側面上下に複数設けられて貯湯温度を検出する貯湯温度センサである。   11 is a bath mixing valve that mixes hot water from the hot water discharge pipe 3 and water from the water supply bypass pipe 4, and 12 is a hot water filling pipe for hot water from the bath mixing valve 11 to the bathtub 13 installed in the bathroom. , 14 is a hot water flow sensor for detecting the flow rate of hot water flowing through the hot water pipe 12, 15 is a hot water temperature sensor for detecting the temperature of hot water flowing through the hot water pipe 12, and 16 is for opening and closing the flow path of the hot water pipe 12. A hot water filling solenoid valve 17 is a hot water storage temperature sensor which is provided in plural above and below the side surface of the hot water storage tank 1 and detects the hot water storage temperature.

１８は貯湯タンク１内に配置されたステンレス製の蛇管により構成され、浴槽１３内の浴槽水等の外部負荷を加熱するための利用側熱交換器としての風呂熱交換器、１９は浴槽１３と風呂熱交換器１８とを浴槽水が循環可能に接続する風呂循環回路、２０は浴槽１３内の浴槽水を吸い込んで風呂熱交換器１８へ圧送して浴槽水を循環させるための風呂循環ポンプ、２１は風呂循環回路１９の往き戻りを接続する風呂熱交バイパス管、２２は浴槽１３から戻ってきた浴槽水が風呂熱交換器１８を流れる状態と風呂熱交バイパス管２１を流れる状態とを切り替える風呂三方弁、２３は浴槽水の温度を検出するための風呂温度センサ、２４は水圧を検知することにより浴槽１３内の水位を検出する水位センサであり、風呂循環回路１９途中には湯張り管１２が接続されている。   18 is composed of a stainless steel serpentine tube disposed in the hot water storage tank 1, and a bath heat exchanger as a use side heat exchanger for heating an external load such as bath water in the bathtub 13, A bath circulation circuit for connecting bath water to the bath heat exchanger 18 so that the bath water can circulate, 20 a bath circulation pump for sucking the bath water in the bath 13 and pumping it to the bath heat exchanger 18 to circulate the bath water, Reference numeral 21 denotes a bath heat exchange bypass pipe that connects the return of the bath circulation circuit 19, and 22 switches between a state in which the bath water returned from the bathtub 13 flows through the bath heat exchanger 18 and a state through the bath heat exchange bypass pipe 21. A bath three-way valve, 23 is a bath temperature sensor for detecting the temperature of the bath water, 24 is a water level sensor for detecting the water level in the bathtub 13 by detecting the water pressure. Tube 12 is connected.

２５は貯湯タンク１内の湯水を加熱するためのヒートポンプ式加熱手段、２６は貯湯タンク１下部とヒートポンプ式加熱手段２５の入口側とを接続する加熱往き管、２７はヒートポンプ式加熱手段２５の出口側と貯湯タンク１上部とを接続する加熱戻り管、２８は加熱往き管２６途中に設けられ湯水を循環させる加熱循環ポンプ、２９は加熱戻り管２７から分岐されて貯湯タンク１下部に接続される分岐管、３０はヒートポンプ式加熱手段２５からの湯を貯湯タンク１上部に戻すか、分岐管２９を介して貯湯タンク１下部に戻すかを切り替える切替手段、３１はヒートポンプ式加熱手段２５に入水する湯水の温度を検出する入水温度センサ、３２はヒートポンプ式加熱手段２３で沸き上げられた湯水の温度を検出する沸き上げ温度センサである。   25 is a heat pump type heating means for heating the hot water in the hot water storage tank 1, 26 is a heating forward pipe connecting the lower part of the hot water storage tank 1 and the inlet side of the heat pump type heating means 25, and 27 is an outlet of the heat pump type heating means 25. The heating return pipe connecting the side and the upper part of the hot water storage tank 1, 28 is a heating circulation pump provided in the middle of the heating forward pipe 26 for circulating hot water, and 29 is branched from the heating return pipe 27 and connected to the lower part of the hot water storage tank 1. A branch pipe, 30 is a switching means for switching whether the hot water from the heat pump heating means 25 is returned to the upper part of the hot water storage tank 1 or returned to the lower part of the hot water storage tank 1 via the branch pipe 29, and 31 enters the heat pump type heating means 25 An incoming water temperature sensor 32 detects the temperature of hot water, and a boiling temperature sensor 32 detects the temperature of hot water heated by the heat pump type heating means 23. .

ここで、ヒートポンプ式加熱手段２５は、ＣＯ２等の冷媒を圧縮する圧縮機３３、貯湯タンク１からの湯水と冷媒とを熱交換する水冷媒熱交換器３４、放熱した冷媒を膨張減圧させる膨張弁３５、低温低圧の冷媒と外気とを熱交換する空気熱交換器３６、空気熱交換器３６に外気を送風する送風機３７、外気温度を検出する外気温度センサ３８とを備えて構成されている。   Here, the heat pump type heating means 25 includes a compressor 33 that compresses a refrigerant such as CO2, a water refrigerant heat exchanger 34 that exchanges heat between the hot water and the refrigerant from the hot water storage tank 1, and an expansion valve that expands and depressurizes the radiated refrigerant. 35, an air heat exchanger 36 that exchanges heat between the low-temperature and low-pressure refrigerant and the outside air, a blower 37 that blows outside air to the air heat exchanger 36, and an outside air temperature sensor 38 that detects the outside air temperature.

３９は、給湯装置のリモコンで、給湯装置の作動状態や設定状態を表示する表示部４０と、浴槽１３への自動湯張り運転および自動保温運転を開始させるための風呂スイッチ４１と、給湯設定温度や風呂設定温度を変更するための変更スイッチ４２ととを備えている。   Reference numeral 39 denotes a remote controller for the hot water supply device, which includes a display unit 40 for displaying an operating state and a setting state of the hot water supply device, a bath switch 41 for starting an automatic hot water filling operation and an automatic heat insulation operation for the bathtub 13, and a hot water supply set temperature. And a change switch 42 for changing the bath set temperature.

４３はこの給湯装置の作動を制御する制御手段で、給湯流量センサ８、給湯温度センサ９、給水温度センサ１０、湯張り流量センサ１４、湯張り温度センサ１５、貯湯温度センサ１７、風呂温度センサ２３、水位センサ２４、入水温度センサ３１、沸き上げ温度センサ３２、外気温度センサ３８の検出値が入力され、給湯混合弁５、風呂混合弁１１、湯張り電磁弁１６、風呂循環ポンプ２０、風呂三方弁２２、加熱循環ポンプ２８、切替手段３０、圧縮機３３、膨張弁３５、送風機３７の作動を制御すると共に、リモコン３９と必要な情報を送受信可能に接続されている。ここで、制御手段４３は、ＭＰＵ等の論理回路を有してメモリを参照しつつ予め記憶されているプログラムに従って作動を制御するものである。   Reference numeral 43 denotes a control means for controlling the operation of the hot water supply device. The hot water flow rate sensor 8, the hot water temperature sensor 9, the hot water temperature sensor 10, the hot water flow rate sensor 14, the hot water temperature sensor 15, the hot water temperature sensor 17, and the bath temperature sensor 23. , The water level sensor 24, the incoming water temperature sensor 31, the boiling temperature sensor 32, and the outside air temperature sensor 38 are input, and the hot water mixing valve 5, the bath mixing valve 11, the hot water solenoid valve 16, the bath circulation pump 20, the bath three-way It controls the operation of the valve 22, the heating circulation pump 28, the switching means 30, the compressor 33, the expansion valve 35, and the blower 37, and is connected to the remote controller 39 so that necessary information can be transmitted and received. Here, the control means 43 has a logic circuit such as an MPU and controls the operation according to a program stored in advance while referring to the memory.

次に、図２に示す本発明の一実施形態の制御ブロック図について説明する。   Next, a control block diagram of one embodiment of the present invention shown in FIG. 2 will be described.

４４は給湯流量センサ８で検出する給湯流量に基づいて所定温度換算の使用湯量を算出し、過去複数日間（例えば７日間）の使用湯量を日毎に記憶する使用湯量記憶手段である。ここでは、給湯流量センサ８で検出する給湯流量と、給湯温度センサ９で検出する給湯温度と、給水温度センサ１０で検出する給水温度とから所定温度換算の使用湯量を算出するようにしているが、給湯温度に代えて給湯設定温度を用いたり、給水温度に代えて最下部の貯湯温度センサ１７が検出した前日の最低温度等を用いてもよい。   Reference numeral 44 denotes hot water storage means for calculating the amount of hot water converted into a predetermined temperature based on the hot water flow rate detected by the hot water supply flow sensor 8 and storing the amount of hot water used for a plurality of past days (for example, 7 days) every day. Here, the amount of hot water used in a predetermined temperature is calculated from the hot water flow rate detected by the hot water supply flow sensor 8, the hot water temperature detected by the hot water temperature sensor 9, and the hot water temperature detected by the water temperature sensor 10. Alternatively, the set hot water temperature may be used instead of the hot water temperature, or the lowest temperature of the previous day detected by the lowermost hot water storage temperature sensor 17 may be used instead of the hot water temperature.

４５は使用湯量記憶手段４４に記憶されている日毎の使用湯量の情報に基づいて、沸き上げ効率を優先する使用状況か、高温の湯の確保を優先する使用状況かを判断する使用状況判断手段である。ここでは、使用状況判断手段４５は、使用湯量記憶手段４４に記憶されている日毎の使用湯量のバラツキ度合の値を算出し、このバラツキ度合の値が所定値未満のバラツキが少ない場合に沸き上げ効率を優先する使用状況であると判断し、バラツキ度合の値が所定値以上の場合に高温の湯の確保を優先する使用状況であると判断するようにしている。   45 is a usage status determining means for determining whether the usage status prioritizes boiling efficiency or the usage status prioritizing securing hot water based on the daily hot water usage information stored in the usage hot water storage means 44. It is. Here, the use status determination means 45 calculates the value of the degree of variation in the amount of hot water used for each day stored in the amount of hot water storage means 44, and raises the boiling when the value of the degree of variation is less than a predetermined value. It is determined that the use situation gives priority to efficiency, and when the value of the variation degree is equal to or higher than a predetermined value, it is judged that the use situation gives priority to securing hot water.

４６は沸き上げ温度センサ３２で検出した温度が所定の切替温度以上となると、切替手段３０を貯湯タンク１下部に連通する分岐管２９側から貯湯タンク１上部に連通する加熱戻り管２７下流側に切り替える切替制御手段である。ここで、切替制御手段４６は、使用状況判断手段４５の判断結果に基づいて所定の切替温度を決定するようにしており、沸き上げ効率を優先する使用状況であると、高温の湯の確保を優先する使用状況であるときに比べて所定の切替温度を低い温度に決定するようにしている。   46, when the temperature detected by the boiling temperature sensor 32 becomes equal to or higher than a predetermined switching temperature, the switching means 30 is moved from the branch pipe 29 communicating with the lower part of the hot water tank 1 to the downstream side of the heating return pipe 27 communicating with the upper part of the hot water tank 1. Switching control means for switching. Here, the switching control means 46 determines a predetermined switching temperature based on the determination result of the usage status determination means 45, and if the usage status gives priority to the boiling efficiency, securing of hot water is ensured. The predetermined switching temperature is determined to be lower than that in the priority usage situation.

次に、本発明のヒートポンプ式給湯装置の作動について説明する。   Next, the operation of the heat pump hot water supply apparatus of the present invention will be described.

＜給湯＞
給湯栓７が開かれると、貯湯タンク１の底部に給水管２から市水が流入すると共に貯湯タンク１の頂部から出湯管３を介して高温の湯が出湯し、給湯混合弁５で給水バイパス管４からの水と混合されて給湯管６を通過する。そして、給湯流量センサ８が最低作動水量以上を検出すると、制御手段４３は、給湯温度センサ９が検出する温度が給湯設定温度と一致するように給湯混合弁５の弁開度をフィードバック制御して、給湯設定温度の給湯を行う。そして、給湯栓７が閉じられる等によって、給湯流量センサ８が最低作動水量未満を検出すると、制御手段４３は、給湯混合弁５の弁開度のフィードバック制御を停止して給湯停止するようにしている。 <Hot water supply>
When the hot-water tap 7 is opened, city water flows into the bottom of the hot water storage tank 1 from the water supply pipe 2 and hot water is discharged from the top of the hot water storage tank 1 through the hot water discharge pipe 3. It is mixed with water from the pipe 4 and passes through the hot water supply pipe 6. When the hot water supply flow sensor 8 detects a minimum working water amount or more, the control means 43 feedback-controls the valve opening of the hot water supply mixing valve 5 so that the temperature detected by the hot water supply temperature sensor 9 matches the hot water supply set temperature. Hot water supply at the set temperature is performed. When the hot water supply flow rate sensor 8 detects that the amount of operating water is less than the minimum operating water amount, for example, when the hot water tap 7 is closed, the control means 43 stops the hot water supply by stopping the feedback control of the valve opening of the hot water supply mixing valve 5. Yes.

このとき、使用湯量記憶手段４４は、給湯流量センサ８で検出する給湯流量と、給湯温度センサ９で検出する給湯温度と、給水温度センサ１０で検出する給水温度とから所定温度換算の使用湯量を算出し、算出した使用湯量を当日の記憶領域に加算して日毎の使用流量を記憶している。   At this time, the hot water storage unit 44 uses the hot water flow rate detected by the hot water supply flow sensor 8, the hot water temperature detected by the hot water temperature sensor 9, and the hot water temperature detected by the hot water temperature sensor 10 to calculate the used hot water amount converted to a predetermined temperature. The amount of used hot water is calculated and added to the storage area of the day to store the daily flow rate.

＜風呂自動運転＞
次に、風呂自動運転について説明する。リモコン３９の風呂スイッチ４１が操作されると、制御手段４３は、湯張り電磁弁１６を開弁し、湯張り温度センサ１５が検出する温度が風呂設定温度と一致するように風呂混合弁１１の弁開度をフィードバック制御して、風呂設定温度の湯張り運転を開始する。 <Automatic bath operation>
Next, bath automatic operation will be described. When the bath switch 41 of the remote control 39 is operated, the control means 43 opens the hot water solenoid valve 16 and the bath mixing valve 11 is set so that the temperature detected by the hot water temperature sensor 15 matches the bath set temperature. The valve opening degree is feedback-controlled, and the filling operation at the bath set temperature is started.

そして、制御手段４３は、湯張り流量センサ１４で検出する湯張り流量の積算値が風呂設定湯量となると、または水位センサ２４が風呂設定水位を検出すると、湯張り電磁弁１６を閉弁して湯張り運転を終了し、風呂の保温運転を行う。   Then, the control means 43 closes the hot water solenoid valve 16 when the integrated value of the hot water flow rate detected by the hot water flow rate sensor 14 becomes the bath setting hot water amount or when the water level sensor 24 detects the bath setting water level. Terminate the hot water filling operation and keep the bath warm.

風呂の保温運転では、制御手段４３は、風呂三方弁２２を風呂熱交バイパス管２１側にしたままで一定時間毎に風呂循環ポンプ２０を駆動して風呂温度センサ２３で浴槽水の温度を確認し、風呂設定温度より低くなっていることを検知すると、風呂三方弁２２を風呂熱交換器１８側に切り替えて循環を継続し、浴槽水を風呂熱交換器１８で加熱する。そして、制御手段４３は、風呂温度センサ２３で浴槽水の温度が風呂設定温度より上昇したことを確認すると、風呂循環ポンプ２０の駆動を停止し、風呂三方弁２２を風呂熱交バイパス管２１側に切り替える。   In the heat insulation operation of the bath, the control means 43 drives the bath circulation pump 20 at regular intervals while keeping the bath three-way valve 22 on the side of the heat exchanger bypass pipe 21 and confirms the temperature of the bath water with the bath temperature sensor 23. When it is detected that the temperature is lower than the bath set temperature, the bath three-way valve 22 is switched to the bath heat exchanger 18 side to continue the circulation, and the bath water is heated by the bath heat exchanger 18. And if the control means 43 confirms that the temperature of bath water rose from bath setting temperature with the bath temperature sensor 23, the drive of the bath circulation pump 20 will be stopped and the bath three-way valve 22 will be made into the bath heat exchanger bypass pipe 21 side. Switch to.

また、制御手段４３は、湯張り停止時の浴槽１３内の水位を水位センサ２４の検出値に基づいて記憶し、浴槽１３内の水位が記憶した水位から低下すると、元の水位になるまで湯張りする風呂補水運転を行う。   Moreover, the control means 43 memorize | stores the water level in the bathtub 13 at the time of a hot water stop based on the detected value of the water level sensor 24, and when the water level in the bathtub 13 falls from the memorize | stored water level, hot water is used until it becomes the original water level. Perform bath replenishment operation.

そして、制御手段４３は、湯張りの開始から予め設定された風呂自動保温時間が経過すると、風呂の保温運転および風呂補水運転も停止して、風呂自動運転を停止する。   And if the bath automatic heat retention time preset from the start of hot water filling passes, the control means 43 will also stop bath heat retention operation and bath water replenishment operation, and will stop automatic bath operation.

＜沸き上げ運転＞
次に、沸き上げ運転について説明すると、電力料金単価の安価な所定時間帯（深夜時間帯）の開始時刻になると、制御手段４３はそれまでの給湯負荷量に見合う湯量を沸き上げ開始するべく、圧縮機３３と膨張弁３５と送風機３７と加熱循環ポンプ２８を駆動開始して、貯湯タンク１下部から取り出した湯水を水冷媒熱交換器３４で給湯負荷量に見合う沸き上げ目標温度まで加熱して貯湯タンク１上部へ戻し、貯湯タンク１上部から沸き上げ設定温度の湯を積層状に貯湯し、貯湯タンク１の最下部まで沸き上げるか、所定時間帯の終了時刻に到達すると、圧縮機３３と膨張弁３５と送風機３７と加熱循環ポンプ２８を駆動停止して沸き上げ運転を終了する。 <Boiling operation>
Next, the boiling operation will be described. At the start time of a predetermined time zone (midnight time zone) where the unit price of electricity is inexpensive, the control means 43 starts boiling the hot water amount corresponding to the hot water supply load amount until then. The compressor 33, the expansion valve 35, the blower 37, and the heating circulation pump 28 are started to drive, and the hot water taken out from the lower part of the hot water storage tank 1 is heated to the boiling target temperature corresponding to the hot water supply load amount by the water refrigerant heat exchanger 34. Return to the upper part of the hot water storage tank 1, store hot water at the set temperature from the upper part of the hot water storage tank 1, and boil it up to the lowest part of the hot water storage tank 1, or when the end time of the predetermined time zone is reached, The expansion valve 35, the blower 37, and the heating circulation pump 28 are stopped to finish the boiling operation.

また、制御手段４３は、貯湯タンク１内の残湯量が少なくなったことを貯湯温度センサ１７の検出温度に基づいて判断した場合も、前記沸き上げ運転を行うようにしており、この場合、予め決められた位置の貯湯温度センサ１７の検出温度が所定温度に達すると沸き上げ運転を終了するようにしている。   Further, the control means 43 performs the boiling operation even when it is determined based on the temperature detected by the hot water storage temperature sensor 17 that the amount of remaining hot water in the hot water storage tank 1 has decreased. When the temperature detected by the hot water storage temperature sensor 17 at a predetermined position reaches a predetermined temperature, the boiling operation is terminated.

この沸き上げ運転の動作について、図３に示すフローチャートに基づいて詳細に説明する。   The operation of this boiling operation will be described in detail based on the flowchart shown in FIG.

沸き上げ開始条件が成立すると（ステップＳ１でＹｅｓ）、制御手段４３は、切替手段３０を分岐管２９に連通する貯湯タンク１下部側に切り替え（ステップＳ２）、ヒートポンプ式加熱手段２５で沸き上げられた湯水が貯湯タンク１下部に戻るようにして沸き上げ運転を開始する（ステップＳ３）。   When the boiling start condition is satisfied (Yes in step S1), the control means 43 switches the switching means 30 to the lower side of the hot water storage tank 1 communicating with the branch pipe 29 (step S2) and is heated by the heat pump heating means 25. The boiling operation is started so that the hot water returns to the lower part of the hot water storage tank 1 (step S3).

そして、使用状況判断手段４５は、使用湯量記憶手段４４に記憶されている日毎の使用湯量の情報から、バラツキ度合の値としての標準偏差を算出し（ステップＳ４）、この標準偏差の値を予め決められた所定値と比較し（ステップＳ５）、所定値以上の場合は、日々の使用湯量の変動が大きく、省エネルギーを意識した給湯を行うよりも湯切れをしないことを優先した方がよいと考えられるため、高温の湯の確保を優先する使用状況であると判断し、所定の切替温度を第１切替温度（ここでは６０℃）に決定する（ステップＳ６）。一方、標準偏差の値が所定値未満の場合は、日々の使用湯量の変動が少なく、省エネルギーを意識した給湯を行っていると考えられるため、沸き上げ効率を優先する使用状況であると判断し、所定の切替温度を第１切替温度よりも低い第２切替温度（ここでは５０℃）に決定する（ステップＳ７）。   Then, the use status determining means 45 calculates a standard deviation as a variation degree value from the daily hot water volume information stored in the used hot water volume storage means 44 (step S4), and calculates the standard deviation value in advance. Compared with the determined predetermined value (step S5), if it is greater than or equal to the predetermined value, daily fluctuations in the amount of hot water used are large, and it is better to give priority to not running out of hot water than to perform hot water supply conscious of energy saving Since it is conceivable, it is determined that the use situation gives priority to securing hot water, and the predetermined switching temperature is determined to be the first switching temperature (here, 60 ° C.) (step S6). On the other hand, if the standard deviation value is less than the predetermined value, the amount of hot water used will not fluctuate daily and it is considered that the hot water supply is conscious of energy conservation. Then, the predetermined switching temperature is determined to be a second switching temperature (here, 50 ° C.) lower than the first switching temperature (step S7).

沸き上げ運転の開始からの時間経過に伴い、ヒートポンプ式加熱手段２５で沸き上げられた湯の温度が徐々に上昇し、ステップＳ６またはステップＳ７で決定した所定の切替温度に達するまでの間は、沸き上げられた湯は分岐管２９を介して貯湯タンク１の下部へ戻され、貯湯タンク１上部に貯湯されている湯の温度を低下させない。   With the lapse of time from the start of the boiling operation, until the temperature of the hot water heated by the heat pump heating means 25 gradually increases and reaches the predetermined switching temperature determined in step S6 or step S7, The boiled hot water is returned to the lower part of the hot water storage tank 1 through the branch pipe 29, and the temperature of the hot water stored in the upper part of the hot water storage tank 1 is not lowered.

さらに時間経過し、ヒートポンプ式加熱手段２５で沸き上げられた湯の温度が、ステップＳ６またはステップＳ７で決定した所定の切替温度に達すると（ステップＳ８でＹｅｓ）、切替手段３０を加熱戻り管２７下流と連通する貯湯タンク１上部側に切り替え（ステップＳ９）、ヒートポンプ式加熱手段２５で沸き上げられた湯水が貯湯タンク１の上部に戻るようにして沸き上げ運転を継続する。   When the time further elapses and the temperature of the hot water heated by the heat pump heating means 25 reaches the predetermined switching temperature determined in step S6 or step S7 (Yes in step S8), the switching means 30 is connected to the heating return pipe 27. Switching to the upper side of the hot water storage tank 1 communicating with the downstream (step S9), the hot water heated by the heat pump heating means 25 is returned to the upper part of the hot water storage tank 1, and the boiling operation is continued.

このとき、高温の湯の確保を優先する使用状況である場合は、貯湯タンク１の上部に戻る湯水の温度が比較的高い温度となっているため、貯湯タンク１上部に貯湯されている湯の温度の低下を抑制でき、一方、沸き上げ効率を優先する使用状況である場合は、貯湯タンク１の下部に戻る湯水の温度が比較的低い状態で切替手段３０がタンク上部側に切り替えられるため、貯湯タンク１下部に貯められている水の温度上昇を抑制して、ヒートポンプ式加熱手段２５の加熱効率の低下を抑制することができる。   At this time, when the priority is to secure hot water, the temperature of the hot water returning to the upper part of the hot water storage tank 1 is relatively high. On the other hand, in the case of a usage situation that prioritizes boiling efficiency, the switching means 30 can be switched to the tank upper side with the temperature of the hot water returning to the lower part of the hot water storage tank 1 being relatively low. The rise in the temperature of the water stored in the lower part of the hot water storage tank 1 can be suppressed, and the decrease in the heating efficiency of the heat pump heating means 25 can be suppressed.

そして、沸き上げ運転が進行して沸き上げ終了条件が成立すると（ステップＳ１０でＹｅｓ）、沸き上げ運転を停止する（ステップＳ１１）。   When the boiling operation proceeds and the boiling end condition is satisfied (Yes in step S10), the boiling operation is stopped (step S11).

このように、使用湯量に基づいた使用状況の判断結果に応じて、使用状況に合わせた所定の切替温度が決定されるため、貯湯タンク上部の温度を低下させたくない使用状況では所定の切替温度を高くして貯湯タンク上部の温度低下を抑制したり、貯湯タンク下部の温度を上昇させたくない使用状況では所定の切替温度を低くして貯湯タンク下部の温度上昇を抑制してヒートポンプ加熱手段の加熱効率の低下を抑制することができ、使用状況に合わせた効率のよい運転が可能となる。   Thus, since the predetermined switching temperature according to the usage status is determined according to the determination result of the usage status based on the amount of hot water used, the predetermined switching temperature is used in the usage status where it is not desired to lower the temperature of the hot water storage tank. To prevent the temperature drop at the upper part of the hot water tank, or when you do not want to raise the temperature at the lower part of the hot water tank, lower the specified switching temperature to suppress the temperature rise at the lower part of the hot water tank and A decrease in heating efficiency can be suppressed, and an efficient operation in accordance with the use situation is possible.

次に、本発明の別の一実施形態について図面に基づいて説明する。なお、先の一実施形態と同一の構成は同一の符号を付してその説明を省略する。   Next, another embodiment of the present invention will be described with reference to the drawings. In addition, the same structure as previous one Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the description.

図４は別の一実施形態の制御ブロック図である。
４７は熱交使用実績記憶手段で、浴槽の追い焚き等の外部負荷の加熱に貯湯タンク１内に貯湯されている湯がどの程度使われたかを示す使用実績を過去複数日分日毎に記憶するもので、ここでは、風呂三方弁２２が風呂熱交換器１８側でかつ風呂循環ポンプ２０が作動している時間を熱交使用実績時間として日毎に積算して記憶している。 FIG. 4 is a control block diagram of another embodiment.
47 is a heat exchange use record storage means for storing a use record showing how much hot water stored in the hot water storage tank 1 has been used for heating of an external load such as reheating of a bathtub every past several days. Therefore, here, the time during which the bath three-way valve 22 is on the side of the bath heat exchanger 18 and the bath circulation pump 20 is operating is accumulated and memorized every day as the heat exchange use result time.

４８は使用湯量記憶手段４４に記憶されている日毎の使用湯量の情報と、熱交使用実績記憶手段４７に記憶されている日毎の熱交使用実績の情報とに基づいて、沸き上げ効率を優先する使用状況か、高温の湯の確保を優先する使用状況かを判断する使用状況判断手段である。ここでは、使用湯量のバラツキ度合の値が所定値未満かつ熱交使用実績時間の最大値が所定時間未満である場合に沸き上げ効率を優先する使用状況であると判断し、それ以外の場合に高温の湯の確保を優先する使用状況であると判断するようにしている。   48 gives priority to boiling efficiency based on the information on the daily hot water usage stored in the hot water storage means 44 and the daily heat usage information stored in the heat exchange usage storage 47 It is a usage status determination means for determining whether the usage status is a usage status or a usage status where priority is given to securing hot water. Here, when the value of the amount of hot water used is less than the predetermined value and the maximum value of the actual heat exchange usage time is less than the predetermined time, it is determined that the use efficiency is given priority to the boiling efficiency, and otherwise It is judged that it is a usage situation that prioritizes securing hot water.

次に、この別の実施形態の沸き上げ運転の動作について、図５に示すフローチャートに基づいて説明する。   Next, the operation of the boiling operation of this another embodiment will be described based on the flowchart shown in FIG.

沸き上げ開始条件が成立すると（ステップＳ１でＹｅｓ）、制御手段４３は、切替手段３０を分岐管２９に連通する貯湯タンク１下部側に切り替え（ステップＳ２）、ヒートポンプ式加熱手段２５で沸き上げられた湯水が貯湯タンク１下部に戻るようにして沸き上げ運転を開始する（ステップＳ３）。   When the boiling start condition is satisfied (Yes in step S1), the control means 43 switches the switching means 30 to the lower side of the hot water storage tank 1 communicating with the branch pipe 29 (step S2) and is heated by the heat pump heating means 25. The boiling operation is started so that the hot water returns to the lower part of the hot water storage tank 1 (step S3).

そして、使用状況判断手段４８は、使用湯量記憶手段４４に記憶されている日毎の使用湯量の情報から、バラツキ度合の値としての標準偏差を算出し（ステップＳ４）、さらに熱交使用実績記憶手段４７に記憶されている日毎の熱交使用実績時間の情報から、過去複数日間のうちでの熱交使用実績時間の最大値を算出する（ステップＳ４１）。   And the use condition judgment means 48 calculates the standard deviation as the value of the variation degree from the information on the daily use hot water quantity stored in the used hot water quantity storage means 44 (step S4), and further the heat exchanger usage record storage means. The maximum value of the heat exchange use actual time in the past plural days is calculated from the information of the heat exchange use actual time for each day stored in 47 (step S41).

そして、使用状況判断手段４８は、標準偏差の値を予め決められた所定値と比較し（ステップＳ５）、所定値以上の場合は、日々の使用湯量の変動が大きく、省エネルギーを意識した給湯を行うよりも湯切れをしないことを優先した方がよいと考えられるため、高温の湯の確保を優先する使用状況であると判断し、所定の切替温度を第１切替温度（ここでは６０℃）に決定する（ステップＳ６）。   Then, the usage status determining means 48 compares the standard deviation value with a predetermined value (step S5). If the standard deviation value is equal to or larger than the predetermined value, the amount of hot water used varies greatly every day, and hot water supply is conscious of energy saving. Since it is considered better to give priority to not running out of hot water than to do, it is determined that the use situation gives priority to securing hot water, and the predetermined switching temperature is set to the first switching temperature (here, 60 ° C.). (Step S6).

一方、標準偏差の値が所定値未満の場合（ステップＳ５でＮｏ）は、熱交使用実績時間の最大値と予め決められている所定時間とを比較し（ステップＳ５１）、所定時間以上である場合（ステップＳ５１でＮｏ）、風呂の追い焚きなどの利用側の負荷が大きく、省エネルギーを意識した給湯を行うよりも利用側の加熱能力を確保することを優先した方がよいと考えられるため、高温の湯の確保を優先する使用状況であると判断し、所定の切替温度を第１切替温度（ここでは６０℃）に決定する（ステップＳ６）。   On the other hand, when the value of the standard deviation is less than the predetermined value (No in step S5), the maximum value of the heat exchanger use actual time is compared with a predetermined time (step S51), and is equal to or longer than the predetermined time. In such a case (No in step S51), the load on the use side such as bathing of the bath is large, and it is considered better to prioritize securing the heating capacity on the use side rather than performing hot water supply conscious of energy saving. It is determined that the use situation gives priority to securing high-temperature hot water, and the predetermined switching temperature is determined as the first switching temperature (here, 60 ° C.) (step S6).

また、標準偏差の値が所定値未満の場合（ステップＳ５でＮｏ）で、熱交使用実績時間の最大値が所定時間未満である場合（ステップＳ５１でＹｅｓ）、日々の使用湯量の変動が少なく、かつ利用側の負荷も小さく、省エネルギーを意識した給湯を行っていると考えられるため、沸き上げ効率を優先する使用状況であると判断し、所定の切替温度を第１切替温度よりも低い第２切替温度（ここでは５０℃）に決定する（ステップＳ７）。   In addition, when the standard deviation value is less than the predetermined value (No in step S5), and the maximum value of the actual heat exchange use time is less than the predetermined time (Yes in step S51), the fluctuation of the daily hot water usage is small. In addition, since the load on the user side is small and it is considered that hot water supply is performed in consideration of energy saving, it is determined that the use is given priority to boiling efficiency, and the predetermined switching temperature is lower than the first switching temperature. Two switching temperatures (here, 50 ° C.) are determined (step S7).

沸き上げ運転の開始からの時間経過に伴い、ヒートポンプ式加熱手段２５で沸き上げられた湯の温度が徐々に上昇し、ステップＳ６またはステップＳ７で決定した所定の切替温度に達するまでの間は、沸き上げられた湯は分岐管２９を介して貯湯タンク１の下部へ戻され、貯湯タンク１上部に貯湯されている湯の温度を低下させない。   With the lapse of time from the start of the boiling operation, until the temperature of the hot water heated by the heat pump heating means 25 gradually increases and reaches the predetermined switching temperature determined in step S6 or step S7, The boiled hot water is returned to the lower part of the hot water storage tank 1 through the branch pipe 29, and the temperature of the hot water stored in the upper part of the hot water storage tank 1 is not lowered.

さらに時間経過し、ヒートポンプ式加熱手段２５で沸き上げられた湯の温度が、ステップＳ６またはステップＳ７で決定した所定の切替温度に達すると（ステップＳ８でＹｅｓ）、切替手段３０を加熱戻り管２７下流と連通する貯湯タンク１上部側に切り替え（ステップＳ９）、ヒートポンプ式加熱手段２５で沸き上げられた湯水が貯湯タンク１の上部に戻るようにして沸き上げ運転を継続する。   When the time further elapses and the temperature of the hot water heated by the heat pump heating means 25 reaches the predetermined switching temperature determined in step S6 or step S7 (Yes in step S8), the switching means 30 is connected to the heating return pipe 27. Switching to the upper side of the hot water storage tank 1 communicating with the downstream (step S9), the hot water heated by the heat pump heating means 25 is returned to the upper part of the hot water storage tank 1, and the boiling operation is continued.

このとき、高温の湯の確保を優先する使用状況である場合は、貯湯タンク１の上部に戻る湯水の温度が比較的高い温度となっているため、貯湯タンク１上部に貯湯されている湯の温度の低下を抑制でき、一方、沸き上げ効率を優先する使用状況である場合は、貯湯タンク１の下部に戻る湯水の温度が比較的低い状態で切替手段３０がタンク上部側に切り替えられるため、貯湯タンク１下部に貯められている水の温度上昇を抑制して、ヒートポンプ式加熱手段２５の加熱効率の低下を抑制することができる。   At this time, when the priority is to secure hot water, the temperature of the hot water returning to the upper part of the hot water storage tank 1 is relatively high. On the other hand, in the case of a usage situation that prioritizes boiling efficiency, the switching means 30 can be switched to the tank upper side with the temperature of the hot water returning to the lower part of the hot water storage tank 1 being relatively low. The rise in the temperature of the water stored in the lower part of the hot water storage tank 1 can be suppressed, and the decrease in the heating efficiency of the heat pump heating means 25 can be suppressed.

そして、沸き上げ運転が進行して沸き上げ終了条件が成立すると（ステップＳ１０でＹｅｓ）、沸き上げ運転を停止する（ステップＳ１１）。   When the boiling operation proceeds and the boiling end condition is satisfied (Yes in step S10), the boiling operation is stopped (step S11).

このように、使用湯量に基づいた使用状況の判断結果に応じて、使用状況に合わせた所定の切替温度が決定されるため、貯湯タンク上部の温度を低下させたくない使用状況では所定の切替温度を高くして貯湯タンク上部の温度低下を抑制したり、貯湯タンク下部の温度を上昇させたくない使用状況では所定の切替温度を低くして貯湯タンク下部の温度上昇を抑制してヒートポンプ加熱手段の加熱効率の低下を抑制することができ、使用状況に合わせた効率のよい運転が可能となる。   Thus, since the predetermined switching temperature according to the usage status is determined according to the determination result of the usage status based on the amount of hot water used, the predetermined switching temperature is used in the usage status where it is not desired to lower the temperature of the hot water storage tank. To prevent the temperature drop at the upper part of the hot water tank, or when you do not want to raise the temperature at the lower part of the hot water tank, lower the specified switching temperature to suppress the temperature rise at the lower part of the hot water tank and A decrease in heating efficiency can be suppressed, and an efficient operation in accordance with the use situation is possible.

なお、本発明は上記実施形態に限定されるものではなく、発明の要旨を変更しない範囲で改変可能なものであり、例えば利用側熱交換器の負荷として浴槽１３を接続し、浴槽水を加熱する構成で説明したが、利用側熱交換器の負荷として温水暖房端末を接続し、暖房循環水を加熱する構成としてもよい。また、利用側熱交換器を貯湯タンク１の内部に設けた構成で説明したが、利用側熱交換器をプレート式熱交換器等で構成して貯湯タンク１の外部に設け、貯湯タンク１上部からの湯を利用側熱交換器の一次側に循環させる構成としてもよい。   In addition, this invention is not limited to the said embodiment, It can modify | change within the range which does not change the summary of invention, For example, the bathtub 13 is connected as a load of a utilization side heat exchanger, and bathtub water is heated. However, it is also possible to connect the hot water heating terminal as a load of the use side heat exchanger and heat the heating circulating water. Further, the use side heat exchanger has been described as being provided inside the hot water storage tank 1, but the use side heat exchanger is constituted by a plate heat exchanger or the like and provided outside the hot water storage tank 1, so It is good also as a structure which circulates the hot water from to the primary side of a utilization side heat exchanger.

また、使用状況判断手段４５、４８の判断材料に使用湯量の最大値を加え、沸き上げ効率を優先する使用状況と判断する条件に、使用湯量の最大値が所定量を超えないという条件を付加して、沸き上げ効率を優先する使用状況と判断する精度を上げるようにしてもよい。   In addition, the maximum value of the amount of hot water used is added to the judgment material of the usage status judging means 45 and 48, and the condition that the maximum value of the amount of hot water used does not exceed the predetermined amount is added to the condition for judging the usage status giving priority to boiling efficiency. Then, it may be possible to increase the accuracy of determining that the use efficiency prioritizes boiling efficiency.

１ 貯湯タンク
１８ 風呂熱交換器（利用側熱交換器）
２５ ヒートポンプ式加熱手段
２６ 加熱往き管
２７ 加熱戻り管
２９ 分岐管
３０ 切替手段
３２ 沸き上げ温度センサ
４４ 使用湯量記憶手段
４５ 使用状況判断手段
４６ 切替制御手段
４７ 熱交使用実績記憶手段
４８ 使用状況判断手段 1 Hot water storage tank 18 Bath heat exchanger (use side heat exchanger)
25 Heat pump type heating means 26 Heating forward pipe 27 Heating return pipe 29 Branch pipe 30 Switching means 32 Boiling temperature sensor 44 Hot water storage means 45 Usage status judgment means 46 Switching control means 47 Heat exchange usage record storage means 48 Usage situation judgment means

Claims (2)

湯水を貯湯する貯湯タンクと、前記貯湯タンク内の湯水を沸き上げ設定温度に加熱して前記貯湯タンクに積層状に貯湯する沸き上げ運転を行うヒートポンプ式加熱手段と、前記貯湯タンク下部と前記ヒートポンプ式加熱手段の入口側とを接続する加熱往き管と、前記ヒートポンプ式加熱手段の出口側と前記貯湯タンク上部とを接続する加熱戻り管と、前記加熱戻り管から分岐されて前記貯湯タンク下部に接続される分岐管と、前記ヒートポンプ式加熱手段からの湯を前記貯湯タンク上部に戻すか、前記分岐管を介して前記貯湯タンク下部に戻すかを切り替える切替手段と、前記加熱戻り管に設けられ前記ヒートポンプ式加熱手段で加熱された湯水の温度を検出する沸き上げ温度センサと、前記沸き上げ運転の開始からの時間経過に伴い前記沸き上げ温度センサで検出した温度が所定の切替温度以上となると、前記切替手段を前記貯湯タンク下部側から前記貯湯タンク上部側に切り替える切替制御手段と、過去複数日間の使用湯量を日毎に記憶する使用湯量記憶手段と、前記使用湯量記憶手段に記憶されている情報に基づいて使用状況を判断する使用状況判断手段と、を備え、
前記使用状況判断手段は、前記使用湯量記憶手段に記憶されている情報から使用湯量のバラツキ度合の値を算出し、前記バラツキ度合の値が所定値未満の場合に前記沸き上げ効率を優先する使用状況であると判断し、前記バラツキ度合の値が所定値以上の場合に前記高温の湯の確保を優先する使用状況であると判断するようにし、
前記切替制御手段は、前記使用状況判断手段の判断結果に基づいて、前記沸き上げ効率を優先する使用状況であると、前記高温の湯の確保を優先する使用状況であるときに比べて前記所定の切替温度を低い温度に決定するようにしたことを特徴とするヒートポンプ式給湯装置。 A hot water storage tank for storing hot water , a heat pump heating means for performing a heating operation for heating the hot water in the hot water storage tank to a preset temperature and storing hot water in the hot water storage tank, and the lower part of the hot water tank and the heat pump A heating forward pipe connecting the inlet side of the heating means, a heating return pipe connecting the outlet side of the heat pump heating means and the upper part of the hot water tank, and a branch from the heating return pipe to the lower part of the hot water tank a branch pipe connected, or the hot water from the heat pump type heating means back to the hot water storage tank top, switching means for switching between the back to the lower the hot water storage tank through the branch pipe provided in the heating return pipe a temperature sensor boiling detects the hot water temperature which has been heated by the heat pump type heating means, the boiling with the passage of time from the start of the water heating operation Switching control means for switching the switching means from the lower side of the hot water storage tank to the upper side of the hot water storage tank when the temperature detected by the raised temperature sensor is equal to or higher than a predetermined switching temperature, and usage for storing the amount of hot water used for the past multiple days every day Hot water storage means, and usage status determination means for determining the usage status based on information stored in the hot water storage means,
The use status determination means calculates a value of the degree of variation in the amount of hot water used from the information stored in the amount of hot water storage means, and uses the heating efficiency when the value of the degree of variation is less than a predetermined value. It is determined that it is a situation, and when the value of the variation degree is equal to or greater than a predetermined value, it is determined that it is a usage situation in which priority is given to securing the hot water,
The switching control means, based on the determination result of the usage status determination means, the usage status giving priority to the boiling efficiency, compared to the usage status giving priority to securing the hot water. A heat pump type hot water supply apparatus characterized in that the switching temperature is determined to be a low temperature . 湯水を貯湯する貯湯タンクと、前記貯湯タンク内の湯水を沸き上げ設定温度に加熱して前記貯湯タンクに積層状に貯湯する沸き上げ運転を行うヒートポンプ式加熱手段と、前記貯湯タンク下部と前記ヒートポンプ式加熱手段の入口側とを接続する加熱往き管と、前記ヒートポンプ式加熱手段の出口側と前記貯湯タンク上部とを接続する加熱戻り管と、前記加熱戻り管から分岐されて前記貯湯タンク下部に接続される分岐管と、前記ヒートポンプ式加熱手段からの湯を前記貯湯タンク上部に戻すか、前記分岐管を介して前記貯湯タンク下部に戻すかを切り替える切替手段と、前記加熱戻り管に設けられ前記ヒートポンプ式加熱手段で加熱された湯水の温度を検出する沸き上げ温度センサと、前記沸き上げ運転の開始からの時間経過に伴い前記沸き上げ温度センサで検出した温度が所定の切替温度以上となると、前記切替手段を前記貯湯タンク下部側から前記貯湯タンク上部側に切り替える切替制御手段と、過去複数日間の使用湯量を日毎に記憶する使用湯量記憶手段と、前記使用湯量記憶手段に記憶されている情報に基づいて使用状況を判断する使用状況判断手段と、前記貯湯タンク内の湯を熱源として浴槽水または暖房循環水を加熱する利用側熱交換器と、過去複数日間の利用側熱交換器の使用実績を表す値を日毎に記憶する熱交使用実績記憶手段と、を備え、
前記使用状況判断手段は、前記使用湯量記憶手段に記憶されている情報から使用湯量のバラツキ度合の値を算出し、前記バラツキ度合の値が所定値未満かつ前記熱交使用実績記憶手段に記憶された使用実績を表す値が所定値未満の場合に前記沸き上げ効率を優先する使用状況であると判断し、前記バラツキ度合の値が所定値以上か、または前記熱交使用実績記憶手段に記憶された使用実績を表す値が所定値以上の場合に、前記高温の湯の確保を優先する使用状況であると判断し、
前記切替制御手段は、前記使用状況判断手段の判断結果に基づいて、前記沸き上げ効率を優先する使用状況であると、前記高温の湯の確保を優先する使用状況であるときに比べて前記所定の切替温度を低い温度に決定するようにしたことを特徴とするヒートポンプ式給湯装置。 A hot water storage tank for storing hot water , a heat pump heating means for performing a heating operation for heating the hot water in the hot water storage tank to a preset temperature and storing hot water in the hot water storage tank, and the lower part of the hot water tank and the heat pump A heating forward pipe connecting the inlet side of the heating means, a heating return pipe connecting the outlet side of the heat pump heating means and the upper part of the hot water tank, and a branch from the heating return pipe to the lower part of the hot water tank A branch pipe to be connected; a switching means for switching whether the hot water from the heat pump heating means is returned to the upper part of the hot water storage tank or to the lower part of the hot water storage tank via the branch pipe; and the heating return pipe. a temperature sensor boiling detects the hot water temperature which has been heated by the heat pump type heating means, the boiling with the passage of time from the start of the water heating operation Switching control means for switching the switching means from the lower side of the hot water storage tank to the upper side of the hot water storage tank when the temperature detected by the raised temperature sensor is equal to or higher than a predetermined switching temperature, and usage for storing the amount of hot water used for the past multiple days every day Hot water storage means, usage status determination means for determining the usage status based on information stored in the hot water storage means, and a user side for heating the bathtub water or the heating circulating water using the hot water in the hot water storage tank as a heat source A heat exchanger and a heat exchange use record storage means for storing a value representing the use record of the use side heat exchanger in the past plural days for each day ,
The use status determining means calculates a value of the degree of variation in the amount of hot water used from the information stored in the amount of hot water storage means, and the value of the degree of variation is less than a predetermined value and is stored in the heat exchanger usage record storage means. When the value representing the actual usage record is less than the predetermined value, it is determined that the use efficiency is given priority to the boiling efficiency, and the variation degree value is equal to or greater than the predetermined value or stored in the heat exchanger usage record storage unit. When the value representing the actual use record is equal to or greater than a predetermined value, it is determined that the use situation gives priority to securing the hot water ,
The switching control means, based on the determination result of the usage status determination means, the usage status giving priority to the boiling efficiency, compared to the usage status giving priority to securing the hot water. A heat pump type hot water supply apparatus characterized in that the switching temperature is determined to be a low temperature .
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