JP2006207839A - Hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supply device, maintaining boiling efficiency of a heat pump unit 13 during hot water storage operation even if the hot water in a hot water storage tank 21 is used for heating operation to achieve boiling to a target temperature of boiling. <P>SOLUTION: During the heating operation, hot water taken out from one intermediate connecting port 23a of the hot water storage tank 21 is circulated to the other intermediate connecting port 23b of the hot water storage tank 21 through a heat exchanger 52 for heating of a heating circuit 56. The boiling efficiency of the heat pump unit 13 adapted to keep the temperature of water at the lower part of the hot water storage tank 21 low, and take out and boil the water at the lower part of the hot water storage tank 21 during hot water storage operation is maintained to achieve boiling to a target temperature of boiling. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hot water supply apparatus that uses hot water stored in a hot water storage tank for heating.

  2. Description of the Related Art Conventionally, there is a hot water supply device that stores hot water heated in a hot water storage tank and supplies hot water stored in the hot water storage tank.

  As means for boiling hot water stored in a hot water storage tank, there is a heat pump unit using a refrigerant circuit. In this heat pump unit, the water in the lower part of the hot water storage tank is taken out from the lower part of the hot water storage tank, boiled up through the heat exchanger for boiling of the heat pump unit, and the heated hot water is taken into the upper part of the hot water storage tank. Hot water is stored from the top of the hot water tank using the difference in specific gravity with water.

  In addition, when hot water is supplied, the hot water is generally taken out from the upper part of the hot water storage tank. In addition to being able to remove hot water from the upper part of the hot water storage tank, hot water can also be taken out from the intermediate part of the hot water storage tank so that the hot water at the upper part of the hot water storage tank can be switched and taken out by the switching means. There is a hot water supply device (for example, refer to Patent Document 1), and a hot water supply device in which hot water in an upper portion of a hot water storage tank and hot water in an intermediate portion can be mixed and taken out by a mixing valve.

There is also a hot water supply device that uses hot water stored in a hot water storage tank for heating such as floor heating. This hot water supply apparatus includes a heating circuit provided with a heat exchanger for heating and a heating panel. During the heating operation, the hot water taken out from the upper part of the hot water storage tank is sent to the heating heat exchanger to exchange heat. The medium temperature water whose temperature has dropped is returned to the lower part of the hot water storage tank (see, for example, Patent Document 2).
Japanese Patent Laying-Open No. 2003-161518 (page 4-5, FIG. 1) JP2003-240342A (5th page, FIG. 3)

  However, during the heating operation, the temperature of the water in the lower part of the hot water tank rises to return the medium temperature water whose temperature has been lowered by heat exchange in the heating heat exchanger to the lower part of the hot water tank, and then the hot water storage operation by the heat pump unit At that time, the medium-temperature water is taken out from the lower part of the hot water storage tank and boiled up by the heat pump unit, so that the boiling efficiency (COP) of the heat pump unit is lowered and it is difficult to boil up to the preset boiling target temperature. There is a problem to become.

  The present invention has been made in view of such points, and even when hot water in a hot water storage tank is used for heating operation, the boiling efficiency by the heat pump unit during hot water storage operation can be maintained, and the water is heated to the boiling target temperature. An object of the present invention is to provide a hot water supply device capable of performing the above.

  The hot water supply apparatus according to claim 1 is provided with an upper connection port at an upper portion, a lower connection port at a lower portion, and two intermediate connection ports at an intermediate portion between the upper connection port and the lower connection port. A hot water storage tank, a heat pump unit having a refrigerant circuit provided with a compressor, a heat exchanger for boiling and an evaporator, and a water heat exchanger for boiling of the heat pump unit for removing water taken out from a lower connection port of the hot water tank A hot water storage circuit that circulates to the upper connection port of the hot water storage tank, a heating circuit having a heat exchanger for heating, and heat exchange for heating of the heating circuit for hot water taken out from one intermediate connection port of the hot water storage tank And a heating circulation path that circulates to the other intermediate connection port of the hot water storage tank through the storage device.

  During the heating operation, the hot water taken out from one intermediate connection port of the hot water storage tank is circulated to the other intermediate connection port of the hot water storage tank through the heating heat exchanger of the heating circuit, thereby Since the temperature is kept low, the boiling efficiency of the heat pump unit that takes out and boiles water below the hot water storage tank during the subsequent hot water storage operation is maintained, and it is possible to boil up to the boiling target temperature.

  The hot water supply device according to claim 2 is the hot water supply device according to claim 1, wherein the flow path is switched between one intermediate connection port, a lower connection port of the hot water storage tank, and an inlet side of the boiling heat exchanger. Switching means for switching the flow path between the upper connecting port of the hot water storage tank, the outlet side of the heating heat exchanger, and the other intermediate connecting port of the hot water storage tank through the heating heat exchanger And the first switching means connect the lower connection port of the hot water storage tank to the inlet side of the boiling heat exchanger and the second switching means connects the upper connection port of the hot water storage tank and the boiling point during hot water storage operation. The hot water storage circulation path is formed by connecting to the outlet side of the heat exchanger for heating, and at the time of heating operation, one intermediate connection port of the hot water storage tank and the inlet side of the boiling heat exchanger are connected by the first switching means. And heating the outlet side of the boiling heat exchanger and heating with the second switching means In which by connecting the other intermediate connection opening of the hot water storage tank through the heat exchanger and a control section to form the heating circuit.

  During hot water storage operation, the first switching means connects the lower connection port of the hot water tank and the inlet side of the boiling heat exchanger, and the second switching means connects the upper connection port of the hot water tank and the heating heat. A hot water storage circuit is formed by connecting the outlet side of the exchanger, and at the time of heating operation, the first switching means connects one intermediate connection port of the hot water storage tank and the inlet side of the boiling heat exchanger. By connecting and connecting the outlet side of the boiling heat exchanger and the other intermediate connection port of the hot water storage tank through the heating heat exchanger by the second switching means to form a heating circulation path, A dedicated valve or the like is not necessary for taking out hot water from the middle part of the tank, and only the first and second switching means are required, and the configuration is simplified.

  The hot water supply apparatus according to claim 3 is the hot water supply apparatus according to claim 1 or 2, wherein the hot water supply apparatus is connected between the second switching means and the inlet side of the boiling heat exchanger, and the hot water storage device is connected through the second switching means. A hot water supply passage for supplying hot water taken out from either one of the upper connection port of the tank and one of the intermediate connection ports, and the control unit at the time of hot water supply, the upper connection port of the hot water storage tank and the heating heat One of the other intermediate connection ports of the hot water storage tank that has passed through the exchanger is connected to the hot water supply passage.

  And the hot water supply path was connected between the 2nd switching means and the inlet side of the heat exchanger for boiling, and it passed through the upper connection port of the hot water storage tank and the heat exchanger for heating by the 2nd switching means at the time of hot water supply. Hot water can be supplied by connecting one of the other intermediate connection ports of the hot water storage tank to the hot water supply passage, and there is no need for a dedicated valve for hot water supply from the upper and intermediate parts of the hot water storage tank. The second switching means used for operation is also used, and the configuration is simplified.

  The hot water supply device according to claim 4 is the hot water supply device according to claim 3, further comprising intermediate temperature detecting means for detecting the temperature of the hot water in the intermediate portion in the hot water storage tank, and the second switching means is provided on the hot water supply side. On the other hand, both the upper connection port side of the hot water storage tank and the other intermediate connection port side of the hot water storage tank through the heating heat exchanger can be opened and connected, and the ratio of each flow rate when both are opened The control valve is an adjustment valve that can be adjusted, and the temperature of the hot water at the intermediate portion in the hot water storage tank detected by the intermediate temperature detecting means when hot water is supplied is the temperature required to supply hot water at the hot water supply set temperature. If it is higher, the hot water taken out from the other intermediate connection port of the hot water tank is sent to the hot water supply passage by the adjusting valve, and if it is lower than the temperature required to supply hot water of the hot water set temperature, the upper connection of the hot water tank is made by the adjusting valve. Hot water and hot water tank taken out from the mouth It is intended to send to the hot water supply passage and mixed with hot water taken out from the other intermediate connection port.

  If the temperature of the hot water in the intermediate portion in the hot water storage tank detected by the intermediate temperature detecting means during hot water supply is higher than the temperature required to supply hot water at the hot water supply set temperature, the regulating valve that is the second switching means The hot water taken out from the other intermediate connection port of the hot water storage tank is sent to the hot water supply passage, and if it is lower than the temperature required to supply hot water at the hot water set temperature, the hot water taken out from the upper connection port of the hot water storage tank with the adjustment valve By mixing the hot water taken out from the other intermediate connection port of the hot water storage tank and sending it to the hot water supply path, the hot water below the intermediate part in the hot water storage tank is preferentially used, and hot water is added to the upper part of the hot water storage tank. I can leave.

  The hot water supply apparatus according to claim 5 is the hot water supply apparatus according to any one of claims 1 to 4, wherein the second switching means is connected to the upper connection port side of the hot water storage tank with respect to the outlet side of the boiling heat exchanger. It is an adjustment valve that allows both the open side of the hot water storage tank that has passed through the heat exchanger for heating to be connected to the other intermediate connection side and that can adjust the proportion of each flow rate when both are open. Is connected to the lower connection port of the hot water storage tank and the inlet side of the heating heat exchanger by the first switching means during the hot water storage heating operation in which the heating operation and the hot water storage operation are performed in parallel. Both the upper connection port side of the hot water storage tank and the other intermediate connection port side of the hot water storage tank that has passed through the heating heat exchanger are opened and connected to the outlet side of the boiling heat exchanger.

  During hot water storage heating operation, the first switching means connects the lower connection port of the hot water tank and the inlet side of the boiling heat exchanger, and the adjustment valve that is the second switching means uses the heating valve for boiling. By opening and connecting both the upper connection port side of the hot water storage tank and the other intermediate connection port side of the hot water storage tank that has passed through the heating heat exchanger, the first switching means and the second switching device By switching the switching means, heating operation and hot water storage operation can be performed simultaneously.

  The hot water supply device according to claim 6 is the hot water supply device according to claim 5, further comprising upper temperature detection means for detecting the temperature of the hot water in the upper part of the hot water storage tank, and the control unit detects the upper temperature during the heating operation. When the temperature of the upper part of the hot water storage tank detected by the means becomes lower than the temperature that can be raised by the heat pump unit, and the difference between these temperatures becomes wider than the preset temperature difference, it switches to hot water storage heating operation It is.

  And by continuing the heating operation, the temperature of the hot water in the middle part of the hot water storage tank is lowered, and further the temperature of the hot water in the upper part of the hot water storage tank is lowered, but the upper temperature of the hot water storage tank detected by the upper temperature detecting means is lowered. When the temperature becomes lower than the temperature that can be raised by the heat pump unit and the difference between the temperatures becomes wider than the preset temperature difference, the hot water taken into the upper part of the hot water storage tank is switched to hot water storage heating operation. Due to the temperature difference between the hot water and the intermediate temperature water, a mixed layer is formed between them, and hot water is stored in the hot water storage tank.

  According to the hot water supply apparatus of claim 1, during the heating operation, the hot water taken out from one intermediate connection port of the hot water storage tank is circulated to the other intermediate connection port of the hot water storage tank through the heating heat exchanger of the heating circuit. As a result, the temperature of the water in the lower part of the hot water storage tank can be maintained at a low temperature, so that the boiling efficiency of the heat pump unit that takes out the water in the lower part of the hot water tank during the subsequent hot water storage operation can be maintained. Can be raised.

  According to the hot water supply apparatus of claim 2, in addition to the effect of the hot water supply apparatus of claim 1, during the hot water storage operation, the lower switching port of the hot water storage tank and the inlet side of the boiling heat exchanger are switched by the first switching means. And a second switching means to connect the upper connection port of the hot water storage tank and the outlet side of the boiling heat exchanger to form a hot water storage circuit, and during heating operation, the first switching Means for connecting one intermediate connection port of the hot water storage tank and the inlet side of the heating heat exchanger, and the second switching means for passing through the outlet side of the heating heat exchanger and the heating heat exchanger. The other intermediate connection port can be connected to form a heating circulation path, so that a dedicated valve or the like is not required for taking out hot water from the intermediate portion of the hot water storage tank, and the first and second switching means The configuration can be simplified.

  According to the hot water supply device of claim 3, in addition to the effect of the hot water supply device of claim 1 or 2, a hot water supply path is connected between the second switching means and the inlet side of the boiling heat exchanger. When hot water is supplied, hot water can be supplied by connecting one of the upper connection port of the hot water storage tank and the other intermediate connection port of the hot water storage tank via the heating heat exchanger to the hot water supply passage with the second switching means. There is no need for a dedicated valve for supplying hot water from the upper part and the middle part of the water heater, so that the second switching means used for hot water storage operation and heating operation can be used together, and the configuration can be simplified.

  According to the hot water supply apparatus of claim 4, in addition to the effect of the hot water supply apparatus of claim 3, the temperature of the hot water in the intermediate portion in the hot water storage tank detected by the intermediate temperature detecting means during hot water supply is the hot water set temperature. If the temperature is higher than the temperature required to supply hot water, the hot water taken out from the other intermediate connection port of the hot water storage tank is sent to the hot water supply passage by the adjusting valve as the second switching means, and hot water at the hot water supply set temperature is supplied. If the temperature is lower than the required temperature, the hot water taken out from the upper connection port of the hot water storage tank and the hot water taken out from the other intermediate connection port of the hot water storage tank can be mixed and sent to the hot water supply channel by the adjustment valve. Hot water below the middle part of the hot water can be used with priority, leaving hot water in the upper part of the hot water storage tank.

  According to the hot water supply apparatus of claim 5, in addition to the effect of the hot water supply apparatus of any one of claims 1 to 4, the first switching means and the lower connection port of the hot water tank and the heat for boiling are heated by the first switching means during hot water storage heating operation. Connected to the inlet side of the exchanger and to the outlet side of the heat exchanger for boiling with the regulating valve as the second switching means, the upper connection port side of the hot water tank and the hot water tank passed through the heating heat exchanger By opening and connecting both of the other intermediate connection ports, heating operation and hot water storage operation can be performed simultaneously by switching between the first switching means and the second switching means.

  According to the hot water supply device of the sixth aspect, in addition to the effect of the hot water supply device of the fifth aspect, by continuing the heating operation, the temperature of the hot water in the intermediate portion of the hot water storage tank is lowered, and further, The temperature of the hot water also drops, but the temperature of the upper part of the hot water storage tank detected by the upper temperature detection means is lower than the temperature that can be raised by the heat pump unit, and the difference between these temperatures is greater than the preset temperature difference. By switching to hot water storage heating operation when it becomes wider, a mixed layer can be formed between the hot water taken in the upper part of the hot water tank and the intermediate temperature water in the middle part, and at the upper part of the hot water tank Can store hot water.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the hot water supply device 11 includes a main body unit 12, a heat pump unit 13, and a heating unit 14, and further, an automatic hot water filling function for automatically filling the bathtub 15 and the hot water filled in the bathtub 15. It has a tracking function to whisper.

  The main unit 12 has a hot water storage tank 21 for storing hot water. The hot water storage tank 21 is provided with an upper connection port 22, two intermediate connection ports 23a and 23b, and a lower connection port 24 at the upper, middle and lower portions, respectively. It has been. On the side surface of the hot water storage tank 21, a plurality of temperature detections for detecting the temperature of the hot water in the hot water storage tank 21 at respective height positions of, for example, 60L, 120L, 180L from the top of the hot water storage tank 21, and 30L, 60L from the bottom. Thermistors 25a to 25e as means are provided. The upper thermistor 25a is located at the upper part of the hot water storage tank 21, and functions as an upper temperature detecting means. The intermediate thermistors 25b and 25c are located in the intermediate part of the hot water storage tank 21 and above and below the intermediate connection ports 23a and 23b, and function as intermediate part temperature detection means.

  An upper pipe 27 is connected to the upper connection port 22 of the hot water storage tank 21, intermediate pipes 28a and 28b are connected to the intermediate connection ports 23a and 23b, and a lower pipe 29 is connected to the lower connection port 24. A water supply pipe 30 that is connected to a water supply source such as a water pipe is connected to a midway position of the lower pipe 29 via a pressure reducing valve 31.

  Between the hot water storage tank 21 and the heat pump unit 13, a heat pump pipe 33 for circulating hot water in the hot water storage tank 21 between the heat pump unit 13 is formed. The heat pump pipe 33 includes a forward pipe 34 through which hot water in the hot water storage tank 21 flows into the heat pump unit 13, a return pipe 35 through which hot water discharged from the heat pump unit 13 returns to the hot water storage tank 21, and hot water from the forward pipe 34 to the return pipe 35. A circulation pump 36 that circulates to flow is provided.

  A hot water supply pipe 39 of a hot water supply path 38 is connected to the return pipe 35 of the heat pump pipe 33.

  Between the one intermediate pipe 28a, the lower pipe 29, and the forward pipe 34 of the heat pump pipe 33, a three-way valve 41 is disposed as a first switching means for switching the flow path therebetween.

  Between the upper pipe 27, the other intermediate pipe 28b, the return pipe 35 of the heat pump pipe 33, and the hot water supply pipe 39 of the hot water supply path 38, there is an adjustment valve 42 as a second switching means for switching the flow path therebetween. It is arranged. The regulating valve 42 is a hot water storage position that opens only the upper connection port 22 side of the hot water storage tank 21, a heating position that opens only the other intermediate connection port 23b side of the hot water storage tank 21 that has passed through the heating heat exchanger 52, and a heat exchange for boiling. Both the upper connection port 22 side of the hot water storage tank 21 and the other intermediate connection port 23b side of the hot water storage tank 21 through the heating heat exchanger 52 are connected to the outlet side of the heater 46 and the hot water supply pipe 39 of the hot water supply passage 38. It is possible to switch to a hot water storage / heating position that can be opened and connected and that can adjust the ratio of each flow rate when both are opened. At the hot water storage / heating position, the ratio of each flow rate between the upper part and the middle part is, for example, 10%: 90%, 20%: 80%, ... 90%: 10%, etc. It may be variable in a plurality of stages, or may be continuously variable.

  A thermistor 42a is provided on the hot water supply passage 38 side of the adjustment valve 42 as hot water supply temperature detection means for detecting the temperature of hot water supplied from the adjustment valve 42 to the hot water supply passage 38.

  The heat pump unit 13 includes a refrigerant circuit 44 filled with a refrigerant. The refrigerant circuit 44 includes a compressor 45, a heat exchanger 46 for boiling that functions as a condenser, an expansion valve 47, an evaporator 48, A four-way valve 49 for switching the cycle between a normal cycle (forward cycle) and a reverse cycle is included. In the normal cycle, the refrigerant circulates in the order of the compressor 45, the boiling heat exchanger 46, the expansion valve 47, the evaporator 48, and the compressor 45, collects heat from the outside air in the evaporator 48, and heats the boiling heat exchanger 46. The water circulating through the heat pump pipe 33 is boiled. The reverse cycle is switched at the time of defrosting. In this reverse cycle, the refrigerant circulates in the order of the compressor 45, the evaporator 48, the expansion valve 47, the boiling heat exchanger 46, and the compressor 45, and heat exchange for boiling. Heat is collected from the hot water circulating through the heat pump pipe 33 by the evaporator 46, and the temperature of the evaporator 48 is raised to defrost. The compressor 45, the expansion valve 47, the evaporator 48 and the like are arranged in an outdoor unit 50 different from the main unit 12, and the boiling heat exchanger 46 and the like are arranged in the main unit 12.

  Further, the heating unit 14 includes, for example, a floor heating system, and includes a heating circuit 56 including a heating heat exchanger 52, a heating panel 53, a system turn 54, a heating circulation pump 55, and the like. The replacement circulating fluid is filled. The heating heat exchanger 52 of the heating circuit 56 is connected to a middle position of the other intermediate pipe 28b between the other intermediate connection port 23b of the hot water storage tank 21 and the regulating valve 42. The heating heat exchanger 52, the systern 54, the heating circulation pump 55, and the like are arranged in the main unit 12.

  The hot water supply pipe 30 and the hot water supply pipe 39 of the hot water supply path 38 are connected to the hot water supply electric mixing valve 57 and the bath electric mixing valve 58, respectively. The electric mixing valve 57 for hot water supply and the electric mixing valve 58 for bath mix the water from the water supply pipe 30 and the hot water from the hot water supply pipe 39, and are installed in a main remote controller installed in a kitchen or the like and in a bathroom, for example. Hot water is supplied at a hot water set temperature set by a bathroom remote controller.

  A flow rate sensor 60 for detecting the flow rate of hot water and a thermistor 61 for detecting the temperature of the hot water are disposed in a hot water supply tube 59 for supplying hot water from the electric mixing valve 57 for hot water supply to the kitchen or the like. In addition, a hopper 63 having a flow rate sensor for detecting the flow rate of hot water and a hot water temperature sensor for detecting the temperature of hot water is disposed in the hot water supply pipe 62 for supplying hot water from the electric mixing valve 58 for bath to the bathtub 15. Has been.

  In addition, a bath heat exchanger 65 is arranged in the upper part of the hot water storage tank 21 and between the upper connection port 22 and the intermediate connection ports 23a and 23b. The bath heat exchanger 65 and the bathtub 15 are used for the bath. They are connected by a forward path 67 and a return path 68 of the circulation path 66. A circulation pump 69 for bath that circulates bath water is provided in the forward path 67. A bath hot water supply pipe 62 is connected to the bath circulation path 66 via a bath three-way valve 70, and automatic hot water filling and automatic hot water for the bathtub 15 are possible.

  The main unit 12 includes a controller 75 that controls the hot water supply device 11. This control unit 75 receives signals from detection means such as sensors and thermistors (25a to 25e), heat pump unit 13, heating unit 14, three-way valve 41, regulating valve 42, mixing valves 57 and 58, for bath Controls circulation pump 69, three-way valve 70 for bath, and the like.

  The control unit 75 has the following functions.

  During hot water storage operation, the three-way valve 41 connects the lower connection port 24 of the hot water storage tank 21 to the inlet side of the heating heat exchanger 46 and the adjustment valve 42 exchanges heat with the upper connection port 22 of the hot water storage tank 21 and heating. The function of connecting the outlet side of the vessel 46 to form a hot water storage circulation path 81. In the hot water storage circulation path 81, water taken out from the lower connection port 24 of the hot water storage tank 21 is circulated to the upper connection port 22 of the hot water storage tank 21 through the boiling heat exchanger 46.

  During heating operation, the three-way valve 41 connects one intermediate connection port 23a of the hot water storage tank 21 to the inlet side of the heating heat exchanger 46 and the adjustment valve 42 heats the outlet side of the boiling heat exchanger 46 and the heating side. A function of forming a heating circulation path 82 by connecting the other intermediate connection port 23b of the hot water storage tank 21 that has passed through the heat exchanger 52 for heating. In the heating circulation path 82, hot water taken out from one intermediate connection port 23a of the hot water storage tank 21 is circulated through the heating heat exchanger 52 of the heating circuit 56 to the other intermediate connection port 23b of the hot water storage tank 21.

  The function of connecting the hot water supply path 38 with either the upper connection port 22 of the hot water storage tank 21 or the other intermediate connection port 23b of the hot water storage tank 21 that has passed through the heating heat exchanger 52 with the adjustment valve 42 during hot water supply. If the temperature of the intermediate hot water in the hot water storage tank 21 detected by the intermediate thermistor 25c is higher than the temperature required to supply hot water at the hot water set temperature, the other intermediate connection of the hot water storage tank 21 with the regulating valve 42 The hot water taken out from the port 23b is sent to the hot water supply passage 38, and if it is lower than the temperature required to supply hot water at the hot water supply set temperature, the hot water taken out from the upper connection port 22 of the hot water storage tank 21 by the regulating valve 42 and the hot water storage tank 21 A function of mixing the hot water taken out from the other intermediate connection port 23b and sending it to the hot water supply path 38.

  During hot water storage heating operation, the three-way valve 41 connects the lower connection port 24 of the hot water storage tank 21 to the inlet side of the boiling heat exchanger 46 and the adjustment valve 42 to the outlet side of the boiling heat exchanger 46 A function of opening and connecting both the upper connection port 22 side of the hot water storage tank 21 and the other intermediate connection port 23b side of the hot water storage tank 21 through the heating heat exchanger 52.

  During the heating operation, the temperature of the upper part of the hot water storage tank 21 detected by the upper thermistor 25a is lower than the temperature that can be raised by the heat pump unit 13, and the temperature difference between them is wider than the preset temperature difference. When switching to hot water storage heating.

  During the defrosting operation, the three-way valve 41 connects one intermediate connection port 23a of the hot water storage tank 21 to the inlet side of the boiling heat exchanger 46 and the adjustment valve 42 connects the outlet side of the boiling heat exchanger 46 to the outlet side. A function of forming the same flow path as the heating circulation path 82 by connecting the other intermediate connection port 23b of the hot water storage tank 21 that has passed through the heat exchanger 52 for heating.

  FIG. 2 shows the relationship between each state of such operation and operation and the positions of the three-way valve 41 and the regulating valve 42. “Normal” indicates an operation position only in each state, and “hot water supply” indicates a case where hot water is supplied during each state. The three-way valve 41 indicates the position of hot water to be taken out from the hot water storage tank 21, the adjustment valve 42 indicates each position of hot water storage, heating, and hot water storage heating, the water temperature indicates the supply water temperature, and the hot water storage heating of the adjustment valve 42 is the thermistor above 60L. The ratio of each flow rate is adjusted according to the temperature detected by the thermistor 25c in the middle of 25a and 180L.

  Next, the operation of the present embodiment will be described.

  First, the hot water storage operation will be described with reference to FIG.

  The three-way valve 41 connects the lower connection port 24 of the hot water storage tank 21 and the inlet side of the boiling heat exchanger 46, and the upper connection port 22 of the hot water storage tank 21 and the boiling heat exchanger with the regulating valve 42 as the hot water storage position. The outlet side of 46 is connected to form a hot water storage circulation path 81.

  After the compressor 45 of the heat pump unit 13 is started to operate, the circulation pump 36 located in the hot water storage circuit 81 is driven, and the water taken out from the lower connection port 24 of the hot water storage tank 21 is used as the heat for raising the heat pump unit 13. The hot water boiled in the boiling heat exchanger 46 is circulated to the upper connection port 22 of the hot water storage tank 21 after being sent to the exchanger 46 and heated to the boiling target temperature. Hot water taken into the upper part of the hot water storage tank 21 is stored in order from the upper part of the hot water storage tank 21 downward.

  Next, a hot water supply operation from the upper part of the hot water storage tank 21 will be described in FIG. 4 when the hot water supply set temperature is set to use a dishwasher, for example.

  The upper connection port 22 of the hot water storage tank 21 and the hot water supply pipe 39 of the hot water supply path 38 are connected with the regulating valve 42 as the hot water storage position.

  For example, when hot water is used in a dishwasher or the like, hot water is discharged from the hot water supply pipe 59 and hot water taken out from the upper connection port 22 of the hot water storage tank 21 is supplied through the hot water supply path 38, the electric mixing valve 57 for hot water supply, and the like.

  In addition, when hot water is added to the bathtub 15 or hot water is added, hot water is discharged from the hot water supply pipe 62 for bath, hot water taken out from the upper connection port 22 of the hot water storage tank 21 by the electric mixing valve 58 for bath, and water supplied from the water supply pipe 30. And hot water having a bath set temperature is supplied to the bathtub 15.

  Next, in FIG. 5, a hot water supply operation for supplying hot hot water when the hot water supply set temperature is set to medium hot water will be described.

  If the temperature of the hot water in the intermediate part of the hot water storage tank 21 detected by the intermediate thermistor 25c is higher than the temperature required to supply hot water at the hot water supply set temperature, the intermediate hot water supply only in the intermediate part of the hot water storage tank 21 Let it be in the state of hot water supply. For example, when the temperature required to supply hot water at the hot water supply set temperature is set to the hot water supply set temperature + 5 ° C., if the temperature of the hot water in the intermediate portion of the hot water storage tank 21 detected by the intermediate thermistor 25c is higher than this temperature, Let the state of the intermediate hot water supply.

  In the intermediate hot water supply, the adjustment valve 42 is set to the heating position, and the other intermediate connection port 23b of the hot water storage tank 21 that has passed through the heating heat exchanger 52 is connected to the hot water supply path 38.

  When hot water is used in a shower in the kitchen or bathroom, the hot water is discharged from the hot water supply pipe 59, and hot water taken out from the intermediate connection port 23b of the hot water storage tank 21 by the hot water supply electric mixing valve 57 and supplied from the water supply pipe 30 as necessary. Water is mixed with water to supply hot water at the set temperature.

  Similarly, when hot water is added to the bathtub 15 or hot water is added, the hot water is discharged from the hot water supply pipe 62 for bath, the hot water taken out from the intermediate connection port 23b of the hot water storage tank 21 by the electric mixing valve 58 for bath, and the hot water supply pipe 30 as required. The hot water at the bath set temperature is supplied to the bathtub 15 by mixing with the water supplied from the hot water.

  If the temperature of the hot water in the intermediate portion of the hot water storage tank 21 detected by the intermediate thermistor 25c is lower than the temperature required to supply hot water at the hot water set temperature, the hot water in the upper portion of the hot water storage tank 21 and the intermediate portion It is set as the state of the mixed hot water supply which mixes with hot water and supplies hot water. For example, when the temperature required to supply hot water at the hot water supply set temperature is set to the hot water supply set temperature + 5 ° C., if the temperature of the hot water in the intermediate portion of the hot water storage tank 21 detected by the intermediate thermistor 25c is lower than this temperature, Let the state of mixed hot water supply.

  In the mixed hot water supply, the regulating valve 42 is set to the hot water storage / heating position, and with respect to the hot water supply path 38, the upper connection port 22 side of the hot water storage tank 21 and the other intermediate connection port 23b side of the hot water storage tank 21 through the heating heat exchanger 52 Open both and adjust the ratio of each flow rate of hot water flowing from both. The ratio of each flow rate is determined based on the hot water supply set temperature, the temperature detected by the upper thermistor 25a, and the temperature detected by the intermediate thermistor 25c. To do.

  At this time, the ratio X taken out from the upper part of the hot water storage tank 21 is X = {(target hot water supply temperature−temperature detected by the intermediate thermistor 25c) · 10} ÷ (temperature detected by the upper thermistor 25a−intermediate part) Temperature detected by the thermistor 25c). The hot water supply target temperature is set to the hot water supply set temperature + 5 ° C. For example, assuming that the hot water supply set temperature is 42 ° C., the temperature detected by the upper thermistor 25a is 75 ° C., and the temperature detected by the middle thermistor 25c is 43 ° C., X = (42 ° C. + 5 ° C.−43 ° C.). 10 ÷ (75 ° C.−43 ° C.) = 1.25, and the ratio of taking out from the upper part of the hot water storage tank 21 is 1.25. When the ratio is changed in units of 10%, the upper part is 20%: the middle is 80%.

  When hot water is used in a shower in the kitchen or bathroom, the hot water is discharged from the hot water supply pipe 59, and the hot water taken out from the upper connection port 22 of the hot water storage tank 21 and the hot water taken out from the other intermediate connection port 23b of the hot water storage tank 21 are mixed. The hot water supply passage 38 is mixed with water supplied from the water supply pipe 30 as necessary by the hot water supply electric mixing valve 57 to supply hot water at a hot water supply set temperature.

  Similarly, when hot water is added to the bathtub 15 or hot water is added, the hot water discharged from the hot water supply pipe 62 for bath is taken out from the upper connection port 22 of the hot water storage tank 21 and the hot water taken out from the other intermediate connection port 23b of the hot water storage tank 21. Are mixed and sent to the hot water supply path 38, and water supplied from the water supply pipe 30 is mixed as necessary by the electric mixing valve 58 for bath to supply hot water having a bath set temperature to the bathtub 15.

  When the adjustment valve 42 is supplying hot water at the hot water storage / heating position, the hot water supply temperature is regularly monitored by the thermistor 61 of the hot water supply pipe 59, the hot water supply temperature sensor of the hopper 63, and the ratio of the adjustment valve 42 is corrected. For example, when the hot water supply temperature is lower than the hot water supply set temperature + 5 ° C., the ratio of taking out hot water from the upper part of the hot water storage tank 21 is increased, and when the hot water supply temperature is higher than the hot water supply set temperature + 15 ° C., hot water is supplied from the upper part of the hot water storage tank 21. Eliminate the rate of taking out each.

  Next, in FIG. 6, the heating operation in the case where the temperature of the hot water in the intermediate portion of the hot water storage tank 21 detected by the thermistor 25c in the intermediate portion is higher than the temperature that can be used for heating will be described.

  A three-way valve 41 connects one intermediate connection port 23a of the hot water storage tank 21 to the inlet side of the heating heat exchanger 46, and uses the regulating valve 42 as a heating position to heat the outlet side of the boiling heat exchanger 46 and for heating. A heating circulation path 82 is formed by connecting the other intermediate connection port 23b of the hot water storage tank 21 that has passed through the heat exchanger 52.

  The circulation pump 36 located in the heating circulation path 82 is driven, and the hot water taken out from one intermediate connection port 23a of the hot water storage tank 21 is passed through the heating heat exchanger 52 of the heating circuit 56 and the other hot water storage tank 21 is heated. Circulate through the intermediate connection port 23b.

  In the heating unit 14, the heating circulation pump 55 of the heating circuit 56 is driven, and the circulating fluid in the cistern 54 is sent to the heating heat exchanger 52 to exchange heat with the hot water in the hot water storage tank 21 to increase the temperature. The circulating fluid whose temperature has risen is sent to the heating panel 53 to be heated, and the circulating fluid whose temperature has decreased by passing through the heating panel 53 is returned to the cistern 54.

  By the way, as shown in FIG. 7, by continuing the heating operation in which the hot water whose temperature has been lowered through the heating heat exchanger 52 is returned to the intermediate portion of the hot water storage tank 21 through the other intermediate connection port 23b, Since the temperature of the hot water in the middle part is lowered, a mixed layer at the boundary between the high temperature water and the middle temperature water in the upper part of the hot water storage tank 21 cannot be formed, and the temperature of the hot water in the upper part of the hot water storage tank 21 is also lowered. When the temperature of the hot water in the upper part of the hot water storage tank 21 falls, the hot water in the upper part of the hot water storage tank 21 in which the bath heat exchanger 65 is arranged is low when the hot water filled in the bathtub 15 is chased away. Insufficient ability to chase and keep warm. In this case, it is only necessary to switch to hot water storage heating operation in which hot water storage operation is performed in parallel with the heating operation, but when there is little difference between the temperature of the hot water in the upper part of the hot water storage tank 21 and the temperature that can be heated by the heat pump unit 13 When started, even if the hot water boiled by the heat pump unit 13 is put in the upper part of the hot water storage tank 21, the mixed layer is not formed and mixed.

  Therefore, the temperature of the upper part of the hot water storage tank 21 detected by the upper thermistor 25a is lower than the temperature at which the heat pump unit 13 can boil up, and the temperature difference between those temperatures is set in advance, for example, 15-30 ° C. When the difference becomes wide, switch to hot water storage heating operation.

  Next, the hot water storage / heating operation will be described with reference to FIG.

  The three-way valve 41 connects the lower connection port 24 of the hot water storage tank 21 to the inlet side of the boiling heat exchanger 46, and the regulating valve 42 is used as a hot water heating position to store hot water with respect to the outlet side of the boiling heat exchanger 46. Both the upper connection port 22 side of the tank 21 and the other intermediate connection port 23b side of the hot water storage tank 21 through the heating heat exchanger 52 are opened, and the ratio of each flow rate of hot water flowing from both is adjusted. The ratio of each flow rate is determined based on the hot water supply set temperature, the temperature detected by the upper thermistor 25a, and the temperature detected by the intermediate thermistor 25c. To do.

  After the compressor 45 of the heat pump unit 13 is started to operate, the circulation pump 36 located in the hot water storage circuit 81 is driven, and the water taken out from the lower connection port 24 of the hot water storage tank 21 is used as the heat for raising the heat pump unit 13. The water is fed to the exchanger 46 and heated to the boiling target temperature, and the hot water boiled by the boiling heat exchanger 46 is fed to the regulating valve 42. In the regulating valve 42, the ratio of the flow rate to the upper connection port 22 side and the other intermediate connection port 23b side through the heating heat exchanger 52 is adjusted, and hot water passes through the heating heat exchanger 52 in the heating circuit 56. While circulating to the other intermediate connection port 23 b of the hot water storage tank 21, hot water circulates to the upper connection port 22 of the hot water storage tank 21 and stores hot water in the upper part of the hot water storage tank 21. For example, the ratio of the flow rate to the upper connection port 22 side by the regulating valve 42 and the other intermediate connection port 23b side through the heating heat exchanger 52 is as follows: hot water storage 7: heating 3, midnight after 23:00 in the daytime The time zone shall be hot water storage 5: heating 5.

  In the heating unit 14, the heating circulation pump 55 of the heating circuit 56 is driven, and the circulating fluid in the cistern 54 is sent to the heating heat exchanger 52 to exchange heat with the hot water in the hot water storage tank 21 to increase the temperature. The circulating fluid whose temperature has risen is sent to the heating panel 53 to be heated, and the circulating fluid whose temperature has decreased by passing through the heating panel 53 is returned to the cistern 54.

  And since hot water enters the upper part of the hot water storage tank 21 and intermediate hot water whose temperature has been lowered through the heat exchanger 52 for heating enters the intermediate part, during the hot water storage heating operation, the upper part and the intermediate part of the hot water storage tank 21 A sufficient temperature difference can be made between them, and a mixed layer can be formed, so that the hot water temperature at the upper part of the hot water storage tank 21 can be kept high.

  After that, if hot water is stored up to the vicinity of the middle part of the hot water storage tank 21, the hot water temperature at the upper part of the hot water storage tank 21 can be kept high because the mixed layer is formed even if the hot water heating operation is changed to the heating operation.

  Therefore, when the hot water filled in the bathtub 15 is chased, the hot water temperature at the upper part of the hot water storage tank 21 where the bath heat exchanger 65 is arranged is high, so that sufficient capacity for chasing and keeping warm is obtained. It is done.

  In addition, when the heating reaches a predetermined temperature during this hot water storage hot water operation, the flow of hot water to the heat exchanger 52 for heating is stopped by the regulating valve 42, and hot water is poured only into the upper part of the hot water storage tank 21, The time for raising the temperature of the hot water in the upper part of the hot water storage tank 21 can be shortened.

  Next, in FIG. 9, a hot water supply operation for supplying hot medium water during heating operation will be described.

  During heating operation, the three-way valve 41 connects one intermediate connection port 23a of the hot water storage tank 21 to the inlet side of the boiling heat exchanger 46, and the outlet of the boiling heat exchanger 46 with the regulating valve 42 as the heating position. Side and the other intermediate connection port 23b of the hot water storage tank 21 through the heating heat exchanger 52 are connected to form a heating circulation path 82.

  The circulation pump 36 located in the heating circulation path 82 is driven, and the hot water taken out from one intermediate connection port 23a of the hot water storage tank 21 is passed through the heating heat exchanger 52 of the heating circuit 56 and the other hot water storage tank 21 is heated. Circulate through the intermediate connection port 23b.

  In the heating unit 14, the heating circulation pump 55 of the heating circuit 56 is driven, and the circulating fluid in the cistern 54 is sent to the heating heat exchanger 52 to exchange heat with the hot water in the hot water storage tank 21 to increase the temperature. The circulating fluid whose temperature has risen is sent to the heating panel 53 to be heated, and the circulating fluid whose temperature has decreased by passing through the heating panel 53 is returned to the cistern 54.

  During this heating operation, if hot water is used in a shower in the kitchen or bathroom, etc., or if hot water is added to the bathtub 15 or hot water is discharged from the hot water supply path 38, the hot water storage tank 21 detected by the thermistor 25c in the middle part If the temperature of the hot water in the intermediate part is higher than the temperature required to supply hot water at the hot water supply set temperature, the regulating valve 42 is maintained in the heating position so that only hot water in the intermediate part of the hot water storage tank 21 is supplied. For example, if the temperature required to supply hot water at the hot water supply set temperature is set to the hot water supply set temperature + 5 ° C., the temperature of the hot water in the intermediate portion of the hot water storage tank 21 detected by the thermistor 25c at the intermediate portion from this temperature is −5 ° C. If it is high, the regulating valve 42 is maintained in the heating position. Therefore, hot water taken out from one intermediate connection port 23a of the hot water storage tank 21 flows into the hot water supply path 38, and hot water that has been taken out from the other intermediate connection port 23b of the hot water storage tank 21 and lowered in temperature through the heating heat exchanger 52 is obtained. It flows into the hot water supply path 38.

  If the temperature of the hot water in the intermediate portion of the hot water storage tank 21 detected by the intermediate thermistor 25c is lower than the temperature required to supply hot water at the hot water set temperature, the hot water in the upper portion of the hot water storage tank 21 and the intermediate portion The adjustment valve 42 is switched to the hot water storage / heating position so as to mix and supply hot water. For example, if the temperature required to supply hot water at the hot water supply set temperature is set to the hot water supply set temperature + 5 ° C., the temperature of the hot water in the intermediate portion of the hot water storage tank 21 detected by the thermistor 25c at the intermediate portion from this temperature is −5 ° C. If low, the control valve 42 is switched to the hot water storage / heating position.

  By setting the adjustment valve 42 to the hot water storage / heating position, with respect to the hot water supply path 38, the upper connection port 22 side of the hot water storage tank 21 and the other intermediate connection port 23b side of the hot water storage tank 21 through the heat exchanger 52 for heating are used. Open both and adjust the ratio of each flow rate of hot water flowing from both. As a result, the hot water taken out from one intermediate connection port 23a of the hot water storage tank 21 flows into the hot water supply passage 38, and is taken out from the other intermediate connection port 23b of the hot water storage tank 21 by the adjustment valve 42 and passed through the heating heat exchanger 52. Hot water, which is a mixture of hot water whose temperature has dropped and hot water (hot water) taken out from the upper connection port 22, flows into the hot water supply path 38. The ratio is adjusted by the adjustment valve 42 so that the temperature of the hot water flowing through the hot water supply passage 38 becomes higher than the temperature required to supply hot water at the hot water supply set temperature. When hot water is supplied, hot water in the hot water storage tank 21 flows in the opposite direction to that during normal heating operation with respect to the heating heat exchanger 52, and when hot water supply stops, the hot water storage tank 21 is in contact with the heating heat exchanger 52. No hot water flows in the direction of normal heating operation.

  Next, the defrosting operation in the case where frost is attached to the evaporator 48 during the operation of the heat pump unit 13 will be described with reference to FIG.

  A three-way valve 41 connects one intermediate connection port 23a of the hot water storage tank 21 to the inlet side of the heating heat exchanger 46, and uses the regulating valve 42 as a heating position to heat the outlet side of the boiling heat exchanger 46 and for heating. The other intermediate connection port 23b of the hot water storage tank 21 that has passed through the heat exchanger 52 is connected to form the same flow path as the heating circulation path 82.

  The circulation pump 36 located in the heating circulation path 82 is driven, and the hot water taken out from one intermediate connection port 23a of the hot water storage tank 21 is sent to the boiling heat exchanger 46 of the heat pump unit 13 to heat the boiling heat. The temperature of the exchanger 46 is raised to defrost. The hot water whose temperature has dropped through the boiling heat exchanger 46 is circulated to the other intermediate connection port 23b of the hot water storage tank 21.

  As described above, according to the hot water supply device 11, during the heating operation, the hot water taken out from one intermediate connection port 23a of the hot water storage tank 21 passes through the heating heat exchanger 52 of the heating circuit 56 and the other intermediate of the hot water storage tank 21. By circulating through the connection port 23b, the water temperature in the lower part of the hot water storage tank 21 can be maintained at a low temperature, so that the boiling efficiency of the heat pump unit 13 that keeps the water under the hot water storage tank 21 taken out and heated during the subsequent hot water storage operation is maintained. Can be raised to the boiling target temperature.

  Moreover, hot water storage operation, hot water supply, heating operation, hot water storage heating operation, defrosting operation, etc. can be switched only by the three-way valve 41 and the regulating valve 42, and hot water can be taken out from the intermediate connection ports 23a, 23b of the hot water storage tank 21. In addition, a special valve or the like is not required for taking out hot water from the intermediate portion of the hot water storage tank 21, and the configuration can be simplified.

  That is, at the time of hot water storage operation, the three-way valve 41 connects the lower connection port 24 of the hot water storage tank 21 and the inlet side of the heating heat exchanger 46 and the adjustment valve 42 connects to the upper connection port 22 of the hot water storage tank 21 and the heating port. A hot water storage circulation path 81 is formed by connecting the outlet side of the heat exchanger 46, and at the time of heating operation, the one-way connection port 23a of the hot water storage tank 21 and the boiling heat exchanger 46 are connected by the three-way valve 41. Connecting the inlet side and connecting the outlet side of the boiling heat exchanger 46 and the other intermediate connection port 23b of the hot water storage tank 21 via the heating heat exchanger 52 with the regulating valve 42, the heating circulation path 82 Therefore, there is no need for a dedicated valve or the like for taking out hot water from the intermediate portion of the hot water storage tank 21, and only the three-way valve 41 and the regulating valve 42 are required, and the configuration can be simplified.

  In addition, a hot water supply path 38 is connected between the regulating valve 42 and the inlet side of the boiling heat exchanger 46, and the upper connection port 22 of the hot water storage tank 21 and the heating heat exchanger 52 are connected by the regulating valve 42 during hot water supply. Hot water can be supplied by connecting one of the other intermediate connection ports 23b of the hot water storage tank 21 and the hot water supply passage 38, and there is no need for a dedicated valve for supplying hot water from the upper part and the intermediate part of the hot water storage tank 21, The adjustment valve 42 used for hot water storage operation and heating operation can also be used, and the configuration can be simplified.

  At the time of this hot water supply, if the temperature of the intermediate hot water in the hot water storage tank 21 detected by the intermediate thermistor 25c is higher than the temperature required to supply hot water at the hot water supply set temperature, the other side of the hot water storage tank 21 is adjusted by the adjusting valve 42. The hot water taken out from the intermediate connection port 23b is sent to the hot water supply passage 38, and if it is lower than the temperature required to supply hot water at the hot water set temperature, the hot water taken out from the upper connection port 22 of the hot water storage tank 21 with the regulating valve 42 The hot water taken out from the other intermediate connection port 23b of the hot water storage tank 21 can be mixed and sent to the hot water supply path 38. The hot water in the hot water tank 21 or lower is preferentially used, and the hot water in the hot water storage tank 21 is used. Hot water can be left at the top.

  Further, during hot water storage heating operation, the three-way valve 41 connects the lower connection port 24 of the hot water storage tank 21 to the inlet side of the boiling heat exchanger 46 and the regulating valve 42 connects to the outlet side of the boiling heat exchanger 46. On the other hand, by opening and connecting both the upper connection port 22 side of the hot water storage tank 21 and the other intermediate connection port 23b side of the hot water storage tank 21 through the heating heat exchanger 52, the three-way valve 41 and the regulating valve 42 By switching, heating operation and hot water storage operation can be performed simultaneously.

  By continuing this heating operation, the temperature of the hot water in the middle part of the hot water storage tank 21 is lowered and the temperature of the hot water in the upper part of the hot water storage tank 21 is also lowered, but the temperature of the hot water storage tank 21 detected by the upper thermistor 25a is lowered. When the temperature of the upper part becomes lower than the temperature that can be raised by the heat pump unit 13 and the difference in temperature becomes wider than the preset temperature difference, the hot water storage tank 21 Due to the temperature difference between the hot water taken in and the intermediate warm water in the middle, a mixed layer can be formed between them, and hot water can be stored in the upper part of the hot water storage tank 21.

It is a lineblock diagram of a hot-water supply device showing one embodiment of the present invention. It is a table | surface which shows the relationship between each operation | movement of each hot water supply apparatus same as the above, and the state of each operation | movement, and a three-way valve and a regulating valve. It is explanatory drawing of the hot water storage driving | operation of a hot-water supply apparatus same as the above. It is explanatory drawing of the high-temperature water hot-water supply operation | movement of a hot-water supply apparatus same as the above. It is explanatory drawing of the middle temperature hot water supply operation | movement of a hot-water supply apparatus same as the above. It is explanatory drawing of the heating operation of a hot-water supply apparatus same as the above. It is a graph which shows the change of the temperature of each thermistor at the time of the heating operation of a hot-water supply apparatus same as the above. It is explanatory drawing of the hot water storage heating operation of a hot-water supply apparatus same as the above. It is explanatory drawing of the medium temperature hot water supply operation | movement at the time of the heating operation of a hot-water supply apparatus same as the above. It is explanatory drawing of the defrost operation of a hot-water supply apparatus same as the above.

Explanation of symbols

11 Water heater
13 Heat pump unit
21 Hot water storage tank
22 Upper connection port
23a, 23b Intermediate connection port
24 Bottom connection port
25a Thermistor as upper temperature detection means
25b, 25c Thermistor as intermediate temperature detection means
38 Hot water supply path
41 Three-way valve as first switching means
42 Regulating valve as second switching means
44 Refrigerant circuit
45 Compressor
46 Heat exchanger for boiling
48 Evaporator
52 Heat exchanger for heating
56 Heating circuit
75 Control unit
81 Hot water storage circuit
82 Heating circuit

Claims (6)

An upper connection port is provided at the upper part, a lower connection port is provided at the lower part, and a hot water storage tank provided with two intermediate connection ports in an intermediate part between these upper connection port and lower connection port;
A heat pump unit having a refrigerant circuit provided with a compressor, a boiling heat exchanger and an evaporator;
A hot water storage circuit that circulates water taken from the lower connection port of the hot water storage tank to the upper connection port of the hot water storage tank via the heat exchanger for boiling of the heat pump unit;
A heating circuit having a heat exchanger for heating;
A heating circuit that circulates hot water taken out from one intermediate connection port of the hot water storage tank to the other intermediate connection port of the hot water storage tank via a heating heat exchanger of the heating circuit. Hot water supply device. First switching means for switching the flow path between one intermediate connection port and lower connection port of the hot water storage tank and the inlet side of the boiling heat exchanger;
Second switching means for switching the flow path between the upper connection port of the hot water storage tank, the outlet side of the heating heat exchanger, and the other intermediate connection port of the hot water storage tank through the heating heat exchanger;
During the hot water storage operation, the first switching means connects the lower connection port of the hot water tank and the inlet side of the boiling heat exchanger, and the second switching means exchanges the upper connection port of the hot water tank and the boiling heat exchange. The hot water storage circulation path is formed by connecting the outlet side of the storage device, and one intermediate connection port of the hot water storage tank and the inlet side of the boiling heat exchanger are connected by the first switching means during heating operation. And a controller for connecting the outlet side of the boiling heat exchanger and the other intermediate connection port of the hot water storage tank through the heating heat exchanger to form a heating circulation path by the second switching means. The hot water supply apparatus according to claim 1, wherein Connected between the second switching means and the inlet side of the boiling heat exchanger, hot water taken out from either the upper connection port of the hot water storage tank or one of the intermediate connection ports through the second switching means. A hot water supply path for hot water supply,
The controller is configured to connect, at the time of hot water supply, one of the upper connection port of the hot water storage tank and the other intermediate connection port of the hot water storage tank through the heating heat exchanger and the hot water supply path by the second switching means. The hot water supply apparatus according to claim 1 or 2. An intermediate temperature detecting means for detecting the temperature of the hot water in the intermediate part in the hot water storage tank is provided,
The second switching means allows both the upper connection port side of the hot water storage tank side and the other intermediate connection port side of the hot water storage tank through the heating heat exchanger to be connected to the hot water supply channel side and both of them. It is a regulating valve that makes it possible to adjust the ratio of each flow rate when opening
When the temperature of the hot water in the intermediate portion in the hot water storage tank detected by the intermediate temperature detecting means is higher than the temperature required to supply hot water at the hot water supply set temperature during hot water supply, The hot water taken out from the other intermediate connection port is sent to the hot water supply passage, and if it is lower than the temperature required to supply hot water at the hot water set temperature, the hot water taken out from the upper connection port of the hot water storage tank and the hot water storage tank The hot water supply apparatus according to claim 3, wherein the hot water taken out from the other intermediate connection port is mixed and sent to the hot water supply path. The second switching means opens both the upper connection port side of the hot water storage tank and the other intermediate connection port side of the hot water storage tank through the heating heat exchanger with respect to the outlet side of the boiling heat exchanger. It is a regulating valve that can be connected and can adjust the ratio of each flow rate when both of them are opened.
The control unit connects the lower connection port of the hot water storage tank and the inlet side of the boiling heat exchanger with the first switching means during the hot water storage heating operation in which the heating operation and the hot water storage operation are performed in parallel. It is characterized in that both the upper connection port side of the hot water storage tank and the other intermediate connection port side of the hot water storage tank through the heating heat exchanger are opened and connected to the outlet side of the boiling heat exchanger with a valve. The hot water supply apparatus according to any one of claims 1 to 4. It has an upper temperature detection means for detecting the temperature of the upper hot water in the hot water storage tank,
The controller is configured such that, during the heating operation, the temperature of the upper portion of the hot water storage tank detected by the upper temperature detecting means is lower than the temperature that can be raised by the heat pump unit, and the difference between these temperatures is greater than a preset temperature difference. The hot water supply device according to claim 5, wherein the hot water storage device is switched to hot water storage and heating operation when it becomes wide.

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