JP5248437B2 - Hot water storage heater - Google Patents

Description

  The present invention relates to a hot water storage type heating apparatus that performs a heating operation using hot water in a hot water storage tank.

  Conventionally, in this type of hot water storage type heating device, hot water in a hot water storage tank is allowed to flow into the evaporator of a heat pump unit having a heat pump circuit in which a compressor, a condenser, a decompression means, and an evaporator are connected in an annular shape by a refrigerant pipe, Some heaters pump up the heat of hot water into the refrigerant and heat the load side such as floor heating using the condenser of the heat pump unit. During the heating operation, the evaporator of the heat pump unit from the hot water storage tank Medium temperature water in the hot water storage tank was used as the warm water supplied to the evaporator, and the temperature of the warm water supplied to the evaporator was controlled to the temperature range of the medium temperature water or lower. (For example, refer to Patent Document 1.)

Japanese Patent Application Laid-Open No. 2004-218921

  By the way, this conventional hot water storage type heating device cannot control the temperature of the hot water flowing from the hot water storage tank to the evaporator of the heat pump unit when the hot water tank is full of hot water. When heating operation is performed with high-temperature hot water flowing in directly, the evaporator side of the heat pump unit is overloaded, and the discharge temperature of the refrigerant discharged from the compressor becomes high, so the compressor is stopped to protect the compressor Control works and the heat pump unit stops. Therefore, the heating operation cannot be continued, and there is a problem that an efficient heating operation using the heat pump unit cannot be performed.

  In addition, when the hot water storage tank is filled with high-temperature hot water, a method of adjusting the amount of inflow into the evaporator is conceivable, for example, the hot water in the hot water storage tank is intermittently flowed into the evaporator. Even if this method is used, high temperature hot water still flows in, and when the high temperature hot water flows into the evaporator, it becomes overloaded at the beginning, and the heat pump unit is stopped and heating operation is performed as described above. In some cases, it may not be possible to continue, and there is a problem that efficient heating operation using the heat pump unit cannot be performed.

  In order to solve the above-described problems, the present invention is particularly configured as claimed in claim 1. A hot water storage tank for storing hot water, and a heat pump circuit in which a compressor, a condenser, a decompression means, and an evaporator are connected in an annular shape by a refrigerant pipe. And a heat pump unit as a heating heat source for heating the load side using the condenser, a heating circulation circuit for circulating hot water from the hot water storage tank to the heating heat exchanger and returning the hot water to the hot water storage tank, and the heating circulation A heating circulation pump that circulates hot and cold water in the circuit, a temperature adjustment circulation circuit that connects the heating heat exchanger and the evaporator in an annular shape, and a temperature adjustment circulation pump that circulates a heat medium in the temperature adjustment circulation circuit. The heating circulation pump, the temperature control circulation pump and the heat pump unit are operated, and the hot heat exchanger exchanges heat between the hot water from the hot water storage tank and the heat medium of the temperature control circuit. The heating medium of the temperature control circuit is heated, heat is exchanged between the heat medium of the temperature control circuit and the refrigerant of the heat pump circuit by the evaporator, heat is absorbed by the refrigerant side of the heat pump circuit, and the heating is performed. It was supposed to be.

  According to a second aspect of the present invention, during the heating, the number of rotations of the heating circulation pump and the temperature control circulation pump is controlled to adjust the amount of heat exchange in the heating heat exchanger, and the temperature from the heating heat exchanger is increased. The temperature of the heat medium flowing into the evaporator via the adjusting circuit is controlled to be a predetermined temperature.

  According to the present invention, during heating, regardless of the temperature of the hot water supplied from the hot water storage tank to the heating heat exchanger, the number of rotations of the heating circulation pump and the temperature control circulation pump is controlled to exchange heat in the heating heat exchanger. Adjust the amount and control the temperature of the heat medium flowing from the heating heat exchanger to the evaporator via the temperature control circuit so that it reaches a predetermined temperature, and then supply a heat medium with a stable temperature to the evaporator of the heat pump unit. Since it is made to flow in, efficient heating operation using a heat pump unit can be performed, and sufficient heating output can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the hot water storage type heating apparatus of one Embodiment of this invention. The schematic block diagram of the hot water storage-type heating apparatus of other embodiment of this invention.

Next, a hot water storage heater according to an embodiment of the present invention will be described with reference to FIG.
1 is a hot water storage tank unit having a hot water storage tank 2 for storing hot water, 3 is a first heat pump unit as a heating means for heating the hot water in the hot water storage tank 2, and 4 is a floor heating panel for heating and heating the air-conditioned space. It is a 2nd heat pump unit as a heating heat source of the load terminal.

  Reference numeral 6 denotes a heat pump circulation circuit that connects the hot water storage tank 2 and the first heat pump unit 3 so as to circulate, and includes a heat pump forward pipe 7 connected to the lower part of the hot water storage tank 2 and a heat pump return pipe 8 connected to the upper part of the hot water storage tank 2. Then, the hot water in the hot water storage tank 2 taken out from the heat pump forward pipe 7 is boiled by the heat pump unit 3 and returned from the heat pump return pipe 8 to the hot water storage tank 2 to store hot hot water. The hot water storage tank 2 has a plurality of hot water storage temperature sensors 9 as hot water storage temperature detection means in the vertical direction, and the amount of heat in the hot water storage tank 2 is determined by the temperature information detected by the hot water storage temperature sensor 9. This is to detect whether or not.

  A hot water supply pipe 10 is connected to the upper end of the hot water storage tank 2 to discharge hot water in the hot water storage tank 2, 11 is a water supply pipe connected to the lower end of the hot water storage tank 2 to supply water into the hot water storage tank 2, and 12 is hot water and water supply from the hot water storage pipe 10. A mixing valve that mixes water from the pipe 11 so as to reach a predetermined set temperature, 13 is a hot water supply pipe that supplies hot water having a set temperature mixed by the mixing valve 12, and 14 is connected to an end of the hot water supply pipe 13. It is a faucet provided in a kitchen or washroom. 15 is a hot water supply temperature sensor provided downstream of the mixing valve 12, and 16 is a hot water supply flow rate sensor for counting the amount of hot water supply.

  The first heat pump unit 3 includes a first compressor 17 having a variable number of revolutions for compressing a refrigerant, a water refrigerant heat exchanger 18 as a first condenser, a first expansion valve 19 as a first pressure reducing means, A first heat pump circuit 21 configured with an air heat exchanger 20 as a forced air-cooled first evaporator and hot water in the hot water storage tank 2 provided in the heat pump forward pipe 7 is circulated to the water refrigerant heat exchanger 18. The heat pump circulating pump 22 to be operated and a first heat pump control unit 23 for controlling the driving of the pump are provided. As the refrigerant of the first heat pump unit 3, any refrigerant such as carbon dioxide refrigerant or HFC refrigerant can be used. In order to consume, it is preferable to use a carbon dioxide refrigerant capable of efficiently boiling hot water in the hot water storage tank 2 at a high temperature as the refrigerant of the first heat pump unit 3.

  The second heat pump unit 4 includes a second compressor 24 having a variable rotation speed that compresses the refrigerant, and a second condenser that performs heat exchange between the high-pressure refrigerant from the second compressor 24 and the heat medium on the load terminal 5 side. The low-pressure refrigerant from the second expansion valve 26 is circulated through the load-side heat exchanger 25, the second expansion valve 26 as the second decompression means for depressurizing the refrigerant flowing out of the load-side heat exchanger 25, and the low-pressure refrigerant. The second heat pump circuit 28 configured with a heat source side heat exchanger 27 as a second evaporator that performs heat exchange between the refrigerant and the heat medium on the heat source side, and the heat medium radiated by the load terminal 5 is used as the load side heat. A load-side circulation pump 29 that circulates in the exchanger 25 and a second heat pump control unit 30 that controls driving thereof are provided. In addition, as a refrigerant | coolant of the 2nd heat pump unit 4, arbitrary refrigerant | coolants, such as a carbon dioxide refrigerant | coolant and a HFC refrigerant | coolant, can be used, but here, the temperature range (for example, 30) used by heating using the load terminal 5 grade | etc., Is used. It is preferable to use an HFC refrigerant such as R410A that can efficiently heat the heating medium on the load terminal 5 side in the temperature range as the refrigerant of the second heat pump unit 4 in consideration of the temperature of 60 ° C. to 60 ° C.

  Reference numeral 31 denotes a load-side circulation circuit in which the load terminal 5 and the load-side heat exchanger 25 are connected in an annular manner and a heat medium such as antifreeze liquid is circulated by the load-side circulation pump 29, and 32 is an upstream of the load terminal 5 of the load-side circulation circuit 31. A forward header provided on the side for branching the heat medium to the plurality of load terminals 5, and a return header 33 provided on the downstream side of the load terminal 5 of the load side circulation circuit 31. Although the forward header 32 and the return header 33 can connect the three load terminals 5, only the one load terminal 5 is shown here, and the remaining two load terminals 5 are omitted. .

  A heating circulation circuit 34 circulates hot water from the upper part of the hot water storage tank 2 to the heating heat exchanger 35 and returns it to the lower part of the hot water storage tank 2, 36 a heating circulation pump that circulates the hot water from the hot water storage tank 2 in the heating circulation circuit 34, 37 A temperature control circuit 38 in which the heat source side heat exchanger 27 and the heating heat exchanger 35 of the second heat pump unit 4 are connected in an annular shape, and 38 is a temperature control circuit that is provided in the temperature control circuit 37 and circulates a heat medium such as antifreeze liquid. A circulation pump 39 is a temperature sensor provided in the temperature control circuit 37 as temperature detection means for detecting the temperature of the heat medium flowing from the heating heat exchanger 35 into the heat source side heat exchanger 27.

  Reference numeral 40 denotes a first heat pump control unit 23, a second heat pump control unit 30, and a remote controller (not shown) for instructing start / stop of the heating operation by the load terminal 5 and communicates with each other by wireless or wired connection, and a hot water storage tank unit It is a control part which has the microcomputer which receives the input of each sensor in 1, and controls the drive of each actuator, and controls hot water supply and heating.

Here, a hot water storage operation in which hot water in the hot water storage tank 2 is heated by the first heat pump unit 3 to store hot hot water in the hot water storage tank 2 will be described.
When the control unit 40 detects that the necessary amount of heat does not remain in the hot water storage tank 2 in the hot water storage tank 2 by the temperature detected by the hot water storage temperature sensor 9 during the midnight power hours when the power unit price is low, the control unit 40 controls the first heat pump control unit 23. Issue a hot water storage operation start command. Upon receiving the command, the first heat pump control unit 23 starts the first compressor 17 and starts driving the heat pump circulation pump 22, and removes the low-temperature water taken out from the heat pump forward pipe 7 connected to the lower part of the hot water storage tank 2. It is circulated through the water / refrigerant heat exchanger 18 and heated to a high temperature, returned to the hot water storage tank 2 from the heat pump return pipe 8 connected to the upper part of the hot water storage tank 2, and sequentially stacked from the upper part of the hot water storage tank 2 to store hot hot water. I will do it. When the controller 40 detects that a necessary amount of heat has been stored by the temperature detected by the hot water storage temperature sensor 9, the controller 40 issues a hot water storage stop command to the first heat pump controller 23, and the first heat pump controller 23 The compressor 17 is stopped and the heat pump circulation pump 22 is also stopped to end the hot water storage operation.

Next, the heating operation will be described.
When the load terminal 5 instructs the heating of the air-conditioned space by the remote controller, the control unit 40 starts driving the heating circulation pump 36 and the temperature control circulation pump 38 and causes the second heat pump control unit 30 to start operation. Instructed, the second heat pump control unit 30 starts driving the load-side circulation pump 29 after starting the second compressor 24, operates the second heat pump unit 4, and starts the heating operation.

  When the heating operation is started, the heating heat exchanger 35 exchanges heat between the hot water from the upper part of the hot water storage tank 2 and the heat medium in the temperature control circuit 37 to heat the heat medium in the temperature control circuit 37. The heated heating medium of the temperature control circuit 37 flows into the heat source side heat exchanger 27 that is the evaporator of the second heat pump unit 4.

  Then, in the heat source side heat exchanger 27, the heat medium of the temperature control circuit 37 and the low-temperature and low-pressure refrigerant discharged from the second expansion valve 26 of the second heat pump circuit 28 are heat-exchanged, and the temperature control circuit 37 The heat of the heat medium is pumped to the refrigerant side of the second heat pump unit 4 and absorbed, and the high-pressure refrigerant and the load terminal from the second compressor 24 are received by the load-side heat exchanger 25 that is a condenser of the second heat pump unit 4. The heat medium in the load-side circulation circuit 31 that exchanges heat with the heat medium on the 5th side and is heated by the load-side heat exchanger 25 is circulated to the load terminal 5 by the operation of the load-side circulation pump 29, and the load-side circulation pump 29 is controlled to adjust the circulation flow rate of the heat medium in the load-side circulation circuit 31 so that the air-conditioned space instructed by the remote controller is heated and heated so as to reach a set temperature.

  In this heating operation, the temperature of the heat medium in the temperature control circuit 37 that flows from the heating heat exchanger 35 to the heat source side heat exchanger 27 is controlled to be a predetermined temperature. Therefore, the control unit 40 controls the number of rotations of the heating circulation pump 36 and the temperature control circulation pump 38, and determines the circulation flow rate of the hot water circulating in the heating circulation circuit 34 and the circulation flow rate of the heat medium circulating in the temperature adjustment circulation circuit 37. The amount of heat exchange in the heating heat exchanger 35 is adjusted and the temperature of the heat medium detected by the temperature sensor 39 is set to a predetermined temperature. The unit 40 controls the number of revolutions of the temperature control circulation pump 38 at a predetermined constant number of rotations, makes the circulation flow rate of the heat medium circulating in the temperature control circuit 37 constant, and detects the temperature control circuit 37 detected by the temperature sensor 39. The amount of heat exchange in the heating heat exchanger 35 is changed by variably controlling the number of rotations of the heating circulation pump 36 so that the temperature of the heating medium becomes a predetermined temperature and varying the circulation flow rate of the hot water circulating in the heating circulation circuit 34. It is what is being adjusted. Further, the temperature of the heating medium in the temperature control circuit 37 detected by the temperature sensor 39 is controlled by controlling the number of revolutions of the heating circulation pump 36 at a predetermined constant number of revolutions, making the circulation flow rate of the warm water circulating in the heating circuit 34 constant. The temperature of the temperature adjustment circulation pump 38 is variably controlled so that the circulation rate of the hot water circulating in the temperature adjustment circulation circuit 37 is varied so that the amount of heat exchange in the heating heat exchanger 35 is adjusted. It may be.

  Here, as a method for setting the predetermined temperature, a temperature at which the second heat pump unit 4 operates efficiently is selected based on data collected from tests or the like previously performed using the second heat pump unit 4, and the temperature Is set in the control unit 40 in advance as a predetermined temperature.

  As described above, during the heating operation, regardless of whether the hot water is supplied from the hot water storage tank 2 to the heating heat exchanger 35 or the medium temperature hot water is supplied, the heating heat exchanger 35 is heated regardless of the temperature of the supplied hot water. The number of rotations of the circulation pump 36 and the temperature control circulation pump 38 is controlled to control the circulation flow rate of the hot water circulating in the heating circulation circuit 34 and the circulation flow rate of the heat medium circulating in the temperature adjustment circulation circuit 37, thereby heating heat. The amount of heat exchange in the exchanger 35 is adjusted, and the temperature of the heat medium that flows from the heating heat exchanger 35 to the heat source side heat exchanger 27 that is the evaporator of the second heat pump unit 4 via the temperature control circuit 37 is set to a predetermined value. Since the heat medium having a stable temperature is caused to flow into the heat source side heat exchanger 27 by controlling the temperature to become the temperature, an efficient heating operation using the heat pump unit can be performed and sufficient heating output is obtained. Can be That.

  The present invention is not limited to the above-described embodiment. In this embodiment, the hot water taken out from the upper part of the hot water storage tank 2 is circulated to the heating heat exchanger 35. It is good also as a structure which circulates the hot water taken out from the part or the low-temperature water taken out from the lower part of the hot water storage tank 2 to the heating heat exchanger 35, and the hot water taken out from the upper part of the hot water storage tank 2 to the heating heat exchanger 35 The hot water passed through the heating heat exchanger 35 is returned to the lower part of the hot water storage tank 2, but the hot water passed through the heating heat exchanger 35 may be returned to the intermediate part of the hot water storage tank 2. The temperature of the hot water after passing through the heating heat exchanger 35 is detected, and the hot water after passing through the heating heat exchanger 35 is returned to the intermediate part of the hot water tank 2 or returned to the lower part of the hot water tank 2 in accordance with the detected temperature. Those may be as able to select configure.

  Moreover, in this embodiment, although the heating medium circulation type load terminal 5 such as a floor heating panel is used for the heating operation for heating the air-conditioned space, the condenser of the second heat pump unit 4 is used for the heating operation. The load-side heat exchanger 25 may be used to heat the air-conditioned space by directly exchanging heat with the air in the air-conditioned space, like an indoor unit of an air conditioner.

  In the present embodiment, the heating means for heating the hot water in the hot water storage tank 2 is not limited to the heat pump type as in the first heat pump unit 3, and may be constituted by an electric heater. It is.

Next, a hot water storage type heating apparatus according to another embodiment of the present invention will be described with reference to FIG. 2. Only different configurations and operations will be described.
A branch pipe 41 branches from the heat-pump return pipe 8 and is connected to the heating heat exchanger 35. The branch pipe 41 can flow hot water heated by the first heat pump unit 3 directly into the heating heat exchanger 35. A distribution valve 42 for adjusting a distribution ratio between the amount of hot water circulated in the hot water storage tank 2 and the amount of hot water circulated in the heating heat exchanger 35 is provided at a branch point between the pipe 41 and the heat-pump return pipe 8. . The distribution valve 42 communicates the branch pipe 41 with the heat pump return pipe 8 connected to the upper part of the hot water storage tank 2 on the downstream side of the distribution valve 42 during the heating operation using the hot water in the hot water storage tank 2. It is assumed that the hot water taken out from the upper part of the hot water storage tank 2 is circulated in the order of the heat pump return pipe 8, the branch pipe 41, and the heating heat exchanger 35, and can be adjusted to constitute a heating circulation circuit 34 that returns the hot water to the hot water storage tank 2.

Next, although heating operation is demonstrated, description is abbreviate | omitted about operation | movement of the 2nd heat pump unit 4 including operation | movement of the load side circulation pump 29 which operate | moves similarly to one Embodiment demonstrated previously.
When the load terminal 5 instructs the heating of the air-conditioned space by the remote controller, the control unit 40 connects the distribution valve 42 to the upper part of the hot water storage tank 2 on the downstream side of the distribution valve 42 and the branch pipe 41. And the heating circulation pump 36 and the temperature control circulation pump 38 are started to be driven, and the second heat pump control unit 30 is instructed to start the operation. The second heat pump control unit 30 is a second heat pump unit. 4 is started, and the heating operation is started, and the temperature of the heat medium of the temperature control circuit 37 that flows from the heating heat exchanger 35 to the heat source side heat exchanger 27 is set to a predetermined value in the same manner as in the embodiment described above. The temperature is controlled to be the same.

  Further, when the load terminal 5 instructs the heating of the air-conditioned space by the remote controller or during the heating operation, the control unit 40 has a predetermined amount of hot water that can be used for the heating operation based on the temperature detected by the hot water storage temperature sensor 9. When it is determined that the temperature of the hot water flowing into the heating heat exchanger 35 has become equal to or lower than the predetermined temperature, the control unit 40 stops the heating circulation pump 36 and heats the hot water from the first heat pump unit 3. The distribution ratio of the distribution valve 42 is adjusted so as to circulate only to the heat exchanger 35 side, the first heat pump control unit 23 is instructed to start operation, and the first heat pump control unit 23 activates the first compressor 17. After that, the driving of the heat pump circulation pump 22 is started, the first heat pump unit 3 is operated, and the low-temperature water taken out from the lower part of the hot water storage tank 2 is supplied to the first heat pump unit. And heated at Tsu preparative 3, the heated and circulated to the directly heated heat exchanger 35 hot water, heating operation directly (hereinafter, referred to as direct warm) and performs.

  In addition, also when performing the said direct warming, the temperature of the heat medium of the temperature control circuit 37 which flows in into the heat-source side heat exchanger 27 from the heating heat exchanger 35 is controlled so that it may become predetermined temperature. Therefore, the control unit 40 controls the rotation speed of the temperature control circulation pump 38, the first heat pump control unit 23 controls the heat pump circulation pump 22, and the circulation flow rate of the heat medium circulating in the temperature control circuit 37 and the first heat pump. The flow rate of hot water circulated directly from the unit 3 to the heating heat exchanger 35 is controlled, the amount of heat exchange in the heating heat exchanger 35 is adjusted, and the temperature of the heat medium detected by the temperature sensor 39 is predetermined. The first heat pump control unit 23 controls the rotation speed of the heat pump circulation pump 22 at a predetermined fixed rotation speed and directly from the first heat pump unit 3. The circulating flow rate of the hot water circulated through the heating heat exchanger 35 is constant, and the control unit 40 performs temperature control circulation so that the temperature of the heat medium in the temperature control circuit 37 detected by the temperature sensor 39 becomes a predetermined temperature. Po The rotational speed of the flops 38 variably controlled to the circulation flow rate of the heat medium circulating through the temperature control circulation circuit 37 is varied, but that adjusts the amount of heat exchange in the heating heat exchanger 35.

  Further, during the heating operation or during the direct warming, the control unit 40 determines that the remaining hot water amount in the hot water storage tank 2 is small based on the temperature detected by the hot water storage temperature sensor 9, and requests for the hot water storage operation and the direct warming request. Are generated simultaneously, the control unit 40 adjusts the distribution ratio of the distribution valve 42 so that the hot water from the first heat pump unit 3 circulates to both the hot water storage tank 2 side and the heating heat exchanger 35 side. For example, when the distribution ratio is 50:50, hot water storage operation can be performed at the same time as performing direct warming, and at that time, optimal distribution according to the situation at that time is possible.

  Even when the direct heating and the hot water storage operation are performed simultaneously, the temperature of the heat medium in the temperature control circuit 37 that flows from the heating heat exchanger 35 to the heat source side heat exchanger 27 is controlled to be a predetermined temperature. ing. Therefore, the control unit 40 controls the rotation speed of the temperature control circulation pump 38, the first heat pump control unit 23 controls the heat pump circulation pump 22, and the circulation flow rate of the heat medium circulating in the temperature control circuit 37 and the first heat pump. The flow rate of hot water circulated directly from the unit 3 to the heating heat exchanger 35 is controlled, the amount of heat exchange in the heating heat exchanger 35 is adjusted, and the temperature of the heat medium detected by the temperature sensor 39 is predetermined. The control unit 40 circulates through the temperature control circuit 37 by controlling the rotation speed of the temperature adjustment circulation pump 38 at a predetermined fixed rotation speed. The first heat pump control unit 23 controls the rotational speed of the heat pump circulation pump 22 at a predetermined constant rotational speed and adjusts the distribution ratio of the distribution valve 42 so that the circulation rate of the heat medium is constant. From The flow rate of the hot water to be circulated to the heating heat exchanger 35 side is controlled, the amount of heat exchange in the heating heat exchanger 35 is adjusted, and the heat medium of the temperature control circuit 37 detected by the temperature sensor 39 is adjusted. The temperature is controlled to be a predetermined temperature.

  As described above, during the heating operation, regardless of whether the hot water is supplied from the hot water storage tank 2 to the heating heat exchanger 35 or the medium temperature hot water is supplied, the heating heat exchanger 35 is heated regardless of the temperature of the supplied hot water. The number of rotations of the circulation pump 36 and the temperature control circulation pump 38 is controlled to control the circulation flow rate of the hot water circulating in the heating circulation circuit 34 and the circulation flow rate of the heat medium circulating in the temperature adjustment circulation circuit 37, thereby heating heat. The amount of heat exchange in the exchanger 35 is adjusted, and the temperature of the heat medium that flows from the heating heat exchanger 35 to the heat source side heat exchanger 27 that is the evaporator of the second heat pump unit 4 via the temperature control circuit 37 is set to a predetermined value. Since the heat medium having a stable temperature is caused to flow into the heat source side heat exchanger 27 by controlling the temperature to become the temperature, an efficient heating operation using the heat pump unit can be performed and sufficient heating output is obtained. Can be That.

  Further, during the direct warming, during the simultaneous operation of the direct warming and the hot water storage operation, the first heat pump unit 3 supplies the heating heat exchanger 35 regardless of whether the high temperature hot water is supplied or the medium temperature hot water is supplied. In the case of direct warming regardless of the temperature of the hot water to be heated, the number of rotations of the heat pump circulation pump 22 and the temperature control circulation pump 38 is controlled, and the circulation flow rate of the heat medium circulating in the temperature control circuit 37 and the first heat pump unit 3 to control the circulation rate of hot water to be directly circulated to the heating heat exchanger 35 to adjust the heat exchange amount in the heating heat exchanger 35, and during the simultaneous operation of direct heating and hot water storage operation, The number of rotations of the pump 22 and the temperature control circulation pump 38 is controlled, and the distribution ratio of the distribution valve 42 is adjusted so that the circulation rate of the heat medium circulating in the temperature control circuit 37 and the first heat pump unit 3 directly. Heating heat exchanger 35 The evaporator of the second heat pump unit 4 is controlled from the heating heat exchanger 35 through the temperature control circuit 37 by controlling the circulation flow rate of the hot water to be circulated and adjusting the heat exchange amount in the heating heat exchanger 35. Since the temperature of the heat medium flowing into the heat source side heat exchanger 27 is controlled to be a predetermined temperature and the heat medium having a stable temperature is flowed into the heat source side heat exchanger 27, the efficiency using the heat pump unit Heating operation can be performed and sufficient heating output can be obtained.

  The present invention is not limited to the other embodiments described above. In this embodiment, the hot water taken out from the upper part of the hot water storage tank 2 is circulated to the heating heat exchanger 35. It is good also as a structure which circulates the warm water taken out from the intermediate part, or the low temperature water taken out from the lower part of the hot water storage tank 2 to the heating heat exchanger 35, and the hot water taken out from the hot water storage tank 2 upper part is good also as the heating heat exchanger 35. The hot water that has passed through the heating heat exchanger 35 is returned to the lower part of the hot water storage tank 2, but the hot water that has passed through the heating heat exchanger 35 may be returned to the intermediate part of the hot water storage tank 2, Further, the temperature of the hot water after passing through the heating heat exchanger 35 is detected, and the hot water after passing through the heating heat exchanger 35 is returned to the intermediate part of the hot water tank 2 or returned to the lower part of the hot water tank 2 according to the detected temperature. Or those with modifications include an arrangement can be selected.

  Moreover, in this embodiment, although the heating medium circulation type load terminal 5 such as a floor heating panel is used for the heating operation for heating the air-conditioned space, the condenser of the second heat pump unit 4 is used for the heating operation. The load-side heat exchanger 25 may be used to heat the air-conditioned space by directly exchanging heat with the air in the air-conditioned space, like an indoor unit of an air conditioner.

  In the present embodiment, the heating means for heating the hot water in the hot water storage tank 2 is not limited to the heat pump type as in the first heat pump unit 3, and may be constituted by an electric heater. It is.

2 Hot water storage tank 4 Second heat pump unit 24 Compressor (second compressor)
25 Condenser (load-side heat exchanger)
26 Pressure reducing means (second expansion valve)
27 Evaporator (heat source side heat exchanger)
28 Heat pump circuit (second heat pump circuit)
34 Heating Circulation Circuit 35 Heating Heat Exchanger 36 Heating Circulation Pump 37 Temperature Control Circulation Circuit 38 Temperature Control Circulation Pump

Claims (2)

  A heat pump as a heating heat source having a hot water storage tank for storing hot water, a compressor, a condenser, a decompression means, a heat pump circuit in which an evaporator is connected in an annular shape with a refrigerant pipe, and heating the load side using the condenser A heating circulation circuit for circulating hot water from the hot water storage tank to the heating heat exchanger and returning the hot water to the hot water storage tank; a heating circulation pump for circulating hot water in the heating circulation circuit; the heating heat exchanger and the evaporator And a temperature control circulation pump that circulates a heat medium in the temperature control circuit, and operates the heating circulation pump, the temperature control circulation pump, and the heat pump unit, Heat is exchanged between the hot water from the hot water storage tank and the heat medium in the temperature control circuit with a heating heat exchanger, the heat medium in the temperature control circuit is heated, and the temperature control circuit is heated with the evaporator. A refrigerant medium and the heat pump circuit is the heat exchange, is absorbed by the refrigerant side of said heat pump circuit, the hot water storage type heating apparatus is characterized in that to perform the heating.   During the heating, the number of rotations of the heating circulation pump and the temperature adjustment circulation pump is controlled to adjust the amount of heat exchange in the heating heat exchanger, and the heating heat exchanger passes through the temperature adjustment circulation circuit to adjust the heat exchange amount. The hot water storage type heating apparatus according to claim 1, wherein the temperature of the heat medium flowing into the evaporator is controlled to be a predetermined temperature.

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