JP2008304153A - Heat pump water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multifunctional heat pump water heater for improving a heat loss in bath reheating operation and hot water supply operation, by eliminating a shortage of hot water, while shortening bath reheating time. <P>SOLUTION: This multifunctional heat pump water heater has a first refrigerant circuit, a second refrigerant circuit, a hot water supply water circuit, a bath water circuit and a floor heating water circuit. The refrigerant circuit has a refrigerant switching valve for switching the refrigerant circuit of a hot water supply heat exchanger and a bath heat exchanger, by arranging the refrigerant circuit for making a refrigerant flow in order of the floor heating heat exchanger from the bath heat exchanger in parallel to the hot water supply heat exchanger. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat pump water heater.

  The heat pump water heater stores hot water (about 65 to 85 ° C.) heated by a heat pump cycle as hot water storage in a hot water storage tank having an internal capacity of about 370 to 460 liters, and is set with a remote controller or the like when used. Adjust the temperature by mixing water with hot water so that the temperature reaches the temperature. This is called a hot water storage type heat pump water heater.

  In addition, there are water heaters that make up a hot water storage tank that is composed of two heat pump cycles, operates the heat pump when hot water is used, and directly supplies hot water that matches the temperature set by a remote controller. . This is called a direct heat pump water heater.

  In recent years, with the spread of heat pump water heaters, so-called multi-functional heat pump water heaters having a floor heating function as well as a hot water supply function have been proposed. As for this multifunction heat pump water heater, there are those described in Patent Document 1 and Patent Document 2.

  The multi-functional heat pump water heater of Patent Document 1 is a hot water storage type. The bath reheating operation is performed by circulating hot water in the hot water storage tank as a heating source and exchanging heat between the hot water in the water refrigerant heat exchanger and the hot water in the bath tub. The floor heating operation is independent of the bath reheating operation. The hot water in the expansion tank is circulated by a pump, and the hot water heated by the water refrigerant heat exchanger for floor heating is circulated to the floor heating panel. Done.

  The multifunctional heat pump water heater of Patent Document 2 is a direct type. The hot-water supply operation is a water-refrigerant heat exchanger in which a hot-water supply heat exchanger and a bath-heating heat exchanger are integrated, and the hot-water supply is heated and supplied in accordance with a temperature set by a remote controller or the like. The bath reheating operation is performed by exchanging heat between the high-temperature refrigerant in the hot water supply refrigerant pipe and the cold water of the bath in the water reheating water pipe in the water refrigerant heat exchanger. The floor heating function is performed by exchanging heat between the high-temperature refrigerant in the refrigerant pipe and the circulating water in the hot water pipe for floor heating by an independent floor-heating water refrigerant heat exchanger.

JP-A-2005-274021 JP 2004-278876 A

  However, in the configuration described in Patent Document 1, in order to use late-night power, which is a cheaper charge, heat pump operation is performed for a long period of midnight, and hot water is stored in a hot water storage tank. That is, since a hot water storage tank having a large capacity is required, the heat pump unit and the tank unit are provided separately. That is, it is necessary to increase the installation strength by increasing the installation area. In addition, since hot water (65 to 85 ° C.) in the hot water storage tank is circulated and used as a heating source for bath reheating, the bath replenishing time is prolonged when the hot water storage temperature is low (65 ° C.). Furthermore, there is a possibility that the water temperature in the hot water storage tank is lowered and hot water runs out.

  In addition, the direct heat pump water heater described in Patent Document 2 has two heat pump cycles, and heat pump operation is performed during each operation of hot water supply, bath reheating, and floor heating, so the bath renewal time is shortened. Yes, it can solve the tank hot water shortage.

  However, since the hot water supply heat exchanger that is frequently used is integrated with the bath heat exchanger, the bath heat exchanger is also heated each time hot water is used. Thereby, there exists a possibility that a heat loss may become large.

  In addition, when performing bath reheating and floor heating at the same time, two cycles of simultaneous operation must be continued even after the floor heating operation is stabilized. Therefore, there is a possibility that the operation efficiency in the simultaneous operation of bathing and floor heating may be reduced.

  The present invention solves the above-described conventional problems. An object of the present invention is to provide a multifunctional heat pump water heater that is small and light and that has improved operating efficiency by reducing heat loss.

  In order to solve the above-described problem, a heat pump water heater according to a first aspect of the present invention is a heat pump water heater having a compressor and an evaporator. A first refrigerant circuit having the compressor, the first heat exchanger, and the evaporator, the compressor and the evaporator are connected, and in parallel with the first heat exchanger A second refrigerant circuit having a second heat exchanger to be connected; a hot water supply circuit connected to the first heat exchanger; and a bath reheating water circuit connected to the second heat exchanger Or a floor heating heat medium circuit.

  Moreover, in the heat pump water heater having a compressor and an evaporator, heat exchange is performed between the first heat exchanger that exchanges heat between the water supplied from the water supply unit and the refrigerant, and the water that is sent from the bath tub and the refrigerant. A second heat exchanger, a third heat exchanger for exchanging heat between the heat medium sent from the floor heating panel and the refrigerant, the compressor, the first heat exchanger, and the evaporator. A first refrigerant circuit, a second heat exchanger connected to the compressor and the evaporator, and connected in parallel with the first heat exchanger; and a third heat exchanger. A second refrigerant circuit, a hot water circuit connected to the first heat exchanger, a bath water supply circuit connected to the second heat exchanger, and a third heat exchanger. And a floor heating heat medium circuit.

  Further, in a heat pump water heater having a compressor and an evaporator, a first heat exchanger that exchanges heat between water supplied from a water supply terminal and refrigerant and heat exchange between water and refrigerant sent from a bath tub are exchanged. A second heat exchanger, a third heat exchanger for exchanging heat between the heat medium sent from the floor heating panel and the refrigerant, the compressor, the first refrigerant distribution valve, the first heat exchanger, and the first heat exchanger. A first refrigerant circuit in which one expansion valve and the evaporator are sequentially connected, the compressor, the second refrigerant distribution valve, the second heat exchanger, the third heat exchanger, and a second A second refrigerant circuit in which the expansion valve and the evaporator are connected in order, a hot water supply circuit having the first circulation pump connected to the first heat exchanger, and the second heat exchanger are connected. A bath replenishing water circuit having a second circulation pump and the third heat exchanger are connected to connect a third circulation pump. Characterized by comprising a floor heating heat carrier circuit having a flop, a.

  Also, a first refrigerant circuit having a compressor, an evaporator, and a first heat exchanger, the compressor and the evaporator are connected, and are connected in parallel with the first heat exchanger. A second refrigerant circuit having a second heat exchanger, a hot water circuit to which the first heat exchanger is connected, and a bath to which a heat exchanger in an upstream portion of the second heat exchanger is connected A reheating water circuit and a floor heating heat medium circuit to which a heat exchanger in a downstream portion of the second heat exchanger is connected are provided.

  In any one of the above heat pump water heaters, a tank hot water supply circuit having a hot water storage tank and a hot water supply mixing valve and connected in parallel with the hot water supply water circuit is provided.

  In any of the above heat pump water heaters, the heat pump water heater has a valve that distributes the refrigerant to a branch portion between the first refrigerant circuit and the second refrigerant circuit.

  In any one of the above heat pump water heaters, the hot water supply circuit heat-exchanges the supplied water with a first heat exchanger and directly supplies hot water from a hot water supply terminal.

  ADVANTAGE OF THE INVENTION According to this invention, it can provide the multifunction type heat pump water heater which was small and lightweight, and reduced the heat loss and improved the operation efficiency.

  Embodiments of the present invention will be described below with reference to FIGS.

  FIG. 1 is an overall system diagram of the multifunction heat pump water heater of the present invention. FIG. 2 is a flowchart showing an embodiment of a hot water supply operation in the multifunction heat pump water heater of the present invention. FIG. 3 is a flowchart showing an embodiment of the floor heating operation in the multifunction heat pump water heater of the present invention. FIG. 4 is a flowchart showing an embodiment of the hot water bathing operation and the bath reheating operation in the multifunction heat pump water heater of the present invention. FIG. 5 is a flowchart showing an embodiment of the floor heating operation and the bath reheating operation in the multifunction heat pump water heater of the present invention.

  (Overall Configuration) First, the configuration of the multifunction heat pump water heater of the present invention will be described with reference to FIG.

  The multi-function heat pump water heater is roughly divided into a heat pump refrigerant circuit 40, a water circuit 45, and an operation control means 50. Furthermore, the heat pump refrigerant circuit 40 has two cycles of a first system refrigerant circuit 41 and a second system refrigerant circuit 42.

  Each component in the heat pump refrigerant circuit 40 and the water circuit 45 is integrally stored in the same box. The water circuit 45 includes a hot water supply water circuit 46, a bath water filling water circuit 47, a bath replenishing water circuit 48, and a floor heating water circuit 49.

  The water supply source 10 of the water circuit 45, the hot water supply terminal 18 such as a kitchen faucet, the bath tub 24, and the floor heating panel 28 are configured separately from the multifunction heat pump water heater. That is, in an actual use environment, the water supply fitting 11 (water supply section), the hot water supply outlet fitting 17, the bath fitting 25, the bath return fitting 27, the floor heating fitting 29, and the floor heating return fitting 32 are respectively connected and used. It is a configuration.

  The 1st system refrigerant circuit 41 works as a heating source at the time of what is called general hot water supply or bath hot water operation, such as kitchen hot water supply, washroom hot water supply, and a shower. On the other hand, the second system refrigerant circuit 42 functions as a heating source during the bath reheating operation and the floor heating operation.

  The first system refrigerant circuit 41 includes a refrigerant, a first system refrigerant distribution valve 2, a hot water supply heat exchanger 4, a refrigerant side heat transfer pipe 4 a, a first system expansion valve 5, and an evaporator 6. It is composed of a closed refrigerant cycle for hot water supply that is sequentially connected by refrigerant piping. And the inside of the 1st system refrigerant circuit 41 is enclosed so that a refrigerant may flow.

  The second system refrigerant circuit 42 is arranged in the compressor 1, the second system refrigerant distribution valve 3, the refrigerant side bath heat transfer tube 7a arranged in the bath heat exchanger 7, and the floor heating heat exchanger 8. The refrigerant side floor heating heat transfer pipe 8a, the second system expansion valve 9, and the evaporator 6 are each composed of a floor heating hermetic refrigerant cycle in which refrigerant pipes are sequentially connected. And the inside of the 2nd system refrigerant circuit 42 is enclosed so that a refrigerant may flow.

  Here, the compressor 1 and the evaporator 6 are used as common parts for the first system refrigerant circuit 41 and the second system refrigerant circuit 42. Switching between the first system refrigerant circuit (sealed refrigerant cycle for hot water supply) and the second system refrigerant circuit (sealed refrigerant cycle for floor heating) is performed by opening and closing the first system refrigerant distribution valve 2 and the second system refrigerant distribution valve 3. This is performed by adjusting the opening amount of the first system expansion valve 5 and the second system expansion valve 9. The components of the first system refrigerant circuit 41 (the heat exchanger for bath 7, the heat exchanger 8 for floor heating, and the second system expansion valve 9) and the components of the second system refrigerant circuit 42 (heat for hot water supply) The exchanger 4 and the first system expansion valve 5) are provided in parallel.

  That is, the first system refrigerant circuit 41 and the second system refrigerant circuit 42 can be operated independently. As an example, the heat exchanger 4 for hot water supply is used at the time of hot water supply operation, and is not used at the time of bathing and floor heating operation. Thereby, the excessive heat loss from the heat exchanger 4 for hot water supply can be reduced, and the operation efficiency in the general hot water supply and bath hot water supply with high use frequency can be aimed at.

  The compressor 1 has a capacity suitable for a so-called direct hot water heat pump water heater that directly supplies hot water heated by the hot water supply heat exchanger 4. Moreover, it is a rotational speed control type compressor which can change rotation speed according to the amount of hot water supplies. That is, the compressor 1 is configured to be able to control the rotational speed from a low speed (eg, 700 rpm) to a high speed (eg, 7000 rpm) by PWM control, voltage control (eg, PAM control), or a combination control thereof. The

  In this structure, it is the structure which has the compressor 1 independently, However, Not only this but the structure which has two or more compressors may be sufficient. As a result, more efficient heat exchange can be performed during simultaneous operation of hot water supply, bath reheating, and floor heating.

  The hot water supply heat exchanger 4 includes a refrigerant side heat transfer tube 4a and a water supply side heat transfer tube 4b, and is configured to exchange heat between the refrigerant side heat transfer tube 4a and the water supply side heat transfer tube 4b.

  Similarly, the bath heat exchanger 7 includes a refrigerant side bath heat transfer tube 7a and a water side bath heat transfer tube 7b, so that heat is exchanged between the refrigerant side bath heat transfer tube 7a and the water side bath heat transfer tube 7b. Configured.

  Similarly, the floor heating heat exchanger 8 includes a refrigerant side floor heating heat transfer pipe 8a and a heat medium side floor heating heat transfer pipe 8b, and includes a refrigerant side floor heating heat transfer pipe 8a and a heat medium side floor heating heat transfer pipe 8b. It is configured to exchange heat between them.

  The high-pressure refrigerant sent through the hot water supply heat exchanger 4 and the floor heating heat exchanger 8 is depressurized by the first system expansion valve 5 and the second system expansion valve 9 to the evaporator 6 as a low-pressure refrigerant that easily evaporates. Sent. In the case of a multifunction heat pump water heater, the first system expansion valve 5 and the second system expansion valve 9 adjust the refrigerant circulation amount in the heat pump circuit by changing the opening of the refrigerant flow path. Further, by fully opening the throttle amount, a large amount of refrigerant is sent to the evaporator 6 to melt frost (defrosting operation is performed). Therefore, it is preferable that the first system expansion valve 5 and the second system expansion valve 9 are electric expansion valves having a variable throttle amount and good response.

  Moreover, the evaporator 6 is comprised with the air refrigerant | coolant heat exchanger which takes in external air by rotation of a fan (not shown), and performs heat exchange with air and a refrigerant | coolant.

  (Hot water supply operation) Next, the heat pump operation when hot water is used will be described.

  The hot water supply circuit includes a general hot water supply circuit from a kitchen faucet and a bathroom faucet, and a bath hot water supply circuit such as a bath hot water bath and a shower.

  The hot water supply circuit includes a direct hot water supply circuit and a tank hot water supply circuit. The direct hot water supply circuit operates a heat pump to directly supply hot water heated by the hot water supply heat exchanger 4 according to a required temperature. The tank hot water supply circuit supplies hot water at an appropriate temperature by mixing low temperature water from the water supply source 10 with high temperature water in the hot water storage tank 19 stored in advance.

  The refrigerant in the hot water supply operation flows through the first system refrigerant circuit. The path is in the order of the compressor 1 → the first system refrigerant distribution valve 2 → the refrigerant side heat transfer pipe 4 a of the hot water supply heat exchanger 4 → the first system expansion valve 5 → the evaporator 6 → the compressor 1. That is, the refrigerant changes the state of low-pressure steam → high-pressure steam → high-pressure liquid → low-pressure liquid → low-pressure steam, and heats hot water by carrying heat.

  Specifically, the refrigerant converted into the high-temperature and high-pressure gas by the compressor 1 heats the feed water flowing through the feed water side heat transfer tube 4b in the refrigerant side heat transfer tube 4a. Then, the refrigerant that has been decompressed by the first system expansion valve 5 and has become low-temperature and low-pressure gas by the evaporator 6 returns to the compressor 1. By repeating this refrigerant circulation, hot water can be continuously heated to supply hot water.

  In this hot water supply operation, the compressor 1 is operated by performing rotational speed control in accordance with a hot water supply load such as a water supply temperature or a hot water supply temperature.

  Hot water in the hot water supply operation flows through the hot water supply water circuit 46. In the case of general hot water supply from the use terminal 18 (kitchen faucet, etc.), the water supply source 10 (water supply etc.) → water supply fitting 11 → pressure reducing valve 12 → tank circulation pump 13 → water supply side of the hot water supply heat exchanger 4 The heat transfer pipe 4b, the hot water mixing valve 14, the hot water mixing valve 15, the flow rate adjusting valve 16, the hot water outlet fitting 17, and the hot water terminal 18 are arranged in this order.

  (Tank Hot Water Supply Operation) Next, the tank hot water supply operation will be described.

  Immediately after the start of the heat pump operation, there is a shortage of heating in the hot water supply heat exchanger 4, and there is a risk that hot water cannot be supplied immediately at the temperature set by a remote controller or the like. Therefore, the hot water supply mixing valve 14 performs a tank hot water supply operation in which the shortage of heating in the hot water supply heat exchanger 4 immediately after the start of the heat pump operation is compensated with the hot water stored in the hot water storage tank 19.

  When the hot water mixed by the hot water supply mixing valve 14 is higher than the temperature set by a remote controller or the like, the hot water mixing valve 15 mixes the water from the water supply fitting 11 to an appropriate temperature.

  The flow rate adjustment valve 16 adjusts the flow rate in order to maintain the hot water supply heating temperature based on the terminal usage status and the hot water supply temperature command from the operation control means 50.

  The water supply path of the tank hot water supply operation is as follows: water supply source 10 → water supply fitting 11 → pressure reducing valve 12 → hot water storage tank 19 → hot water mixing valve 14 → hot water mixing valve 15 → flow rate adjusting valve 16 → hot water outlet fitting 17 → hot water supply terminal 18. It is.

  Here, hot water is supplied to the hot water storage tank 19 from the lower part, and hot water is supplied from the upper part of the hot water storage tank 19 by hot water supply corresponding to the amount of water supplied.

  (Tank Hot Water Operation) Next, the tank hot water operation will be described.

  When the amount of water supplied into the hot water storage tank 19 by the tank hot water supply operation increases and the high-temperature water falls below a predetermined amount, the operation control means automatically starts the tank hot water storage operation.

  The water supply path in the tank hot water storage operation is in the order of the hot water storage tank 19 → the tank circulation pump 13 → the water supply side heat transfer pipe 4 b of the hot water supply heat exchanger 4 → the hot water supply mixing valve 14 → the hot water storage tank 19.

  Here, the hot water stored in the first system heat pump refrigerant circuit and sent from the hot water storage tank 19 to the hot water supply heat exchanger 4 was heated between the refrigerant side heat transfer tube 4a and the water supply side heat transfer tube 4b. Then, it returns to the hot water storage tank 19 through the hot water supply mixing valve 14. This is circulated until the hot water in the hot water storage tank 19 reaches a predetermined amount.

  The tank circulation pump 13 is operated only during the tank hot water storage operation to perform water circulation. That is, it is not energized at other times, and the water supply is allowed to pass without resistance in an open state.

  (Bath bathing operation) Next, bath bathing operation will be described.

  The water supply path for bath hot water operation is as follows: water supply source 10 → water supply fitting 11 → pressure reducing valve 12 → water supply side heat transfer pipe 4b of hot water supply heat exchanger 4 → hot water mixing valve 14 → hot water adjustment valve 21 → bath pouring valve 22 → In this order, the water check valve 23 → the bath return fitting 27 → the bath tub 24. Here, in the bath hot water operation, the first system heat pump refrigerant circuit is operated and the hot water adjustment valve 21 is adjusted to adjust the water supply temperature. That is, the ratio between the hot water from the hot water supply mixing valve 14 side and the water from the water supply source 10 side is adjusted, the flow rate is adjusted by the bath pouring valve 22, and hot water supply is performed through the bath hot water outlet fitting 27. Do. The water check valve 23 is for preventing water in the bath tub 24 from flowing back to the kitchen hot water supply side.

  Moreover, a bath shower (not shown) can be used in the same manner as a bath hot water supply by connecting between the bath pouring valve 22 and the water check valve 23.

  (Floor heating operation) Next, the floor heating operation will be described.

  In the floor heating operation, the second system refrigerant circuit 42 operates. The refrigerant path is: compressor 1 → second system refrigerant distribution valve 3 → refrigerant side heat transfer pipe 7a of the heat exchanger 7 for bath → refrigerant side heat transfer pipe 8a of the heat exchanger 8 for floor heating → second system expansion valve 9 → Evaporator 6 → Compressor 1 in this order.

  The route of the heating medium for floor heating is: floor heating panel 28 → floor heating forward fitting 29 → heat medium tank 30 → floor heating circulation pump 31 → heat medium side heat transfer pipe 8b of the floor heating heat exchanger 8 → floor heating return. The order of the metal fittings 32.

  The high-temperature and high-pressure refrigerant compressed by the compressor 1 flows from the second system refrigerant distribution valve 3 through the bath heat exchanger 7 and into the refrigerant-side floor heating heat transfer pipe 8 a of the floor heating heat exchanger 8. Here, the heat medium flowing through the heat transfer pipe 8b for heat medium side floor heating is heated. Thereafter, the pressure is reduced by the second system expansion valve 9, and the low-temperature low-pressure gas is returned to the compressor 1 by the evaporator 6. By repeating this refrigerant circulation, the floor heating heat medium is continuously heated.

  In parallel with the operation of the second system refrigerant circuit 42, the floor heating circulation pump 31 is operated to circulate through the above-described heat medium path. That is, by the operation of the heat medium circulation cycle, heating in the floor heating heat exchanger 8 and heat radiation in the floor heating panel 28 are continuously performed.

  The second refrigerant circuit 42 is configured such that the high-temperature and high-pressure refrigerant compressed by the compressor 1 is sent to the floor heating heat exchanger 8 via the bath heat exchanger 7.

  Here, in the case where only the floor heating operation is performed without performing bath renewal, the bath circulation pump 26 is stopped. Thereby, since the water in the water side heat exchanger tube 7b of the heat exchanger for bath 7 stays without being circulated, heat loss from the refrigerant to the water can be suppressed.

  Further, although the floor heating heat exchanger 8 is installed on the downstream side of the refrigerant circuit, the floor heating is used at a low temperature for a long time as compared with the reheating of the bath, so there is no possibility of insufficient heating of the refrigerant.

  (Bath rebirth operation) Next, bath rebirth operation will be described.

  In the bath reheating operation, the second system refrigerant circuit 42 operates along the same route as in the floor heating operation.

  The path of the bath water is in the order of bath tub 24 → bath fitting 25 → bath circulation pump 26 → water heat transfer pipe 7 b of bath heat exchanger 7 → bath return fitting 27 → bath tub 24.

  The high-temperature and high-pressure refrigerant compressed by the compressor 1 flows into the refrigerant-side heat transfer pipe 7a of the bath heat exchanger 7 from the second system refrigerant distribution valve 3, and the hot water in the bath tub 24 flowing through the water-side heat transfer pipe 7b is used. Heat. The refrigerant passes through the floor heating heat exchanger 8, is decompressed by the second system expansion valve 9, and then returns to the compressor 1 as a low-temperature and low-pressure gas by the evaporator 6. By repeating this refrigerant circulation, the hot and cold water in the bath tub 24 is continuously heated.

  That is, the cold hot water in the bath tub 24 is sequentially heated by the bath heat exchanger 7 and returned to the bath tub 24. When the hot water in the bath tub 24 reaches the proper temperature, the bath renewal operation ends.

  In the bath reheating operation, the refrigerant that has become high temperature and high pressure by the compressor 1 directly enters the refrigerant side bath heat transfer pipe 7a of the bath heat exchanger 7 and flows through the water side bath heat transfer pipe 7b. Heat the hot water. As a result, the bath chase time can be shortened. The refrigerant flowing through the second system refrigerant circuit 42 is radiated to the heat medium side heat transfer tube 8b in the floor heating heat exchanger 8 after being heated in the bath heat exchanger 7. This corresponds to an increase in the capacity of the evaporator 6 and contributes to higher efficiency for the entire refrigerant circuit.

  (Operation Control) Next, operation control will be described.

  The operation control means 50 controls the following items according to the operation setting of the remote controller. (1) Operation and stop of the first system refrigerant circuit 41 and the second system refrigerant circuit 42. (2) The rotational speed of the compressor 1. (3) Opening and closing of the first system refrigerant distribution valve 2 and the second system refrigerant distribution valve 3. (4) Opening and closing of the first system expansion valve 5 and the second system expansion valve 9. (5) Operation and stop of the tank circulation pump 13, the bath circulation pump 26 and the floor heating circulation pump 31. (5) Opening and closing of the hot water supply mixing valve 14, the hot water mixing valve 15, the flow rate adjustment valve 16, the hot water adjustment valve 21, and the bath pouring valve 22. By performing the control for (1) to (5) in a batch by the operation control means 50, it is possible to smoothly perform general hot water supply operation, bath hot water supply operation, bath reheating operation, hot water storage operation, floor heating operation, etc. it can.

  Here, the operation control means 50 controls the rotational speed of the compressor 1. That is, immediately after the start of operation, the operation is performed at a predetermined high speed rotation in order to shorten the heating start-up time. During stable operation with a relatively light heat load, operation is performed at a medium to low speed corresponding to the heating temperature.

  Furthermore, the multi-functional heat pump water heater includes a pressure sensor (not shown) for detecting the discharge pressure of the compressor 1, a temperature thermistor for detecting a water supply temperature, a general hot water supply temperature, a bath hot water temperature, a floor heating temperature, and the like. And detection means, such as a flow rate sensor (not shown) which detects the amount of hot water supply and the amount of hot water bathing, are provided. The detection signals from these detection means are configured to be input to the operation control means 50. The operation control means 50 controls each device based on this detection signal.

  In FIG. 1 of the present embodiment, the bath heat exchanger 7 and the floor heating heat exchanger 8 are illustrated as separate bodies, but they may be integrated as shown by a dotted line A. That is, the heat exchanger for bath / floor heating is also used, and the upstream side is for bath and the downstream side is for floor heating.

  Thereby, size reduction of the whole heat exchanger 7 for baths and the heat exchanger 8 for floor heating and reduction of a heat dissipation loss can be aimed at. Moreover, although the downstream side of the refrigerant circuit is used for floor heating, since floor heating is used for a long time at a lower temperature than bathing, there is no possibility of insufficient heating of the refrigerant.

  (Operation during General Hot Water Supply Operation) Next, an embodiment of the operation operation of the multi-function heat pump water heater of the present invention when using general hot water will be described with reference to FIGS.

  When the hot water supply terminal 18 such as a kitchen faucet is opened, the use of hot water begins (step 60). The operation control means 50 opens the first system refrigerant distribution valve 2 and closes the second system refrigerant distribution valve 3. Furthermore, the compressor 1 is started and the operation of the first system refrigerant circuit 41 is started. The water supply source 10, the water supply fitting 11, the pressure reducing valve 12, the tank circulation pump 13, the water supply side heat transfer pipe 4 b, the hot water supply mixing valve 14, the hot water mixing valve 15, the flow rate adjusting valve 16, the hot water supply outlet fitting 17, and the hot water supply terminal 18 The hot water supply operation is started directly by the hot water supply circuit (step 61).

  Here, the operation control means 50 operates the compressor 1 with the rotation speed control means, and circulates the compressed high-temperature and high-pressure refrigerant. At the same time, the first system refrigerant distribution valve 2 is opened and the second system refrigerant distribution valve 3 is closed. Thus, the refrigerant circulates in the hot water supply heat exchanger 4, but the refrigerant is not circulated in the bath heat exchanger 7 and the floor heating heat exchanger 8. Further, the first system expansion valve 5 is adjusted to be opened, and the second system expansion valve 9 is closed.

  That is, the high-temperature high-pressure refrigerant compressed by the compressor 1 is sent to the refrigerant-side heat transfer tube 4a of the hot water supply heat exchanger 4 and heats the feed water flowing through the water-supply side heat transfer tube 4b. The heated hot water flows from the hot water supply mixing valve 14 to the hot water mixing valve 15 side.

  Here, immediately after the start of operation, the refrigerant fed into the hot water supply heat exchanger 4 is not sufficiently hot and high in pressure, and the temperature is low. Moreover, since the heat exchanger 4 for hot water supply is entirely cooled, the heating capability for heating water is not sufficient. Therefore, in parallel with the direct hot water supply operation (step 62), a tank hot water supply operation (step 63) for supplying hot water (for example, 65 ° C.) previously stored in the tank hot water storage operation is performed.

  Hot water supplied from the hot water storage tank 19 is mixed with hot water supplied from the hot water supply heat exchanger 4 by the hot water supply mixing valve 14. Further, an appropriate amount of cold water from the water supply source 10 side is mixed by the hot water / water mixing valve 15 so as to obtain an appropriate temperature (about 42 ° C.). Thereafter, hot water is supplied to the hot water supply terminal 18 through the flow rate adjusting valve 16 and the hot water supply outlet fitting 17.

  After the start of the direct hot water supply operation (step 62), the refrigerant becomes high temperature and pressure as time passes. Accordingly, the amount of heat released from the refrigerant increases, so that the ability to heat water increases. Here, the hot water supply temperature and flow rate are determined at any time (step 64), and if not specified, the compressor rotation speed is set so that the hot water supply temperature is set to a temperature set by a remote controller or the like (for example, about 42 ° C., hereinafter, appropriate temperature). Then, the control is performed by adjusting the expansion valve and adjusting the hot water supply mixing valve 14 and the hot water mixing valve 15.

  Further, the determination of the direct hot water supply temperature (step 67) is performed in parallel with the determination of the hot water supply temperature and flow rate (step 64), and if the direct hot water supply temperature is lower than the appropriate temperature (about 42 ° C.) (the specified value or less), the direct hot water supply The simultaneous operation of the operation and the tank hot water supply operation is continued (step 68). When the direct hot water supply temperature reaches an appropriate temperature (about 42 ° C.) (within the regulation), the tank hot water supply operation is stopped (step 69), and only the direct hot water supply operation is continued (step 66). Thereafter, the hot water supply operation is continued until the faucet of the hot water supply terminal 18 is closed and the use of the hot water supply is completed (step 70).

  In the direct hot water supply operation, the first system refrigerant circuit 41 of FIG. 1 is operated, and the compressor 1 performs rotation speed control by the operation control means 50. Thereby, for example, in summer when the temperature of the water supplied from the water supply of the water supply source 10 is high, a small heating amount is sufficient, so the rotation speed is slowed down. On the other hand, during the winter when the feed water temperature is low, a large amount of heating is required, so operation is performed at a high rotational speed. Further, the operation control means 50 performs control so as to adjust the opening of the expansion valve 4 during the stand-up operation to be small. Thereby, the circulation amount of a refrigerant | coolant can be decreased, the temperature of a refrigerant | coolant can be aimed at, and the heating rise time of a heat pump can be shortened.

  When the faucet of the hot water supply terminal 18 is closed and the use of hot water is finished (step 70), the operation control means 50 stops the operation of the first system refrigerant circuit 41 and the direct hot water supply operation is finished (step 71). At the same time, the hot water storage temperature and amount of hot water stored in the hot water storage tank 19 are determined (step 72). Accordingly, if it is less than the specified value, the tank hot water storage operation (step 73) is performed, and the determination of the hot water storage temperature and the hot water storage amount is performed again (step 74). If not, the tank hot water storage operation is continued (step 75).

  Then, after reaching the specified value, the tank hot water storage operation is terminated (step 76).

  When the direct hot water supply operation and the tank hot water storage operation are finished, the first system refrigerant distribution valve 2 is closed, the compressor 1 is stopped (step 77), and the process is finished (step 78).

  (Floor Heating Operation) Next, the floor heating single operation will be described with reference to FIGS.

  The temperature control of the floor heating operation in the present embodiment is performed by controlling the rotation speed of the compressor 1 and the opening degree of the second system expansion valve 9. That is, by changing the temperature and the circulation amount of the refrigerant, the temperature of the heat medium circulating through the floor heating panel 28 is adjusted to control the heating amount of the floor heating panel 28.

  When the floor heating button is turned on and floor heating use is started (step 80), the operation control means 50 closes the first system refrigerant distribution valve 2 and opens the second system refrigerant distribution valve 3, and the first system expansion valve 5 Is closed to control the opening of the second system expansion valve 9. At the same time, the operation of the second system refrigerant circuit 42 and the floor heating circulation pump 31 is started (step 81).

  Next, the operation control means 50 determines the forward temperature of the heat medium heated in the floor heating heat exchanger 8 (step 82) and the return temperature of the heat medium radiated in the floor heating panel 28 (step 82). )I do.

  Then, it is determined whether the floor heating heating amount is excessive or insufficient, and the floor heating heating amount is adjusted by controlling the rotation speed of the compressor 1 and the opening of the second system expansion valve 9 (step 83). To optimize.

  Further, a set time elapse determination of the floor heating usage time is performed (step 84). If it is within the set time, the operation is continued, and if the set time is exceeded, the operation of the second system refrigerant circuit 42 and the operation of the floor heating circulation pump 31 are performed. Is stopped (step 85), and the use of floor heating is terminated (step 86).

  In addition, although each operation | movement is described in the flowchart in series, this is for convenience and does not necessarily prescribe | regulate an order, floor heating going-out temperature determination, floor heating return temperature determination (step 82), and setting Time passage determination (step 84) is always performed in parallel.

  The temperature adjustment of the floor heating is also performed by opening / closing control of the floor heating circulation pump 31 that circulates the heat medium. That is, it is performed by adjusting the flow rate of the heat medium.

  (Bath bathing operation and bath bathing operation) Next, referring to FIG. 1 and FIG.

  First, bath hot water filling starts automatically or manually (step 90). Then, the operation control means 50 opens the first system refrigerant distribution valve 2, closes the second system refrigerant distribution valve 3, closes the first system expansion valve 5, and closes the second system expansion valve 9. In addition, the hot water mixing valve 15 is closed on the side of the water supply source 10 and the hot water adjustment valve 21 is adjusted in opening, and the compressor 1 is started to start the operation of the first system refrigerant circuit 41. 11, pressure reducing valve 12, tank circulation pump 13, water supply side heat transfer pipe 4 b, hot water supply mixing valve 14, hot water adjustment valve 21, bath pouring valve 22, water check valve 23, bath hot water outlet fitting 27, bath tub 24 bath The hot water supply operation is started directly by the hot water circuit (step 91).

  Here, immediately after the start of the direct hot water supply operation (step 92) by the first system refrigerant circuit 41, the heating capacity for heating water is not sufficient. Therefore, similarly to the general hot water supply operation described with reference to FIG. 2, the tank hot water supply operation (step 93) is performed in parallel with the direct hot water supply operation (step 92), and hot water at an appropriate temperature (about 42 ° C.) is supplied.

  In addition, the tank hot water supply operation at the time of bath hot water filling (step 93) includes the water supply source 10, the water supply fitting 11, the pressure reducing valve 12, the hot water storage tank 19, the hot water supply mixing valve 14, the hot water adjustment valve 21, the bath pouring valve 22, and the water reverse. Hot water is supplied by a hot water filling circuit of a stop valve 23, a bath hot water outlet 27, and a bath tub 24.

  During bath bathing operation, determination of hot water supply temperature and flow rate is performed at any time (step 94). If not specified, the rotation speed control of the compressor 1 and the opening control of the first system expansion valve 5 and the opening control of the hot water mixing valve 14 and hot water mixing valve 15 so that the hot water supply temperature becomes an appropriate temperature (about 42 ° C.). To adjust the hot water supply temperature (step 95). At the same time, the flow rate is adjusted by the flow rate adjustment valve 16.

  In parallel with the determination of the hot water supply temperature and flow rate (step 94), the determination of the hot water supply temperature is directly performed (step 97). If the direct hot water supply temperature is lower than the appropriate temperature (about 42 ° C.) and below the specified value, the simultaneous operation of the direct hot water supply operation and the tank hot water supply operation is continued (step 98). When the required flow rate is reached and within the specified range, the tank hot water supply operation is stopped (step 99) and only the direct hot water supply operation is continued. Furthermore, the bath hot water amount is determined (step 94). If the hot water amount is less than the specified hot water amount, the hot water supply operation is continued. If the predetermined hot water amount is reached, the operation of the first system refrigerant circuit 41 is stopped. The bath hot water driving operation ends (step 96).

  After bathing, the bath temperature in the bath tub 24 decreases with time. Therefore, when bath renewal is started by bath automatic or manual setting (step 101), the operation control means 50 closes the first system refrigerant distribution valve 2, opens the second system refrigerant distribution valve 3, and opens the first system expansion valve. 5 is closed, the opening degree of the second system expansion valve 9 is controlled, the bath circulation pump 26 and the compressor 1 are started, the operation of the second system refrigerant circuit 42 is started, the bath tub 24, the bath circulation fitting 25, the bath The bath reheating operation is performed by the water circulation circuit of the circulation pump 26, the water-side bath heat transfer tube 7b of the bath heat exchanger 7, the bath hot water outlet fitting 27, and the bath tub 24.

  The bath water temperature is detected at any time, and if the bath water temperature is lower than the specified temperature in the bath water temperature determination after the start of the bath chasing operation (step 102), the bath chasing operation is continued (step 103). When the temperature is reached, the operation of the second system refrigerant circuit 42 and the operation of the bath circulation pump 26 are stopped (step 104), and the bath replenishment ends (step 105).

  The temperature adjustment for bathing is also performed by opening / closing control of the bath circulation pump 26. That is, the temperature is adjusted by controlling the flow rate of water.

  (Floor Heating Operation and Bath Pursuit Operation) Next, the operation when the floor heating operation and the bath follow-up operation are performed simultaneously will be described with reference to FIGS.

  Note that the individual operations of the floor heating operation and the bath follow-up operation are the same as those described with reference to FIGS. 3 and 4, and therefore details of the floor heating operation and the bath follow-up operation are omitted.

  In general, floor heating is used for a long time from morning to evening, particularly from evening to night. In addition, bathing is often used in a short time and relatively late at night. Therefore, an example of the operation when the floor heating is used first and the bath is reheated while the floor heating is used will be described.

  When bath reheating is started automatically or manually (step 110), it is determined whether or not the floor heating operation is being performed (step 111). Here, if it is not under floor heating operation, it will transfer to Step 101 of Drawing 4, and will perform bath rebirth operation (Step 112). On the other hand, when the floor heating operation is being performed, the operation control means 50 starts the operation of the second system refrigerant circuit 42 (step 114), and at the same time, proceeds to step 82 to continue the floor heating operation (step 117). ).

  Here, when bath reheating is performed during floor heating, the heating performance of the second-system refrigerant circuit 42 in the floor heating heat exchanger 8 is the amount of heat radiated to the bath circulating water in the bath heat exchanger 7. Since there is a shortage, the operation control means performs bath temperature determination (step 115) and calculates the amount of heat necessary for bath renewal. Thereby, the rotational speed control of the compressor 1 and the opening degree control of the second system expansion valve 9 are performed (step 116) so that the heating capacity is sufficient and suitable for bathing and floor heating.

  Further, in the bath water temperature determination (step 115), if the temperature is lower than the specified temperature, the bath renewal operation is continued (step 116), and when the specified temperature is reached, the bath circulation pump 26 is stopped and the bath renewal is ended. (Step 118).

  Even when the bath reheating is finished (step 118), the rotation speed control of the compressor 1 and the opening degree control of the second system expansion valve 9 (step 84) are performed so that the floor heating becomes an appropriate temperature. Heating operation is continued.

  Further, in the floor heating set time elapse determination (step 84), when the set time is reached, the operation of the second system refrigerant circuit 42 and the operation of the floor heating circulation pump 31 are stopped (step 85), and the use of the floor heating is ended. (Step 86).

  In the case of simultaneous operation of floor heating and bath reheating, floor heating is used for a relatively long time (for example, 1 to 2 hours), while bath reheating is generally performed from a bath hot water temperature (about 42 ° C.) to 5 ° C. It is operated at a level of ˜6 ° C. and ends in a few minutes. In many cases, just before bathing or just before bathing, it is necessary to reach an appropriate temperature (about 42 ° C.) in a short time.

  In this configuration, a bath heat exchanger 7 that requires high-temperature heat exchange in a short time is installed on the upstream side of the refrigerant flow path, and the floor heating heat exchanger 8 that is used for a long time at low temperature is used as a refrigerant. Install in series downstream. Thereby, since the high-temperature refrigerant flows through the heat exchanger for bath 7 and the low-temperature refrigerant after heat exchange in the heat exchanger for bath 7 flows through the heat exchanger for floor heating 8, heat loss can be reduced. .

  The flow rate of the bath water is adjusted by the bath circulation pump 26, and the flow rate of the heat medium is adjusted by the floor heating circulation pump 31. As a result, even if the bath reheating and floor heating are set to different proper temperatures, the proper temperature can be set by the open / close control of the circulation pump, so that operation with reduced heat loss can be performed.

  Further, in the embodiment of the present invention, the refrigerant cycle circuit has one cycle and two systems each having one compressor 1 and one evaporator 6, but the invention is not limited to this, and there are two compressors and evaporators. The two-cycle method has the same effect.

1 is an overall system diagram of a multifunction heat pump water heater of the present invention. The flowchart which shows one Example of the hot_water | molten_metal supply driving | operation in the multifunctional type heat pump water heater of this invention. The flowchart which shows one Example of the floor heating driving | operation in the multifunctional heat pump water heater of this invention. The flowchart which shows one Example of the bath hot water filling operation and the bath reheating operation in the multifunctional type heat pump water heater of the present invention. The flowchart which shows one Example of the floor heating operation in the multifunctional heat pump water heater of this invention, and a bath reheating operation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 1st system refrigerant | coolant distribution valve 3 2nd system refrigerant | coolant distribution valve 4 Hot water supply heat exchanger 5 1st system expansion valve 6 Evaporator 7 Bath heat exchanger 8 Floor heating heat exchanger 9 2nd system expansion Valve 12 Pressure reducing valve 13 Tank circulation pump 14 Hot water mixing valve 15 Hot water mixing valve 16 Flow rate adjustment valve 19 Hot water storage tank 21 Hot water adjustment valve 22 Bath pouring valve 23 Water check valve 24 Bathtub 26 Bath circulation pump 28 Floor heating panel 30 Heat Medium tank 31 Floor heating circulation pump 40 Heat pump refrigerant circuit 41 First system refrigerant circuit 42 Second system refrigerant circuit 45 Water circuit 50 Operation control means

Claims (7)

In a heat pump water heater having a compressor and an evaporator,
A first heat exchanger that exchanges heat between the supplied water and the refrigerant;
A first refrigerant circuit having the compressor, the first heat exchanger, and the evaporator;
A second refrigerant circuit having a second heat exchanger connected to the compressor and the evaporator and connected in parallel to the first heat exchanger;
A hot water supply circuit connected to the first heat exchanger;
A bath reheating water circuit or a floor heating heat medium circuit connected to the second heat exchanger;
A heat pump water heater characterized by comprising: In a heat pump water heater having a compressor and an evaporator,
A first heat exchanger for exchanging heat between the water supplied from the water supply unit and the refrigerant;
A second heat exchanger that exchanges heat between the water sent from the bath tub and the refrigerant;
A third heat exchanger for exchanging heat between the heat medium sent from the floor heating panel and the refrigerant;
A first refrigerant circuit having the compressor, the first heat exchanger, and the evaporator;
A second refrigerant circuit having a second heat exchanger and a third heat exchanger connected to the compressor and the evaporator and connected in parallel to the first heat exchanger;
A hot water supply circuit connected to the first heat exchanger;
A bath reheating water circuit connected to the second heat exchanger;
A floor heating heat medium circuit connected to the third heat exchanger;
The heat pump water heater characterized by having. In a heat pump water heater having a compressor and an evaporator,
A first heat exchanger that exchanges heat between the water supplied from the water supply terminal and the refrigerant;
A second heat exchanger that exchanges heat between the water sent from the bath tub and the refrigerant;
A third heat exchanger that exchanges heat between the heat medium sent from the floor heating panel and the refrigerant;
A first refrigerant circuit in which the compressor, the first refrigerant distribution valve, the first heat exchanger, the first expansion valve, and the evaporator are sequentially connected;
A second refrigerant circuit in which the compressor, the second refrigerant distribution valve, the second heat exchanger, the third heat exchanger, a second expansion valve, and the evaporator are sequentially connected;
A hot water supply circuit connected to the first heat exchanger and having a first circulation pump;
A bath reheating water circuit having a second circulation pump connected to the second heat exchanger;
A floor heating heat medium circuit connected to the third heat exchanger and having a third circulation pump;
A heat pump water heater characterized by comprising: A first refrigerant circuit having a compressor, an evaporator, and a first heat exchanger;
A second refrigerant circuit having a second heat exchanger connected to the compressor and the evaporator and connected in parallel to the first heat exchanger;
A hot water supply circuit connected to the first heat exchanger;
A bath water supply circuit connected to the heat exchanger in the upstream portion of the second heat exchanger;
A floor heating heat medium circuit connected to a heat exchanger in a downstream portion of the second heat exchanger;
A heat pump water heater characterized by comprising. In the heat pump water heater according to any one of claims 1 to 4,
A heat pump water heater comprising a tank hot water supply circuit having a hot water storage tank and a hot water supply mixing valve and connected in parallel with the hot water supply water circuit. In the heat pump water heater according to claim 2,
A heat pump water heater having a valve for distributing the refrigerant to a branch portion between the first refrigerant circuit and the second refrigerant circuit. In the heat pump water heater according to claim 1 to 4,
The hot water supply water circuit is characterized in that the supplied water is heat-exchanged by a first heat exchanger and directly supplied from a hot water supply terminal.

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