JP2014077592A - Hot water supply heating system, heat pump and condenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology capable of operating a heat pump with high COP, in a hot water supply heating system performing heating and hot water supply by using the heat pump.SOLUTION: A hot water supply heating system includes: a heat pump including a compressor, a condenser for condensing a refrigerant by heat exchange with a heat medium for heating and/or water for hot water supply, an expander, and an evaporator; a heater for circulating the heat medium for heating between the condenser and a heating terminal; and a water heater for supplying the water for hot water supply from a water supply source to a hot water supply point via the condenser. In the condenser, the refrigerant and the heat medium for heating flow as counterflow, and the refrigerant and the water for hot water supply flow as counterflow. The condenser includes a three-fluid heat exchanger performing both of heat exchange between the refrigerant and the heat medium for heating, and heat exchange between the refrigerant and the water for hot water supply, and a two-fluid heat exchanger disposed at a downstream side with respect to the three-fluid heat exchanger when viewed from refrigerant flow, and performing only the heat exchange between the refrigerant and the water for hot water supply.

Description

  The present invention relates to a hot water supply / heating system, a heat pump, and a condenser.

  Patent Document 1 discloses a compressor that pressurizes a refrigerant, a condenser that condenses the refrigerant by heat exchange between bath water and / or hot water, an expander that decompresses the refrigerant, and an evaporator that vaporizes the refrigerant. A hot water supply system including a heat pump, a reheating mechanism that circulates bathtub water between the condenser and the bathtub, and a hot water supply system that supplies hot water from the water supply source to the hot water supply location via the condenser is disclosed. . According to this bath hot water supply system, it is possible to perform both hot water supply to the hot water supply location and reheating of the bath by using heating by an energy efficient heat pump.

JP 2003-65602 A

  There is a case where it is desired to perform both heating at a heating terminal and hot water supply to a hot water supply location using heating by a heat pump. In the technique of Patent Document 1, instead of circulating the bathtub water between the condenser and the bathtub, if the heating medium is circulated between the condenser and the heating terminal, the heating by the heat pump is used. Both heating at the heating terminal and hot water supply to the hot water supply location can be performed. However, such a configuration causes the following problems.

  In general, the temperature of hot water supplied from the water supply source to the condenser is sufficiently low, but the heating medium returned from the heating terminal to the condenser contains residual heat and is not so low. For this reason, in the configuration as described above, the heat transfer from the heating medium returned from the heating terminal to the condenser to the low-temperature refrigerant near the outlet of the condenser is caused by heat transfer from the condenser. The temperature of the refrigerant sent to the expander is increased. If the temperature of the refrigerant sent from the condenser to the expander increases, the COP of the heat pump will decrease.

  The present specification provides a technique for solving the above problems. The present specification provides a technique capable of operating a heat pump at a high COP in a hot water supply and heating system that performs heating and hot water supply using a heat pump.

  A hot water supply and heating system disclosed in the present specification includes a compressor that pressurizes the refrigerant, a condenser that condenses the refrigerant by heat exchange between the heating medium and / or hot water, and an expander that decompresses the refrigerant. , A heat pump having an evaporator for vaporizing the refrigerant, a heater for circulating a heating medium between the condenser and the heating terminal, and a water heater for supplying hot water from a water supply source to the hot water supply location via the condenser It has. In the hot water supply and heating system, in the condenser, the refrigerant and the heating medium flow as a counter flow, and the refrigerant and the hot water supply water flow as a counter flow. In the hot water supply and heating system, the condenser includes a three-fluid heat exchanger that performs both heat exchange between the refrigerant and the heating medium, and heat exchange between the refrigerant and the hot water, and a three-fluid heat exchanger. A two-fluid heat exchanger that performs only heat exchange between the refrigerant and the hot water supply water is provided downstream of the fluid heat exchanger.

  In the above hot water supply and heating system, in the condenser, in the upstream three-fluid heat exchanger as viewed from the refrigerant flow, heat exchange between the refrigerant and the heating medium and heat exchange between the refrigerant and the hot water supply water are performed. Both are performed, and the two-fluid heat exchanger on the downstream side as viewed from the refrigerant flow only performs heat exchange between the refrigerant and the hot water supply water. By adopting such a configuration, heat transfer from the heating medium that is not so low temperature that is sent from the heating terminal to the condenser is prevented from being transferred to the low-temperature refrigerant in the vicinity of the outlet of the condenser, and the condenser expands. The temperature of the refrigerant sent to the vessel can be made sufficiently low. The COP of the heat pump can be improved.

  In the above hot water supply and heating system, the condenser is formed with a refrigerant pipe through which the refrigerant flows and a length shorter than the refrigerant pipe, and is substantially the same as the heating pipe through which the heating heat medium flows and the refrigerant pipe. It is formed in length and includes a hot water supply pipe through which hot water supply water flows, and on the upstream side of the refrigerant pipe, a three-fluid heat exchanger is formed by the refrigerant pipe, the heating pipe, and the hot water supply pipe, On the downstream side of the refrigerant pipe, a two-fluid heat exchanger can be configured by the refrigerant pipe and the hot water supply pipe.

  According to the hot water supply and heating system, a condenser including a three-fluid heat exchanger and a two-fluid heat exchanger can be realized with a simple structure and a small number of parts.

  In the hot water supply and heating system, the heating pipe is arranged so as to pass through the inside of the refrigerant pipe, and the hot water supply pipe can be arranged such that the refrigerant pipe and the outer wall surface are in contact with each other.

  In the hot water supply and heating system, a large heat transfer area can be ensured between the refrigerant and the heating medium. Further, in the above hot water supply and heating system, even when one outer wall surface of the refrigerant pipe and the hot water supply pipe is damaged due to corrosion or the like, the refrigerant and the hot water supply water are separated by the other outer wall surface of the refrigerant pipe and the hot water supply pipe. Mixing can be prevented. The occurrence of cross connection between the refrigerant and the hot water supply water can be prevented.

  The present specification also discloses a heat pump. The heat pump includes a compressor that pressurizes the refrigerant, a condenser that condenses the refrigerant by heat exchange between the heating medium and / or hot water supply water, an expander that decompresses the refrigerant, and an evaporator that vaporizes the refrigerant. It has. In the heat pump, in the condenser, the refrigerant and the heating medium flow as a counter flow, and the refrigerant and hot water supply water flow as a counter flow. In the heat pump, the condenser includes a three-fluid heat exchanger that performs both heat exchange between the refrigerant and the heating medium, and heat exchange between the refrigerant and hot water, and three-fluid heat as viewed from the refrigerant flow. A two-fluid heat exchanger that performs only heat exchange between the refrigerant and the hot water supply water is provided downstream of the exchanger.

  This specification also discloses a condenser. The condenser condenses the refrigerant of the heat pump by heat exchange with the heating medium and / or hot water supply water. In the condenser, the refrigerant and the heating medium flow as a counter flow, and the refrigerant and hot water supply water flow as a counter flow. The condenser is composed of a three-fluid heat exchanger that performs both heat exchange between the refrigerant and the heating medium, and heat exchange between the refrigerant and hot water, and a three-fluid heat exchanger as viewed from the refrigerant flow. On the downstream side, a two-fluid heat exchanger that performs only heat exchange between the refrigerant and the hot water supply water is provided.

It is a figure which shows typically the structure of the hot-water supply heating system 2 of Example 1. FIG. It is a perspective view which shows the external appearance of the condenser 58 of Example 1. FIG. It is a longitudinal cross-sectional view about the AA cross section of FIG. It is a longitudinal cross-sectional view about the BB cross section of FIG. FIG. 3 is a Th diagram for the heat pump 50 of the first embodiment. It is Th diagram about the heat pump 50 of a prior art. It is a figure which shows typically the structure of the hot water supply heating system 202 of Example 2. FIG.

Example 1
FIG. 1 shows a hot water supply / heating system 2 of the present embodiment. The hot water supply / heating system 2 includes a tank unit 4 (corresponding to a hot water heater), a heat pump unit 6, a heat source unit 8 (corresponding to a heater), and a control device 100.

The heat pump unit 6 includes a heat pump 50 and a hot water circulation pump 22. The heat pump 50 includes a refrigerant circulation path 52 for circulating a refrigerant (for example, an HFC refrigerant such as R410A and a CO ₂ refrigerant such as R744), an evaporator 54, a fan 56, a compressor 62, a condenser 58, and an expansion. This is a heat pump cycle including the vessel 60.

  The evaporator 54 exchanges heat between the outside air blown by the fan 56 and the refrigerant in the refrigerant circulation path 52. The evaporator 54 is supplied with a refrigerant in a low-pressure and low-temperature liquid state after passing through the expander 60. The evaporator 54 heats the refrigerant by exchanging heat between the refrigerant and the outside air. The refrigerant is vaporized by being heated, and is in a gas state at a relatively high temperature and a low pressure.

  The refrigerant after passing through the evaporator 54 is supplied to the compressor 62. That is, the compressor 62 is supplied with a refrigerant in a gaseous state at a relatively high temperature and low pressure. When the refrigerant is pressurized by the compressor 62, the refrigerant becomes a high-temperature and high-pressure gas state. The compressor 62 sends out the pressurized high-temperature and high-pressure gaseous refrigerant to the condenser 58.

  The condenser 58 is supplied with a high-temperature and high-pressure gaseous refrigerant sent out from the compressor 62. The condenser 58 can exchange heat between the refrigerant in the refrigerant circuit 52 and water in a tank water circuit 20 (to be described later). Furthermore, the condenser 58 can exchange heat between the refrigerant in the refrigerant circulation path 52 and water in the second heating heating path 84 described later (hereinafter also referred to as heating water). As a result of the heat exchange in the condenser 58, the refrigerant is deprived of heat and condensed. Thereby, a refrigerant | coolant will be in a high-pressure liquid state with a comparatively low temperature.

  The expander 60 is supplied with a relatively low-temperature and high-pressure liquid refrigerant after passing through the condenser 58. The refrigerant is depressurized by passing through the expander 60 and becomes a low-temperature and low-pressure liquid state. As the expander 60, for example, an expansion valve or a capillary tube can be used. The refrigerant that has passed through the expander 60 is sent to the evaporator 54 as described above.

  When the compressor 62 is operated in the heat pump 50, the refrigerant in the refrigerant circulation path 52 circulates in the order of the evaporator 54, the compressor 62, the condenser 58, and the expander 60. In this case, in the condenser 58, the hot water supply water in the tank water circulation path 20 or the heating water in the second heating heating path 84 is heated.

  The tank unit 4 includes a tank 10. The tank 10 stores hot water supplied by the heat pump 50. The hot water supply water in this embodiment is tap water. The tank 10 is a hermetically sealed type, and the outside is covered with a heat insulating material. Water for hot water supply is stored in the tank 10 until it is full.

  The tank water circulation path 20 has an upstream end connected to the lower part of the tank 10, passes through the condenser 58 of the heat pump unit 6, and has a downstream end connected to the upper part of the tank 10. A water circulation pump 22 for hot water supply of the heat pump unit 6 is interposed in the tank water circulation path 20. In the heat pump unit 6, when the heat pump 50 is operated to drive the hot water supply water circulation pump 22, the hot water supply water at the lower part of the tank 10 is sent to the condenser 58 and heated, and the heated hot water supply water is supplied to the upper part of the tank 10. Returned. Inside the tank 10, a temperature stratification is formed in which a layer of hot water supply water is stacked on a layer of low temperature hot water supply water.

  The upstream end of the tap water introduction path 24 is connected to a tap water supply source 32 (corresponding to a water supply source) outside the hot water supply and heating system 2. The downstream side of the tap water introduction path 24 is branched into a first introduction path 24a and a second introduction path 24b. The downstream end of the first introduction path 24 a is connected to the lower part of the tank 10. The downstream end of the second introduction path 24 b is connected in the middle of the first hot water supply path 36.

  An upstream end of the first hot water supply path 36 is connected to the upper part of the tank 10. As described above, the second introduction path 24 b of the tap water introduction path 24 is connected to the middle of the first hot water supply path 36. A mixing valve 30 is interposed at the connection between the first hot water supply path 36 and the second introduction path 24b. The mixing valve 30 adjusts the ratio of the flow rate of hot water for hot water flowing into the first hot water supply path 36 from the upper part of the tank 10 and the flow rate of cold tap water flowing into the first hot water supply path 36 from the second introduction path 24b. To do. The first hot water supply path 36 on the downstream side of the connection portion with the second introduction path 24 b passes through the hot water supply heating path 37 of the heat source unit 8 and is connected to the second hot water supply path 39. The first hot water supply path 36 and the second hot water supply path 39 are connected by a heat source unit bypass path 33. A bypass valve 34 is interposed in the heat source bypass path 33. The downstream end of the second hot water supply passage 39 is connected to a hot water tap 38 (corresponding to a hot water supply location).

  The heat source unit 8 includes a cistern 70, a heating burner 82, and a hot water supply burner 81. The cistern 70 is a container having an open top and stores heating water (corresponding to a heating medium). The heating water in this embodiment is, for example, an antifreeze liquid. The upstream end of the heating forward path 72 is connected to the systern 70. A heating water circulation pump 74 is interposed in the heating forward path 72. When the heating water circulation pump 74 is driven, the heating water in the systern 70 flows into the heating forward path 72.

  The downstream end of the heating forward path 72 is branched into a first heating heating path 73 and a low temperature heating circulation path 75. A low temperature heating terminal 78 is attached to the low temperature heating circuit 75. The low temperature heating terminal 78 of the present embodiment is, for example, a floor heater. The low-temperature heating terminal 78 heats using the heat of the supplied heating water. A heating burner 82 is interposed in the first heating heating path 73. The heating burner 82 heats the heating water in the first heating heating path 73. The downstream end of the first heating heating path 73 branches into a high temperature heating circulation path 77 and a reheating circulation path 79. A high temperature heating terminal 76 is attached to the high temperature heating circuit 77. The high temperature heating terminal 76 of the present embodiment is, for example, a bathroom heating dryer. The high temperature heating terminal 76 heats using the heat of the supplied heating water. The low temperature heating circuit 75 and the high temperature heating circuit 77 merge at their downstream ends and are connected to the upstream end of the second heating heating path 84.

  The downstream end of the second heating / heating path 84 passes through the condenser 58 of the heat pump unit 6 and is connected to the upstream end of the heating return path 96. The downstream end of the heating return path 96 is connected to the systern 70 of the heat source unit 8.

  A reheating heat valve 83 and a reheating heat exchanger 97 are interposed in the reheating circulation path 79. The reheating thermal valve 83 opens and closes the reheating circulation path 79. In the reheating heat exchanger 97, heat exchange is performed between the heating water flowing in the reheating circulation path 79 and the bathtub water flowing in the bathtub water circulation path 91. The downstream end of the recirculation circulation path 79 is connected to the heating return path 96.

  The upstream end of the bathtub water circulation path 91 is connected to the bottom of the bathtub 98. The downstream end of the bathtub water circulation path 91 is connected to the side of the bathtub 98. A bathtub water circulation pump 99 is interposed in the bathtub water circulation path 91. When the bathtub water circulation pump 99 is driven, the bathtub water sucked out from the bottom of the bathtub 98 passes through the reheating heat exchanger 97 and is returned to the side of the bathtub 98.

  A hot water supply burner 81 is interposed in the hot water supply heating path 37. From the downstream side of the hot water supply burner 81 of the hot water supply heating path 37, the bathtub pouring path 40 is branched. The bathtub pouring passage 40 is provided with a pouring solenoid valve 42 for opening and closing the bathtub pouring passage 40. The downstream end of the bathtub pouring channel 40 is connected to the bathtub water circulation pump 99.

  The control device 100 controls the operation of each component of the tank unit 4, the heat pump unit 6, and the heat source unit 8.

  The hot water supply / heating system 2 can perform a heat storage operation, a hot water supply operation, a heating operation, a hot water operation, and a reheating operation as follows.

(Heat storage operation)
In the heat storage operation, the hot water supply water in the tank 10 is heated by the heat pump 50, and the hot water supply water that has reached a high temperature is returned to the tank 10. When executing the heat storage operation, the control device 100 drives the compressor 62 and the fan 56 to operate the heat pump 50 and also drives the hot water supply water circulation pump 22.

  By driving the compressor 62, the refrigerant in the refrigerant circulation path 52 circulates in the order of the evaporator 54, the compressor 62, the condenser 58, and the expander 60. In this case, the refrigerant in the refrigerant circuit 52 passing through the condenser 58 is in a high-temperature and high-pressure gas state. Further, the hot water supply water circulating pump 20 drives the hot water supply water in the tank 10 to circulate in the tank water circulation path 20. That is, hot water supply water existing in the lower part of the tank 10 is introduced into the tank water circulation path 20, and when the introduced hot water supply water passes through the condenser 58, it is heated by the heat of the refrigerant in the refrigerant circulation path 52. The supplied hot water is returned to the upper part of the tank 10. Thereby, hot water for hot water supply is stored in the tank 10. When the inside of the tank 10 is in a fully stored state filled with hot water for hot water supply, the heat storage operation is terminated.

(Hot water operation)
The hot water supply operation is an operation of supplying hot water in the tank 10 to the hot water tap 38. The hot water supply operation can also be performed in parallel with the above heat storage operation. When the hot-water tap 38 is opened, tap water flows into the lower part of the tank 10 from the tap water introduction path 24 (first introduction path 24a) due to the water pressure from the tap water supply source 32. At the same time, the hot water supply water in the upper part of the tank 10 is supplied to the hot water tap 38 via the first hot water supply path 36.

  When the temperature of the hot water supplied from the tank 10 to the first hot water supply path 36 is higher than the set hot water temperature, the control device 100 drives the mixing valve 30 to connect the first hot water supply path 36 from the second introduction path 24b. Introduce tap water. Therefore, the hot water supply water supplied from the tank 10 and the tap water supplied from the second introduction path 24 b are mixed in the first hot water supply path 36. The control device 100 adjusts the opening of the mixing valve 30 so that the temperature of the hot water supplied to the hot water tap 38 coincides with the hot water set temperature. On the other hand, when the temperature of the hot water supplied from the tank 10 to the first hot water supply path 36 is lower than the set hot water temperature, the control device 100 heats the water passing through the first hot water supply path 36 by the hot water supply burner 81. To do. The control device 100 controls the output of the hot water supply burner 81 so that the temperature of the hot water supply water supplied to the hot water tap 38 matches the hot water supply set temperature.

(Heating operation)
The heating operation is an operation in which heating water is heated by the heat pump 50 and heated by the low-temperature heating terminal 78 or the high-temperature heating terminal 76 using the heating water having a high temperature. When the execution of the heating operation is instructed by the user, the control device 100 rotates the heating water circulation pump 74. Further, the control device 100 drives the compressor 62. As a result, the heating water heated by the condenser 58 is supplied to the low temperature heating terminal 78 and the high temperature heating terminal 76 via the cistern 70. Furthermore, the control apparatus 100 operates the heating burner 82 as necessary. As a result, the high-temperature heating terminal 76 is supplied with heating water that has been heated to a higher temperature by the heating by the heating burner 82. In the heating operation, so that the temperature of the heating water supplied to the low temperature heating terminal 78 becomes the low temperature heating set temperature, and the temperature of the heating water supplied to the high temperature heating terminal 76 becomes the high temperature heating set temperature, The operation of the heat pump 50 and the output of the heating burner 82 are adjusted.

(Hot water operation)
The hot water operation is an operation in which hot water is applied to the bathtub 98. When the user instructs the start of hot water operation, the hot water supply / heating system 2 starts the hot water operation. In the hot water operation, the hot water solenoid valve 42 is opened. When the hot water solenoid valve 42 is opened, tap water flows into the lower part of the tank 10 from the tap water introduction path 24 (first introduction path 24a) due to the water pressure from the tap water supply source 32. At the same time, the hot water supply water in the upper part of the tank 10 is supplied to the bathtub 98 via the first hot water supply path 36, the hot water supply heating path 37, the bathtub pouring path 40, and the bathtub water circulation path 91. In the hot water operation, the temperature of the water supplied to the bathtub pouring channel 40 is adjusted to the hot water setting temperature in the same manner as in the hot water operation. When the flow rate of water supplied to the bathtub 98 reaches the hot water set water amount, the hot water operation is terminated.

(Reaping driving)
The chasing operation is an operation for chasing the bathtub water stored in the bathtub 98. When the user instructs the start of the chasing operation, the hot water supply / heating system 2 starts the chasing operation. In the reheating operation, the bathtub water circulation pump 99 is driven. Further, the reheating heat valve 83 is opened, and the heating water circulation pump 74 is driven. Thereby, bathtub water is sucked out from the bottom part of the bathtub 98, and is heated by heat exchange with the heating water in the reheating heat exchanger 97. The heated bathtub water is returned to the side of the bathtub 98. In the reheating operation, the heating water is heated by the heat pump 50 and the heating water is heated by the heating burner 82 in the same manner as in the heating operation.

(Condenser configuration)
As shown in FIGS. 2, 3, and 4, the condenser 58 mainly includes a first pipe 102, a second pipe 104, and a third pipe 106. Heating water from the second heating / heating path 84 flows through the first pipe 102, refrigerant from the refrigerant circulation path 52 flows through the second pipe 104, and hot water supply water from the tank water circulation path 20 flows through the third pipe 106. As shown in FIG. 2, the condenser 58 is formed by spirally winding a combination of these pipes.

  As shown in FIG. 3, the 1st pipe | tube 102 is comprised from small diameter piping, and the 2nd pipe | tube 104 is comprised from large diameter piping. The first tube 102 is disposed so as to pass through the inside of the second tube 104. In other words, the first tube 102 and the second tube 104 form a double tube. As shown in FIG. 2, the upstream end and the downstream end of the first pipe 102 are exposed to the outside of the second pipe 104, and constitute a heating water inlet 102a and a heating water outlet 102b, respectively. A refrigerant inlet 104a and a refrigerant outlet 104b are formed at the upstream end and the downstream end of the second pipe 104, respectively. The first pipe 102 is formed shorter than the second pipe 104, and the heating water outlet 102b of the first pipe 102 and the refrigerant inlet 104a of the second pipe 104 are formed in close proximity to each other. The heating water inlet 102a and the refrigerant outlet 104b of the second pipe 104 are formed at separate locations. In the section between the heating water inlet 102a of the first pipe 102 and the refrigerant outlet 104b of the second pipe 104, the first pipe 102 is not disposed inside the second pipe 104 as shown in FIG. Therefore, the heating water flowing through the first pipe 102 and the refrigerant flowing through the second pipe 104 exchange heat only in the section from the heating water inlet 102a to the heating water outlet 102b. In this section, the heating water flowing through the first pipe 102 and the refrigerant flowing through the second pipe 104 flow as counterflows.

  As shown in FIG. 3, the third pipe 106 is constituted by a pipe having substantially the same diameter as the first pipe 102. As shown in FIGS. 3 and 4, the second tube 104 and the third tube 106 are brazed to each other with the outer wall surfaces in contact with each other. As shown in FIG. 2, a hot water supply water inlet 106a and a hot water supply water outlet 106b are formed at the upstream end and the downstream end of the third pipe 106, respectively. The third pipe 106 is formed to have substantially the same length as the second pipe 104, and the hot water supply water outlet 106b of the third pipe 106 and the refrigerant inlet 104a of the second pipe 104 are formed in close proximity to each other. The hot water inlet 106a for the pipe 106 and the refrigerant outlet 104b for the second pipe 104 are formed in close proximity. Accordingly, the hot-water supply water flowing through the third pipe 106 and the refrigerant flowing through the second pipe 104 perform heat exchange in a section from the hot-water supply water inlet 106 a to the hot-water supply water outlet 106 b, that is, a section covering almost the entire length of the condenser 58. The hot water supply water flowing through the third pipe 106 and the refrigerant flowing through the second pipe 104 flow as counterflows.

  In general, hot water for hot water as low as tap water is stored in the lower part of the tank 10, so the temperature of hot water flowing into the condenser 58 from the tank water circulation path 20 is sufficiently low. On the other hand, the heating water after radiating heat at the low temperature heating terminal 78 or the high temperature heating terminal 76 includes residual heat, and the temperature of the heating water flowing into the condenser 58 from the second heating heating path 84 is not so low. is not. For this reason, if it is set as the structure which performs both the heat exchange between a refrigerant | coolant and hot water supply water, and the heat exchange between a refrigerant | coolant and heating water over the whole area of the condenser 58 like a prior art, the refrigerant | coolant exit 104b In the vicinity, heat transfer from the heating water, which is not so low, to the low-temperature refrigerant occurs, and the temperature of the refrigerant sent from the refrigerant outlet 104b to the expander 60 increases. When the temperature of the refrigerant sent from the refrigerant outlet 104b to the expander 60 becomes high, the COP of the heat pump 50 is lowered.

  Therefore, in the present embodiment, in the condenser 58, in the upstream portion as viewed from the flow of the refrigerant (the portion where the first pipe 102 is disposed inside the second pipe 104), between the refrigerant and the heating water. Both the heat exchange and the heat exchange between the refrigerant and the hot water supply water are performed, and in the downstream portion as viewed from the refrigerant flow (the portion where the first pipe 102 is not disposed inside the second pipe 104), the refrigerant Only heat exchange between the water and hot water supply water. By adopting such a configuration, heat transfer from the low-temperature heating water flowing into the condenser 58 from the second heating heating path 84 to the low-temperature refrigerant in the vicinity of the refrigerant outlet 104b is prevented, and the refrigerant outlet 104b The temperature of the refrigerant sent to the expander 60 can be sufficiently lowered. The COP of the heat pump 50 can be improved.

  FIG. 5 shows a Th diagram (Mollier diagram) of the heat pump 50 in the hot water supply and heating system 2 of the present embodiment. Moreover, FIG. 6 shows a case where both the heat exchange between the refrigerant and the water for heating and the heat exchange between the refrigerant and the water for hot water are performed over the entire section of the condenser 58 as in the prior art. The Th diagram of the heat pump 50 is shown. As shown in FIG. 6, in a configuration in which both heat exchange between the refrigerant and the heating water and heat exchange between the refrigerant and the hot water supply are performed over the entire section of the condenser 58, the vicinity of the refrigerant outlet (that is, In the vicinity of the heating water inlet), the temperature of the heating water becomes higher than the temperature of the refrigerant, heat transfer from the heating water to the refrigerant occurs, and the temperature of the refrigerant at the refrigerant outlet increases. On the other hand, as shown in FIG. 5, in the portion upstream from the refrigerant flow, both heat exchange between the refrigerant and the water for heating and heat exchange between the refrigerant and the water for hot water are performed. In the downstream portion as viewed from the flow of the refrigerant, when only the heat exchange between the refrigerant and the hot water supply water is performed, there is no region where the temperature of the heating water is higher than the temperature of the refrigerant. No heat transfer to. The temperature of the refrigerant at the refrigerant outlet can be lowered, and the COP of the heat pump 50 can be improved.

(Example 2)
The hot water supply / heating system 202 of the present embodiment has substantially the same configuration as the hot water supply / heating system 2 of the first embodiment. Below, only the point which is different from the hot-water supply heating system 2 of Example 1 is demonstrated.

  In the present embodiment, the condenser 58 of the heat pump 50 includes a first condenser 58a that is a three-fluid heat exchanger and a second condenser 58b that is a two-fluid heat exchanger. In the first condenser 58a, both heat exchange between the refrigerant and heating water and heat exchange between the refrigerant and hot water supply water are performed. In the second condenser 58b, only heat exchange between the refrigerant and the hot water supply water is performed. When viewed from the refrigerant flow, the first condenser 58a is arranged on the upstream side, and the second condenser 58b is arranged on the downstream side.

  Also in the hot water supply and heating system 202 of the present embodiment, heat transfer from the heating water that is not so low temperature flowing from the second heating heating path 84 to the condenser 58 is prevented from being transferred to the low-temperature refrigerant near the outlet of the condenser 58, The temperature of the refrigerant sent from the condenser 58 to the expander 60 can be sufficiently lowered. The COP of the heat pump 50 can be improved.

  As mentioned above, although the Example of this invention was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  For example, in the above-described embodiment, the configuration including the heating burner 82 for heating the heating water and the hot water supply burner 81 for heating the hot water supply water has been described. However, the heating burner 82 and the hot water supply burner 81 are provided. The heat pump 50 may be configured as a single heat source. Even in such a case, the COP of the heat pump 50 can be improved as compared with the prior art.

  The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

2 Hot water supply and heating system 4 Tank unit 6 Heat pump unit 8 Heat source unit 10 Tank 20 Tank water circulation path 22 Hot water circulation pump 24 Tap water introduction path 24a First introduction path 24b Second introduction path 30 Mixing valve 32 Tap water supply source 33 Heat source Machine bypass passage 34 Bypass valve 36 First hot water supply passage 37 Hot water supply heating passage 38 Hot water supply tap 39 Second hot water supply passage 40 Bath pouring passage 42 Pouring hot water solenoid valve 50 Heat pump 52 Refrigerant circulation passage 54 Evaporator 56 Fan 58 Condenser 58a First Heat exchanger 58b Second heat exchanger 60 Expander 62 Compressor 70 Systurn 72 Heating forward path 73 First heating heating path 74 Heating water circulation pump 75 Low temperature heating circuit 76 High temperature heating terminal 77 High temperature heating circuit 78 Low temperature heating terminal 79 Reheating circulation path 81 Hot water supply burner 82 Heating burner 83 Reheating thermal valve 84 Second warming Heating path 91 Bath water circulation path 96 Heating return path 97 Reheating heat exchanger 98 Bathtub 99 Bath water circulation pump 100 Controller 102 First pipe 102a Heating water inlet 102b Heating water outlet 104 Second pipe 104a Refrigerant inlet 104b Refrigerant outlet 106 Third pipe 106a Hot water inlet 106b Hot water outlet 202 Hot water heating system

Claims (5)

A compressor that pressurizes the refrigerant; a condenser that condenses the refrigerant by heat exchange between the heating medium and / or hot water supply water; an expander that depressurizes the refrigerant; and a heat pump that includes an evaporator that vaporizes the refrigerant. ,
A heater that circulates a heating medium between the condenser and the heating terminal;
It has a water heater that supplies hot water from a water supply source to a hot water supply location via a condenser,
In the condenser, the refrigerant and the heating medium flow as a counter flow, and the refrigerant and hot water supply water flow as a counter flow,
The condenser is more than a three-fluid heat exchanger that performs both heat exchange between the refrigerant and the heating medium, and heat exchange between the refrigerant and hot water, and a three-fluid heat exchanger as viewed from the refrigerant flow. A hot water supply / heating system including a two-fluid heat exchanger that performs only heat exchange between a refrigerant and hot water supply water on the downstream side. The condenser
A refrigerant pipe through which refrigerant flows,
A heating pipe that is formed to be shorter than the refrigerant pipe, and in which the heating medium flows,
It is formed to be almost the same length as the refrigerant pipe, and has a hot water supply pipe through which hot water is supplied.
A three-fluid heat exchanger is formed by the refrigerant pipe, the heating pipe, and the hot water supply pipe on the upstream side of the refrigerant pipe, and a two-fluid heat exchanger is formed by the refrigerant pipe and the hot water supply pipe on the downstream side of the refrigerant pipe. The hot water heating / heating system according to claim 1. It is arranged so that the heating pipe passes through the inside of the refrigerant pipe,
The hot water supply and heating system according to claim 2, wherein the hot water supply pipe is arranged so that the outer wall surface is in contact with the refrigerant pipe. A heat pump including a compressor that pressurizes the refrigerant, a condenser that condenses the refrigerant by heat exchange between the heating medium and / or hot water supply water, an expander that decompresses the refrigerant, and an evaporator that vaporizes the refrigerant. There,
In the condenser, the refrigerant and the heating medium flow as a counter flow, and the refrigerant and hot water supply water flow as a counter flow,
The condenser is more than a three-fluid heat exchanger that performs both heat exchange between the refrigerant and the heating medium, and heat exchange between the refrigerant and hot water, and a three-fluid heat exchanger as viewed from the refrigerant flow. A heat pump including a two-fluid heat exchanger that performs only heat exchange between the refrigerant and hot water supply water on the downstream side. A condenser that condenses the refrigerant of the heat pump by heat exchange with a heating medium and / or hot water supply water,
The refrigerant and the heating medium flow as a counter flow, and the refrigerant and hot water supply water flow as a counter flow,
A three-fluid heat exchanger that performs both heat exchange between the refrigerant and the heating medium, and heat exchange between the refrigerant and hot water, and downstream of the three-fluid heat exchanger as viewed from the refrigerant flow, A condenser including a two-fluid heat exchanger that performs only heat exchange between a refrigerant and hot water supply water.

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