KR101545084B1 - Hot water supply heating system, heat pump and condensor - Google Patents

Abstract

The problem to be solved provides a technique capable of operating a heat pump with high COP in a hot water supply heating system carrying out heating and hot water supply by using the heat pump. According to a solution of the specifications, disclosed is hot water supply heating system which comprises: a heat pump having a compressor, a condenser condensing refrigerant by heat exchange between fruit for heating and / or hot water supply water, an inflator, and an evaporator; a heater circulating fruit for heating between the condenser and a heating terminal; and a hot water supply machine supplying hot water supply water to a hot water supply place via a condenser from a water supply source. With respect to the condenser, refrigerant and fruit for heating flow as counter flow. Moreover, refrigerant and hot water supply water flow as counter flow. The condenser comprises: a third fluid heat exchanger carrying out both heat exchange between refrigerant and fruit for heating and heat exchange between refrigerant and hot water supply water; and a second fluid heat exchanger carrying out only heat exchange between refrigerant and hot water supply water in a lower stream than that of the third fluid heat exchanger as flow of refrigerant.

Description

[0001] HOT WATER SUPPLY HEATING SYSTEM [0002] HEAT PUMP AND CONDENSOR [

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

Patent Document 1 discloses a heat pump comprising a compressor for pressurizing a refrigerant, a condenser for condensing the refrigerant by heat exchange between the bath water and / or hot water, an expander for decompressing the refrigerant, and an evaporator for vaporizing the refrigerant, A reheating heater for circulating the water between the condenser and the bathtub and a hot water heater for supplying the hot water from the water source to the hot water spot via the condenser. According to the bathtub hot water supply system, both the hot water supply to the hot water supply location and the reheating of the bathtub can be performed by using the heating by the heat pump with high energy efficiency.

Patent Document 1: JP-A-2003-65602

There is a case where both the heating in the heating terminal and the hot water supply to the hot water supply place are desired to be performed by using the heating by the heat pump. In the technique of Patent Document 1, if the heating water (heat medium) is circulated between the condenser and the heating terminal instead of circulating the bath water between the condenser and the bathtub, heating by the heat pump is used Both the heating in the heating terminal and the hot water supply to the hot water supply point can be performed. However, with such a configuration, the following problems arise.

Generally, the temperature of the hot water supplied from the water source to the condenser is sufficiently low, but the heating heat returned from the heating terminal to the condenser contains residual heat, and is not so low. Thus, in the above-described configuration, heat is transferred from the heating oil, which is not so low in temperature, returned to the condenser from the heating terminal to the low-temperature refrigerant in the vicinity of the outlet of the condenser, and the temperature of the refrigerant sent from the condenser to the expander . When the temperature of the refrigerant sent from the condenser to the expander is increased, the COP of the heat pump is lowered.

The present specification provides techniques 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 heating system that performs heating and hot water using a heat pump.

The hot water heating system disclosed in this specification includes a compressor for pressurizing a refrigerant, a condenser for condensing the refrigerant by heat exchange between the heat for heating and / or water for hot water, an inflator for decompressing the refrigerant, and an evaporator for vaporizing the refrigerant A heater for circulating heating energy between the condenser and the heating terminal and a hot water heater for supplying hot water from the water source to the hot water spot via the condenser. In the hot water heating system, the refrigerant and the heating heat flow as a counter flow in the condenser, and the refrigerant and the hot water flow as a counter flow. In the hot water heating system, the condenser has a three-fluid heat exchanger that performs heat exchange between the refrigerant and the heat for heating, and heat exchange between the refrigerant and the hot water, and a three-fluid heat exchanger And a two-fluid heat exchanger for performing heat exchange only between the two heat exchangers.

In the above-described hot water heating system, in the three-fluid heat exchanger on the upstream side in the refrigerant flow in the condenser, both heat exchange between the refrigerant and the heating heat and heat exchange between the refrigerant and the hot water are performed, In the two-fluid heat exchanger on the downstream side, only heat exchange is performed between the refrigerant and the hot water. With this configuration, it is possible to prevent the heat from being transferred from the heating terminal to the condenser to the low-temperature refrigerant in the vicinity of the outlet of the condenser from the heat for heating, which is not so low, and to sufficiently lower the temperature of the refrigerant sent from the condenser to the expander can do. The COP of the heat pump can be improved.

In the hot water heating system, the condenser includes a refrigerant pipe through which a refrigerant flows, a heating pipe through which heating energy flows, and a refrigerant pipe which is formed to have a length shorter than that of the refrigerant pipe. A three-fluid heat exchanger is formed on the upstream side of the refrigerant pipe by a refrigerant pipe, a heating pipe, and a hot water pipe. On the downstream side of the refrigerant pipe, a refrigerant pipe and a hot- A fluid heat exchanger may be formed.

According to the hot water heating system, it is possible to realize a condenser having a three-fluid heat exchanger and a two-fluid heat exchanger with a simple structure and a small number of parts.

In the hot water heating system, the heating pipe may be arranged to pass through the inside of the refrigerant pipe, and the hot water pipe may be disposed so as to be in contact with the outer wall face of the refrigerant pipe.

In the hot water heating system, a large heat transfer area can be ensured between the refrigerant and the heating heat. In addition, in the hot water heating system, even when a loss is caused by corrosion or the like on the outer wall surface of one side of the refrigerant pipe and the hot water supply pipe, the outer wall surface of the other shaft of the refrigerant pipe and the hot water supply pipe prevents mixing of the refrigerant and hot water . It is possible to prevent the occurrence of cross connection between the refrigerant and the water for hot water supply.

The present disclosure also discloses a heat pump. The heat pump includes a compressor for pressurizing the refrigerant, a condenser for condensing the refrigerant by heat exchange between the heat for heating and / or hot water, an expander for reducing the pressure of the refrigerant, and an evaporator for evaporating the refrigerant. In the heat pump, the refrigerant and the heating heat flow as a counter flow in the condenser, and the refrigerant and the hot water flow as a counter flow. The heat pump includes a three-fluid heat exchanger in which the condenser performs heat exchange between the refrigerant and the heating fluid, and heat exchange between the refrigerant and the hot water, and a three-fluid heat exchanger between the refrigerant and the hot water And a two-fluid heat exchanger that performs only heat exchange with the heat exchanger.

The present disclosure also discloses a condenser. The condenser condenses the refrigerant of the heat pump by heat exchange between the heat for heating and / or water for hot water supply. In the above-described condenser, the refrigerant and the heating heat flow as a counter flow, and the refrigerant and the hot water flow as a counter flow. The condenser includes a three-fluid heat exchanger for performing both heat exchange between the refrigerant and the heating fluid, heat exchange between the refrigerant and the hot water, and heat exchange between the refrigerant and the hot water at the downstream side of the three- And a two-fluid heat exchanger to be operated.

Fig. 1 is a diagram schematically showing a configuration of a hot water heating system 2 according to Embodiment 1. Fig.
2 is a perspective view showing the appearance of the condenser 58 of the first embodiment.
3 is a longitudinal sectional view taken along line AA in Fig.
4 is a longitudinal sectional view of the BB section of Fig.
5 is a Th diagram of the heat pump 50 of the first embodiment.
6 is a Th diagram of a heat pump 50 of the prior art.
7 is a diagram schematically showing a configuration of a hot water heating system 202 according to the second embodiment.

(Example 1)

Fig. 1 shows a hot water heating system 2 of the present embodiment. The hot water 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, HFC refrigerant referred to as R410A or CO ₂ refrigerant referred to as R744), an evaporator 54, a fan 56, a compressor 62, a condenser 58, and an expander 60. In the heat pump cycle,

The evaporator 54 exchanges heat between the outside air blown by the fan 56 and the refrigerant in the refrigerant circulation path 52. The refrigerant in the low-pressure low-temperature liquid state after passing through the expander 60 is supplied to the evaporator 54. The evaporator 54 heats the refrigerant by exchanging heat between the refrigerant and the outside air. The refrigerant vaporizes by being heated, and becomes a gas state of relatively high temperature and 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 relatively high-temperature and low-pressure gaseous refrigerant. The refrigerant is pressurized by the compressor (62), so that the refrigerant becomes a gas state of high temperature and high pressure. The compressor (62) delivers the gaseous refrigerant at a high temperature and pressure after the pressurization to the condenser (58).

The high-temperature, high-pressure gaseous refrigerant discharged from the compressor (62) is supplied to the condenser (58). The condenser 58 can perform heat exchange between the refrigerant in the refrigerant circulation path 52 and water (hereinafter also referred to as hot water supply water) in the tank water circulation path 20 described later. The condenser 58 can perform heat exchange between the refrigerant in the refrigerant circulation path 52 and water (hereinafter also referred to as heating water) in the second heating heating path 84 described later. As a result of the heat exchange in the condenser 58, the refrigerant is deprived of heat and condensed. As a result, the refrigerant is in a liquid state of relatively low temperature and high pressure.

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

In the heat pump 50, when the compressor 62 is operated, 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 the above case, in the condenser 58, the water for hot water in the tank water circuit 20 or the heating water in the second heating furnace 84 is heated.

The tank unit 4 is provided with a tank 10. The tank 10 stores the heated hot water by the heat pump 50. The water for hot water supply in this embodiment is tap water. The tank 10 is of a closed type and is covered on the outside by a heat insulating material. In the tank 10, water for hot water supply is stored up to full water.

The tank water circulation passage 20 has an upstream end connected to the lower portion of the tank 10 and a condenser 58 of the heat pump unit 6 and a downstream end connected to the upper portion of the tank 10. The hot water circulation pump 22 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 circulation pump 22, hot water for the hot water under the tank 10 is sent to the condenser 58 to be heated, Is returned to the top of the tank (10). Inside the tank 10, a temperature-resistant layer in which a high-temperature hot water layer is superposed on the low-temperature hot water layer is formed.

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

The first hot water supply path (36) has an upstream end connected to the upper portion of the tank (10). As described above, the second introduction path 24b of the tap water introduction path 24 is connected to the first hot water path 36 at the middle. A mixing valve 30 is opened at a connection portion between the first hot water supply path 36 and the second introduction path 24b. The mixing valve 30 controls the flow rate of hot water for hot water flowing into the first hot water path 36 from the upper portion of the tank 10 and the flow rate of hot water flowing from the second introduction path 24b to the first hot water path 36 To adjust the flow rate of tap water. The first hot water supply path 36 downstream of the connection with the second introduction path 24b is connected to the second hot water supply path 39 through the hot water heating path 37 of the heat source unit 8. The first hot water supply path (36) and the second hot water supply path (39) are connected by a heat source bypass path (33). A bypass valve 34 is opened in the heat source bypass path 33. [ The downstream end of the second hot water supply path 39 is connected to a hot water tap (hot water tap) (38, corresponding to hot water tapping).

The heat source unit 8 includes a cystone 70, a heating burner 82, and a hot water burner 81. The cistern 70 is a container which is open at the top, and stores heating water (corresponding to heating oil) therein. The heating water in this embodiment is, for example, an antifreeze. The upstream end of the heating forward path 72 is connected to the cen- tern 70. [ A heating water circulation pump 74 is opened in the heating path 72. When the heating water circulation pump 74 is driven, the heating water in the cistern 70 flows into the heating heat path 72.

The downstream end of the heating forward path 72 branches to the first heating heating path 73 and the low temperature heating circulation path 75. A low-temperature heating terminal 78 is mounted on the low-temperature heating circulation path 75. The low-temperature heating terminal 78 of this embodiment is, for example, a floor heater. The low temperature heating terminal 78 heats by using the heat of the supplied heating water. A heating burner 82 is opened in the first heating heating furnace 73. The heating burner 82 heats the heating water in the first heating heating furnace 73. The downstream end of the first heating heating furnace 73 is branched to the high-temperature heating circulation path 77 and the reheating circulation path 79. [ A high-temperature heating terminal 76 is mounted on the high-temperature heating circulation path 77. The high-temperature heating terminal 76 of this embodiment is, for example, a bathroom heating dryer. The high-temperature heating terminal 76 heats by using the heat of the supplied heating water. The low-temperature heating circulation path 75 and the high-temperature heating circulation path 77 join 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 is connected to the upstream end of the heating return path 96 through the condenser 58 of the heat pump unit 6. The downstream end of the heating return passage 96 is connected to the cistern 70 of the heat source unit 8.

A reheating heat valve 83 and a reheating heat exchanger 97 are opened in the reheating circulation path 79. The reheating thermo valve 83 opens and closes the reheating circulation path 79. In the reheating heat exchanger (97), heat exchange is performed between the water for heating flowing through the reheating circulation path (79) and the number of bathtubs flowing through the tub water circulation path (91). The downstream end of the reheating circulation path 79 is connected to the heating return path 96.

The upstream end of the bath water circulation path 91 is connected to the bottom of the bathtub 98. The downstream end of the bath water circulation path 91 is connected to the side of the bathtub 98. In the bath water circulation path 91, a bath water circulation pump 99 is opened. When the bath water circulation pump 99 is driven, the number of bathtubs sucked from the bottom of the bathtub 98 passes through the reheating heat exchanger 97 and is returned to the side of the bathtub 98.

In the hot water heating furnace 37, a hot water burner 81 is opened. The bathtub pouring path 40 is branched from the downstream side of the hot water supply burner 81 of the hot water heating furnace 37. A pouring solenoid valve 42 for opening and closing the bath pouring path 40 is opened in the tub pouring path 40. The downstream end of the bath pouring path 40 is connected to the bath 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 heating system 2 can perform heat accumulation operation, hot water operation, heating operation, bath water supply operation and reheating operation as follows.

(Heat storage operation)

In the heat storage operation, the hot water in the tank 10 is heated by the heat pump 50, and the hot water for hot water is returned to the tank 10. When the heat storage operation is performed, the control device 100 drives the compressor 62 and the fan 56 to operate the heat pump 50 and drives the hot water circulation pump 22.

The refrigerant in the refrigerant circulation path 52 is circulated in the order of the evaporator 54, the compressor 62, the condenser 58 and the inflator 60 by driving the compressor 62. In this case, the refrigerant in the refrigerant circulation path 52 passing through the condenser 58 is in a gas state of high temperature and high pressure. The hot water supply circulation pump 22 circulates hot water in the tank 10 through the tank water circulation passage 20. That is to say, the hot water supply water present in the lower portion of the tank 10 is introduced into the tank water circulation passage 20 and heated by the heat of the refrigerant in the refrigerant circulation path 52 when the introduced hot water supply water passes through the condenser 58, The hot water for hot water is returned to the upper portion of the tank 10. As a result, hot water for hot water is stored in the tank (10). When the inside of the tank 10 becomes a full state filled with hot water for hot water supply, the heat storage operation is ended.

(Hot water operation)

The hot water supply operation is an operation of supplying the hot water in the tank 10 to the hot water supply 38. The hot water supply operation may be performed in parallel with the above-described heat storage operation. Tap water flows into the lower portion of the tank 10 from the tap water introduction path 24 and the first introduction path 24a by the water pressure from the tap water supply source 32 when the hot water supply passage 38 is opened. At the same time, the hot water for the upper portion of the tank 10 is supplied to the hot water supply 38 through the first hot water 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 hot water setting temperature, the control device 100 drives the mixing valve 30 to discharge the hot water from the second introduction path 24b The tap water is introduced into the first hot water furnace 36. Therefore, the water for hot water supplied from the tank 10 and the tap water supplied from the second introduction path 24b are mixed in the first hot water supply path 36. The control device 100 adjusts the opening degree of the mixing valve 30 so that the temperature of the hot water supplied to the hot water supply 38 becomes equal to the hot water setting temperature. On the other hand, when the temperature of the hot water supply water supplied from the tank 10 to the first hot water supply path 36 is lower than the hot water setting temperature, the control device 100 controls the first hot water supply path 36 ) In the water. The control device 100 controls the output of the hot water burner 81 such that the temperature of hot water supplied to the hot water supply 38 is equal to the hot water setting temperature.

(Heating operation)

The heating operation is an operation in which the 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 by using the heating water of high temperature. When execution of the heating operation is instructed by the user, the controller 100 rotates the water circulation pump 74 for heating. In addition, the control device 100 drives the compressor 62. The heating water heated in the condenser 58 is supplied to the low temperature heating terminal 78 or the high temperature heating terminal 76 via the cistern 70. [ Further, the control device 100 operates the heating burner 82 as necessary. As a result, the heating water with higher temperature is supplied to the high-temperature heating terminal 76 by the heating by the heating burner 82. In the heating operation, the heating water supplied to the low temperature heating terminal 78 is set to the low temperature setting temperature, and the temperature of the heating water supplied to the high temperature heating terminal 76 is set to the high temperature heating set temperature. 50 and the output of the heating burner 82 are adjusted.

(Bath water supply operation)

The bath water supply operation is an operation of supplying the bath water to the bathtub 98. When the user instructs the start of the bath water supply operation, the hot water heating system 2 starts the bath water supply operation. In the bath water supply operation, the pouring solenoid valve 42 is opened. When the pouring solenoid valve 42 is opened, tap water flows into the lower portion of the tank 10 from the tap introduction path 24 and the first introduction path 24a by the water pressure from the tap water supply source 32. At the same time, the hot water for the upper portion of the tank 10 is supplied to the bathtub 98 through the first hot water bath 36, the hot water heating furnace 37, the bathtub pouring bath 40 and the bath water circulation path 91. In the bath water supply operation, the temperature of the water supplied to the tub pouring path 40 is adjusted to the bath water supply set temperature in the same manner as the hot water supply operation. When the flow rate of the water supplied to the bathtub 98 reaches the bath water supply set water quantity, the bath water supply operation is terminated.

(Reheating operation)

The reheating operation is an operation of reheating the number of bathtubs stored in the bathtub 98. When the user instructs the start of reheating operation, the hot water heating system 2 starts reheating operation. In the reheating operation, the bath water circulation pump 99 is driven. Further, the reheating heat valve 83 is opened to drive the water circulation pump 74 for heating. Thus, the bathtub water is drawn from the bottom of the bathtub 98 and heated by heat exchange with the water for heating in the reheating heat exchanger 97. The heated bath 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 the heating operation.

(Configuration of condenser)

As shown in Figs. 2, 3 and 4, the condenser 58 mainly comprises a first pipe 102, a second pipe 104, and a third pipe 106. The heating water for the second heating heating path 84 flows to the first pipe 102 and the refrigerant flows through the second pipe 104 to the refrigerant circulation path 52 while the third pipe 106 is connected to the tank water circulation path 20, Water flows. As shown in Fig. 2, the condenser 58 is formed by winding a combination of these pipes in a spiral shape.

As shown in Fig. 3, the first pipe 102 is composed of a small-diameter pipe, and the second pipe 104 is composed of a large-diameter pipe. The first pipe (102) is arranged to pass through the inside of the second pipe (104). In other words, a double pipe is formed by the first pipe 102 and the second pipe 104. 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 port 102a and a heating water outlet port 102b, respectively have. 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 tube 102 is formed to be shorter than the second tube 104 and the heating water outlet 102b of the first tube 102 and the refrigerant inlet 104a of the second tube 104 are formed at positions close to each other. The heating water inlet port 102a of the first pipe 102 and the refrigerant outlet port 104b of the second pipe 104 are formed apart from each other. 4, in a section between the heating water inlet 102a of the first pipe 102 and the refrigerant outlet 104b of the second pipe 104, a first pipe (not shown) is provided in the second pipe 104, 102 are not disposed. Therefore, the heating water flowing through the first pipe 102 and the refrigerant flowing through the second pipe 104 perform heat exchange only in the section from the heating water inlet port 102a to the heating water outlet port 102b. In this section, the heating water flowing through the first pipe 102 and the refrigerant flowing through the second pipe 104 flow as a counter flow.

As shown in FIG. 3, the third pipe 106 is composed of 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 soldered to each other in a state in which their outer wall surfaces are in contact with each other. As shown in Fig. 2, hot water supply water inlet 106a and hot water supply water outlet 106b are formed at the upstream end and the downstream end of the third pipe 106, respectively. The third tube 106 is formed to have substantially the same length as the second tube 104 and the hot water supply outlet 106b of the third tube 106 and the refrigerant inlet 104a of the second tube 104 are close to each other And the hot water supply water inlet 106a of the third pipe 106 and the refrigerant outlet 104b of the second pipe 104 are formed at the adjacent positions. Therefore, the hot water flowing through the third pipe 106 and the refrigerant flowing through the second pipe 104 flow from the hot water supply water inlet 106a to the hot water supply water outlet 106b, that is, almost the entire length of the condenser 58 The heat exchange is carried out in the section extending over the entire area. The hot water flowing through the third pipe 106 and the refrigerant flowing through the second pipe 104 flow as a counter flow.

Generally, the temperature of the hot water for cooling water flowing into the condenser 58 from the tank water circulation path 20 is sufficiently low because hot water for hot water is stored in the lower portion of the tank 10 at the same low temperature as tap water. On the other hand, the heating water after releasing heat from the low temperature heating terminal 78 or the high temperature heating terminal 76 contains 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 temperature. Therefore, if the heat exchanging operation is performed between the refrigerant and the hot water for the entire section of the condenser 58 and the heat exchange between the refrigerant and the heating water is performed as in the prior art, The heat is transferred from the heating water not so low in temperature to the low-temperature refrigerant, so that the temperature of the refrigerant sent from the refrigerant outlet 104b to the inflator 60 is raised. When the temperature of the refrigerant sent from the refrigerant outlet 104b to the inflator 60 increases, the COP of the heat pump 50 decreases.

Therefore, in this embodiment, in the condenser 58, in the portion upstream of the refrigerant (i.e., the portion in which the first pipe 102 is disposed in the second pipe 104), the refrigerant and the heating water (The portion where the first pipe 102 is not disposed in the inside of the second pipe 104) when viewed from the flow of the refrigerant, and the heat exchange between the refrigerant and the hot water for the hot water, Only the heat exchange between the refrigerant and the water for hot water supply is performed. With this configuration, it is possible to prevent the heat from flowing from the second heating heating furnace 84 to the condenser 58 to the low-temperature refrigerant in the vicinity of the refrigerant outlet 104b, The temperature of the refrigerant sent from the outlet 104b to the inflator 60 can be made sufficiently low. The COP of the heat pump 50 can be improved.

Fig. 5 shows a Th diagram (a diagram of a moly line) of the heat pump 50 in the hot water heating system 2 of the present embodiment. 6 is a schematic view showing the structure of a heat pump 50 in the case of a structure in which both the heat exchange between the refrigerant and the heating water and the heat exchange between the refrigerant and the hot water for the entire section of the condenser 58, ). As shown in Fig. 6, in the case where the heat exchanging between the refrigerant and the heating water and the heat exchange between the refrigerant and the hot water are performed over the entire section of the condenser 58, The temperature of the water for heating becomes higher than the temperature of the refrigerant, heat is transferred from the water for heating to the refrigerant, and the temperature of the refrigerant at the outlet of the refrigerant increases. On the other hand, as shown in Fig. 5, both the heat exchange between the refrigerant and the heating water and the heat exchange between the refrigerant and the hot water are performed on the upstream side in the flow of the refrigerant, There is no region in which the temperature of the water for heating becomes higher than the temperature of the refrigerant, so that the heat does not move from the heating water to the refrigerant. 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 heating system 202 of this embodiment has substantially the same configuration as the hot water heating system 2 of the first embodiment. Only the points that are different from the hot water heating system 2 of the first embodiment will be described below.

In this embodiment, the condenser 58 of the heat pump 50 is constituted by a first condenser 58a which is a three-fluid heat exchanger and a second condenser 58b which is a two-fluid heat exchanger. In the first condenser (58a), both heat exchange between the refrigerant and the heating water and heat exchange between the refrigerant and the hot water are effected. In the second condenser (58b), heat exchange is performed only between the refrigerant and the water for hot water supply. A first condenser (58a) is disposed on the upstream side and a second condenser (58b) is disposed on the downstream side in view of the flow of the refrigerant.

In the hot water heating system 202 of this embodiment as well, the heat is transferred from the non-low temperature heating water flowing into the condenser 58 from the second heating heating path 84 to the low temperature refrigerant near the outlet of the condenser 58 And the temperature of the refrigerant sent from the condenser 58 to the inflator 60 can be made sufficiently low. The COP of the heat pump 50 can be improved.

The embodiments of the present invention have been described in detail above, but these are merely examples and do not limit the claims. The techniques described in the claims include various modifications and changes to the embodiments described above.

For example, in the above embodiment, the heating burner 82 for heating the heating water and the hot water burner 81 for heating the hot water are described. However, the heating burner 82, The heat pump 50 without the burner 81 may be 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 are intended to exhibit technical usefulness alone or in various combinations and are not limited to combinations of claims described in the application. The technology described in the present specification or drawings can achieve a plurality of objectives at the same time, and achieving one of the objectives itself has technological usefulness.

2: Hot water heating system 4: Tank unit
6: Heat pump unit 8: Heat source unit
10: tank 20: tank water circulation path
22: hot water circulating water circulation pump 24: tap water introduction path
24a: first introduction route 24b: second introduction route
30: Mixing valve 32: Tap water supply source
33: heat source bypass path 34: bypass valve
36: first hot water bath 37: hot water heating furnace
38: Hot water supply 39: Second hot water supply
40: bathtub with pouring tube 42: pouring solenoid valve
50: heat pump 52: refrigerant circulation path
54: Evaporator 56: Fan
58: condenser 58a: first heat exchanger
58b: second heat exchanger 60: inflator
62: compressor 70:
72: heating circuit 73: first heating heating furnace
74: Heating water circulation pump 75: Low temperature heating circulation path
76: high temperature heating terminal 77: high temperature heating circulation path
78: low temperature heating terminal 79: reheating circulation path
81: Burner for hot water supply 82: Burner for heating
83: Reheating heat valve 84: Second heating heating furnace
91: Bathtub water circulation pathway 96:
97: Reheat heat exchanger 98: Bathtub
99: bath water circulation pump 100: control device
102: First tube 102a: Heating water inlet
102b: Heating water outlet 104:
104a: Refrigerant inlet 104b: Refrigerant outlet
106: the third pipe 106a: the inlet of the hot water supply water
106b: hot water outlet 202: hot water heating system

Claims (5)

A heat pump including a compressor for pressurizing the refrigerant, a condenser for condensing the refrigerant by heat exchange between the heat for heating and / or water for hot water supply, an expander for decompressing the refrigerant, and an evaporator for evaporating the refrigerant,
A heater for circulating heating energy between the condenser and the heating terminal,
And a hot water supply unit for supplying the hot water supply water from the water supply source to the hot water supply place via the condenser,
In the condenser, the refrigerant and the heating heat flow as countercurrents, and the refrigerant and the hot water flow as countercurrents,
A three-fluid heat exchanger in which the condenser performs heat exchange between the refrigerant and the heating oil, heat exchange between the refrigerant and the hot water, and heat exchange between the refrigerant and the hot water in the downstream side of the three fluid heat exchanger And a two-fluid heat exchanger for heating the hot water.
The method according to claim 1,
The condenser,
A refrigerant pipe in which a refrigerant flows,
A heating pipe which is formed to have a length shorter than the refrigerant pipe and in which heating energy flows,
And a hot water supply pipe through which the hot water flows,
Wherein a three-fluid heat exchanger is formed on the upstream side of the refrigerant pipe by a refrigerant pipe, a heating pipe and a hot water supply pipe, and a two-fluid heat exchanger is formed on the downstream side of the refrigerant pipe by a refrigerant pipe and a hot water supply pipe. system.
The method of claim 2,
The heating pipe is disposed so as to pass through the inside of the refrigerant pipe,
Wherein the hot water supply pipe is disposed so that its outer wall surface is in contact with the refrigerant pipe.
A heat pump comprising: a compressor for pressurizing a refrigerant; a condenser for condensing the refrigerant by heat exchange between the heat for heating and / or water for hot water; an inflator for decompressing the refrigerant; and an evaporator for vaporizing the refrigerant,
In the condenser, the refrigerant and the heating heat flow as countercurrents, and the refrigerant and the hot water flow as countercurrents,
A three-fluid heat exchanger in which the condenser performs heat exchange between the refrigerant and the heating oil, heat exchange between the refrigerant and the hot water, and heat exchange between the refrigerant and the hot water in the downstream side of the three fluid heat exchanger And a two-fluid heat exchanger for supplying heat to the heat exchanger.
A condenser for condensing a refrigerant of a heat pump by heat exchange between heating water and / or water for hot water supply,
The refrigerant and the heat for heating flow as a counter flow, the refrigerant and the hot water flow as a counter current,
A three-fluid heat exchanger that performs both heat exchange between the refrigerant and the heating fluid, heat exchange between the refrigerant and the hot water, and heat exchange between the refrigerant and the hot water at the downstream side of the three fluid heat exchanger And a fluid heat exchanger.

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