JP6014435B2 - Three-fluid heat exchanger - Google Patents

Description

  The present invention relates to a three-fluid heat exchanger.

  Patent Document 1 discloses a three-fluid heat exchanger that exchanges heat between a heated fluid, a first heated fluid, and a second heated fluid. In this three-fluid heat exchanger, both the pipe through which the first heated fluid flows and the pipe through which the second heated fluid flow are arranged inside the pipe through which the heated fluid flows. By adopting such a configuration, both the heat transfer area between the heated fluid and the first heated fluid and the heat transfer area between the heated fluid and the second heated fluid can be secured large, respectively. High heating efficiency is realized.

JP 2003-65602 A

  When the first heated fluid or the second heated fluid is used as clean water, the occurrence of cross connection with the heated fluid becomes a problem. In the three-fluid heat exchanger of Patent Document 1, if the piping of the first heated fluid or the second heated fluid is damaged due to corrosion or the like, a cross connection is generated between the heated fluid and the first heated fluid or The heated fluid is mixed with the second heated fluid. Therefore, a three-fluid heat exchanger is expected that has good heating efficiency and can prevent the occurrence of cross connection.

  The present specification provides a technique for solving the above problems. The present specification provides a three-fluid heat exchanger that has good heating efficiency and can prevent occurrence of cross connection.

  The present specification discloses a three-fluid heat exchanger that exchanges heat between a heated fluid, a first heated fluid that is not used as clean water, and a second heated fluid that is used as clean water. The three-fluid heat exchanger is arranged such that the first channel, the second channel arranged so as to cover the periphery of the first channel, and the outer wall surface in contact with the outer wall surface of the second channel. A third flow path is provided, and the first heated fluid flows through the first flow path, the heated fluid flows through the second flow path, and the second heated fluid flows through the third flow path. .

  In the above three-fluid heat exchanger, the second flow path through which the heating fluid flows is disposed so as to cover the periphery of the first flow path through which the first heated fluid flows. Thereby, a large heat transfer area can be secured between the first heated fluid and the heated fluid, and the first heated fluid can be heated with high heating efficiency.

  In the above three-fluid heat exchanger, the third flow path in which the second heated fluid flows and the second flow path in which the heated fluid flows are arranged so that their outer wall surfaces are in contact with each other. As a result, even if one outer wall surface of the second flow path and the third flow path is damaged due to corrosion or the like, the other outer wall surface of the second flow path and the third flow path Mixing of the second heated fluid can be prevented. Generation | occurrence | production of the cross connection between the 2nd to-be-heated fluid utilized as clean water and a heating fluid can be prevented.

  In the above three-fluid heat exchanger, a heat pump cycle refrigerant can be used as the heating fluid. Moreover, in said three fluid heat exchanger, the water for a heating circulated between heating terminals can be used as a 1st to-be-heated fluid. In the above three-fluid heat exchanger, hot water supplied to the hot water tap can be used as the second heated fluid.

  The above three-fluid heat exchanger can be configured such that the third flow path is disposed vertically above the second flow path. When the heating fluid condenses while passing through the three-fluid heat exchanger, the heating fluid is in a state where the gas phase and the liquid phase are mixed inside the second flow path, and a liquid heating fluid is formed in the lower part of the second flow path. Flows, and a gaseous heating fluid flows in the upper part of the second flow path. In this case, the heating fluid not only dissipates sensible heat associated with a temperature drop but also dissipates latent heat associated with condensation. The condensed liquid film generated by the latent heat radiation inside the second flow path is unevenly distributed in the lower part of the second flow path due to gravity and the surface tension of the liquid film, and the condensed liquid film on the upper part of the second flow path becomes extremely thin. In the above three-fluid heat exchanger, since the third flow path is arranged vertically above the second flow path, the second heated fluid flowing in the third flow path and the gas flowing in the upper part of the second flow path The condensate film that becomes thermal resistance between the heated fluids is drained and thinned, and the surface temperature of the condensate film is lowered to a temperature close to that of the second heated fluid, thereby improving the heating efficiency of the second heated fluid. be able to.

  The above three-fluid heat exchanger can be configured such that the center of the first flow path is arranged to be vertically offset from the center of the second flow path. When the heating fluid condenses while passing through the three-fluid heat exchanger, the heating fluid is in a state where the gas phase and the liquid phase are mixed inside the second flow path, and a liquid heating fluid is formed in the lower part of the second flow path. Flows, and a gaseous heating fluid flows in the upper part of the second flow path. In this case, the heating fluid not only dissipates the sensible heat accompanying the temperature drop but also dissipates the latent heat accompanying the condensation, so the heating efficiency increases as the heat transfer area with the gaseous heating fluid increases. improves. In the above three-fluid heat exchanger, since the center of the first flow path is arranged to be vertically offset from the center of the second flow path, the first heated fluid flowing through the first flow path, A large heat transfer area can be secured between the gaseous heating fluids flowing in the upper part of the two flow paths. The heating efficiency of the first heated fluid can be improved.

It is a figure which shows typically the structure of the hot-water supply heating system 2 incorporating the three-fluid heat exchanger 58 of an Example. It is a perspective view which shows the external appearance of the three-fluid heat exchanger 58 of an Example. It is a cross-sectional view about the AA cross section of FIG. It is a transverse cross section about an AA section of Drawing 2 about three fluid heat exchanger 58 of a modification. FIG. 3 is a cross-sectional view of the AA cross section of FIG. 2 when a gaseous refrigerant flows in the upper part of the second pipe 104 and a liquid refrigerant flows in the lower part of the second pipe 104.

(Example)
FIG. 1 shows a hot water supply / heating system 2 in which the three-fluid heat exchanger 58 of the present embodiment is incorporated. The hot water supply / heating system 2 includes a tank unit 4, a heat pump unit 6, a heat source unit 8, 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 air heat exchanger (evaporator) 54, a fan 56, a compressor 62, This is a heat pump cycle including a three-fluid heat exchanger 58 and an expansion valve 60.

  The air heat exchanger 54 exchanges heat between the outside air blown by the fan 56 and the refrigerant in the refrigerant circulation path 52. The air heat exchanger 54 is supplied with refrigerant in a low-pressure and low-temperature liquid state after passing through the expansion valve 60. The air heat exchanger 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 air heat exchanger 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 compressed by the compressor 62, the refrigerant becomes a high-temperature and high-pressure gas state. The compressor 62 sends the compressed high-temperature and high-pressure gaseous refrigerant to the three-fluid heat exchanger 58.

  The three-fluid heat exchanger 58 is supplied with a high-temperature and high-pressure gaseous refrigerant sent from the compressor 62. The three-fluid heat exchanger 58 can perform heat exchange between the refrigerant in the refrigerant circuit 52 and water in the tank water circuit 20 described later (hereinafter also referred to as hot water supply water). Furthermore, the three-fluid heat exchanger 58 can perform heat exchange 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 heat exchange in the three-fluid heat exchanger 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 expansion valve 60 is supplied with a relatively low-temperature and high-pressure liquid refrigerant after passing through the three-fluid heat exchanger 58. The refrigerant is depressurized by passing through the expansion valve 60 and becomes a low-temperature and low-pressure liquid state. The refrigerant that has passed through the expansion valve 60 is sent to the air heat exchanger 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 air heat exchanger 54, the compressor 62, the three-fluid heat exchanger 58, and the expansion valve 60. In this case, in the three-fluid heat exchanger 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 three-fluid heat exchanger 58 of the heat pump unit 6, and 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 three-fluid heat exchanger 58 and heated. Return to the top of the. 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 outside the hot water supply / 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. A downstream end of the second hot water supply passage 39 is connected to a hot water tap 38.

  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 therein. 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 heater 78 is attached to the low temperature heating circuit 75. The low temperature heater 78 of the present embodiment is, for example, a floor heater. The low temperature heater 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 heater 76 is attached to the high temperature heating circuit 77. The high temperature heater 76 of the present embodiment is, for example, a bathroom heater / dryer. The high temperature heater 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 three-fluid heat exchanger 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 air heat exchanger 54, the compressor 62, the three-fluid heat exchanger 58, and the expansion valve 60. In this case, the refrigerant in the refrigerant circuit 52 passing through the three-fluid heat exchanger 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 heated by the heat of the refrigerant in the refrigerant circulation path 52 when the introduced hot water supply water passes through the three-fluid heat exchanger 58. Then, the heated hot water supply 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 heater 78 or the high-temperature heater 76 using the high-temperature heating water. 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 three-fluid heat exchanger 58 is supplied to the low-temperature heater 78 and the high-temperature heater 76 via the cistern 70. Furthermore, the control apparatus 100 operates the heating burner 82 as necessary. As a result, the high-temperature heater 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 heater 78 becomes the low temperature heating set temperature, and the temperature of the heating water supplied to the high temperature heater 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 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 amount of water supplied to the bathtub 98 reaches the hot water setting 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, heating water is heated by the heating burner 82.

(Configuration of three-fluid heat exchanger)
As shown in FIGS. 2 and 3, the three-fluid heat exchanger 58 mainly includes a first tube 102, a second tube 104, and a third tube 106. As shown in FIG. 2, the three-fluid heat exchanger 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. The third pipe 106 is constituted by a pipe having substantially the same diameter as the first pipe 102. The second tube 104 and the third tube 106 are brazed to each other with the outer wall surfaces in contact with each other. The third tube 106 is disposed vertically above the second tube 104.

  In the three-fluid heat exchanger 58 of the present embodiment, heating water in the second heating heating path 84 flows through the first pipe 102, refrigerant in the refrigerant circulation path 52 flows through the second pipe 104, and flows into the third pipe 106. The hot water supply water of the tank water circulation path 20 flows. The heating water circulates between the low temperature heater 78 and the high temperature heater 76 and is not used as clean water. The hot water supply water is supplied to the hot water tap 38 and the bathtub 98 and used as clean water. 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. A hot water supply water inlet 106 a and a hot water supply water outlet 106 b are formed at the upstream end and the downstream end of the third pipe 106, respectively. As shown in FIG. 2, at one end of the three-fluid heat exchanger 58 (the upper right end in FIG. 2), a heating water inlet 102a of the first pipe 102, a refrigerant outlet 104b of the second pipe 104, The hot water inlet 106a for the third pipe 106 is formed. At the other end of the three-fluid heat exchanger 58 (lower right end in FIG. 2), the heating water outlet 102b of the first pipe 102, the refrigerant inlet 104a of the second pipe 104, and the third pipe 106 A hot water supply water outlet 106b is formed. Accordingly, in the three-fluid heat exchanger 58, the hot-water supply water flowing through the third pipe 106 and the refrigerant flowing through the second pipe 104 flow in opposite directions, and the heating water flowing through the first pipe 102 and the refrigerant flowing through the second pipe 104 Also flow as counterflows to each other.

  In the three-fluid heat exchanger 58 of the present embodiment, the flow path through which the refrigerant that is the heating fluid flows is disposed so as to cover the periphery of the flow path through which the heating water that is the heated fluid flows. By setting it as such a structure, a big heat-transfer area can be ensured between the water for heating and a refrigerant | coolant. Therefore, the heating efficiency of the water for heating by a refrigerant | coolant can be improved.

  In the three-fluid heat exchanger 58 of the present embodiment, the second pipe 104 that is the outer wall surface of the flow path through which the refrigerant that is the heating fluid flows and the third wall surface that is the outer wall surface of the flow path through which the hot water supply water that is the fluid to be heated flows. The tubes 106 are arranged so that their outer surfaces are in contact with each other. With such a configuration, even if one of the second pipe 104 and the third pipe 106 is damaged due to corrosion or the like, the other of the second pipe 104 and the third pipe 106 can Mixing with the refrigerant can be prevented. It is possible to prevent a cross connection from occurring between the hot water supply water used as clean water and the refrigerant. Therefore, high safety can be ensured.

  In the present embodiment, the refrigerant that is the heating fluid is condensed while passing through the three-fluid heat exchanger 58. Accordingly, the refrigerant is in a state where the gas phase and the liquid phase are mixed inside the second pipe 104, and as shown in FIG. 5A, the liquid refrigerant flows in the lower part of the second pipe 104, and the second pipe 104 A gaseous refrigerant flows in the upper part of 104. At this time, since the refrigerant dissipates not only the sensible heat accompanying the temperature decrease but also the latent heat accompanying the condensation, the heating efficiency is improved as the heat transfer area with the gaseous refrigerant is increased.

  In the three-fluid heat exchanger 58 of the present embodiment, the third pipe 106 is disposed vertically above the second pipe 104. With this configuration, the condensed liquid film generated inside the second pipe 104 is thinned in the vicinity of the circumscribed area of the third pipe 106. Therefore, the thermal resistance of the condensate film is reduced, and the heating efficiency of hot water for water flowing through the third pipe 106 can be improved.

  As shown in FIG. 4, the first tube 102 and the second tube 104 may be arranged so that the center of the first tube 102 is offset upward with respect to the center of the second tube 104. As shown in FIG. 5B, when the center of the first tube 102 is offset upward with respect to the center of the second tube 104, the gaseous refrigerant flowing in the upper part of the second tube 104 and the second A large heat transfer area can be ensured between the heating water flowing through one pipe 102. Therefore, the heating efficiency of the heating water flowing through the first pipe 102 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.

  In the above embodiment, the case where the three-fluid heat exchanger 58 is configured by the three heat transfer tubes of the first tube 102, the second tube 104, and the third tube 106 has been described. As long as the flow path of the first heated fluid and the flow path of the second heated fluid are formed, the invention of the present application can be applied to any kind of heat exchanger.

  In the above embodiment, the configuration in which the three-fluid heat exchanger 58 is spirally wound has been described. However, the three-fluid heat exchanger 58 may be formed in any overall shape, for example, It may be formed by being wound in a spiral.

  In the above-described embodiment, the hot-water supply water flowing through the third pipe 106 and the refrigerant flowing through the second pipe 104 flow as counterflows, and the heating water flowing through the first pipe 102 and the refrigerant flowing through the second pipe 104 also flow countercurrently. However, the heating water flowing through the first pipe 102, the refrigerant flowing through the second pipe 104, and the hot water supply water flowing through the third pipe 106 may flow in parallel with each other.

  In the above-described embodiment, the case where the refrigerant of the heat pump 50 is used as the heating fluid has been described. However, for example, a refrigerant that recovers exhaust heat from the power generation device may be used as the heating fluid.

  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 path 34 Bypass valve 36 First hot water path 37 Hot water heating path 38 Hot water tap 39 Second hot water path 40 Bath pouring path 42 Pouring hot water solenoid valve 50 Heat pump 52 Refrigerant circulation path 54 Air heat exchanger 56 Fan 58 Three-fluid heat Exchanger 60 Expansion valve 62 Compressor 70 Systern 72 Heating forward path 73 First heating heating path 74 Heating water circulation pump 75 Low-temperature heating circulation path 76 High-temperature heating circuit 77 High-temperature heating circulation path 78 Low-temperature heating circuit 79 Reheating circulation path 81 For hot water supply Burner 82 Heating burner 83 Reheating heat valve 84 Second heating heating path 91 Bath water circulation path 9 Heating return path 97 Reheating heat exchanger 98 Bathtub 99 Bathtub 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 supply water inlet 106b Hot water supply water Exit

Claims (6)

A three-fluid heat exchanger that exchanges heat between a heated fluid, a first heated fluid that is not used as clean water, and a second heated fluid that is used as clean water,
A first flow path;
A second flow path arranged to cover the periphery of the first flow path;
A third channel disposed so that the outer wall surface is in contact with the outer wall surface of the second channel;
A three-fluid heat exchanger configured such that the first heated fluid flows in the first flow path, the heated fluid flows in the second flow path, and the second heated fluid flows in the third flow path.   The three-fluid heat exchanger according to claim 1, wherein the heating fluid is a refrigerant of a heat pump cycle.   The three-fluid heat exchanger according to claim 1, wherein the first heated fluid is heating water that circulates with a heating terminal.   The three-fluid heat exchanger according to claim 1, wherein the second heated fluid is hot water supplied to a hot water tap.   The three-fluid heat exchanger according to claim 1, wherein the third flow path is disposed vertically above the second flow path.   The three-fluid heat exchanger according to claim 1, wherein the center of the first flow path is arranged to be vertically offset from the center of the second flow path.

Images