JP5404541B2 - Heat exchanger and hot water supply apparatus provided with the same - Google Patents

Description

  The present invention relates to a heat exchanger and a hot water supply apparatus including the heat exchanger.

There is a heat exchanger that performs heat exchange between a refrigerant that circulates in a refrigerant circuit that uses a heat pump cycle as a heat source, a heat medium that is circulated in a floor heating circuit, and water that is supplied to a hot water supply circuit.
In the conventional heat exchanger, the pipe diameter of the heat exchanger pipe is changed according to the flow rate of the heat medium. That is, when a large amount of hot water is required for the floor heating circuit, the pipe diameter of the hot water supply circuit is reduced so that the temperature of the water flowing through the hot water supply circuit is higher than the temperature of the heat medium flowing through the floor heating circuit. The amount of heat required for floor heating was compensated by transferring heat to the heating circuit (see, for example, Patent Document 1).

JP 2009-243747 A (paragraph [0004], FIG. 3)

  In a heat exchanger that performs heat exchange between a plurality of heat media, it is desired that the amount of heat exchange can be adjusted for each heat medium.

  In the heat exchanger described in Patent Document 1, the temperature of a part of the heat medium is increased by changing the pipe diameter of the heat exchanger pipe. However, in the heat exchanger as described in Patent Document 1, since the pipe diameter of the floor heating circuit is larger than the pipe diameters of the hot water supply circuit and the refrigerant circuit, the surface area other than the portion related to the heat transfer portion between the pipes is large. Become. For this reason, there existed a problem that the thermal radiation loss from piping for floor heating circuits increased.

The present invention has been made in order to solve the above-described problems. A heat exchanger capable of performing heat exchange between a plurality of heat media and adjusting a heat exchange amount for each heat medium, and a hot water supply apparatus including the heat exchanger Is what you get.
Moreover, the heat exchanger with little heat dissipation loss by piping of a heat exchanger and a hot water supply apparatus provided with the same are obtained.

  The heat exchanger according to the present invention includes a first flow path through which a first heat medium serving as a heat source flows, and a second flow path disposed adjacent to the first flow path and through which a second heat medium flows. And a third channel that is arranged adjacent to the first channel and through which a third heat medium flows, the second channel, the first channel, and the third channel The third flow path is stacked in order, and a plurality of first stacked portions that perform heat exchange between the second heat medium and the third heat medium and the first heat medium are stacked. Any one of the second flow path or the third flow path and the first flow path are laminated in order, and either the second heat medium or the third heat medium A second laminated part in which one side and the first heat medium exchange heat is laminated on the first laminated part.

  In the present invention, the second flow path, the first flow path, and the third flow path are laminated in order, and the second heat medium, the third heat medium, and the first heat medium are A plurality of first laminated portions that perform heat exchange are laminated, and either the second flow path or the third flow path and the first flow path are laminated in order, and the second heat medium Alternatively, the second stacked portion in which any one of the third heat medium and the first heat medium exchange heat is stacked on the first stacked portion. For this reason, heat exchange can be performed between a plurality of heat media, and the amount of heat exchange can be adjusted for each heat medium.

It is a figure which shows the principal part of the hot water supply apparatus provided with the heat exchanger by Embodiment 1 of this invention. It is a figure which shows typically the piping structure of the heat exchanger by Embodiment 1 of this invention. It is a figure which shows the piping cross section of the heat exchanger by Embodiment 1 of this invention. It is a figure which shows the one end part of the header of the heat exchanger by Embodiment 1 of this invention. It is a figure which shows typically the other example of the piping structure of a heat exchanger. It is a figure which shows the piping cross section of the heat exchanger by Embodiment 2 of this invention. It is an operation | movement figure of the hot water supply apparatus provided with the heat exchanger by Embodiment 3 of this invention. It is an operation | movement figure of the hot water supply apparatus provided with the heat exchanger by Embodiment 3 of this invention. It is an operation | movement figure of the hot water supply apparatus provided with the heat exchanger by Embodiment 3 of this invention. It is an operation | movement figure of the hot water supply apparatus provided with the heat exchanger by Embodiment 3 of this invention. It is an operation | movement figure of the hot water supply apparatus provided with the heat exchanger by Embodiment 3 of this invention. It is an operation | movement figure of the hot water supply apparatus provided with the heat exchanger by Embodiment 3 of this invention. It is an operation | movement figure of the hot water supply apparatus provided with the heat exchanger by Embodiment 3 of this invention.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a main part of a hot water supply apparatus including a heat exchanger according to Embodiment 1 of the present invention.
As shown in FIG. 1, the hot water supply apparatus includes a refrigerant circuit 1, a hot water supply circuit 9, and a bath circuit 12.
The refrigerant circuit 1 connects the compressor 2, the heat exchanger 3 that operates as a condenser, the expansion valve 4, and the evaporator 5 in an annular manner to circulate the refrigerant. The compressor 2 sucks refrigerant and compresses the refrigerant to a high temperature and high pressure state. For example, the compressor 2 may be configured by an inverter compressor capable of capacity control. The heat exchanger 3 exchanges heat between the refrigerant circulating in the refrigerant circuit 1 and at least one of water for hot water (described later) circulating in the hot water supply circuit 9 and water for bathtub (described later) circulating in the bath circuit 12. Is what you do. The heat exchanger 3 functions as a condenser and condenses and liquefies the refrigerant. Details of the heat exchanger 3 will be described later. The expansion valve 4 decompresses the refrigerant to expand it. The expansion valve 4 is preferably constituted by a valve whose opening degree can be variably controlled, for example, an electronic expansion valve. The evaporator 5 exchanges heat between the air supplied from the fan 6 and the refrigerant to evaporate the refrigerant.
The “refrigerant circuit 1” corresponds to the “heat pump cycle” in the present invention.

The hot water supply circuit 9 connects the hot water supply tank 7, the heat exchanger 3, and the hot water supply pump 8 in an annular shape, circulates water for hot water supply, and stores it in the hot water supply tank 7. The hot water supply tank 7 stores water for hot water supply. The hot water supply pump 8 circulates the water flowing through the piping of the hot water supply circuit 9. The hot water supply pump 8 is preferably constituted by a pump whose capacity can be controlled, for example.
The hot water supply circuit 9 circulates the low temperature water flowing out from the lower part of the hot water tank 7 by the hot water supply pump 8, and stores the high temperature water that has been absorbed by the heat exchanger 3 from the upper part of the hot water tank 7. To do. In addition, a water supply 14 for supplying, for example, tap water is provided below the hot water supply tank 7. Furthermore, a faucet 13 is provided that can flow out by mixing the water flowing through the heat exchanger 3 with the hot water stored in the hot water tank 7. Moreover, the hot water supplied from the faucet 13 is mixed with, for example, tap water 14 for supplying tap water, and flows out warm water having an appropriate temperature. Hot water from the faucet 13 can supply hot water to the hot water in the bathtub 10.
The “faucet 13” corresponds to the “hot water inlet” in the present invention.

The bath circuit 12 connects the heat exchanger 3 and the bath pump 11 in a ring shape, and circulates water for the bathtub. The bath pump 11 circulates the water flowing through the piping of the bath circuit 12. The bath pump 11 is preferably constituted by a pump whose capacity can be controlled, for example. In the bath circuit 12, hot water (tub water) stored in the bathtub 10 is circulated from the lower part of the bathtub 10 by the bath pump 11, and the bathtub water that has been heated by the heat exchanger 3 is heated again. By returning to 10, it is possible to catch up.
The “bath circuit 12” corresponds to the “heat utilization circuit” in the present invention.
The “bath pump 11” corresponds to the “circulation pump” in the present invention.

The heat exchanger 3 includes a refrigerant pipe 1 ′ through which the refrigerant of the refrigerant circuit 1 flows, a hot water supply pipe 9 ′ through which hot water for the hot water supply circuit 9 flows, and a bath pipe 12 through which the water in the bathtub of the bath circuit 12 flows. 'And features. The heat exchanger 3 is capable of heat exchange between the refrigerant serving as the heat source and the water for hot water supply and the heat exchange between the refrigerant serving as the heat source and the water for the bathtub.
The “refrigerant pipe 1 ′” corresponds to the “first flow path” in the present invention.
“Hot water supply pipe 9 ′” corresponds to “second flow path” in the present invention.
The “bath pipe 12 ′” corresponds to the “third flow path” in the present invention.
The “refrigerant” corresponds to the “first heat medium” in the present invention.
The “hot water supply water” corresponds to the “second heat medium” in the present invention.
The “tub water” corresponds to the “third heat medium” in the present invention.

FIG. 2 is a diagram schematically showing the piping configuration of the heat exchanger according to Embodiment 1 of the present invention.
FIG. 3 is a diagram showing a pipe cross section of the heat exchanger according to Embodiment 1 of the present invention.
FIG. 4 is a view showing one end of the header of the heat exchanger according to Embodiment 1 of the present invention.
As shown in FIGS. 2 to 4, a plurality of refrigerant pipes 1 ′ are branched from one end of the refrigerant circuit 1 through a header 20. A plurality of hot water supply pipes 9 ′ are branched from one end of the hot water supply circuit 9 through the header 20. A plurality of bath pipes 12 ′ are branched from one end of the bath circuit 12 through the header 20. The branched pipes are gathered in the header 20 at the opposite end of each circuit.

  In FIG. 2A, the hot water supply pipe 9 'is arranged adjacent to the refrigerant pipe 1'. The bath pipe 12 'is arranged adjacent to the refrigerant pipe 1'. The hot water supply pipe 9 ′, the refrigerant pipe 1 ′, and the bath pipe 12 ′ are laminated in order, thereby forming the first laminated portion 100 in which the hot water and the water for the bathtub and the refrigerant exchange heat. ing. That is, the first stacking unit 100 has a structure in which a hot water supply pipe 9 ′ constituting the hot water supply circuit 9, a refrigerant pipe 1 ′ constituting the refrigerant circuit 1, and a bath pipe 12 ′ constituting the bath circuit 12 are sequentially laminated. Yes. Moreover, the bonding surfaces adjacent to each other are, for example, closely bonded and thermally bonded. In the 1st lamination | stacking part 100, the heat | fever of a refrigerant | coolant and the water for hot water supply is dissipated to the hot water supply pipe | tube 9 'arrange | positioned adjacent to refrigerant | coolant piping 1', and the bath piping 12 'in the 1st lamination | stacking part 100. Exchange and heat exchange between the refrigerant and the water for the bathtub are performed.

  With such a configuration, when the number of first stacked portions 100 is large (the number of branched pipes), the amount of heat exchanged between water for hot water supply and water for bathtubs increases. In addition, when the number of stacked layers of the first stacked unit 100 (the number of branched pipes) is small, the heat exchange amount of water for hot water supply and water for bathtubs is small. For this reason, the heat exchange amount of the water for hot-water supply and the water for bathtubs can be adjusted with the number of lamination | stacking of the 1st lamination | stacking part 100. FIG.

  Further, in the heat exchanger 3, either one of the hot water supply pipe 9 ′ or the bath pipe 12 ′ and the refrigerant pipe 1 ′ are stacked in order, and either one of the hot water supply water or the bathtub water is stacked. A second laminated portion 200 is formed in which the refrigerant and the heat exchanger exchange heat. For example, as shown in the lower side of the drawing in FIGS. 2 and 3, the second stacking unit 200 includes a hot water supply pipe 9 ′ and a refrigerant pipe 1 ′ that are stacked in order, so that hot water supply water and refrigerant are Perform heat exchange. That is, in the second stacking section 200, two pipes are sequentially stacked, and heat from the refrigerant circuit 1 is radiated to the hot water supply pipe 9 'disposed adjacent to the refrigerant pipe 1'.

  With such a configuration, the heat exchange amount of either hot water or bathtub water can be made greater than that of the other. Moreover, when there are many lamination | stacking numbers (the number of branched piping) of the 2nd lamination | stacking part 200, the amount of heat exchange increases. In addition, when the number of stacked layers of the second stacked unit 200 (the number of branched pipes) is small, the amount of heat exchange is small. For this reason, the heat exchange amount of either the hot water supply water or the bathtub water can be adjusted by the number of stacked layers of the second stacked portion 200. Furthermore, the heat exchange amount of the water for hot water supply and the water for bathtubs can each be adjusted with the number of lamination | stacking of the 1st lamination | stacking part 100 and the 2nd lamination | stacking part 200, respectively.

  In FIG. 2B, the hot water supply pipe 9 'is arranged adjacent to the refrigerant pipe 1'. The bath pipe 12 'is arranged adjacent to the refrigerant pipe 1'. The hot water supply pipe 9 ′, the refrigerant pipe 1 ′, and the bath pipe 12 ′ are laminated in order, thereby forming the first laminated portion 100 in which the hot water and the water for the bathtub and the refrigerant exchange heat. ing. Further, a second laminated portion 200 is formed in which either one of the hot water supply pipe 9 ′ or the bath pipe 12 ′ is shorter than the other and laminated in order with the refrigerant pipe 1 ′. For example, in the drawing, the bath pipe 12 ′ is shorter than the hot water supply pipe 9 ′, and the second laminated portion 200 where the hot water supply pipe 9 ′ and the refrigerant pipe 1 ′ are laminated in order is long. In the second lamination part 200, the hot water supply pipe 9 'and the refrigerant pipe 1' are laminated in order. For this reason, the heat exchange amount of the water for hot-water supply and the water for bathtubs can be adjusted with the difference in the length of a laminated part.

Moreover, the cross-sectional shape of refrigerant | coolant piping 1 ', hot water supply piping 9', and bath piping 12 'is formed substantially the same. For example, as shown in FIG. 3, the pipe cross section is formed in a rectangular shape, and the long side and the short side have substantially the same dimensions. That is, the long side portion of each pipe is a portion related to heat conduction between the pipes, and the short side portion is a portion other than the portion related to heat conduction.
Thus, by forming the cross-sectional shapes of the pipes substantially the same, the surface area other than the part related to the heat conduction between the pipes is not increased. Therefore, it is possible to reduce the heat radiation loss due to the heat exchanger piping.

In addition, copper or aluminum can be applied to the material of the refrigerant pipe 1 ′ through which the refrigerant flows. In particular, the weight can be reduced in the case of aluminum. Moreover, copper can be used as the material of the hot water supply pipe 9 'and the bath pipe 12' through which water flows.
The refrigerant pipe 1 ′, the hot water supply pipe 9 ′, and the bath pipe 12 ′ can be joined by brazing, soldering, or adhesion.

  As described above, in the present embodiment, heat exchange is performed between a plurality of heat media, and the heat exchange amount can be adjusted for each heat medium. Moreover, the heat exchanger with few heat dissipation loss by piping of a heat exchanger can be obtained. In addition, since heat can be exchanged between a plurality of heat media by one heat exchanger 3, the number of heat exchangers 3 can be reduced, and a low-cost and energy-saving hot water supply device can be obtained. . Therefore, it is possible to obtain a heat exchanger that performs heat exchange between three or more heat media with little heat dissipation loss from the piping, and a hot water supply device including the heat exchanger.

  In addition, although this Embodiment demonstrated the structure which branches one end of each circuit into several piping via the header 20, this invention is not limited to this. For example, with respect to FIG. 2 (a), as shown in FIG. 5, the refrigerant pipe 1 ', the hot water supply pipe 9' and the bath pipe 12 'may be wound in a cylindrical shape and stacked. Also in this case, the first laminated portion 100 for laminating three pipes of the refrigerant pipe 1 ′, the hot water supply pipe 9 ′, and the bath pipe 12 ′, any one of the hot water supply pipe 9 ′ and the bath pipe 12 ′, and the refrigerant. By forming the second laminated portion 200 that laminates the two pipes with the pipe 1 ′, the amount of heat exchange can be adjusted in the same manner, and the same effects as those described above can be achieved. Although not shown in FIG. 2B, the first laminated portion 100 in which the refrigerant pipe 1 ′, the hot water supply pipe 9 ′, and the bath pipe 12 ′ are laminated in order is wound in a cylindrical shape and laminated. You may do it. Also in this case, the first laminated portion 100 for laminating three pipes of the refrigerant pipe 1 ′, the hot water supply pipe 9 ′, and the bath pipe 12 ′, any one of the hot water supply pipe 9 ′ and the bath pipe 12 ′, and the refrigerant. By forming the second laminated portion 200 that laminates the two pipes with the pipe 1 ′, the amount of heat exchange can be adjusted in the same manner, and the same effects as those described above can be achieved. In addition, how to wind each piping is not restricted to a cylindrical shape, You may laminate | stack in a planar view rectangular shape or zigzag shape.

  In addition, in this Embodiment, although the structure which performs heat exchange between the three heat media which distribute | circulate three circuits was demonstrated, it is not restricted to this but between the 4 or more heat media which distribute | circulate four or more circuits Heat exchange may be performed. For example, in the case of using four circuits, a stacking unit that stacks four pipes, a first stacking unit 100 that stacks any three, and a second stacking unit 200 that stacks any two pipings. The amount of heat exchange can be adjusted.

Embodiment 2. FIG.
In the second embodiment, the internal configuration of the refrigerant pipe 1 ′, the hot water supply pipe 9 ′, and the bath pipe 12 ′ will be described. Other configurations are the same as those in the first embodiment, and the same reference numerals are given to the same portions.

FIG. 6 is a diagram showing a pipe cross section of a heat exchanger according to Embodiment 2 of the present invention.
At least one of the refrigerant pipe 1 ′, the hot water supply pipe 9 ′, and the bath pipe 12 ′ in the present embodiment has a plurality of flow passages 21 separated by a partition wall. For example, as shown in FIG. 6A, the interior of the refrigerant pipe 1 ′ is divided by partition walls to form a plurality of flow paths 21.
By forming such a flow path, the surface area inside the refrigerant pipe 1 ′ can be increased and the heat transfer performance can be improved.
The outer diameter of the refrigerant pipe 1 'is about 8 mm to about 30 mm for the long side and about 2 mm to about 5 mm for the short side, and the internal channel 21 has a long side of about 1 mm to about 8 mm and a short side. About 1 mm to about 4.5 mm. The channel 21 is not limited to a rectangle, but may be a round hole having a diameter of about 1 mm to about 4 mm.

Further, at least one of the refrigerant pipe 1 ′, the hot water supply pipe 9 ′, and the bath pipe 12 ′ has a groove 22 therein. For example, as shown to Fig.6 (a), the groove | channel 22 is formed in hot water supply piping 9 'and the inside of bath piping 12'. The groove 22 may be linear in the flow path direction, or may be formed with an angle from the flow path direction used in a heat exchanger of an air conditioner.
By forming such a flow path 22, the flow in the pipe becomes turbulent and heat transfer performance can be improved.
The dimension of the groove 22 can be determined according to the dimension of the pipe, and the height is about 0.1 mm to about 1.5 mm, and the width is about 0.1 mm to about 0.5 mm.

Further, at least one of the refrigerant pipe 1 ′, the hot water supply pipe 9 ′, and the bath pipe 12 ′ is provided with a hollow dimple shape 23 therein. For example, as shown in FIG. 6B, dimple shapes 23 such as depressions and protrusions are formed inside the hot water supply pipe 9 ′ and the bath pipe 12 ′.
By forming such a flow path, the flow in the piping becomes a turbulent flow, and the heat transfer performance can be improved. Further, by applying the dimple shape 23 to the bath pipe 12 ', there is an effect that the heat transfer performance can be improved while preventing the bathroom pipe 12' from being clogged with hair from the bathtub 10 or the like.
The size of the dimple shape 23 can be determined according to the size of the pipe. The height is about 0.1 mm to about 1.5 mm, and the diameter of the circular dimple shape 23 is about 1 mm to about 10 mm. .

Of the refrigerant pipe 1 ′, hot water supply pipe 9 ′, and bath pipe 12 ′, pipes in which the flow path 21, the groove 22, and the dimple shape 23 are formed can be combined in a timely manner.
A flat tube having grooves 22 or a flat tube having dimples 23 such as indentations and protrusions can be manufactured by pressing a round grooved heat transfer tube flatly.

Embodiment 3 FIG.
In Embodiment 3, the operation of the hot water supply apparatus will be described.
The configuration of the hot water supply apparatus in the third embodiment is the same as that in the first embodiment. The configuration of the heat exchanger 3 is the same as that in the first or second embodiment.

FIG. 7 is an operation diagram of a hot water supply apparatus including a heat exchanger according to Embodiment 3 of the present invention. In addition, the arrow in a figure shows the flow of a refrigerant | coolant and water or hot water.
In FIG. 7, when the refrigerant circuit 1 operates, the low-temperature and low-pressure gas refrigerant is compressed by the compressor 2 and discharged as a high-temperature and high-pressure gas refrigerant. The high-temperature and high-pressure gas refrigerant discharged from the compressor 2 flows into the heat exchanger 3. At this time, the refrigerant is cooled while heating water for hot water supply and water for bathtubs, and becomes a low-temperature and high-pressure liquid refrigerant. The low-temperature and high-pressure liquid refrigerant flowing out of the heat exchanger 3 is expanded and depressurized by the expansion valve 4 to be in a low-temperature and low-pressure gas-liquid two-phase state. The low-temperature and low-pressure gas-liquid two-phase refrigerant exiting the expansion valve 4 flows into the evaporator 5. Then, the refrigerant is heated by the air from the fan 6 and becomes a low-temperature and low-pressure gas refrigerant.

  In the hot water supply circuit 9, when water is heated in the hot water supply tank 7 (heated water is stored), the water flowing out from the lower portion of the hot water supply tank 7 is caused to flow into the heat exchanger 3 by the hot water supply pump 8. At this time, water for hot water supply is heated by exchanging heat with the refrigerant. Water for hot water supply that has absorbed heat in the heat exchanger 3 and has reached a high temperature flows from the upper part of the hot water supply tank 7 and is stored in the hot water supply tank 7. At this time, the pipe connecting the hot water supply tank 7 and the faucet 13 is closed by an on-off valve (not shown).

  When the bath circuit 12 performs a reheating operation for heating the hot water stored in the bathtub 10, the water that flows out from the lower portion of the bathtub 10 is caused to flow into the heat exchanger 3 by the bath pump 11. At this time, the water for the bathtub is heated by exchanging heat with the refrigerant. The water for the bathtub that has been absorbed by the heat exchanger 3 and has become hot is returned to the bathtub 10 again.

  As described above, the heat exchanger 3 includes the refrigerant pipe 1 ′, the hot water supply pipe 9 ′, and the bath pipe 12 ′, and the refrigerant circuit 1, the hot water supply circuit 9, and the bath circuit 12 are connected to each other. For this reason, boiling of water in the hot water supply tank 7 and reheating of the bathtub 10 can be performed by one heat exchanger 3.

FIG. 8 is an operation diagram of a hot water supply apparatus including a heat exchanger according to Embodiment 3 of the present invention. The arrows in the figure indicate the flow of refrigerant and water or hot water.
In FIG. 8, when hot water is stored in the bathtub 10 after boiling water in the hot water tank 7 (hot water), the water (hot water) stored in the hot water tank 7 is supplied from the tap 13. . At this time, not only hot water in the hot water supply tank 7 but also hot water is applied while operating the hot water supply pump 8 of the refrigerant circuit 1 and the hot water supply circuit 9.
That is, the refrigerant circuit 1 operates as described above, and in the hot water supply circuit 9, water flowing out from the lower portion of the hot water supply tank 7 is caused to flow into the heat exchanger 3 by the hot water supply pump 8. Then, the water heated through the hot water supply pipe 9 ′ of the heat exchanger 3 and the stored hot water flowing out from the upper part of the hot water supply tank 7 are mixed and hot water is supplied from the faucet 13. The amount of water in the hot water supply tank 7 is adjusted to a certain amount by the water supply 14 that supplies tap water and the like. Moreover, the water for hot water supply from the faucet 13 is mixed with the water supply 14 for supplying, for example, tap water and adjusted to an appropriate temperature.

  In this way, by mixing the water flowing through the hot water supply pipe 9 ′ of the heat exchanger 3 and the hot water flowing out of the hot water tank 7, the hot water temperature in the hot water tank 7 is reduced. Hot water can be applied even when the temperature is lower than the required temperature. Moreover, since hot water is poured from the hot water supply tank 7 and the water supply 14, the hot water time can be shortened.

FIG. 9 is an operation diagram of a hot water supply apparatus including a heat exchanger according to Embodiment 3 of the present invention. In addition, the arrow in a figure shows the flow of a refrigerant | coolant and water or hot water.
In FIG. 9, when the bathtub 10 is reheated after boiling the water in the hot water supply tank 7, the hot water supply pump 8 of the hot water supply circuit 9 is operated to supply heated hot water (hot water). The heat exchanger 3 is circulated. At this time, the pipe connecting the hot water supply tank 7 and the faucet 13 is closed by an on-off valve (not shown). The bath circuit 12 causes the water in the bathtub 10 to flow into the heat exchanger 3 by the bath pump 11 and exchanges heat with water for hot water supply to retreat. At this time, the refrigerant circuit 1 is in a stopped state.

  Thus, when sufficient hot water remains in the hot water supply tank 7, the bathtub 10 can be reheated using the heat of the hot water supply tank 7.

FIG. 10 is an operation diagram of a water heater provided with a heat exchanger according to Embodiment 3 of the present invention. In addition, the arrow in a figure shows the flow of a refrigerant | coolant and water or hot water.
In the operation described with reference to FIG. 9, when the bathtub 10 is reheated using the hot water in the hot water tank 7, the hot water whose temperature has been lowered after the heat exchange with the water in the bathtub 10 returns to the hot water tank 7. . When the temperature of the hot water stored in the hot water supply tank 7 decreases, it cannot be used for hot water supply or the like. Further, when the temperature in the hot water supply tank 7 is changed from about 30 ° C. to about 40 ° C., the hot water at this temperature is again heated to the high temperature by the heat exchange with the refrigerant circuit 1, so that the refrigerant condensation temperature in the heat exchanger 3 is high. Therefore, the efficiency becomes worse.
On the other hand, in FIG. 10, the refrigerant circuit 1 causes the high-temperature refrigerant discharged from the compressor 2 to flow through the refrigerant pipe 1 ′ of the heat exchanger 3 as in the description of FIG. 7. And the bath circuit 12 distribute | circulates the water in the bathtub 10 to the bath piping 12 'of the heat exchanger 3 with the bath pump 11, and heats it up with a refrigerant | coolant. At this time, the circulation of water in the hot water supply circuit 9 is in a stopped state.

  In this way, since the reheating of the bathtub 10 can be performed by heat exchange with the refrigerant of the refrigerant circuit 1, the hot water temperature in the hot water supply tank 7 is not lowered. Therefore, there is an energy saving effect.

FIG. 11 is an operation diagram of a hot water supply apparatus including a heat exchanger according to Embodiment 3 of the present invention. In addition, the arrow in a figure shows the flow of a refrigerant | coolant and water or hot water.
In FIG. 11, the refrigerant circuit 1 causes the high-temperature refrigerant discharged from the compressor 2 to flow through the refrigerant pipe 1 ′ of the heat exchanger 3 in the same manner as in the description of FIG. Similarly to the description of FIG. 9, the hot water supply circuit 9 circulates heated hot water (hot water) to the hot water supply pipe 9 ′ of the heat exchanger 3 after boiling the water in the hot water tank 7. Let And the bath circuit 12 distribute | circulates the water in the bathtub 10 to the bath piping 12 'of the heat exchanger 3 with the bath pump 11, and heat-exchanges the refrigerant | coolant and the water for hot-water supply, and the water for bathtubs, and replenishes it. To do.

  Thus, the reheating of the bathtub 10 is performed using both the refrigerant of the refrigerant circuit 1 and the hot water of the hot water supply tank 7. By doing so, it is possible to prevent the temperature of the hot water in the hot water supply tank 7 from being lowered as the bathtub 10 is reheated, and the hot water temperature in the hot water supply tank 7 is not reduced. Therefore, there is an energy saving effect.

FIG. 12 is an operation diagram of a water heater provided with a heat exchanger according to Embodiment 3 of the present invention. In addition, the arrow in a figure shows the flow of a refrigerant | coolant and water or hot water.
When the refrigerant circuit 1 is operated, the evaporator 5 may be frosted depending on the temperature and humidity conditions of the outside air absorbed by the heat pump cycle, and it is necessary to defrost and remove this frost.
In FIG. 12, the hot water supply circuit 9 causes heated water (hot water) to flow through the hot water supply pipe 9 ′ of the heat exchanger 3 after the water in the hot water tank 7 is boiled. The refrigerant circuit 1 causes the high-temperature refrigerant discharged from the compressor 2 to flow through the refrigerant pipe 1 ′ of the heat exchanger 3. At this time, the temperature difference between the refrigerant and hot water (hot water) becomes smaller than that described with reference to FIG. 7, and the condensation temperature in the heat exchanger 3 operating as a condenser increases. Thereby, the evaporation temperature in the evaporator 5 rises and the frost that has formed on the evaporator 5 can be melted.
Thus, the defrosting of the evaporator 5 can be performed using the heat in the hot water supply tank 7.

FIG. 13 is an operation diagram of a hot water supply apparatus including a heat exchanger according to Embodiment 3 of the present invention. In addition, the arrow in a figure shows the flow of a refrigerant | coolant and water or hot water.
In FIG. 13, the bath circuit 12 causes the bath water (hot water) stored in the bathtub 10 to flow through the bath piping 12 ′ of the heat exchanger 3 with the bath pump 11. The refrigerant circuit 1 causes the high-temperature refrigerant discharged from the compressor 2 to flow through the refrigerant pipe 1 ′ of the heat exchanger 3. At this time, the temperature difference between the refrigerant and the bath water (hot water) is smaller than that described with reference to FIG. 7, and the condensation temperature in the heat exchanger 3 operating as a condenser is increased. Thereby, the evaporation temperature in the evaporator 5 rises and the frost that has formed on the evaporator 5 can be melted.
Thus, the defrosting of the evaporator 5 can be performed using the heat in the bathtub 10. Moreover, in the bathtub 10, exhaust heat can be used for defrosting by using the heat after bathing (after use). Therefore, there is an energy saving effect.

  In the first to third embodiments, the case where a bath circuit is used as an example of the “heat utilization circuit” of the present invention has been described, but the present invention is not limited to this. For example, a floor heating circuit may be used.

  1 refrigerant circuit, 1 ′ refrigerant pipe, 2 compressor, 3 heat exchanger, 4 expansion valve, 5 evaporator, 6 fan, 7 hot water supply tank, 8 hot water supply pump, 9 hot water supply circuit, 9 ′ hot water supply pipe, 10 bathtub, 11 Bath pump, 12 bath circuit, 12 ′ bath piping, 13 faucet, 14 water supply, 20 header, 21 flow path, 22 groove, 23 dimple shape, 100 first laminated portion, 200 second laminated portion.

Claims (10)

A first flow path through which a first heat medium serving as a heat source flows;
A second channel disposed adjacent to the first channel and through which the second heat medium flows;
A third flow path disposed adjacent to the first flow path and through which a third heat medium flows;
The second flow path, the first flow path, and the third flow path are laminated in order, and the second heat medium, the third heat medium, and the first heat medium are stacked. And a plurality of first laminated parts that perform heat exchange are laminated,
Either the second flow path or the third flow path and the first flow path are laminated in order, and either the second heat medium or the third heat medium A heat exchanger, wherein a second laminated part for exchanging heat with the first heat medium is laminated on the first laminated part. The heat exchanger according to claim 1, wherein the first flow path, the second flow path, and the third flow path have substantially the same cross-sectional shape. The at least one of said 1st flow path, said 2nd flow path, and said 3rd flow path divided | segmented the inside with the partition, and formed the several flow path. Heat exchanger. The heat exchanger according to claim 1 or 2, wherein at least one of the first flow path, the second flow path, and the third flow path is provided with a groove therein. 3. The heat according to claim 1, wherein at least one of the first flow path, the second flow path, and the third flow path is provided with a hollow dimple shape therein. Exchanger. A hot water supply apparatus comprising the heat exchanger according to any one of claims 1 to 5. A heat pump cycle in which a compressor, the first flow path of the heat exchanger, an expansion valve, and an evaporator are connected in an annular shape to circulate a refrigerant as the first heat medium;
A hot water supply tank, the second flow path of the heat exchanger, and a hot water supply pump connected annularly, circulating water as the second heat medium and storing it in the hot water supply tank;
The hot water supply apparatus according to claim 6, further comprising: a heat utilization circuit that connects the third flow path of the heat exchanger and a circulation pump in a ring shape and circulates the third heat medium. The hot water supply circuit is
The hot water supply apparatus according to claim 7, further comprising a hot water supply port through which the water flowing through the second flow path of the heat exchanger and the water flowing out of the hot water supply tank are mixed and flowed out. . The heat pump cycle is
Circulating the high-temperature refrigerant discharged from the compressor through the first flow path of the heat exchanger;
The hot water supply circuit is
Storing the water heated by exchanging heat with the refrigerant in the hot water supply tank, circulating the heated water through the second flow path of the heat exchanger,
The thermal utilization circuit is
Circulating the third heat medium to the third flow path of the heat exchanger;
The hot water supply apparatus according to claim 7, wherein the heated water and the refrigerant are exchanged with the third heat medium to heat the third heat medium. The heat pump cycle is
Circulating the high-temperature refrigerant discharged from the compressor through the first flow path of the heat exchanger;
The thermal utilization circuit is
Circulating the third heat medium to the third flow path of the heat exchanger;
The hot water supply apparatus according to claim 7, wherein the third heat medium is heated by exchanging heat between the refrigerant and the third heat medium.

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