JP2009243797A - Water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water heater for suppressing scale adhesion by removing a large amount of air bubbles generated within a water side heat-transfer pipe of a water refrigerant heat exchanger. <P>SOLUTION: The water heater K includes a heat pump refrigerant circuit 1 constituted by interconnecting a compressor 4, a refrigerant side heat-transfer pipe 30 of the water refrigerant heat exchanger 3, an expansion valve 6 and a heat source side heat exchanger 7; and with a water channel 2 for hot water supply constituted by interconnecting a water pump 22 and the water side heat-transfer pipe 29 of the water refrigerant heat exchanger 3 performing heat exchange with a refrigerant within the refrigerant side heat-transfer pipe 30. The water heater K is further provided with a connection member 31 or vibration drivers 32, 33 (water outlet part vibration means) for vibrating a water outlet part 29E of the water side heat-transfer pipe 29 of the water refrigerant heat exchanger 3. The drivers 32, 33 are controlled by a control part 20 of a control device 19 based on detection values by respective sensors 15, 16, 17. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a heat pump type water heater, and more particularly to a water heater that physically removes bubbles generated in a water flow path of a water-refrigerant heat exchanger.

In recent years, a refrigeration cycle apparatus using a natural refrigerant has been developed in response to the flow of defluorination. Among them, the popularization of refrigeration cycle apparatuses using carbon dioxide (CO2) as a refrigerant is increasing year by year, and uses thereof are expanding to car air conditioners, air conditioners, refrigerators and the like. The characteristics of the CO2 refrigerant are an ozone depletion coefficient of 0, a global warming coefficient of 1, and a low environmental load. Incidentally, the HFC refrigerant that has been used in the refrigeration cycle apparatus for many years has an ozone depletion coefficient of 0, but a global warming coefficient of 1000 to 2000. In addition, the CO2 refrigerant is not toxic, flammable and inexpensive.

On the other hand, a heat pump type water heater is known that heats water using the heat of condensation of a refrigerant or the like using atmospheric heat or the like as a heat source of a heat pump refrigerant circuit. The water used for this water heater is tap water or groundwater. In general, tap water, groundwater, and the like contain hardness components such as calcium and magnesium, but depending on the region, they may contain a very large amount of hardness components. Therefore, when water containing a relatively large hardness component is heated to a high temperature for a long time with a water-refrigerant heat exchanger of a heat pump type hot water heater, the hardness component is scaled around the water outlet portion of the water channel that is at the highest temperature. For example, it often precipitates as calcium carbonate). When such a scale adheres and accumulates on the heat transfer surface in the water flow path of the water-refrigerant heat exchanger, the flow loss becomes water flow resistance and pressure loss increases. Moreover, it becomes the heat resistance of the heat transfer surface when the refrigerant and water exchange heat, and the performance as a heat exchanger is significantly reduced. Furthermore, if the water flow path is completely blocked by the scale, there is a possibility that the hot water supply operation by the heat pump type hot water heater becomes impossible.

Japanese Patent Laying-Open No. 2005-077062

By the way, in the heat pump water heater using a CO2 refrigerant capable of high temperature hot water (about 90 ° C.), the amount of air that can be dissolved in water is decreased, and the generation rate of bubbles is increased. When the generation of bubbles increases, bubbles accumulate on the inner surface of the water flow path of the water-refrigerant heat exchanger, and the flow path resistance increases. In addition, calcium carbonate that causes scales is more likely to precipitate as the water temperature increases. In the continuous operation, even if the scale is deposited, most of the scale is discharged, so that the amount adhering to the inner surface of the water flow path is relatively small. However, in the intermittent operation, the scale floating at the time of stop is not discharged and the amount of adhesion increases. The heat pump water heater using CO2 refrigerant that can discharge hot water has a high bubble generation rate, so bubbles accumulate in the water flow path even during continuous operation. To do. Moreover, since the dissolved gas is generated as bubbles and accumulated on the inner surface of the water channel, the channel resistance increases, so that the floating scale tends to adhere. When the scale adheres, the possibility of clogging increases because there is a risk that the clogging of the piping may occur, as well as a reduction in the effective heat transfer area.

A conventional heat pump type water heater using an HFC refrigerant has adopted a circulating heating method. This is because the characteristics of the HFC refrigerant can be operated more efficiently when the temperature of water is gradually increased. Therefore, as shown in FIG. 11A, the temperature is raised to the target hot water temperature by circulating water several times between the hot water supply device K1 and the hot water storage tank 60. In this case, since the maximum hot water temperature can only be raised to 70 ° C., the rate of occurrence of bubbles in the water flow path of the water heater K1 is small.

On the other hand, many heat pump water heaters using CO2 refrigerant adopt a one-time temperature rising method. This is because the characteristics of the CO2 refrigerant can be operated more efficiently when the temperature is increased from low temperature to high temperature all at once. CO2 has a large change in calorie with respect to temperature at low temperatures, and is an advantageous refrigerant at low temperature water entry. A schematic configuration of the heat pump type hot water heater K2 and the hot water storage tank 60 is shown in FIG. In this configuration, since the temperature is raised to 90 ° C. at a stretch in the water flow path of the water refrigerant heat exchanger of the water heater K2 and supplied to the hot water storage tank 60, the rate of occurrence of bubbles in the water flow path is high.

FIG. 12 shows a general relationship between the water temperature and the dissolved oxygen concentration with respect to water. From the curve in the figure, it can be seen that there is an inflection point in the vicinity of the water temperature of 80 ° C., and when it exceeds 80 ° C., the amount of dissolved oxygen further decreases.

FIG. 13 shows the relationship between the water temperature of pH = 7.0 and pH = 8.0, which is the national average water quality, and the solubility of calcium carbonate. From the curve in the figure, it can be seen that when the water temperature exceeds 80 ° C., calcium carbonate hardly dissolves in water and tends to precipitate.

That is, each knowledge mentioned above has shown that it becomes a subject peculiar to the heat pump type water heater using the CO2 refrigerant | coolant with the highest maximum hot-water temperature. As described above, if the heat exchange efficiency is lowered due to the scale of the water flow path of the water-refrigerant heat exchanger or the heat exchanger is replaced due to blockage, the operation cost and the maintenance cost are increased.

The present invention has been made to solve the above-described problems, and scale adhesion can be suppressed by removing a large amount of bubbles generated in the water-side heat transfer tube of the water-refrigerant heat exchanger. The purpose is to provide a water heater.

A water heater according to the present invention includes a heat pump refrigerant circuit formed by connecting a compressor, a refrigerant side heat transfer tube, an expansion valve, and a heat source side heat exchanger of a water refrigerant heat exchanger, a water pump, and a refrigerant side heat transfer tube. The water outlet of the water-side heat transfer tube of the water-refrigerant heat exchanger is vibrated in a water heater having a hot-water supply channel formed by connecting water-side heat transfer tubes of a water-refrigerant heat exchanger that exchanges heat with other refrigerants. The water outlet portion vibrating means is provided.

In the water heater of the present invention, focusing on the fact that the rate of bubbles increases at the water outlet of the water-side heat transfer tube of the water-refrigerant heat exchanger where the water flowing in the hot-water supply channel becomes hot, the water-refrigerant heat exchanger Bubbles were removed by vibrating the water outlet portion of the water-side heat transfer tube by the water outlet portion vibration means. This is the same reason that bubbles are generated on the inner surface when boiling water in a pan, but at that time, the bubbles can be removed by applying a little vibration to the pan. Thus, by removing the bubbles in the water flow path, an increase in flow path resistance can be suppressed, and scale adhesion can be suppressed. As a result, it is possible to suppress a decrease in effective heat transfer area and blockage due to scale. Thereby, it is possible to provide a heat pump type hot water heater excellent in reliability against the adhesion of scale.

Embodiment 1 FIG.
FIG. 1 is a circuit configuration diagram of a water heater in Embodiment 1 of the present invention.
In the figure, a water heater K according to the first embodiment includes a heat pump refrigerant circuit 1 and a hot water supply channel 2. In the heat pump refrigerant circuit 1, the compressor 4, the refrigerant side heat transfer tube 30 of the heat transfer tube coil 24 of the water refrigerant heat exchanger 3, the expansion valve 6, the heat source side heat exchanger 7, and the accumulator 8 are connected in an annular shape by the refrigerant pipe 9. Has been configured. In the heat pump refrigerant circuit 1, carbon dioxide (CO2) is used as a refrigerant. The hot water supply channel 2 includes a water pump 22, a water flow rate adjustment valve 12, and a water side heat transfer tube 29 of a heat transfer tube coil 24 of the water refrigerant heat exchanger 3 connected in series by a water pipe 14. In the water-refrigerant heat exchanger 3, heat is exchanged between the water in the water flow path 13 of the water-side heat transfer tube 29 and the refrigerant in the refrigerant flow path 5 of the refrigerant-side heat transfer tube 30. Then, outdoor air is blown to the heat source side heat exchanger 7 by a fan 10 driven by a motor 11. Further, the outlet side water temperature sensor 18 is arranged at the water outlet 29 </ b> E of the water side heat transfer tube 29 of the heat transfer tube coil 24. The operating capacity of the heat pump refrigerant circuit 1 is controlled such that the temperature detected by the outlet water temperature sensor 18 is the hot water supply target temperature (for example, 90 ° C.). This hot water heater K employs a one-time temperature raising method capable of high temperature hot water.

Next, the outer structure of the water heater K is shown in FIGS. The front panel 42, the fingered 43, and the upper panel 44 are disposed in the front part of the base 41, the side panel 45 and the side panel 46 are provided on both sides of the base 41, and the rear panel 49 and the rear upper part are disposed on the back of the base 41. A panel 47 is provided. A fan guard 48 is installed in an upper surface opening surrounded by the upper panel 44, the side panel 45, the side panel 46, and the rear upper panel 47. The heat source side heat exchanger 7 is disposed so as to cross the air passage formed by the side panels 45, 46, the bell mouth 50, and the machine room partition plate 51, and the fan 10 and the heat source side heat exchanger 7 are disposed above the heat source side heat exchanger 7. A motor 11 is arranged. Further, in the machine room partitioned from the outside environment by the machine room partition plate 51, the front panel 42, and the rear panel 49 in the lower part of the casing, the compressor 4, the expansion valve 6, the accumulator 8, the electromagnetic valve 36, the water refrigerant heat exchange. The vessel 3, the water pump 22, the water flow rate adjusting valve 12, the piping group connecting them, the control box 23, and others are provided.

On the other hand, the compressor 4, the expansion valve 6, the electromagnetic valve 36, the control box 23, and the water pump 22 are arranged at the front of the base 41 because the service frequency is high, and the front panel 42 at the bottom of the unit is removed. Repair and replacement work is performed. Therefore, the water-refrigerant heat exchanger 3 having a large volume and a relatively low service frequency cannot be disposed at the front portion, and is disposed at the rear portion of the base 41.

The service work such as repair and replacement of the water refrigerant heat exchanger 3 is difficult from the front because the compressor 4, the control box 23, the refrigerant piping group and the like are obstructed, and the service work is started from the rear panel 49. The work is not possible due to the small space. Moreover, since the side panels 45 and 46 are structural members that support the weight of the fan 10 and other panels, it is difficult to remove them. In addition, since the heat source side heat exchanger 7 is arranged also in the upper part of the water refrigerant heat exchanger 3, the operation becomes difficult.

As shown in FIG. 5, the water-refrigerant heat exchanger 3 includes five-pass heat transfer tube coils 24 (1), 24 (2), 24 (3), 24 (4), 24 (5), and a heat transfer tube coil. Water inlet header 26 to which the water inlet side of water side heat transfer tubes 29, 29, 29, 29, 29 to 24 (1), 24 (2), 24 (3), 24 (4), 24 (5) is connected. And the water discharge side of the water side heat transfer tubes 29, 29, 29, 29, 29 from the heat transfer tube coils 24 (1), 24 (2), 24 (3), 24 (4), 24 (5) are connected. The water outlet header 25 and the refrigerant side heat transfer tubes 30, 30, 30, 30, 30 to the heat transfer tube coils 24 (1), 24 (2), 24 (3), 24 (4), 24 (5) The refrigerant inlet header 27 connected to the refrigerant inlet side and the heat transfer tube coils 24 (1), 24 (2), 24 (3), 24 (4), 24 (5) Constituted by a refrigerant outlet header 28 the refrigerant outlet side of the medium side heat transfer tubes 30,30,30,30,30 are connected. These heat transfer tube coil 24, water inlet header 26, water outlet header 25, refrigerant inlet header 27, and refrigerant outlet header 28 are connected by brazing or the like. By the way, in order to increase the hot water supply capacity, it is necessary to enlarge the water-refrigerant heat exchanger 3. However, if the heat transfer tube length of the water-refrigerant heat exchanger 3 is increased, the pressure loss on the water flow path 13 side and the refrigerant flow path 5 side is increased. Therefore, when increasing the hot water supply capacity, the heat transfer tube coils 24 are arranged in parallel in a plurality of paths as shown in FIG. In addition, since this water heater K has the capacity | capacitance equivalent to the maximum capacity | capacitance of 20 horsepower, the heat transfer tube coil 24 (n = 1-5) of 5 paths | paths (5) is mounted. The length of the one-pass heat transfer tube coil 24 is about 10 m.

FIG. 6A shows an example of a cross-sectional view of the heat transfer tube coil 24 of the water-refrigerant heat exchanger 3 of FIG. The heat transfer tube coil 24 increases the heat transfer area by twisting and fixing three refrigerant side heat transfer tubes 30, 30, 30 (each inner diameter of about 4 mmφ) around the water side heat transfer tube 29 (inner diameter of about 15 mmφ), Heat exchange is performed using water and a refrigerant as opposed flows. The heat transfer tube coil 24 can achieve high efficiency and space saving. However, since the inner surface structure of the water-side heat transfer tube 29 is complicated, bubbles are likely to stay. Locations of concern for staying are shown in a circle of a one-dot chain line in FIG. If air bubbles stay in the place where the stagnation is concerned, the effective heat transfer area decreases. Therefore, a reliable method for removing bubbles is required.

The heat transfer tube coil used in the present invention is not limited to the heat transfer tube coil 24 described above, and may be a heat transfer tube coil 24A as shown in FIG. This heat transfer tube coil 24A has a double tube structure in which a water side heat transfer tube 29A is accommodated in a refrigerant side heat transfer tube 30A. In this case, heat is exchanged with water in the water flow path 13A by using water and a refrigerant as opposed flows and flowing the refrigerant through the refrigerant flow path 5A around the water side heat transfer tube 29A.

FIG. 7 shows the relationship between the water temperature and the scale film thickness in the water-refrigerant heat exchanger of the hot water heater used in different areas. As can be seen from the curve in the figure, although there is a slight difference in the tendency, there is a tendency that the adhesion of the scale becomes remarkable from the portion where the water temperature is 80 ° C. or higher. Although there is a difference in the amount of hardness components such as calcium and magnesium depending on the region, the scale film pressure at the time of melting varies, but it can be seen that the film thickness is equivalent at 90 ° C. or higher. As a result, even if there is a difference in the amount of hardness component, there is no difference in the amount of adhesion of the scale, and as the temperature rises, the amount of air that can be dissolved decreases and bubbles are generated, collecting on the inner surface of the water-side heat transfer tube, and the flow resistance It can be said that the occurrence rate of scale has increased due to the increase of.

FIG. 8 shows the relationship between the distance from the water outlet end in the water-side heat transfer tube of the water-refrigerant heat exchanger with the scale attached and the scale film thickness. As can be seen from the curve in the figure, the portion where the scale easily adheres is 4 to 8% of the entire heat exchanger, and a large amount of bubbles are generated in this range. . Since the total length of one path of the heat transfer tube coil of the water heater K is about 10 m, the vibration (water outlet portion 29E) extends from the water outlet end to about 10% of the total length (in this case, about 1 m). Giving and removing bubbles leads to suppression of scale deposition.

Therefore, in this water heater K, vibration parts in the casing that vibrate, such as the water pump 22, the compressor 4, the suction pipe or the discharge pipe of the compressor 4, the water outlet header 25, or the water-side heat transfer pipe 29. The exposed portion is connected by a connecting member such as a binding band 31. In this water heater K, for convenience in handling the piping in the casing, as shown in FIG. 9, for example, the suction pipe 9A of the compressor 4 and the water outlet of the water-side heat transfer pipe 29 of the water-refrigerant heat exchanger 3 are used. The portion 29E is connected by a binding band 31. Thereby, during the operation of the compressor 4, the vibration of the vibration component is always transmitted from the water outlet header 25 to the water side heat transfer pipe 29 to resonate the water outlet portion 29E, and as a result, bubbles are attached to the inner surface of the water outlet portion 29E. Remove or remove from the inner surface. In addition, since it will cause a noise when piping is made to contact directly, it is good to fix by interposing a buffering material in between.
That is, the binding band 31 is an example of the water outlet vibration means and the connecting member according to the present invention that vibrates the water outlet of the water side heat transfer tube of the water refrigerant heat exchanger.

As described above, according to the water heater K of the first embodiment, the water-side heat transfer tube 29 is resonated with the suction pipe 9A of the compressor 4 connected so as to be able to transmit vibration through the binding band 31. Without staying on the inner surface of the water flow path 13, bubbles can be expelled from the water side heat transfer tube 29 by the flowing water and discharged from the water outlet header 25. As a result, a sufficient heat transfer area can be ensured, and performance degradation and scale adhesion can be suppressed. Furthermore, it contributes to peeling and detachment of the attached scale. Note that the water outlet header 25 has a vertical arrangement, and water flows upward in the header, so that air bubbles from the water-side heat transfer tube 29 can be discharged efficiently and quickly.

Embodiment 2. FIG.
In the first embodiment, the example using the vibration of the vibration component such as the compressor 4 is shown. However, in the second embodiment, the water outlet header 25 or the water-side heat transfer tube 29 is directly vibrated.
As shown in FIG. 10 (A), the vibration drive units 32, 32, 32, 32, 32 each composed of a small electric vibrator are connected to the water-side heat transfer tube 29 from the main body of the water-refrigerant heat exchanger 3. , 29, 29, 29, 29 are attached to each exposed portion. These vibration drive units 32, 32, 32, 32, 32 are driven by an external power source to vibrate the exposed portions of the water-side heat transfer tubes 29, 29, 29, 29, 29. These vibrations are transmitted to each water-side heat transfer tube 29 to resonate each water outlet 29E and remove bubbles on the inner surface.

Alternatively, as shown in FIG. 10 (B), the vibration driving machine 33 constituted by a vibrator or the like is connected to the water side heat transfer tubes 29, 29, 29, 29, 29 of the water refrigerant heat exchanger 3. Attached to the water discharge side header 25. The vibration driving machine 33 is driven by an external power source to vibrate the water discharge side header 25. This vibration is transmitted to each water-side heat transfer tube 29 to resonate each water outlet 29E and remove bubbles on the inner surface.
That is, these vibration driving machines 32 and 33 are another example of the water outlet portion vibration means according to the present invention, which vibrates the water outlet portion of the water side heat transfer tube of the water refrigerant heat exchanger.

  Therefore, according to the water heater K of the second embodiment, the vibration driving machines 32 and 33 are driven by an external power source as well as the effects described in the first embodiment. There is an advantage that the water outlet 29E of the heat transfer tube 29 can be vibrated and the magnitude of the vibration can be changed.

Embodiment 3 FIG.
Next, a control example of the vibration driving machine 32 or the vibration driving machine 33 according to the second embodiment will be described. In this configuration, as shown in FIG. 1, an inlet side water temperature sensor (inlet side water temperature detecting means) 15 is provided on the inlet side of the water side heat transfer tube 29 of the water refrigerant heat exchanger 3. The inlet water temperature sensor 15 detects the water temperature on the inlet side of the water heat transfer tube 29. On the outlet side of the water-side heat transfer tube 29 of the water-refrigerant heat exchanger 3, an outlet-side water temperature sensor (outlet-side water temperature detecting means) 16 is provided. The outlet water temperature sensor 16 detects the water temperature on the outlet side of the water heat transfer tube 29. A water flow rate sensor (water flow rate detection means) 17 is provided on the outlet side of the water side heat transfer tube 29 of the water refrigerant heat exchanger 3. The water flow rate sensor 17 detects the flow rate of the outlet water flowing through the water heat transfer tube 29 of the water refrigerant heat exchanger 3. The hot water heater K is provided with a control device 19 for performing the control. The control device 19 includes a control unit 20 configured by an MPU or the like, and a memory 21 that stores data such as predetermined hot water supply operation efficiency related to the hot water heater K.

Therefore, the control unit 20 (control means) obtains a temperature difference between the inlet side water temperature and the outlet side water temperature of the water side heat transfer tube 29 detected by each of the sensors 15, 16, and 17, and the obtained temperature difference. The hot water supply operation efficiency is calculated from the detected water flow velocity. When the calculated hot water supply operation efficiency is lower than the predetermined hot water supply operation efficiency stored in the memory 21 in advance, the vibration drive unit 32 or the vibration drive unit 33 is driven to vibrate the water outlet 29E of the water-side heat transfer tube 29. It is.
Therefore, according to the hot water supply apparatus K of the third embodiment, a decrease in hot water supply operation efficiency can be detected. When a decrease in hot water supply operation efficiency is detected, the vibration side drive tubes 29 and 33 are driven to drive the water side heat transfer tube 29. Since the water outlet portion 29E is vibrated, the retention of bubbles and scale adhesion in the water outlet portion 29E are suppressed, and further, the attached scale is peeled off, so that the hot water supply operation efficiency is maintained as it is, or Can be improved.

An outlet water temperature sensor 18 (see FIG. 1) for detecting the water temperature of the water outlet 29E of the water refrigerant heat exchanger 3 is provided, and the water temperature detection value of the outlet water temperature sensor 18 is previously set in the controller 19. It is also possible to configure the control unit 20 to activate the vibration drivers 32 and 33 when a predetermined water temperature (for example, 70 ° C. at which bubbles are increased) stored in the memory 21 is exceeded.

  As the refrigerant used in the heat pump refrigerant circuit of the water heater, the carbon dioxide described above is most suitable, but other than that, it is also possible to use a refrigerant that makes the hot water temperature 70 ° C. or higher.

It is a circuit block diagram of the water heater in Embodiment 1 of this invention. It is an external view of the water heater in Embodiment 1 of this invention. It is a disassembled perspective view of the water heater in Embodiment 1 of this invention. It is a top view in the machine room of the water heater in Embodiment 1 of this invention. It is a perspective view of the water refrigerant | coolant heat exchanger of the water heater in Embodiment 1 of this invention. FIG. 5 is a cross-sectional view taken along line AA in FIG. 5, (A) is a cross-sectional view of the heat transfer tube coil of the water heater in Embodiment 1, and (B) is a cross-sectional view illustrating another example of the heat transfer tube coil. It is a figure which shows the relationship between the water temperature and the scale film thickness in the water refrigerant | coolant heat exchanger of the water heater used in a different area and to which the scale adhered. It is a figure which shows the relationship between the distance from the water exit end in the water side heat exchanger tube of the water refrigerant heat exchanger to which the scale adhered, and a scale film thickness. It is an external view which shows an example which provided the water exit part vibration means in the water heater in Embodiment 1 of this invention. It is a figure which shows the example which provided the water outlet part vibration means in the water heater in Embodiment 2 of this invention, Comprising: (A) is a perspective view which shows another example of a water outlet part vibration means, (B) is a water outlet. It is a perspective view which shows the other example of a part vibration means. It is a figure which shows schematic structure figure of a general heat pump water heater and a hot water storage tank, Comprising: (A) is a figure which shows the thing of the circulation-type temperature rising system which circulates hot water, (B) is a transient type which produces | generates hot water from water It is a figure which shows the thing of a temperature rising system. It is a figure which shows the general relationship between water temperature and the dissolved oxygen concentration with respect to water. It is a figure which shows the relationship between the water temperature of water of pH = 7.0 and pH = 8.0 which are national average water quality, and the solubility of calcium carbonate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat pump refrigerant circuit, 2 Hot water supply channel, 3 Water refrigerant heat exchanger, 4 Compressor, 6 Expansion valve, 7 Heat source side heat exchanger, 9 Refrigerant piping, 9A Suction piping, 14 Water piping, 15 Inlet water temperature sensor, 16 Outlet water temperature sensor, 17 Water flow rate sensor, 20 Control part, 21 Memory, 22 Water pump, 25 Water outlet header, 29, 29A Water side heat transfer pipe, 29E Water outlet part, 30, 30A Refrigerant side heat transfer pipe, 31 Cable ties, 32, 33 Vibration drive, K Water heater.

Claims (5)

Heat is generated between the heat pump refrigerant circuit formed by connecting the compressor, the refrigerant side heat transfer tube of the water refrigerant heat exchanger, the expansion valve, and the heat source side heat exchanger, and the water pump and the refrigerant in the refrigerant side heat transfer tube. A water outlet portion vibration means for vibrating a water outlet portion of the water-side heat transfer tube of the water-refrigerant heat exchanger in a water heater having a hot-water supply channel formed by connecting water-side heat transfer tubes of a water-refrigerant heat exchanger that performs exchange A water heater characterized by comprising. The water outlet portion vibration means includes a connecting member that connects the vibration component of the water heater and the water outlet portion of the water-side heat transfer tube of the water refrigerant heat exchanger so as to be able to transmit vibrations. The water heater described in 1. 2. The water heater according to claim 1, wherein the water outlet vibration means is a vibration drive unit that is attached to a water outlet of a water-side heat transfer tube of a water refrigerant heat exchanger and vibrates the water outlet. . Inlet water temperature detecting means for detecting the water temperature on the inlet side of the water side heat transfer tube of the water refrigerant heat exchanger, and outlet water for detecting the water temperature on the outlet side of the water side heat transfer tube of the water refrigerant heat exchanger A temperature detecting means; a water flow rate detecting means for detecting a flow speed of water flowing through the water side heat transfer pipe of the water refrigerant heat exchanger; and the detected water temperature on the inlet side of the water side heat transfer pipe and the output water temperature. The hot water heater according to claim 3, further comprising a control means for driving and controlling the vibration driving machine based on a temperature difference with the side water temperature and a water flow velocity. The water heater according to any one of claims 1 to 4, wherein the refrigerant used in the heat pump refrigerant circuit is carbon dioxide.

Images