JP7014699B2 - Water heating system and hot water facility - Google Patents

Description

The present invention relates to a water heating system that heats water using a water heat exchanger of a water heat source air conditioner, and a hot water bath facility using this water heating system.

Various water heating systems (hot water supply systems) that heat water and supply it to the demand for hot water supply have been put into practical use, from small ones for home use to large ones used for accommodation facilities, hot water bath facilities, heated pools, etc. There is. Such a water heating system, especially a water heating system that requires a large amount of hot water such as a hot water facility or a hot water pool, consumes a large amount of fuel, and high efficiency and energy saving are required from the viewpoint of cost and global warming countermeasures. ing.

Further, in relatively large-scale facilities, the use of water heat source air conditioning equipment that exchanges heat with groundwater, river water, etc. is increasing instead of the conventional air conditioning equipment that air-conditions by exchanging heat with the outside air. The groundwater and river water used for heat exchange in this water heat source air-conditioning system are not easily affected by the outside air temperature, and the temperature does not change much throughout the year. Therefore, the water heat source air-conditioning equipment enables stable and highly efficient heat exchange as compared with the conventional air-conditioning equipment. With respect to such water heat source air conditioning equipment, for example, the following [Patent Document 1] discloses an invention relating to miniaturization of water heat source air conditioning equipment.

Japanese Unexamined Patent Publication No. 6-12223

Currently, much research and development is being carried out to improve the efficiency and energy saving of water heating systems. However, there is still room for improvement, and further improvement from various approaches is desired. The present invention has been made in view of the above circumstances, and is a water heating system capable of reducing fuel consumption by heating water using a water heat exchanger of a water heat source air conditioner and a hot water bath using the same. The purpose is to provide facilities .

The present invention
(1) A hot water tank 10 for storing hot water, a water heat source air-conditioning system 40 provided with a water heat exchanger 42 for refrigerant and water, and a heating unit 32 for heating water and supplying it to the hot water tank 10 side. In the water heating system that has
A water receiving tank 30 having a low temperature tank 30b on the upstream side and a high temperature tank 30a on the downstream side and storing water to be supplied to the hot water tank 10 is further provided.
The heating unit 32 supplies water from the high temperature tank 30a side and at the same time.
The water heat exchanger 42 exchanges heat with the water in the high temperature tank 30a by heat exchange during the cooling operation to preheat the water in the high temperature tank 30a and returns the water to the water receiving tank 30. The above problem is solved by providing the water heating system 80a characterized by heating the water supplied to the hot water tank 10 .
( 2 ) When the water temperature of the high temperature tank 30a is equal to or lower than a predetermined high temperature threshold, the water exchanged by the water heat exchanger 42 is returned to the high temperature tank 30a, and the water temperature of the high temperature tank 30a exceeds the high temperature threshold. The above problem is solved by providing the water heating system 80a according to the above ( 1 ), which comprises recirculating the heat-exchanged water to the low temperature tank 30b.
( 3 ) The above ( 1 ) further includes a drainage mechanism (drainage pipe 26, on-off valve 26a) for draining the water in the high temperature tank 30a when the water temperature in the high temperature tank 30a becomes equal to or lower than a predetermined low temperature threshold value. ) Or ( 2 ), the above-mentioned problem is solved by providing the water heating system 80a.
( 4 ) The water heating system 80a according to any one of ( 1 ) to ( 3 ) above, wherein the hot water tank 10 is a bathtub or a hot water storage tank.
It is equipped with a dressing room 12 where users can put on and take off their clothes.
The above-mentioned problem is solved by providing the hot bath facility 100 characterized in that the water heat source air-conditioning equipment 40 air-conditions the dressing room 12 .

The water heating system according to the present invention and the hot water bath facility using the same use water supplied to the hot water tank or water in the hot water tank for heat exchange of the water heat source air conditioning equipment. As a result, when the water heat source air-conditioning system is operated for cooling, these waters are heated, and the fuel consumption can be reduced by that amount, so that the fuel cost can be reduced and the energy can be saved.
In particular, in a configuration in which the water heating system has a water receiving tank equipped with a low temperature tank and a high temperature tank, when the temperature of the water in the high temperature tank exceeds a preset high temperature threshold, the heat exchanged water is used in the low temperature tank. Reflux inward. As a result, the excessive rise in the temperature of the water in the high temperature tank is suppressed to suppress the decrease in the heat exchange efficiency in the water heat exchanger, and the water in the low temperature tank is preheated to exhaust the heat in the water heat exchanger. It can be fully used. Further, when the water heat source air-conditioning system is heated and the temperature of the water in the high temperature tank becomes equal to or lower than the low temperature threshold, the drainage mechanism is operated to discharge the water in the high temperature tank to the outside of the tank. As a result, it is possible to prevent an increase in the load on the heating unit and suppress a decrease in heat exchange efficiency in the water heat exchanger.
Further, in the hot bath facility according to the present invention, the water heat source air conditioning equipment is used for air conditioning in a dressing room where the cooling operation period is long. As a result, the water heating operation by the water heat exchanger can be performed for a long period of time.

It is a schematic block diagram of the hot bath facility using the water heating system which concerns on this invention. It is a schematic block diagram of a sports facility using a water heating system.

The water heating system and the hot water bath facility according to the present invention will be described with reference to the drawings. Here, the water heating system 80 a according to the present invention will be described using a hot water facility 100 equipped with the water heating system 80 a, but the water heating system 80 a according to the present invention is not limited to these facilities. However, it can be applied to the water heating system 80 a of any facility equipped with a water heat source air conditioner.

Here, FIG. 1 is a diagram showing an example in which the water heating system 80a according to the present invention is applied to the hot water bath facility 100. Further, FIG. 2 is a diagram showing an example in which the water heating system 80b is applied to the sports facility 110. First, the water heating system 80a according to the present invention includes a hot water tank 10 for storing hot water, a water heat source air conditioning facility 40 provided with a water heat exchanger 42 for refrigerant and water, and a hot water tank for heating water. It has a heating unit 32 for supplying to the 10 side.

The water heat source air-conditioning equipment 40 includes a compressor 44 that compresses the refrigerant into a high-temperature and high-pressure gas refrigerant, the above-mentioned water heat exchanger 42, and a well-known decompressor 48 such as an expansion valve that depressurizes the refrigerant. It has an indoor unit 46 that exchanges heat between indoor air and a refrigerant to perform air conditioning, and a well-known member such as a four-way valve (not shown) that switches the flow path of the refrigerant. Further, as the heating unit 32, a well-known heating means such as a boiler can be used.

As shown in FIG. 1, the water heating system 80a suitable for the hot bath facility 100 further has a water receiving tank 30 for storing water from the water source 1 in addition to the above configuration. The hot water tank 10 in the water heating system 80a is a bathtub for the user to take a bath or a hot water storage tank for storing hot water having a predetermined temperature. The water receiving tank 30 of the water heating system 80a has a low temperature tank 30b on the upstream side, that is, the water source 1 side, and a high temperature tank 30a on the downstream side, that is, the hot water tank 10 side. The 30b communicates with each other through the communication hole 30c. Therefore, when the amount of water on the high temperature tank 30a side decreases, the water on the low temperature tank 30b side flows into the high temperature tank 30a by that amount, and the water levels of both are maintained substantially the same.

Further, a water supply pipe 3 extending from the water source 1 is connected to the low temperature tank 30b, and the water of the water source 1 is appropriately replenished to the low temperature tank 30b. Although tap water may be used as the water source 1, it is most preferable to use well water (groundwater) whose water temperature does not change significantly throughout the year. When well water is used for the water source 1, a well water pump 5 is connected to the water supply pipe 3, and the water from the water source 1 (well) is pumped up at any time to replenish the low temperature tank 30b. Further, the low temperature tank 30b may be provided with a supply pipe 7 for supplying water in the tank to meet the water demand of a toilet or the like that does not require heating.

Further, the heating pipe 34 that sends the water in the tank to the heating unit 32 side and the preheating pipe 20 that sends the water in the water heat exchanger 42 side are connected to the high temperature tank 30a, and water is sent to the heating pipe 34 and the preheating pipe 20, respectively. Pumps 34a and 22 are connected. Further, the preheating pipe 20 is branched into two recirculation pipes 20a and 20b on the downstream side of the water heat exchanger 42, and these recirculation pipes 20a and 20b are connected to the high temperature tank 30a and the low temperature tank 30b, respectively. Further, the return pipes 20a and 20b are provided with flow path switching means such as on-off valves 24a and 24b and a three-way valve, and the flow path of water from the water heat exchanger 42 is guided to the high temperature tank 30a side by the flow path switching means. And the low temperature tank 30b side can be switched. Further, in the high temperature tank 30a, a well-known temperature acquisition means 23 such as a water temperature gauge for acquiring the temperature of the water in the tank is installed. Further, the high temperature tank 30a is provided with a drainage pipe 26 for draining the water in the tank and a drainage mechanism such as an on-off valve 26a for opening and closing the drainage pipe 26. The drainage mechanism may be directly connected to the high temperature tank 30a or may be provided on the upstream side of the heating pipe 34.

Further, the hot water bath facility 100 according to the present invention has the above -mentioned water heating system 80a and a dressing room 12 where the user puts on and takes off clothes. Then, in the hot bath facility 100 according to the present invention, at least the air conditioning of the dressing room 12 is performed by the indoor unit 46 of the water heat source air conditioning equipment 40. Here, in addition to the heat flowing from the bathroom flowing into the dressing room 12 of the general hot bath facility 100, the cooling operation period is longer than that of the normal indoor air conditioning from the viewpoint of cooling the body of the user after bathing. Since the water heating system 80a according to the present invention preheats the water in the high temperature tank 30a when the water heat source air conditioner 40 cools, the water heat source air conditioner 40 is used for air conditioning of the dressing room 12 having a long cooling operation. By using it, preheating operation can be performed for a longer period than indoor air conditioning.

Next, the operation of the water heating system 80a according to the present invention and the hot water bath facility 100 using the system will be described. First, when the water source 1 is a well, the well water pump 5 is operated to supply the well water to the low temperature tank 30b. The water supplied to the low temperature tank 30b also flows into the high temperature tank 30a through the communication hole 30c, and the water receiving tank 30 reaches a predetermined water level. When the water source 1 is a well, the water temperature supplied does not fluctuate significantly throughout the year and is generally in the range of 15 ° C to 20 ° C.

Further, the temperature of the water in the high temperature tank 30a is acquired by the temperature acquisition means 23 and output to a control unit (not shown). The control unit receives the water temperature from the temperature acquisition means 23, and when the temperature of the water in the high temperature tank 30a is equal to or lower than a preset high temperature threshold value such as 45 ° C., the on-off valve 24a which is a flow path switching means Is in the open state, the on-off valve 24b is in the closed state, and the flow path thereof is on the return pipe 20a side.

Next, when the water heat source air conditioner 40 cools, the compressor 44 compresses the refrigerant into a high-temperature and high-pressure gas refrigerant and sends it to the water heat exchanger 42. Around this time, the water pump 22 operates to send the water in the high temperature tank 30a to the water heat exchanger 42 through the preheating pipe 20. Then, in the water heat exchanger 42, the water in the preheating pipe 20 and the gas refrigerant exchange heat, and the water in the preheating pipe 20 is heated. Further, the gas refrigerant is cooled and condensed to become a liquid refrigerant. The condensed liquid refrigerant is decompressed by the decompressor 48 to become a partially vaporized gas-liquid two-phase refrigerant. Then, this gas-liquid two-phase refrigerant is sent to the indoor unit 46, and in the hot bath facility 100 according to the present invention, heat is exchanged with the air in the dressing room 12 and vaporized. The air cooled by this heat exchange is sent out into the dressing room 12, whereby the inside of the dressing room 12 is cooled. Further, the gas refrigerant vaporized in the indoor unit 46 returns to the compressor 44 and is compressed and discharged again. Further, the water heated by the heat exchange in the water heat exchanger 42 is refluxed to the high temperature tank 30a through the reflux pipe 20a. As a result, the temperature of the water in the high temperature tank 30a rises, and the water in the high temperature tank 30a is preheated.

When the amount of hot water used on the hot water tank 10 side decreases, the water pump 34a operates to send the water in the high temperature tank 30a to the heating unit 32 through the heating pipe 34. Then, it is heated to a preset temperature of, for example, 60 ° C. in the heating unit 32, and is sent to the hot water tank 10 (bathtub, hot water storage tank, etc.). The reduced amount of water in the used high temperature tank 30a is replenished from the low temperature tank 30b through the communication hole 30c.

Further, when the preheating capacity of the water heat exchanger 42 is large with respect to the amount of hot water used in the hot water tank 10 and the temperature of the water in the high temperature tank 30a rises beyond the high temperature threshold value, the control unit uses this as a temperature acquisition means. The on-off valve 24a as the flow path switching means is closed and the on-off valve 24b is opened by detecting through the 23. As a result, the water flow path is switched to the return pipe 20b side, the water heated by the water heat exchanger 42 is returned to the low temperature tank 30b to preheat the water in the low temperature tank 30b, and the inside of the low temperature tank 30b. Water flows into the high temperature tank 30a to lower the temperature of the water in the high temperature tank 30a and suppress an excessive temperature rise. This prevents the heat exchange efficiency of the water heat exchanger 42 from deteriorating, and the water in the low temperature tank 30b is preheated so that the waste heat of the water heat exchanger 42 can be fully utilized.

Next, when the water heat source air-conditioning equipment 40 is heated, the high-temperature and high-pressure gas refrigerant compressed by the compressor 44 is sent to the indoor unit 46. Then, in the hot bath facility 100 according to the present invention, heat is exchanged with the air in the dressing room 12 to heat the air in the dressing room 12. The heated air is sent into the dressing room 12, thereby heating the dressing room 12. Further, this heat exchange cools the gas refrigerant and condenses it into a liquid refrigerant. This liquid refrigerant is decompressed by the decompressor 48 and becomes a partially vaporized gas-liquid two-phase refrigerant. Then, this gas-liquid two-phase refrigerant exchanges heat with the water in the preheating pipe 20 in the water heat exchanger 42 and vaporizes. Then, the gas refrigerant vaporized by the water heat exchanger 42 returns to the compressor 44 and is compressed and discharged again.

Further, the temperature of the water in the preheating pipe 20 is lowered by the heat exchange during the heating operation in the water heat exchanger 42. Then, this water is refluxed to the high temperature tank 30a through the reflux pipe 20a, whereby the temperature of the water in the high temperature tank 30a is lowered. This works in the direction of increasing the load of the heating unit 32. Therefore, in the water heating system 80a according to the present invention, when the temperature of the water in the high temperature tank 30a drops to be equal to or lower than the preset low temperature threshold value, the control unit detects this via the temperature acquisition means 23. The on-off valve 26a as a drainage mechanism is opened, and the water in the high temperature tank 30a is discharged to the outside of the tank through the drainage pipe 26. As a result, water flows into the high temperature tank 30a from the low temperature tank 30b through the communication hole 30c and is replenished. As a result, the temperature of the water in the high temperature tank 30a rises to the temperature of the water in the low temperature tank 30b, preventing an increase in the load of the heating unit 32 and suppressing a decrease in the heat exchange efficiency in the water heat exchanger 42. .. When well water is used as the water source 1, even if the water in the high temperature tank 30a is drained, the refilling cost is small, and the drainage does not significantly increase the operating cost.

Next , the water heating system 80b will be described with reference to FIG. In FIG. 2, a sports facility 110 having an exercise area 13 and a heated pool as a hot water tank 10 will be described as an example, but the water heating system 80b is not limited to this, and includes the exercise area 13. It may be applied to a non-heated pool or a circulation type hot water facility. In this case, the water heat source air-conditioning equipment 40 performs changing rooms, dressing rooms, and other air-conditioning.

The water heating system 80b shown in FIG. 2 has a hot water tank 10 as a hot water pool, a water heat source air-conditioning equipment 40, and a heating unit 32. Then, the circulation pipe 50 is connected to the hot water tank 10 as the hot water pool. Further, the circulation pipe 50 includes a water supply pump 50a for flowing hot water in the hot water tank 10 into the circulation pipe 50, a temperature acquisition means 51 for acquiring the temperature of the hot water in the hot water tank 10, a filter and a filtration device. A water purification unit 52 such as a sterilizer, a heating pipe 56 connecting the circulation pipe 50 and the water heat exchanger 42, and the above-mentioned heating unit 32 are connected. Further, the circulation pipe 50 has a bypass pipe 58 connecting both ends of the heating pipe 56 and an on-off valve 58a for opening and closing the bypass pipe 58. Further, the circulation pipe 50 includes a drainage pipe (not shown) for draining the hot water in the hot water tank 10 and a water supply pipe (not shown) for appropriately replenishing the water of the water source including tap water to the hot water tank 10. You may have it.

Further , the water heating system 80b includes a well-known heat exchange means 60 such as a cooling tower, and also has a heat exchange pipe 62 that branches from the heating pipe 56 and is connected to the heat exchange means 60, and the heating pipe 56 or the heat exchange. It has a water supply pump 57 for flowing water into the pipe 62, and on-off valves 56a and 62a as flow path switching means provided in the heating pipe 56 and the heat exchange pipe 62, respectively. The flow path switching means switches the flow path of water used for heat exchange in the water heat exchanger 42 between the hot water tank 10 side (heating pipe 56 side) and the heat exchange means 60 side (heat exchange pipe 62 side). If this operation is possible, a well-known member such as a three-way valve may be used.

Further , the sports facility 110 has the above -mentioned water heating system 80b and an exercise area 13 such as a training gym or an aerobics studio. Then , in the sports facility 110, at least the air conditioning of the exercise area 13 is performed by the indoor unit 46 of the water heat source air conditioning equipment 40. Here, in the exercise area 13, the period of the cooling operation is longer than that of the normal indoor air conditioning from the viewpoint of cooling the body of the user during exercise. Since the water heating system 80b heats the water in the hot water tank 10 (hot water pool) when the water heat source air conditioner 40 cools, the water heat source air conditioner 40 is used for air conditioning in the exercise area 13 where the cooling operation period is long. By using, the heating operation can be performed for a longer period than the indoor air conditioning.

Next , the operation of the water heating system 80b and the sports facility 110 using the water heating system 80b will be described. First, a predetermined amount of hot water heated to a predetermined temperature is stored in the hot water tank 10 as a heated pool. At this time, the water pump 50a of the water heating system 80b operates to pump the water in the hot water tank 10 into the circulation pipe 50. The water in the hot water tank 10 pumped into the circulation pipe 50 is subjected to a predetermined sterilization treatment or the like while the impurities such as hair and dust are removed in the water purification unit 52. Further, the temperature acquisition means 51 acquires the temperature of the water supplied in the circulation pipe 50 and outputs it as the temperature of the water in the hot water tank 10 to a control unit (not shown). When the control unit receives the water temperature from the temperature acquisition means 51 and the temperature of the water in the hot water tank 10 is below a preset high temperature threshold value such as 30 ° C. and the water heat source air conditioner 40 is in cooling operation. The on-off valve 58a is closed to close the bypass pipe 58, the on-off valve 56a as the flow path switching means is opened, and the on-off valve 62a is closed. As a result, the water that has passed through the water purification unit 52 flows down the heating pipe 56 side.

Further, when the water heat source air-conditioning equipment 40 cools, the compressor 44 compresses the refrigerant into a high-temperature and high-pressure gas refrigerant and sends it to the water heat exchanger 42. Further, as described above, the water in the circulation pipe 50 flows down the heating pipe 56 and is sent to the water heat exchanger 42. Then, in the water heat exchanger 42, the water in the heating pipe 56 and the gas refrigerant exchange heat, and the water in the heating pipe 56 is heated. Further, the gas refrigerant is cooled and condensed to become a liquid refrigerant. This condensed liquid refrigerant is decompressed by the decompressor 48 to become a partially vaporized gas-liquid two-phase refrigerant. Then, this gas-liquid two-phase refrigerant is sent to the indoor unit 46, and at the sports facility 110, it exchanges heat with the air in the exercise area 13 and vaporizes. The air cooled by this heat exchange is sent out into the motion area 13, whereby the cooling in the motion area 13 is performed. Further, the gas refrigerant vaporized in the indoor unit 46 returns to the compressor 44 and is compressed and discharged again. Further, the water heated by the heat exchange in the water heat exchanger 42 returns to the hot water tank 10. As a result, the water in the heated pool as the heated water tank 10 is heated.

Further, when the temperature of the water in the hot water tank 10 exceeds the high temperature threshold value in summer or the like, the control unit detects this via the temperature acquisition means 51 and closes the on-off valve 56a as the flow path switching means. At the same time, the on-off valve 58a is opened to open the bypass pipe 58. Further, the on-off valve 62a as the flow path switching means is opened and the water pump 57 is operated. As a result, the water in the circulation pipe 50 flows down the bypass pipe 58 and returns to the hot water tank 10 without passing through the heating pipe 56. Further, the water used for heat exchange in the water heat exchanger 42 is sent to the heat exchange means 60 by the water supply pump 57 to be cooled, and then used again for heat exchange with the refrigerant in the water heat exchanger 42. .. As a result, the hot water tank 10 and the water heat exchanger 42 are separated, and the heating to the hot water tank 10 is stopped.

When the water heat source air-conditioning equipment 40 is in the heating operation, the control unit closes the on-off valve 56a as the flow path switching means and opens the on-off valve 58a to open the bypass pipe 58 as described above. do. Further, the on-off valve 62a as the flow path switching means is opened and the water pump 57 is operated. As a result, the hot water tank 10 and the water heat exchanger 42 are separated, the water cooled by the water heat exchanger 42 during the heating operation is warmed by the heat exchange means 60, and is again used as the refrigerant in the water heat exchanger 42. Used for heat exchange.

Further, during the heating operation of the water heat source air conditioner 40 or when the temperature of the water in the hot water tank 10 does not reach a predetermined low temperature threshold only by heating by heat exchange of the water heat exchanger 42, the control unit performs the temperature acquisition means 51. This is detected via the above, and the heating unit 32 is operated. As a result, the water in the circulation pipe 50 is heated by the heating unit 32, whereby the water in the hot water tank 10 is maintained in a preset temperature range.

If the facility equipped with the water heating systems 80a and 80b has a cogeneration power generation facility or the like, this waste heat may also be used for heating the water in the high temperature tank 30a or the hot water tank 10. .. Further, the residual heat of the heating unit 32 may be used in cascade for heating the water in the high temperature tank 30a or the hot water tank 10. Further, when the facility has a freezing / refrigerating facility or the like, these waste heats may also be used for heating the water in the high temperature tank 30a or the hot water tank 10.

As described above, the water heating system 80a and the hot water bath facility 100 using the water heating system 80a according to the present invention use the water stored in the water receiving tank 30 for heat exchange of the water heat source air conditioning equipment 40. As a result, when the water heat source air conditioner 40 is in cooling operation, the water in the water receiving tank 30 is preheated by heat exchange in the water heat exchanger 42, and the load on the heating unit 32 in the subsequent stage can be reduced. This makes it possible to reduce fuel consumption, reduce fuel costs, and save energy.

Further, in the water heating system 80a and the hot water bath facility 100 according to the present invention, the water receiving tank 30 is divided into a high temperature tank 30a and a low temperature tank 30b, and under normal conditions, the water in the high temperature tank 30a on the hot water tank 10 side is used for heat exchange. Preheat the water in the high temperature tank 30a. However, when the temperature of the water in the high temperature tank 30a exceeds a preset high temperature threshold value, the heat exchanged water is refluxed into the low temperature tank 30b. As a result, the excessive rise in the temperature of the water in the high temperature tank 30a is suppressed to suppress the decrease in the heat exchange efficiency in the water heat exchanger 42, and the water in the low temperature tank 30b is preheated in the water heat exchanger 42. It is possible to fully utilize the waste heat of.

Further, in the water heating system 80a and the hot water bath facility 100 according to the present invention, when the water heat source air conditioning equipment 40 is heated and the temperature of the water in the high temperature tank 30a becomes equal to or lower than the low temperature threshold, the drainage mechanism is operated to increase the temperature. The water in the tank 30a is discharged to the outside of the tank. As a result, the temperature of the water in the high temperature tank 30a rises to the temperature of the water in the low temperature tank 30b, preventing an increase in the load of the heating unit 32 and suppressing a decrease in the heat exchange efficiency in the water heat exchanger 42. be able to.

Further , the water heating system 80b and the sports facility 110 using the water heating system 80b use the water in the hot water tank 10 (heated pool) for heat exchange of the water heat source air conditioning equipment 40. As a result, when the water heat source air conditioner 40 is in cooling operation, the water in the hot water tank 10 is heated by heat exchange in the water heat exchanger 42. This makes it possible to reduce fuel consumption, reduce fuel costs, and save energy. Further , in the water heating system 80b and the sports facility 110, when the temperature of the water in the hot water tank 10 rises beyond the high temperature threshold, or when the heating operation is performed, the water flow path used for heat exchange by the water heat exchanger 42. Is switched to the heat exchange means 60 side. As a result, the hot water tank 10 and the water heat exchanger 42 are separated, the heating to the hot water tank 10 is stopped, and the heat exchange of the water heat source air conditioning equipment 40 is between the water heat exchanger 42 and the heat exchange means 60. It is done in.

Further, in the hot bath facility 100 according to the present invention, the indoor unit 46 of the water heat source air conditioner 40 is used for air conditioning of the dressing room 12 which has a long cooling operation period. As a result, the heating operation by the water heat exchanger 42 can be performed for a long period of time.

Since the configurations, mechanisms, shapes, dimensions, operations, piping routes, etc. of each part of the water heating systems 80a and 80b, the hot water facility 100, and the sports facility 110 shown in this example are examples, the present invention is particularly limited to this example. However, the present invention can be modified and implemented without departing from the gist of the present invention.

10 Hot water tank
12 Dressing room
13 Exercise area
30 Water receiving tank
30a high temperature bath
30b low temperature tank
32 Heating unit
40 Water heat source air conditioning equipment
42 water heat exchanger
60 Heat exchange means
80a, 80b water heating system
100 hot bath facilities
110 sports facilities

Claims (4)

A hot water tank for storing hot water and
A water heat source air conditioner equipped with a water heat exchanger between the refrigerant and water,
In a water heating system having a heating unit that heats water and supplies it to the hot water tank side.
It has a low temperature tank on the upstream side and a high temperature tank on the downstream side, and is further equipped with a water receiving tank for storing water to be supplied to the hot water tank.
The heating unit supplies water from the high temperature tank side and at the same time
The water heat exchanger exchanges heat with the water in the high temperature tank by heat exchange during cooling operation to preheat the water in the high temperature tank and returns it to the water receiving tank to supply the water to the hot water tank. A water heating system characterized by heating the water to be heated. When the water temperature in the high temperature tank is equal to or lower than a predetermined high temperature threshold, the water exchanged by the water heat exchanger is returned to the high temperature tank, and when the water temperature in the high temperature tank exceeds the high temperature threshold, the heat exchanged water is performed. The water heating system according to claim 1 , wherein the water is returned to a low temperature bath. The water heating system according to claim 1 or 2 , further comprising a drainage mechanism for draining the water in the high temperature tank when the water temperature in the high temperature tank becomes equal to or lower than a predetermined low temperature threshold value. The water heating system according to any one of claims 1 to 3 , wherein the hot water tank is a bathtub or a hot water storage tank.
Equipped with a dressing room where users can put on and take off their clothes
A hot bath facility characterized in that the water heat source air conditioning equipment air-conditions the dressing room.

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