JP2012112618A - Hot spring water supply system and method of supplying hot spring water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot spring water supply system capable of accommodating user-side load change without increasing a hot water storage tank.SOLUTION: The hot spring water supply system 1 includes the hot water storage tank 17 for storing hot spring water, and a heat pump 3 for heating the hot spring water stored in the hot water storage tank 17, and the heat pump 3 is operated so that a hot water storage temperature of hot spring water in the hot water storage tank 17 reaches 60°C or more which is higher than a hot water distribution temperature (for example, 47°C) necessary to obtain the hot spring water temperature required by a user side such as a spring inn and the like.

Description

  The present invention relates to a hot spring water supply system and a hot spring water supply method.

FIG. 3 shows a conventional hot spring water supply system. The hot spring water supply system 100 includes a hot water storage tank 102 that stores hot spring water guided from a source spring. The hot spring water in the hot water storage tank 102 can be heated by the boiler 104.
Further, a cold spring tank 106 in which hot spring water (cold spring) having a temperature lower than that of the source spring is stored is provided, and the hot spring water in the hot water storage tank 102 can be cooled by supplying the cold spring from the cold spring tank 106. It is like that.
The hot spring water in the hot water storage tank 102 is adjusted to a predetermined hot water storage temperature by heating by the boiler 104 or hydration cooling by the cold spring tank 106. And the hot spring water in the hot water storage tank 102 is supplied with respect to the use side, such as a hot spring inn. That is, the hot water stored in the hot water storage tank 102 is directly supplied to the user side as the hot water distribution temperature for distributing hot water in the hot water storage tank 102 to the user side.
In FIG. 3, reference numeral 108 denotes a circulating hot water supply pipe for returning and circulating the excess hot water distribution.

  On the other hand, the following Patent Document 1 and Patent Document 2 disclose examples in which a heat pump is used to heat and adjust the temperature of hot spring water in a hot spring bathtub.

JP 2010-60185 A JP-A-60-114654

  As described above, the hot spring water supply system 100 shown in FIG. 3 directly supplies (distributes) hot spring water in the hot water storage tank 102 to the user side, so that the hot water storage tank capacity is directly used as the hot water distribution capacity. Therefore, when a load fluctuation on the use side occurs, it cannot be flexibly handled, and a large-capacity hot water storage tank 102 in consideration of the assumed maximum load must be provided.

  On the other hand, as in each of the above patent documents, it is preferable to use a heat pump for heating hot spring water because CO2 is less emitted and higher efficiency than a boiler or the like. However, the heating temperature of the hot spring water disclosed in each patent document is premised on a temperature suitable for bath water, and is about 43 ° C. at most. Further, each patent document does not mention any hot water storage temperature of the hot spring water supply system.

  This invention is made | formed in view of such a situation, Comprising: The hot spring water supply system and hot spring water supply method which can be made to respond | correspond to the load fluctuation of a utilization side without accompanying the increase in a hot water storage tank are provided. For the purpose.

In order to solve the above problems, the hot spring water supply system and the hot spring water supply method of the present invention employ the following means.
That is, the hot spring water supply system according to the present invention includes a hot water storage tank in which hot spring water is stored, and a heat pump that heats the hot spring water stored in the hot water storage tank, and the heat pump includes the hot spring in the hot water storage tank. The hot water storage temperature of the water is operated so as to be higher than the hot water distribution temperature necessary for obtaining the hot spring water temperature required by the user.

Hot spring water stored in the hot water tank is heated by a heat pump. The heat pump is operated such that the hot water storage temperature is higher than the hot water supply temperature (for example, 47 ° C.) necessary for obtaining the hot spring water temperature (for example, 43 ° C.) required by the user side of the hot spring inn or the like. Thereby, the hot water storage temperature can be made higher than the hot water distribution temperature, and the effective heat capacity of the hot spring water stored in the hot water storage tank ((hot water storage temperature−hot water distribution temperature) × hot water storage amount) can be increased. Therefore, the effective heat capacity of the hot spring water in the hot water tank can be changed in accordance with the amount of temperature rise by the heat pump, and the load fluctuation on the use side can be appropriately handled without increasing the hot water tank.
In addition, as for the hot water storage temperature after heating with a heat pump, 60 degreeC or more (for example, 65 degreeC) from which Legionella genus microbe kills is preferable.
The heat pump typically includes a turbo refrigerator using a turbo compressor, but may be another vapor compression heat pump using a screw type or scroll type compressor, or an absorption type refrigerator. Other formats may be used.

  Furthermore, in the hot spring water supply system of the present invention, the heat pump is intermittently operated.

  Since the effective heat capacity of the hot spring water in the hot water storage tank can be increased by increasing the difference between the hot water storage temperature and the hot water distribution temperature, the amount of the hot spring water used can be reduced. This eliminates the need to heat the hot spring water by continuously operating the heat pump, and enables intermittent operation. By enabling intermittent operation, it is possible to operate using only nighttime power, which is less expensive than daytime.

  Furthermore, the hot spring water supply system of the present invention includes a cold spring tank that stores hot spring water having a temperature lower than the hot water distribution temperature, and uses the hot spring water in the cold spring tank as heat source water for the heat pump. Features.

When the heat pump is operated, the heat source water having the required heat capacity may not be secured. Therefore, in the present invention, a cold spring tank that stores hot spring water led from the source spring is provided, and the hot spring water in the cold spring tank is used as the heat source water of the heat pump. Since the heat pump is intermittently operated, the amount of hot spring water in the cold spring tank can be increased during a time period when the heat pump is not operating, and the amount of heat source water necessary for operating the heat pump can be ensured.
Moreover, considering that the cold spring water stored in the cold spring tank is used as heat source water, it is sufficient if it is 10 ° C. or higher. Therefore, since the cold spring water whose temperature is lower than the hot water distribution temperature and whose utility value is thermally low can be used as the heat source water, effective use of the source water can be achieved.

  Furthermore, in the hot spring water supply system of the present invention, the hot spring water after being used as the heat source water of the heat pump is guided to a cooling load.

  The hot spring water after being used as the heat source water of the heat pump is absorbed by the heat pump to lower the temperature, and is cooled to, for example, 5 to 10 ° C. The hot spring water cooled in this way may be discharged as it is, but in the present invention, it is led to a cooling load and the cold is used. Thereby, the cold heat of heat source water can be used effectively.

  Moreover, the hot spring water supply method of the present invention provides hot spring water supply using a hot spring water supply system including a hot water storage tank in which hot spring water is stored and a heat pump that heats the hot spring water stored in the hot water storage tank. In the method, the heat pump is operated so that the hot water temperature of the hot water in the hot water tank is higher than a hot water temperature required to obtain the hot water temperature required by the user. Features.

Hot spring water stored in the hot water tank is heated by a heat pump. The heat pump is operated such that the hot water storage temperature is higher than the hot water supply temperature (for example, 47 ° C.) necessary for obtaining the hot spring water temperature (for example, 43 ° C.) required by the user side of the hot spring inn or the like. Thereby, the hot water storage temperature can be made higher than the hot water distribution temperature, and the effective heat capacity of the hot spring water stored in the hot water storage tank ((hot water storage temperature−hot water distribution temperature) × hot water storage amount) can be increased. Therefore, the effective heat capacity of the hot spring water in the hot water tank can be changed in accordance with the amount of temperature rise by the heat pump, and the load fluctuation on the use side can be appropriately handled without increasing the hot water tank.
In addition, as for the hot water storage temperature after heating with a heat pump, 60 degreeC or more (for example, 65 degreeC) from which Legionella genus microbe kills is preferable.
The heat pump typically includes a turbo refrigerator using a turbo compressor, but may be another vapor compression heat pump using a screw type or scroll type compressor, or an absorption type refrigerator. Other formats may be used.

  According to the present invention, the heat pump is operated so that the hot water temperature of the hot spring water in the hot water tank is higher than the hot water distribution temperature required to obtain the hot spring water temperature required by the user. Therefore, the effective heat capacity of the hot spring water in the hot water tank can be changed according to the amount of temperature rise by the heat pump, and the load fluctuation on the use side can be appropriately handled.

It is the schematic block diagram which showed the hot spring water supply system concerning one Embodiment of this invention. It is the graph which showed the hot spring water supply system driving | running pattern of FIG. It is the schematic block diagram which showed the conventional hot spring water supply system.

Embodiments according to the present invention will be described below with reference to the drawings.
FIG. 1 shows a hot spring water supply system 1.
The hot spring water supply system 1 includes a heat pump 3, a hot water receiving tank 5 that stores the hot spring water from which the source spring is guided, a hot water storage tank 17 that stores the hot spring water heated by the heat pump 3, and a temperature lower than the hot water distribution temperature. And a cold spring tank 19 for storing the generated hot spring water.

  There are several hot springs in the hot spring area, each of which has a different temperature. In the present embodiment, a plurality of source springs are appropriately combined, for example, a low temperature source group that obtains a relatively low temperature hot spring water, for example, about 25 ° C., and a high temperature source group that obtains a relatively high temperature hot spring water, eg, 45 ° C. or higher. And form. Of course, the low temperature source group and the high temperature source group may be composed of a single source. The low temperature source group is supplied to the hot water storage tank 19, and the hot spring water from the high temperature source group is supplied to the hot water receiving tank 5. However, a part of the source water derived from the high temperature source group is supplied to the cold spring tank 19. This is for increasing the temperature of the hot spring water in the cold spring tank 19 and increasing the efficiency of the heat pump 3.

The heat pump 3 is a turbo refrigerator. Although not shown, the turbo refrigerator includes a turbo compressor that compresses the refrigerant, a condenser that condenses the refrigerant compressed by the turbo compressor, an expansion valve that expands the condensed liquid refrigerant, and an expanded refrigerant. And an evaporator for evaporating.
The heat pump 3 typically includes a turbo refrigerator using a turbo compressor as in the present embodiment, but other vapor compression heat pumps using a screw type or scroll type compressor. Alternatively, other types such as an absorption refrigerator may be used.

The hot water flowing from the hot water inlet nozzle 3a is heated by the condensation heat that dissipates heat when the refrigerant condenses in the condenser. The heated warm water flows out from the warm water outlet nozzle 3 b and is guided by the warm water pump 9 to the heat transfer pipe 17 a installed in the hot water tank 17.
The temperature of the hot water flowing out from the hot water outlet nozzle 3b (that is, the output hot water temperature of the heat pump 3) is set to, for example, 70 ° C. so that the hot spring water heated by the heat transfer tube 17a is 60 ° C. or higher. Thus, the hot spring water is heated to 60 ° C. or higher (for example, 65 ° C.), so that Legionella bacteria existing in the hot spring water are sterilized.

The cold water flowing from the cold water inlet nozzle 3c is cooled by the evaporation heat that absorbs heat when the refrigerant evaporates in the evaporator. The cooled cold water flows out from the cold water outlet nozzle 3 d and is guided to the hot spring heat exchanger 7 by the cold water pump 11.
In the hot spring heat exchanger 7, cold spring water (heat source water) introduced from the cold spring water inflow pipe 15 a by the cold spring water pump 21 and cold water introduced by the cold water pump 11 are subjected to heat exchange. The heat-exchanged cold spring water is returned to the cold spring tank 19 through the cold spring water outflow pipe 15b.

  The heat pump 3 is operated intermittently, and is preferably controlled to operate using only nighttime power as described later. Of course, it is good to drive in the daytime, but it is preferable to drive at night because cheap electricity charges can be used.

Hot spring water is supplied to the hot water tank 17 from the cold spring tank 19 through a hot spring water supply pipe 29 provided with a hot spring water supply pump 31.
In the hot water tank 17, the hot spring water is heated to 60 ° C. or higher (for example, 65 ° C.) by the hot water heated to 70 ° C. by the heat pump 3. Specifically, the hot water passes through the heating heat transfer pipe 17 a installed in the hot water storage tank 17 by the hot water pump 9, whereby the hot spring water in the hot water storage tank 17 is heated. The hot spring water in the hot water tank 17 is heated to 60 ° C. or higher to sterilize Legionella spp. And stored in a state of maintaining a high temperature of 60 ° C. or higher.
The hot water storage tank 17 is provided with a hot water storage output pipe 23. The hot water storage output pipe 23 is connected to a hot water supply pipe 25 via a hot water supply three-way valve 24. The opening of the hot water supply three-way valve 24 is not shown so that the hot water temperature obtained by joining the hot spring water guided from the hot water receiving tank 5 and the hot water stored in the hot water storage tank 17 becomes a desired value. It is controlled by the control unit. The hot water supply temperature is determined according to the hot spring water temperature required by the user of the hot spring inn (eg, 43 ° C.), and is slightly increased (eg, 47 ° C.) in consideration of heat loss when flowing through the hot water supply pipe 25. Is set.
Reference numeral 26 denotes a circulating hot water supply pipe for returning the surplus hot water supply to the hot water receiving tank 5 for circulation.

The cold spring water stored in the cold spring tank 19 is led to the hot spring heat exchanger 7 by the cold spring water pump 21 as heat source water. The cold spring water that has been absorbed by the hot spring heat exchanger 7 and absorbed heat is led to the cold spring water three-way valve 27, and a part of the hot spring water is returned to the upstream side of the cold spring water pump 21. The rest of the fountain water is directed to a discharge or cooling load.
The cold spring tank 19 is provided with a cold spring output pipe 29 that guides the hot spring water in the cold spring tank 19 to the hot water storage tank 17. The cold spring output pipe 29 is provided with a hot spring water supply pump 31 having a flow rate control valve, and the opening degree of the flow rate control valve is controlled by a control unit (not shown). The opening degree of the cold spring water three-way valve 27 is controlled by a control unit (not shown) so that the cold spring water inflow temperature flowing into the hot spring heat exchanger 7 has a desired value. Moreover, when returning the cold spring water which flows out from the hot spring heat exchanger 7 to the cold spring tank 19, if the outflow temperature from the hot spring heat exchanger 7 falls, the temperature in the cold spring tank 19 will fall and the efficiency of the heat pump 3 will fall. However, here, it does not return to the cold spring tank 19 but discharges it through the cold spring water three-way valve 27 to prevent the efficiency of the heat pump from decreasing. Moreover, it is good also as using the cold heat | fever (for example, 5-10 degreeC) of cold spring water effectively by making it flow to a cooling load, without discharging.
When the hot spring water stored in the cold spring tank 19 exceeds a certain level, the hot spring water is overflowed and discharged out of the system.

Next, the hot spring water supply system 1 having the above configuration is used as follows.
The hot spring water led from the high temperature source group is supplied to the hot water receiving tank 5 and stored. A part of the source water led from the high temperature source group is led to the cold spring tank 19. The hot spring water led from the low temperature source group is supplied to the cold spring tank 19 and stored therein.
Part of the hot spring water stored in the cold spring tank 19 is guided to the hot water tank 17 through the hot spring water supply pipe 29 by the hot spring water supply pump 31 and stored. The hot spring water in the hot water tank 17 is heated to 60 ° C. or higher by the operation of the heat pump 3.

  As shown in FIG. 2 (a), the heating operation by the heat pump 3 is performed from midnight to 3:00, and the heat radiation operation is performed from 3:00 to midnight, which is the other time zone. That is, from 3 o'clock to midnight, the hot spring water is kept warm in the hot water storage tank 17 without heating, and the hot spring water is discharged to the hot water supply three-way valve 24 through the hot water storage output pipe 23. To do. Therefore, as shown in FIG. 2B, the amount of stored hot water gradually decreases in the time zone from 3:00 to midnight. Then, at midnight, the hot spring water supply pump 31 is operated to increase the amount of hot water stored, and the hot spring water is guided from the cold spring tank 19 to the hot water tank 17, and the temperature of the hot spring water in the hot water tank 17 is lowered accordingly. In order to compensate for this, the heat pump 3 is operated and the hot spring water in the hot water tank 17 is heated. In the time zone from midnight to 3 o'clock, the amount of hot water stored in the hot water tank 17 increases as shown in FIG. 2 (b), and the amount of cold spring water in the cold spring tank 19 as shown in FIG. 2 (c). Decrease. The decrease in the amount of cold spring water is due to the supply of cold spring water to the hot water tank 17, and is used as a heat source water in the hot spring heat exchanger 7 and discharged to the cooling load through the three-way valve 27 for cold spring water. Also included. The decreased amount of cold spring water is gradually compensated in the time zone from 3 o'clock to midnight as shown in FIG.

  The hot spring water having a temperature of 60 ° C. or higher in the hot water storage tank 17 is merged with the hot spring water guided from the hot water receiving tank 5 by the hot water distribution three-way valve 24 to a desired hot water distribution temperature (for example, 47 ° C.). After adjustment, it is supplied to the user side of hot spring inns.

As described above, according to the present embodiment, the following operational effects are obtained.
The hot spring water stored in the hot water tank 17 is heated to 60 ° C. or higher by the heat pump 3 and the hot water distribution temperature (eg, 47 ° C.) required to obtain the hot spring water temperature (eg, 43 ° C.) required by the user side of the hot spring inn or the like. ℃)). Thereby, the hot water storage temperature can be made higher than the hot water distribution temperature, and the effective heat capacity of the hot spring water stored in the hot water storage tank 17 ((hot water storage temperature−hot water distribution temperature) × hot water storage amount) can be increased. Therefore, the effective heat capacity of the hot spring water in the hot water tank can be changed according to the amount of temperature rise by the heat pump 3, and the load fluctuation on the use side can be appropriately dealt with without increasing the hot water tank 17.

Since the effective heat capacity of the hot spring water in the hot water tank 17 can be increased by increasing the difference between the hot water storage temperature and the hot water distribution temperature, the amount of the hot spring used can be reduced. Thereby, it is not necessary to operate the heat pump 3 continuously to heat the hot spring water, and an intermittent operation is possible. By enabling intermittent operation, it is possible to operate using only nighttime power, which is less expensive than daytime.
Further, since the effective heat capacity of the hot spring water in the hot water tank 17 can be increased to reduce the amount of the source spring used, it becomes a measure for preventing the source exhaustion.

When the heat pump 3 is operated, heat source water having a required heat capacity may not be secured. However, a cold spring tank 19 for storing hot spring water led from the source is provided, and the cold spring water in the cold spring tank 19 is heat pumped. 3 was used as heat source water. Since the heat pump 3 is intermittently operated, the amount of cold spring water in the cold spring tank 19 can be increased during a time period when the heat pump 3 is not operating, and the amount of heat source water necessary for the operation of the heat pump 3 can be ensured.
Further, considering that the cold spring water stored in the cold spring tank 19 is used as heat source water, 10 ° C. or more is sufficient. Therefore, since the cold spring water whose temperature is lower than the hot water distribution temperature and whose utility value is thermally low can be used as the heat source water, effective use of the source water can be achieved.

  Moreover, since hot spring water is heated to 60 degreeC with the heat pump 3, compared with the boiler which uses a fossil fuel, it can be heated with high efficiency, without discharging | emitting CO2.

In the present embodiment, the hot spring heat exchanger 7 is used. This is because impurities contained in the hot spring water may become a scale and clog the heat exchanger, so that it can be removed or replaced for maintenance or the like. As a basic form, a hot spring heat exchanger (not shown) is also used between the heat pump 3 and the hot water tank 17, but there is no risk of scale generation depending on the hot spring water quality. In the same manner as the pipe connection between the heat pump 3 and the hot water tank 17, the hot spring heat exchanger 7 is omitted, and the cold spring water inlet pipe 15a and the cold spring water outlet pipe 15b are respectively connected to the cold water inlet nozzle 3c and the cold water outlet nozzle 3d. You may connect directly to.
In addition, as shown in FIG. 2, the heating operation may be performed only at night, but the heating operation may be performed during the day according to the demand on the use side.

DESCRIPTION OF SYMBOLS 1 Hot spring water supply system 3 Heat pump 5 Hot water tank 17 Hot water tank 19 Cold spring tank

Claims (5)

A hot water tank where hot spring water is stored,
A heat pump for heating the hot spring water stored in the hot water tank;
With
The heat pump is operated so that the hot water temperature of the hot water in the hot water tank is higher than the hot water temperature required to obtain the hot water temperature required by the user. Supply system.   The hot water supply system according to claim 1, wherein the heat pump is intermittently operated. A cold spring tank for storing hot spring water that is lower than the hot water distribution temperature,
The hot spring water supply system according to claim 2, wherein hot spring water in the cold spring tank is used as heat source water of the heat pump.   The hot spring water supply system according to claim 3, wherein the hot spring water after being used as heat source water of the heat pump is led to a cooling load. A hot spring water supply method using a hot spring water supply system comprising: a hot water storage tank in which hot spring water is stored; and a heat pump that heats the hot spring water stored in the hot water storage tank,
The heat pump is operated so that the hot water temperature of the hot water in the hot water tank is higher than the hot water temperature required to obtain the hot water temperature required by the user. Supply method.

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