JP2008122032A - Hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supply system greatly contributing to energy saving by reducing the operation frequency of an antifreezing device. <P>SOLUTION: The hot water supply system comprises a discharge conduit 34 extending from the upper part of a hot water storage tank 6 to discharge expanded water produced by boiling-up of the hot water storage tank 6. The discharge conduit 34 has a heat radiating region 38 in part to release the heat of the expanded water into a tank 4 to raise the temperature of an atmosphere in the tank 4. The temperature rise reduces the operation frequency of antifreezing heaters 22 provided at a water supply conduit 8 and a hot water supply conduit 14. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hot water supply system equipped with a hot water storage tank.

  This type of hot water supply system includes a hot water storage tank housed in a tank cabinet, and the water supplied to the hot water storage tank through the water supply pipe is supplied to a heat pump unit (Patent Document 1), a heater (Patent Document 2), and the like. It can heat to a desired boiling temperature with a heating device. The hot water in the hot water storage tank is mixed with the low temperature hot water in the process of being led to the hot water outlet outside the tank through the hot water supply pipe, adjusted to a desired hot water temperature, and supplied from the hot water outlet.

Further, the hot water supply system is further provided with antifreeze heaters (FIG. 1 of Patent Document 1) to which water supply pipes and hot water supply pipes in the tank storage are respectively attached in consideration of use in winter and cold regions. These anti-freezing heaters prevent the freezing of the water staying in the water supply pipes and hot water supply pipes by energizing heat when the outside air, that is, the atmospheric temperature in the tank chamber is lowered below a predetermined temperature.
JP 2004-271102 A JP 2005-147538 A

The anti-freezing heater disclosed in Patent Document 1 described above is such that once the atmospheric temperature in the tank chamber becomes equal to or lower than a predetermined temperature, energization and heat generation continues for a certain period of time. Increase the power consumption of the entire hot water system.
The present invention has been made based on the above-described circumstances, and an object of the present invention is to provide a hot water supply system that can effectively use waste heat from a hot water storage tank and reduce the overall power consumption. is there.

  In order to achieve the above object, a hot water supply system according to the present invention includes a tank storage housing a hot water storage tank, a water supply pipe extending from the outside of the tank storage to the hot water storage tank and allowing water supply to the hot water storage tank, Includes a hot water supply line that extends from the tank to the outside of the tank room and allows hot water supply from the hot water storage tank, and a heater that operates based on the ambient temperature in the tank room, and stays in the water supply line and hot water supply line in the tank room Anti-freezing device that prevents freezing of water, a heating device that heats the hot water in the hot water storage tank and raises it to a predetermined boiling temperature, and extends from the hot water storage tank to the outside of the tank chamber. A discharge pipe that can discharge the expanded water generated by raising from the hot water storage tank, and an internal temperature riser that uses the heat of the expanded water to raise the atmosphere in the tank room when the heating device operates. (Claims) ).

According to the hot water supply system of claim 1, when the heating device is operated and the expanded water is discharged from the hot water storage tank through the discharge pipe to the outside of the tank cabinet, the heat of the expanded water raises the atmosphere in the tank cabinet. Used for
Specifically, it is desirable that the heater of the freeze prevention device is attached to each of the water supply pipe and the hot water supply pipe (Claim 2).

Further, the inside temperature raising means can include a heat radiation area formed in a part of the discharge pipe in the tank warehouse (Claim 3), and in this case, this heat radiation area is provided on the bottom side of the tank warehouse. A part of the discharge pipe can be formed in a zigzag shape (claim 4).
The heat dissipation area described above releases the heat of the expansion water flowing in the discharge pipe from the inside of the tank cabinet, specifically from the bottom of the tank cabinet, and uniformly raises the atmosphere in the tank cabinet.

  The heating device described above can include a heat pump unit disposed outside the tank cabinet (claim 5), and the heat pump unit efficiently converts atmospheric heat into hot water in a hot water storage tank.

Since the hot water supply system according to claims 1 and 2 uses the exhaust heat of the expansion water discharged from the hot water storage tank to raise the atmosphere in the tank cabinet, the atmospheric temperature in the tank cabinet can be prevented from freezing. The frequency at which the operating temperature of the anti-freezing device is lowered, that is, the operating frequency of the anti-freezing device is greatly reduced, and an increase in power consumption due to the operation of the anti-freezing device can be effectively suppressed.
In the hot water supply system according to claims 3 and 4, the inside temperature raising means includes a heat radiation area consisting of a part of the discharge pipe, so that the heat of the expansion water can be easily and effectively raised in the temperature inside the tank room. Can be used.

  The hot water supply system according to claim 5 greatly contributes to suppression of a load on the global environment.

FIG. 1 schematically shows a hot water supply system according to an embodiment.
The hot water supply system includes a hot water supply unit 2, and the hot water supply unit 2 includes a hot water storage tank 6 accommodated in a tank cabinet 4. A water supply line 8 extends from the bottom of the hot water storage tank 6, and this water supply line 8 passes through the tank store 4 and is connected to a water supply port 10 of the water supply. In the tank 4, a pressure reducing valve 12 is inserted in the water supply pipe 8, and this pressure reducing valve 12 adjusts the pressure of the hot water storage tank 6 to a constant pressure.

  A hot water supply pipe 14 extends from the upper part of the hot water storage tank 6, and the hot water supply pipe 14 also penetrates the tank storage 4 and is connected to an openable / closable hot water outlet 16 installed at a desired position in the building. Yes. In the tank cabinet 4, a mixing valve 18 is inserted in the hot water supply pipe 14, and a supply pipe 20 extends from the mixing valve 18. The supply pipe 20 is connected between the hot water storage tank 6 and the pressure reducing valve 12. It is connected to the water supply pipe 8 at the site. The mixing valve 18 mixes the hot water supplied from the hot water storage tank 6 and the supplied water from the supply pipe 20, and adjusts the temperature of the hot water supplied to the hot water supply port 16 to a desired temperature.

  In the tank store 4, antifreeze heaters 22 as antifreeze devices are respectively attached to predetermined positions of the water supply pipe 8 and the supply pipe 20. These anti-freezing heaters 22 are made of, for example, ceramic heaters, which generate energized heat when the ambient temperature in the tank storage 4 is lowered, and prevent freezing of water staying in the water supply line 8 and the supply line 20. In order to control energization of the antifreezing heater 22, a temperature sensor 24 is disposed in the lower part of the tank store 4, and this temperature sensor 24 detects the ambient temperature in the tank store 4.

On the other hand, a heat pump unit 26 as a heating device is installed outside the tank cabinet 4, that is, outside the building. The heat pump unit 26 uses CO ₂ refrigerant and stores a hot water between a refrigerant circulation circuit including circuit elements such as a compressor, an expansion valve and a heat exchanger, and between the heat exchanger of the refrigerant circulation circuit and the hot water storage tank 6. And a boiling path for circulating hot water in the tank 6. Specifically, the boiling path extends from the heat exchanger into the tank cabinet 4, and extends from the bottom of the hot water storage tank 6 to the outside of the tank warehouse 4 through the high-temperature line 28 connected to the upper part of the hot water storage tank 6, thereby exchanging heat. A low-temperature pipe line 30 connected to the vessel, and a circulation pump 32 is inserted in the low-temperature pipe line 30.

When the heat pump unit 26 is activated, heat exchange is performed between the refrigerant circulating in the refrigerant circulation circuit and the water or hot water circulating in the boiling path in the heat exchanger. The hot water of about 90 ° C. is supplied from the upper part through the high temperature line 28 in a stacked manner.
When hot water continues to be supplied to the hot water storage tank 6, the hot water temperature in the hot water storage tank 6 rises, and when the predetermined boiling temperature is reached, the operation of the heat pump unit 26 is stopped.

  Normally, the operation of the heat pump unit 26 described above is performed with the hot water storage tank 6 being full, and therefore, as the hot water temperature in the hot water storage tank 6 rises, the volume of the hot water storage expands. Since the expansion of the hot water storage excessively raises the inside of the hot water storage tank 6, in order to prevent overheating of the hot water storage tank 6, a discharge pipe 34 extends from the upper part of the hot water storage tank 6, and the discharge pipe A relief valve 36 is inserted in the passage 34. When the pipe internal pressure (the internal pressure of the hot water storage tank 6) at the portion of the discharge pipe 34 on the hot water storage tank 6 reaches a predetermined level, the relief valve 36 is opened, and the expanded water corresponding to the expansion of the hot water is stored in the hot water. It is discharged from the tank 6 through the discharge pipe 34.

  Here, the discharge pipe 34 is not simply drawn out of the tank store 4, but as is clear from FIG. After being routed to form, it is led out of the tank storage 4. Therefore, when the expansion water is discharged through the discharge pipe 34, the heat of the expansion water is radiated from the heat radiation area 38 into the tank storage 4 and the atmosphere in the tank storage 4 is raised.

  In order to enhance the above-described heat radiation effect, the discharge pipe 34 is formed of a material having excellent heat conductivity, for example, copper or the like, at least at a portion where the heat radiation area 38 is formed. Further, as shown in FIG. It is desirable that a part of the discharge pipe 34 is bent in a zigzag shape below the hot water storage tank 6. With such a zigzag heat radiation area 38, a wide heat radiation area is ensured, and the heat of the expansion water can be effectively radiated.

  The temperature rise of the atmosphere described above is the temperature at which the temperature inside the tank store 4 is set to the temperature sensor 24 described above, that is, the temperature at which energization of the antifreeze heater 22 is started, even if the outside air temperature outside the tank store 4 decreases. Therefore, the energization frequency of the anti-freezing heater 22 can be greatly reduced. As a result, power consumption associated with energization of the freeze prevention heater 22 is suppressed, which greatly contributes to energy saving of the entire hot water supply system.

Usually, since the heat pump unit 26 described above is operated by using midnight power, the heat of the expanded water from the hot water storage tank 6 is used at midnight when the outside temperature, that is, the ambient temperature in the tank storage 4 is the lowest. Thus, the atmosphere in the tank storage 4 can be raised in temperature, and the operation frequency of the antifreezing device including the antifreezing heater 22 can be effectively reduced.
The present invention is not limited to the above-described embodiment, and various modifications can be made.

For example, the heating device for heating the hot water in the hot water storage tank may be an electric heater arranged in the hot water storage tank, and the heat pump unit 26 described above is not limited to one using CO ₂ refrigerant. Absent.
Furthermore, it goes without saying that the specific shape and routing of the heat radiation area 38 can be changed as appropriate.

It is the schematic block diagram which showed the hot water supply system of one Example. It is the top view which showed the heat dissipation area concretely.

Explanation of symbols

4 Tankhouse 6 Hot water storage tank 8 Water supply line 14 Hot water supply line 22 Freezing prevention heater (freezing prevention device)
26 Heat pump unit 34 Discharge pipe 38 Heat radiation area

Claims (5)

A tankhouse containing hot water storage tanks;
A water supply line extending from the outside of the tank storage to the hot water storage tank and allowing water supply into the hot water storage tank;
A hot water supply line extending from the hot water storage tank to the outside of the tank cabinet and allowing hot water supply from the hot water storage tank;
An anti-freezing device that includes a heater that operates based on the atmospheric temperature in the tank cabinet, and prevents freezing of water that is retained in the water supply pipe and the hot water supply pipe in the tank cabinet;
A heating device that heats the hot water in the hot water storage tank and raises it to a predetermined boiling temperature;
A discharge line extending from the hot water storage tank to the outside of the tank cabinet, and capable of discharging the expanded water generated along with boiling of the hot water from the hot water storage tank when the heating device is operated;
A hot water supply system comprising an in-chamber temperature raising means for raising an atmosphere in the tank cabinet by using heat of the expanded water when the heating device is operated.   The hot water supply system according to claim 1, wherein the heater is attached to each of the water supply pipe line and the hot water supply pipe line.   The hot water supply system according to claim 2, wherein the inside temperature raising means includes a heat radiation area formed in a part of the discharge pipe in the tank compartment.   The hot water supply system according to claim 3, wherein the heat radiation area is formed by drawing a part of the discharge pipe in a zigzag shape on the bottom side of the tank storage.   The hot water supply system according to any one of claims 2 to 4, wherein the heating device includes a heat pump unit disposed outside the tank cabinet.

Images