JP2021071282A - Heat source storage system utilizing solar power generation - Google Patents

Abstract

To avoid accumulating electric power generated by solar power generation in a storage battery and accumulate the electric power in another form to utilize the electric power in a more effective manner.SOLUTION: A heating source storage system has: a heater which is operated by directly utilizing output electric power of a solar power generator; a heating source storage tank which stores water to be heated by the heater; and a heat exchanger which is installed in the heating source storage tank so as to send water, which has been subject to heat exchange with hot water in the heating source storage tank, to the outside. The water flowing through the heat exchanger circulates between the heat exchanger and the outside. The heating source storage system has means for sending the hot water in the heating source storage tank to the outside.SELECTED DRAWING: Figure 1

Description

The present invention relates to a storage system for a cold or hot source using photovoltaic power generation.

The photovoltaic power generation system outputs DC power by irradiating the solar cell with sunlight. The output DC power is generally converted into alternating current by an inverter and supplied to various electrical loads. In addition, a storage battery is usually incorporated in the photovoltaic power generation system, and surplus power is stored in the storage battery. The power stored in the storage battery is used to supplement the power shortage of photovoltaic power generation.

On the other hand, in Patent Document 1, in order to reduce the energy consumption used for cooling in summer, ice and snow frozen in winter are stored in an ice storage chamber until summer, and cold air is taken out from the ice storage chamber for cooling in summer. The system used for such purposes is disclosed.

Patent Document 2 discloses a mobile ice house in which natural ice obtained by freezing a water tank in winter is stored in a heat-insulated container, and the container is transported by vehicle in summer and used as a cold heat source in various places. Has been done.

Japanese Unexamined Patent Publication No. 7-305873 JP-A-2009-127894

Since the amount of power generated by photovoltaic power generation fluctuates greatly depending on the weather and day and night, there is a problem with the capacity of the storage battery when storing the power generated by photovoltaic power generation in the storage battery, and control is complicated when the power is taken out from the storage battery and used. In addition, the power loss was large.
Further, the method of using ice or snow in winter as a cold heat source described in Patent Documents 1 and 2 has a problem that the place where it can be used is limited to a cold region.

An object of the present invention is to use the electric power more effectively by accumulating the electric power generated by photovoltaic power generation in another form without accumulating the electric power in the storage battery.

In order to solve the above-mentioned problems, the present invention has the following configurations.
-Aspects of the present invention are a heater that is a heat source storage system and is operated by directly using the output power of a photovoltaic power generation device.
A heat source storage tank for storing water heated by the heater, and
It is characterized by having a heat exchange device installed in the heat source storage tank for sending out water that has been heat exchanged with the hot water of the heat source storage tank to the outside.
-In the above embodiment, it is preferable that the water flowing through the heat exchange device circulates with the outside.
-In the above aspect, it is preferable to have a means for sending out the water heated in the heat source storage tank to the outside.

By storing the power generated by solar power generation as a heat source instead of storing it in the storage battery, the power can be used more effectively.

FIG. 1 is a schematic configuration diagram of an example of a heat source storage system using solar power generation according to the present invention. 2 (a), (b), and (c) are views showing a usage example of the heat source storage system shown in FIG.

Hereinafter, the heat source storage system using photovoltaic power generation according to the present invention will be described in detail with reference to the drawings. In the present invention, the electric power generated by photovoltaic power generation is stored as a heat source instead of being stored in the storage battery. In this case, the "heat source" is a cold heat source having a temperature lower than the temperature of the object to be used, or a heat source having a temperature higher than the temperature of the object to be used. The temperature to be used is not strictly specified, but the average room temperature or water temperature in daily life in a warm climate is used as a guide. For example, the room temperature is 25 ° C. ± 5 ° C. and the water temperature is 10 ° C. ± 5 ° C., but the temperature is not limited to these ranges.

FIG. 1 is a schematic configuration diagram of an example of a heat source storage system using solar power generation according to the present invention. In FIG. 1, the flow of cold water or cold air is indicated by a black arrow, and the flow of hot water is indicated by a white arrow. The photovoltaic power generation device 10 is configured by appropriately connecting solar cell panels. The photovoltaic power generation device 10 generates DC electric power. The power conversion device 11 includes, for example, a power conversion circuit such as a switching power supply and / or an inverter, and outputs an alternating current having an appropriate voltage and frequency or a direct current having an appropriate voltage.

The power switching device 12 switches so that the output power of the power conversion device 11 is sent to either the refrigerator 21 or the heater 31 or to both of them. Although not shown, when sending to both sides, the ratio of power distribution can also be adjusted. The drive control of the power conversion device 11 and the switching control of the power switching device 12 are performed by, for example, an appropriately provided controller 60.

When the power conversion device 11 outputs an alternating current and the refrigerating machine 21 or the heater 31 operates using the alternating current as a power source, the alternating current output of the power conversion device 11 is used as it is as a power source for the refrigerator 21 or the heater 31. When the refrigerating machine 21 or the heater 31 is a device that operates using direct current as a power source, it is used as a power source after mediating a device (not shown) that converts the AC output of the power conversion device 11 into direct current.

When the power conversion device 11 outputs direct current and the refrigerator 21 or heater 31 operates using direct current as a power source, the direct current output of the power conversion device 11 is used as it is as a power source for the refrigerator 21 or heater 31. When the refrigerating machine 21 or the heater 31 is a device that operates using alternating current as a power source, it is used as a power source after mediating a device (not shown) that converts the direct current output of the power conversion device 11 into alternating current.

In any case, the refrigerator 21 or the heater 31 is operated by directly using the output power of the photovoltaic power generation device 10. “Direct use” means that the output power of the photovoltaic power generation device 10 is not stored in the storage battery, but is immediately supplied to the refrigerator 21 or the heater 31 for consumption.

The refrigerator 21 is installed in the cold heat source storage chamber 20. The cold heat source storage chamber 20 is provided, for example, as a building or a container having an internal space surrounded by a heat insulating floor, walls and ceiling. A large number of water tanks 22 are installed in the internal space of the cold heat source storage chamber 20. In the large number of water tanks 22, for example, the water tanks 22 are arranged in several rows and columns in each stage, and a plurality of water tanks 22 are arranged in the vertical direction. Each water tank 22 is filled with water. By operating the refrigerator 21, the air in the cold heat source storage chamber 20 is cooled, and the water in the water tank 22 freezes to become ice. The frozen ice in the water tank 22 serves as a cold heat source. That is, the electric power generated by photovoltaic power generation is converted into a cold heat source and stored. Then, even during the period when the refrigerator 21 is stopped, the air in the cold heat source storage chamber 20 is maintained at a low temperature for a relatively long time by the cold heat source.

Further, in the cold heat source storage chamber 20, heat exchange devices 23 and 24 provided with heat exchange pipes are installed. Although two different heat exchange devices 23 and 24 are shown in FIG. 1, only one of the heat exchange devices can be provided, or a plurality of each of the heat exchange devices can be provided, if necessary. .. The heat exchange device exchanges heat between the water flowing in the heat exchange pipe and the air in the cold heat source storage chamber 20. The heat-exchanged water is sent out to the outside of the cold heat source storage chamber 20.

FIG. 1 schematically shows various external consumers 50 together. The water flowing through the heat exchange device 23 flows to another heat exchange device 51 installed in the external consumer 50 through a cold water line 41 provided with a valve for switching between water supply and stop and a pump P for delivery. After exchanging heat here, it returns and circulates.

Further, the heat exchange device 24 is supplied with, for example, general tap water or the like as water flowing through the heat exchange device 24 from the outside. The supplied water flows through the heat exchange device 24 and is supplied to the external consumer 50 through a chilled water line 42 provided with an appropriate valve and pump, where it is used as chilled water.

Further, the cooled air in the cold heat source storage chamber 20 can be supplied to the external consumer 50 by the cold air line 43 provided with the blower fan M. The supplied cold air is used by the consumer 50. Although not shown, in this case, the cold heat source storage chamber 20 is provided with a ventilation hole for supplementing the sent out air.

Next, the heater 31 is installed in the heat source storage tank 30. The heat source storage tank 30 is preferably provided as a tank having an internal space surrounded by a heat insulating peripheral wall. The internal space of the heat source storage tank 30 is filled with water supplied from the outside. By operating the heater 31, the filled water is heated to become hot water 32. The temperature of the hot water 32 is, for example, in the range of 30 ° C. to 90 ° C., but is not limited to this range because it is determined by various conditions. This hot water 32 serves as a heat source. That is, the electric power generated by photovoltaic power generation is converted into a heat source and stored. Even during the period when the heater 31 is stopped, the temperature of the water in the heat source storage tank 30 is maintained at a high temperature for a relatively long period of time by the heat source.

Further, a heat exchange device 33 provided with a heat exchange pipe is installed in the heat source storage tank 30. Although one heat exchange device 33 is shown in FIG. 1, a plurality of heat exchange devices 33 can be provided as needed. The heat exchange device exchanges heat between the water flowing in the heat exchange pipe and the hot water 32 of the heat source storage tank 30. The heat-exchanged water is sent out to the outside of the heat source storage tank 30.

The water flowing through the heat exchange device 33 flows to another heat exchange device 52 installed in the external consumer 50 through a hot water line 44 provided with a valve for switching between water supply and stop and a pump P for delivery. After exchanging heat here, it returns and circulates.

Further, the hot water 32 of the heat source storage tank 30 can be supplied to the external consumer 50 by a hot water line 45 provided with an appropriate valve and a pump P. The supplied hot water is used by the consumer 50. In this case, water corresponding to the amount of hot water sent out is newly filled in the heat source storage tank 30.

The supply of cold water, cold air and / or hot water to the external consumer 50 is performed according to the needs of the consumer 50 and can be controlled by the controller 60. Alternatively, it may be controlled by a controller different from the controller 60. The supply of cold water, cold air and / or hot water can be performed either while the power supply to the refrigerator 21 and / or the heater 31 is being supplied, or while the power supply is stopped.

When the controller 60 sends electric power to both the refrigerator 21 and the heater 31, the controller 60 can adjust the ratio of the electric power distributed to each of them. For example, when the demand for cold water and cold air increases and the temperature in the cold heat source storage chamber 20 rises, the electric power distributed to the refrigerator 21 can be increased. Further, the controller 60 can increase the electric power distributed to the heater 31 when, for example, the demand for hot water increases and the temperature in the heat source storage tank 30 decreases. As a specific example, a switching power supply (not shown) is provided at the input unit of each device of the refrigerating machine 21 and the heater 31, and the duty ratio of the PWM (Puls Width Modulation) signal that controls the switching of each switching power supply is controlled. This makes it possible to adjust the power supplied to each device. Further, it is preferable that each of the cold heat source storage chamber 20 and the heat source storage tank 30 has a sensor (not shown) that detects the internal temperature and notifies the controller 60.

The present invention may be a cold heat source storage system in which only the cold heat source storage chamber 20 is provided and cold water and / or cold air is used, or a heat source storage system in which only the hot heat source storage tank 30 is provided and hot water is used. You can also do it.

FIG. 2 is a diagram showing some examples of using the heat source storage system shown in FIG. 1 for consumers. However, the usage patterns of the present invention are not limited to these.

FIG. 2A is an example of use in an apartment house. The cold water line 42 and the hot water line 45 are connected via a three-way valve. As a result, hot water or cold water can be switched and used, and hot water or cold water is supplied to each house. A hot water / cold water switching valve may be provided in each house.

FIG. 2B is an example of use in a detached house. The cold water line 41, the cold air line 43, and the hot water line 45 are connected. The circulating water flowing through the cold water line 41 is used for cooling and refrigerating via the heat exchange device 51. The air flowing through the cold air line 43 is also used for cooling and refrigerating.

FIG. 2C shows an example of use in a storage and aging storage for agricultural products and marine products. The circulating water flowing through the cold water line 41 is used for cold insulation and aging of agricultural and marine products via the heat exchange device 51. The same applies to the air flowing through the cold air line 43.

The heat source storage system according to the present invention can be carried out anywhere on the earth where solar power generation can be carried out. In addition, the electric power of the photovoltaic power generation can be stored by selecting either or both of the cold heat source and the hot heat source, if necessary. For example, in the summer, a refrigerator can be operated to store as a cold heat source and use cold water or cold air, and in winter, a heater can be operated to store as a hot source and use hot water. However, the present invention can store the generated power as both a cold heat source and a hot heat source regardless of the season. It is also possible to use a cold heat source and a hot heat source together as in the above-described embodiment.

Consuming the power of photovoltaic power generation directly with a refrigerator or a heater has far less loss than the case where the generated power is once stored in a storage battery and then taken out and consumed. Therefore, according to the present invention, it is possible to effectively utilize the electric power generated by the natural energy as a whole.

The embodiment of the present invention described above is an example, and various modified forms to which various known techniques are applied are possible in addition to these, and these are also included in the present invention.

10 Photovoltaic power generation device 11 Power conversion device 12 Power switching device 20 Cold heat source storage room 21 Refrigerator 22 Water tank 23, 24 Heat exchange device 30 Heat source storage tank 31 Heater 32 Hot water 33 Heat exchange device 41 Cold water line (circulation)
42 Cold water line 43 Cold air line 44 Hot water line (circulation)
45 Hot water line 50 Consumer 51, 52 Heat exchanger 60 Controller

Claims (3)

A heater that is operated by directly using the output power of the photovoltaic power generation device,
A heat source storage tank for storing water heated by the heater, and
A heat source storage system comprising: a heat exchange device installed in the heat source storage tank for sending out water exchanged with hot water in the heat source storage tank to the outside. The heat source storage system according to claim 1, wherein the water flowing through the heat exchange device circulates with the outside. The heat source storage system according to claim 1 or 2, further comprising means for sending out hot water in the heat source storage tank to the outside.

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