JPH0566473U - Solar water heater with solar cell - Google Patents

Abstract

(57) [Abstract] [Purpose] In a water heater using amorphous silicon solar cells, the light on the long wavelength side of sunlight is effectively used. [Structure] Main components are a water heater that warms water to collect heat by irradiating sunlight and a solar cell that generates electricity by receiving sunlight. The solar cell is high on the short wavelength side of sunlight. The solar cell is composed of an amorphous silicon solar cell having photosensitivity, and the solar cell is arranged so as to reflect, to the water heater, the light on the long wavelength side of the sunlight that has not contributed to power generation.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a solar water heater using a solar cell.

[0002]

[Prior Art]

 Conventionally, a natural circulation type solar water heater is composed of a heat collecting part and a hot water storage part, which are separately provided and circulate and store hot water by utilizing the difference in specific gravity due to the temperature difference of water. is there. This solar water heater cools the hot water in the hot water storage section by stopping heating of the heat collecting section after sunset, or stopping the circulation of hot water when the amount of solar radiation in winter is small. Therefore, it is possible to always store hot water in the hot water storage section by installing and operating a circulation pump so that the water heater can be operated even when the amount of solar radiation is low at night or in winter. A solar cell can be used as the electric power for operating this circulation pump.

On the other hand, a solar cell is made of a single crystal, a polycrystal, and an amorphous silicon as its material type, and its characteristics are different from each other. As shown in Fig. 2, various solar cells have different spectral sensitivity characteristics that indicate the rate of conversion to electricity depending on the color (wavelength) of light. In other words, single crystal silicon solar cells have a large photosensitivity to long-wavelength light with a wavelength of 0.7 μm or more, and amorphous silicon has a photosensitivity to short-wavelength light. Application ”by Yukinori Kuwano, Power Company, p.37, Figure 4-5).

Further, as shown in FIG. 3, sunlight has a high emission spectrum intensity on the short wavelength light side (see “Solar Cell and Its Application” p. 38, FIG. 4-6).

[0005]

[Problems to be solved by the device]

 However, when amorphous silicon is used for the solar cell used in the above water heater, the spectral sensitivity of the amorphous silicon solar cell is light on the short wavelength side, which is close to that of sunlight. The light on the wavelength side is not so sensitive to light, so the light on the long wavelength side is wasted.

[0006]

[Means for Solving the Problems]

 The present invention is mainly composed of a water heater that heats water by collecting sunlight by irradiating sunlight and a solar cell that generates electricity by receiving sunlight. The solar cell consists of an amorphous silicon solar cell with high photosensitivity.This solar cell is arranged so that the long-wavelength light that did not contribute to power generation in the solar light irradiated on the solar cell is reflected by the water heater. There is.

[0007]

[Action]

 According to the present invention, since the amorphous silicon solar cell has a spectral sensitivity on the short wavelength side and is close to sunlight, it is possible to obtain highly efficient generated power and operate the circulation pump. The long-wavelength light of the unexposed sunlight is reflected on the surface of the solar cell and is incident on the heat collecting part of the water heater.

[0008]

【Example】

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a solar water heater with a solar cell according to the present invention. Reference numeral 1 denotes a heat collecting part, which is a place where the water inside the heat collecting part 1 is warmed by irradiation of sunlight, and a transparent plate 2 made of tempered glass or the like is provided on a heat collecting body such as black-treated stainless steel. The heat area is 4 m ² . Reference numeral 3 denotes a hot water storage portion, in which water is pre-injected into the hot water storage portion 3 and heated in the heat collecting portion 1, so that cold water is warmed to hot water due to a difference in specific gravity of water, and hot water is stored in the hot water storage portion 3. Yes, heat insulation is used to prevent the temperature drop of hot water. A solar cell 4 made of amorphous silicon is installed so that sunlight can enter the side surface of the hot water storage portion 3 and that light on the long wavelength side of the sunlight can be reflected by the heat collecting portion 1. A circulation pump 5 is operated by electric power generated from the solar cell 4 and forcibly circulates the hot water in the heat collecting section 1.

In the water heater, sunlight is transmitted through the transparent plate 2 and collected by the heat collector during sunshine. As a result, the temperature of the heat collecting section 1 rises, the water temperature in the heat collecting section 1 rises, and the hot water is circulated. The hot water is heat-transferred so as to raise the water temperature of the hot water storage unit 3, and the hot water storage unit 3 stores the hot water. On the other hand, sunlight is also applied to the amorphous silicon solar cell 4. This solar cell 4 generates power at a high output, and the generated power operates the circulation pump 5 to circulate the hot water in the heat collecting section 1, which transfers heat to the water in the hot water storage section 3. And you can raise the water temperature. In this way, the hot water stored in the hot water storage unit 3 is kept warm by the heat insulating material, so that it can be maintained without lowering the water temperature.

In the shade, in the sunshine, the hot water obtained by irradiating the heat collecting portion 1 and circulating it and the hot water obtained by circulating the heat collecting portion 1 by operating the circulation pump 5 are the hot water storage portion 3 Since it is stored in the water, the water temperature does not drop sharply due to the heat insulating material.

On the other hand, since sunlight has sensitivity to light on the short wavelength side, incident light on the amorphous silicon solar cell 4 sensitive to light on the short wavelength side is efficiently converted into electricity. However, light on the long wavelength side of sunlight is not easily absorbed by the amorphous silicon solar cell 4, and is reflected on the surface of the solar cell 4. The reflected light is applied to the surface of the heat collecting section 1 and is exchanged for heat in the heat collecting section 1. By providing in this way, the light on the long wavelength side of the sunlight can be incident on the heat collecting part 1 of the water heater without wasting it, and the temperature of the heat collecting part 1 can be raised.

It is also possible to charge the storage battery with the generated electric power at the time of sunshine and use this electric power at night to operate the circulation pump to prevent the temperature from lowering. You may change and set the angle of the light-receiving surface of a solar cell.

[0013]

[Effect of the device]

 According to the present invention, the main components are a water heater that warms water by collecting sunlight to collect heat, and a solar cell that generates power by receiving sunlight. It consists of an amorphous silicon solar cell with high light-sensitivity on the light side, and this solar cell is arranged to reflect the long-wavelength light that did not contribute to power generation, out of the sunlight irradiated on the solar cell, to the water heater. Since the spectral sensitivity of the amorphous silicon solar cell is on the short wavelength side and is close to that of sunlight, it is possible to obtain highly efficient generated power, operate the circulation pump, and not collect it in the solar cell. The light on the long wavelength side of sunlight is reflected on the surface of the solar cell and is incident on the heat collector of the water heater, and at the same time, it is converted into heat at that heat collector, wasting the entire wavelength range of sunlight. It can be used without any.

[Brief description of drawings]

FIG. 1 is a perspective view of a solar water heater with a solar cell according to the present invention.

FIG. 2 is a characteristic diagram showing the spectral sensitivity of various solar cells.

FIG. 3 is a characteristic diagram showing a radiation spectrum of a light source and a spectral sensitivity of a solar cell.

[Explanation of symbols]

 1 Heat collection part 3 Hot water storage part 4 Amorphous silicon solar cell 5 Circulation pump

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Shoji Sakai 2-18, Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Ichiro Yasui 2--18, Keihanhondori, Moriguchi, Osaka Sanyo Electric Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A water heater that heats water by collecting sunlight by irradiating sunlight, and a solar cell that generates electricity by receiving sunlight.
The main constituent element of the solar cell is an amorphous silicon solar cell having high light receiving sensitivity on the short wavelength light side of sunlight, and this solar cell is used for power generation out of the sunlight irradiated on the solar cell. A solar water heater with a solar cell, which is arranged so as to reflect light on the long wavelength side that has not contributed to the water heater.