JPS6350623B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a conversion device that converts solar energy into thermal energy and electrical energy, and it is a hybrid device that incorporates a heat collecting member and a solar cell in one device so that it is not subject to restrictions on installation location. It is an object.

In general, the performance and lifespan of solar cells are affected by the ambient temperature and humidity during use, and particularly at high temperatures, the output becomes unstable and the efficiency decreases.

In view of this, the solar cell is located in a space that is not in communication with the outside air, which is formed in the gap between the transparent inner and outer tubes, and is installed on the outer peripheral wall of the inner tube, so that the absorbed heat can be transmitted to the inner tube. In addition to suppressing temperature rise, the heat collecting member located inside the inner tube is heated by the heat of the inner tube. Furthermore, since solar cells have the characteristic of reflecting a portion of incident light, it is attempted to effectively utilize this reflected light for heat collection.

An embodiment of the present invention will be described below based on FIGS. 1 to 3. 1 is a translucent outer tube made of glass with openings at both ends; 2 is a translucent inner tube made of glass with openings at both ends disposed coaxially within the outer tube 1 with a gap 3; The ends 1' and 2' are heated and melted by the combustion flame of a gas burner and fused and bonded to each other, so that the inside of the gap 3 between the two tubes 1 and 2 is not communicated with the outside air. Further, if necessary, the gap 3 is evacuated using an exhaust tip tube 4 provided on the peripheral wall of the outer tube 1, or the tip tube 4 is fused after the gap 3 is filled with an insulating gas such as dry air or nitrogen gas. 5 is an amorphous silicon solar cell formed on the outer circumferential wall of the inner tube 2 before the outer tube 1 and the inner tube 2 are integrally joined, and includes a lower transparent electrode, an amorphous silicon layer, an upper transparent electrode, or the above aluminum electrode, If necessary, a current collector plate is formed directly on the outer peripheral wall of the inner tube 2 in this order by glow discharge or vapor deposition. The width of the battery 5 is within the lower half circumference of the inner tube so that sunlight reflected by the battery 5 is focused approximately at the center of the inner tube. Reference numeral 6 denotes a lead-out terminal of the solar cell 5 embedded in the peripheral wall of the outer tube 1, to which a lead wire 7 drawn out from the solar cell 5 is connected before the outer tube 1 and the inner tube 2 are integrated. Reference numeral 8 denotes a heat insulating plug made of rubber or the like which serves as a sealing member for sealing the openings at both ends of the inner tube 2, and is removably fitted into the opening to make the inside of the inner tube 2 airtight. Reference numeral 9 denotes a heat collecting member disposed at the center of the inner tube 2, with both ends protruding through the plug body 8, through which a heat medium such as water flows.

The sunlight passes through the outer tube 1 and the inner tube 2 and is irradiated onto the heat collecting member 9, thereby heating the heat medium passing through the heat collecting member 9. It is converted into so-called thermal energy.

On the other hand, sunlight is also applied to the solar cell 5, converted into electricity, and the output is taken out from the lead terminal 6. Further, sunlight reflected by the solar cells 5 is irradiated onto a heat collecting member 9 disposed approximately at the center of the inner tube 2, thereby promoting thermal energy conversion.

In other words, the band of the sunlight spectrum that is converted into electricity is visible light of approximately 0.35 to 0.7μ, and infrared rays beyond that (0.7 to 1.5μ) are not effective for electrical conversion, but on the contrary, are effective for thermal energy conversion. Therefore, what is reflected by the solar cells is the infrared rays effective for the thermal energy conversion described above, and the heat collecting member 9 is heated from almost the entire circumference by the direct sunlight and the reflected light reflected by the solar cells 5. Ru.

Furthermore, the heat absorbed by the solar cells is transferred to the inner tube 2 to prevent the temperature of the solar cells 5 from rising.
Since the heat from the inner tube increases the temperature inside the inner tube, the heat collecting member 9 is also heated by the heat from the inner tube.

FIG. 4 is a diagram showing another embodiment of the present invention, in which the outer tube 1 and the inner tube 2 each have a bottomed opening at one end, and the heat collecting member 9 is filled with a working fluid that changes into two phases: gas and liquid. It is a heat pipe type, and a heat exchanger 10 is connected to the common heating end of the heat pipe. A heat medium such as water is passed through the center passage 10a of the heat exchanger 10, and the outer circumferential passage 10b of the center passage 10a is communicated with the inside of the heat pipe for heat exchange. This is no different from the embodiment. FIG. 5 shows a third embodiment of the present invention, in which a metal stem 11 is connected to the joints at both ends of the inner and outer tubes 2 and 1 with a fritted glass 12 instead of the stopper 8, and a heat collecting member 9 is attached. This stem 11 is protruded through and soldered, and one stem 11 and the heat collecting member 9 are connected via a telescopic bellows 13, so that the heat between the inner and outer tubes 2, 1 and the heat collecting member 9 is connected. It is designed to absorb expansion and contraction due to differences in expansion coefficients.

In this embodiment, the interior of the inner tube 2 is evacuated by using a metal exhaust chip tube 14 provided on the stem 11, or dry air or heat insulating gas is filled in the heat collecting member 9.
form an insulating space around the

As described above, the present invention connects the open ends of the light-transmitting outer tube and the light-transmitting inner tube disposed with a gap in the outer tube to make the gap between the two tubes non-communicating with the outside air. A solar cell is provided on the outer circumferential wall of the inner tube, and the opening of the inner tube is sealed with a sealing member, and a heat collecting member is installed inside the inner tube by penetrating the sealing member. Therefore, the heat conversion section and the electric conversion section are integrated into one device, and the installation space can be used effectively. That is, since the solar energy density is low, a large installation area is required for large-capacity heat conversion and electrical conversion. Therefore, if the heat conversion device and the electrical conversion device are separate, only half of the limited installation space can be used for each, but with the present invention, both functions are incorporated into one device, so twice the amount of device can be used. It is possible to install and convert large capacity.

Furthermore, solar cells are not affected by humidity, and the absorbed heat is transferred to the inner tube to prevent high temperatures, resulting in stable performance and extended service life.

Furthermore, the heat of the solar cells transferred to the inner tube eventually heats the heat collecting member disposed within the inner tube, so that the solar thermal energy can be effectively utilized.

Furthermore, since the solar cells are provided on the lower half of the inner tube, the sunlight reflected by the solar cells is irradiated onto the heat collecting member, further promoting heat collection.

[Brief explanation of the drawing]

The figures are all of the present invention; Fig. 1 is a cross-sectional view, Fig. 2 is a longitudinal sectional view, Fig. 3 is a cross-sectional view showing the process in progress, and Fig. 4 and Fig. 5 are the second and third cross-sectional views, respectively. FIG. 1...Outer tube, 2...Inner tube, 5...Solar cell.

Claims (1)

[Scope of Claims] 1. The open ends of a translucent outer tube and a translucent inner tube disposed with a gap in the outer tube are joined to each other so that the gap between the two tubes is not communicated with the outside air. A solar cell is provided on the outer peripheral wall of the inner tube, and the opening of the inner tube is further sealed with a sealing member, and a heat collecting member is installed inside the inner tube by penetrating the sealing member. A solar energy conversion device. 2. The solar energy conversion device according to claim 1, wherein the gap between the outer tube and the inner tube is evacuated. 3. The solar energy conversion device according to claim 1, wherein dry air or an insulating gas is sealed in the gap between the outer tube and the inner tube. 4 Claim 1 in which the inside of the inner tube is vacuumed
The solar energy conversion device according to item 1, or 2 or 3. 5 Claims 1, 2, or 3 in which dry air or insulating gas is sealed inside the inner tube.
The solar energy conversion device described in Section 1. 6. Claim 1, wherein the solar cell is provided on the outer peripheral wall of the inner tube located below the heat collecting member so that the sunlight reflected by the solar cell is irradiated onto the heat collecting member.
The solar energy conversion device described in Section 1.