JPH0142787Y2 - - Google Patents

Description

[Detailed description of the invention] <Technical field> The present invention collects solar energy as electrical energy using solar cells, and at the same time converts solar energy into thermal energy using a heat collector consisting of water pipes, heat collecting fins, etc. Concerning a combined light/thermal collector that collects data.

<Prior Art> The conventional art will be explained by using a flat collector as a combined light/thermal collector.

In general, a combined light/thermal collector is a flat type collector, as shown in Figure 1, which has the same structure as a conventional heat collector, except that the solar cell unit 1 is pasted on a heat collector plate 2. ing. That is, in the collector, a heat collection box is constructed from the outer frame 4, the bottom plate 3, and the transparent body 5,
A plurality of heat collecting plates 2 are disposed inside the heat collecting plate 2, and a heat insulating material is provided at the bottom thereof. Then, the insulation material (e.g. water, lower freezing liquid) is passed through the lower header 7 inside the heat collector.
a, the heat medium pipe 3, and the upper header 7b, where it is heated by solar heat.

Incidentally, the combined light/thermal collector is designed to effectively utilize solar energy not only as thermal energy but also as electrical energy. Its basic structure is that the solar cell unit 1 is thermally attached on a heat collector plate 2, and the obtained electrical output is transferred to a terminal 9 provided on the outer frame 4 of the heat collector.
It has many advantages, such as increasing the electrical conversion efficiency by cooling the solar cells and improving heat collection efficiency, as well as a synergistic effect of light and heat, as well as reducing the installation space of the collector. ing.

However, conventional collectors have had problems with the structure in which solar cells are attached. That is, FIG. 2 shows a cross-sectional structure of a conventional heat collecting section.
1. The adhesive layer 10 and the solar cell A are laminated,
Furthermore, a transparent resin film 12 is coated to cover the entire layer and improve durability. In order to obtain a predetermined voltage, it is necessary to insulate each solar cell from each other and connect them in series. It is necessary to interpose it between the solar cells 1. However, in such a laminated structure, the adhesion between the solar cell unit 1, in which the solar cells A and the insulating plate 11 are fixed with the adhesive 10, and the heat collecting plate 2 is poor, which not only causes a decrease in heat collecting efficiency, but also reduces the temperature of the solar cell. This increased the solar cell's conversion efficiency and caused a performance problem. In addition, in such a laminated structure, the heat collecting plate 2, the thermally conductive adhesive layer 10,
When the heat collecting section is heated due to the difference in thermal expansion coefficient between the insulating plate 11, the solar cell 1, etc. (for example, the adhesive layer 10
(during dry heating of the collector), thermal distortion may cause cracks in the adhesive layer 10, warping of the heat collecting plate 2, and even warping and cracking of the solar cell 1, resulting in damage not only to the appearance but also to the functionality. It had become a big problem. Furthermore, with the above-mentioned laminated structure, several to several dozen solar cells must be adhered to one heat collecting plate through insulating plates, making the work of attaching solar cells quite troublesome. Also, in the case of poor performance of a solar cell, it was not possible to replace only one solar cell.

<Purpose> The present invention was developed in view of the above points, and it improves the heat collection efficiency of the heat collector and the conversion efficiency of the solar cells by improving the adhesion between the solar cell unit and the heat collector. The purpose is to prevent the decline.

<Example> The following is an example of the present invention for a flat plate type.
This will be explained according to the drawings. Incidentally, those having the same configuration as the conventional one are given the same reference numerals and the description thereof will be omitted.

Figure 3 is a perspective view of the heat collecting plate, Figure 4 is the X in Figure 3.
-X sectional view. In FIGS. 3 and 4, reference numeral 2 denotes a heat collecting plate, which is made of a material with good thermal conductivity such as copper, and whose surface is treated with a selective absorption film. Heat medium pipe 8 on the back side of 2
is thermally attached. This heat collecting plate 2 constitutes a heat collecting body B together with the heat medium pipe 8 and the Hadder pipe 7. Returning to FIGS. 3 and 4, 13 is a solar cell unit. As shown in FIG. 4, a large number of solar cell units 13 are disposed on the surface of the heat collecting plate 2 in the longitudinal direction.As shown in FIG. , and a transparent resin 16 for molding the solar cell 14. The case 15 is a circular container with an open top and is made of ceramic, for example, which has excellent thermal conductivity and is insulating. In addition, a case 15 is placed at an appropriate position around this case 15.
A leg 17 is integrally formed with the heat collecting plate 2 and extends horizontally, and the case 15 is fixed to the heat collecting plate 2 by screws 18 passing through the leg 17 and the heat collecting plate 2 . The solar cell 14 is fixed to the case 15 with an adhesive 19, and its top and side surfaces are molded with transparent resin 16 to prevent deterioration. Reference numeral 20 denotes a thermally conductive filler interposed between the case 15 and the heat collecting plate 2, and the thermally conductive filler 20 is made of a material having good thermal conductivity and flexibility, such as silicone grease. It is configured. This thermally conductive filler 20 is interposed between the case 15 of the solar cell unit 13 and the heat collector plate 2 of the heat collector B, thereby absorbing the unevenness of the joint surfaces of the two and bringing them into close contact. Furthermore, it absorbs expansion, contraction, warping and deformation of the heat collecting plate 2 during heat collection and non-heat collection with its own flexibility, and always maintains heat collection with the solar cell unit 13. By bringing the solar cell unit 13 into close contact with the body B, the heat received by the solar cell unit 13 is efficiently conducted to the heat collector B. The other configurations are the same as before.

Therefore, the heat received by the solar cell unit 13 is efficiently transferred to the heat collector B by the thermally conductive filler 20 interposed between the case 15 and the heat collector plate 2. The heat collection efficiency of the solar cell unit 13 does not decrease, and the conversion efficiency of the solar cell unit 13 does not decrease. In addition, in this solar cell unit 13, the solar cells 14 are housed in a case 15 and attached to the heat collecting plate 2 with screws 1, so that the solar cells 1 are directly attached to the heat collecting plate 2 using resin. It has better workability than a molded one, does not require large-scale equipment during production, and does not easily separate the solar cell unit 13 from the heat collecting plate 2 due to thermal expansion/contraction, deformation, or warping. There isn't. In addition, a large number of solar cell units 13 arranged on the heat collecting plate 2
Even if only one of them fails, only the failed solar cell unit 13 can be removed by simply removing the screw 18, making maintenance easy.

In the above embodiments of the present invention, the case 15 is fixed with the screws 18. The case 15 may be fixed to the heat collecting plate 2 by providing a matching hole and the case 15 is fixed to the heat collecting plate 2 by the engagement between the claw and the hole. Any structure is sufficient as long as there is no problem and the solar cell unit 13 can be removed in case of maintenance or the like. The case 15 is made of ceramic or alumina, which has excellent thermal conductivity and excellent insulation properties, but as shown in FIG. 5, the inner surface of the container 21 made of conductive metal is coated with an insulating film 22. But it's okay.
Furthermore, although the collector has been described as a flat plate type collector, it is of course possible to use a vacuum tube type collector, a heat pipe type collector, or the like.

<Effects> According to the present invention, a case is made of a material with excellent thermal conductivity, has electrical insulation properties, and has an open top surface, and a single solar cell is thermally attached to the top surface of the case. Since a plurality of solar cell units are fixed to the heat collecting fins with a thermally conductive filler interposed therebetween, it is possible to simplify the production of a combined light/thermal collector. , maintenance such as replacement of the solar cell unit can be simplified.

In other words, when solar cells are directly fixed to heat collecting fins, the heat collecting fins themselves are large and require large-scale equipment to manufacture. It is only necessary to individually identify each unit into fins without requiring any special equipment. Similarly, when a single solar cell deteriorates, maintenance can be performed by replacing only that unit, making collector maintenance much easier than when solar cells are formed directly on the fins. I can do it.

Furthermore, since the solar cell unit is attached to the fin with a thermally conductive filler in between, unevenness on the joint surface between the case and the fin can be absorbed by the filler. Heat is efficiently transferred from the case to the fins via the filler, preventing a decrease in heat collection efficiency and also preventing a decrease in photoelectric conversion efficiency of the solar cell.

[Brief explanation of the drawing]

Fig. 1 is a cutaway perspective view of a general light/thermal combined type collector, Fig. 2 is a sectional view of a conventional combined light/thermal collector, and Fig. 3 is a combined light/thermal type according to an embodiment of the present invention. A partial perspective view of the collector, FIG.
-X sectional view, FIG. 5 is a sectional view of another embodiment, and shows a case. B: Heat collector, 13: Solar cell unit, 20:
Thermal conductive filler.

Claims (1)

[Claims for Utility Model Registration] A collector comprising a heat transfer body consisting of a heat transfer pipe and heat collection fins thermally attached to the heat transfer pipe, which is made of a material with excellent thermal conductivity and is electrically conductive. A solar cell unit consists of a case with insulation properties and an open top side, and a single solar cell heat-conductively attached to the top surface of the case. A composite light/thermal collector that is fixed with a conductive filler.