JPS5834386Y2 - solar heat collector - Google Patents

Description

[Detailed explanation of the idea] This proposal concerns an indirect heating type solar heat collector.

Indirect heating type solar collectors have a structure that heats the liquid in the hot water tank by transmitting the solar radiation heat received by the heat collecting plate to the fluid in the hot water storage tank through heat transfer tubes.The heat transfer tubes can be heat pipes or A thermosyphon or a closed cycle of circulating heat medium is used.

Therefore, in order to efficiently collect heat with such an indirect heating type solar collector, it is necessary to have a heat collection part with a structure that efficiently transfers solar heat to the heat medium, and a heat collection part that efficiently transfers solar heat to the heat medium, and a liquid in the hot water storage tank that uses the heat of the heat medium. It is necessary to integrally form the heat collecting part and the heat dissipating part with a structure that can efficiently heat the solar heat collector, and this proposal has sufficient mechanical strength so that the heat collecting part and the heat dissipating part can be incorporated into the solar heat collector. .

The following is an explanation based on the drawings showing one embodiment of the present invention.
2 is a heat collecting plate that receives solar heat; 2 is a hot water storage tank that stores fluid heated by the heat received by the heat collecting plate and supplies it to the outside; 3 is a hot water storage tank that receives heat from the heat collecting plate 1; It is a heat transfer tube that conducts to the fluid in the hot water storage tank 2, and the heat transfer tube 3 has a heat collecting part 5 fitted in a groove 4 of the heat collecting plate so that the heat of the heat collecting plate 1 can be effectively collected;
It has a heat radiation part 6 which is immersed in the fluid in the hot water storage tank 2 to heat the fluid, and a heat medium for heat transport is sealed inside.

The heat transfer tube 3 having such a configuration moves the liquid heat medium accumulated in the lower part of the tube upward by heating and vaporizing it, and guides the heat medium that has been radiated and condensed in the upper part downward by gravity to start heat transfer again. a thermosiphon in which a closed cycle of the heating medium is formed for use, a thermosiphon in which the movement of the heating medium is carried out in a single conduit under the cross flow of a gaseous heating medium and a liquid medium, or Any so-called heat pipe in which a wick is installed in the pipe line to enable movement of the liquid heat medium in the anti-gravity direction can be used, but the drawing shows an embodiment using a thermosiphon.

Therefore, since the energy density of solar radiant heat is generally small, the heat collecting part 5 in the solar heat collector using the heat transfer tube 3 described above is formed as a narrow flow path on a large plane, while the energy density is increased. In order to efficiently heat the liquid in the hot water storage tank 2, the heat radiating part 6 is thicker than the heat collecting part 5 and has a larger surface in contact with the liquid, or is equipped with heat radiating fins so that it can be intercepted. This is preferable in terms of miniaturization.

However, from the viewpoint of maintaining the mechanical strength of the solar heat collector, it is possible to increase the diameter of the heat dissipation part 6 or attach heat dissipation fins to increase the weight of the heat dissipation part 6 before joining it to the heat collection part 5. is not desirable.

In order to solve this contradiction, in this project, the mechanically weak parts of the heat exchanger tubes are reinforced with heat collecting plates 1, and the heat collecting parts 5 are shown in Figs. 2 and 3. As shown,
By fitting into the groove 4 of the heat collecting plate, the necessary strength can be secured even with a relatively thin tube, and the heat of the heat collecting plate 1 can be quickly transferred to the heat medium in the heat collecting part. There is.

In addition, the heat dissipation section 6 not only suffers corrosion due to contact with liquid in the hot water storage tank 2, but also is touched directly by hand when removing rust or attached water, so it is recommended to make the pipe wall thicker than the heat collection section 5. As shown in FIGS. 2 and 4, the heat dissipating section 6 and the heat collecting section 5 are joined airtightly so that the tube ends 7 and 8 overlap each other, and the overlapping section 9 has a groove. 4, and by brazing the heat collecting plate 1 and the overlapping part 9 as necessary, most of the external force applied to the heat dissipating part 6 is released to the heat collecting plate, resulting in a thin wall. This prevents excessive external force from acting on the heat collecting portion 5.

In this way, in the proposed solar heat collector, the joint between the heat collecting part, which receives heat collected by solar radiation, and the heat radiating part, which transfers the collected heat to the liquid in the hot water storage tank, is reinforced with a heat collecting plate. Therefore, in the design of the heat transfer tube, the heat collecting section should be set to the tube diameter and wall thickness that provides the most efficient heat collection in relation to the heat collecting plate, and the heat dissipating section should be selected in relation to the hot water tank in which the heat dissipating section is immersed. It adopts a shape and wall thickness that are most efficient in heating liquids, and can be assembled without sacrificing mechanical strength, making it possible to manufacture solar collectors with high heat collection efficiency.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the solar heat collector according to the present invention, Fig. 2 is a cutaway view of main parts showing the structure of the heat exchanger tube according to the present invention, Fig. 3 is an end view taken along line III-III in Fig. 2, FIG. 4 is an end view taken along line IV-IV in FIG. 2. 1... Heat collection plate, 2... Hot water storage tank, 3...
... Heat exchanger tube, 5 ... Heat collection section, 6 ...
- Heat dissipation part, 9...Overlapping part, 10...Groove.

Claims (1)

[Scope of utility model registration request] A heat collecting plate that receives solar heat, and a heat transfer tube that transfers the heat received by the heat collecting plate to a hot water storage tank to heat the liquid in the tank, and the heat transfer tube is attached to the heat collecting plate in a heat conductive state. a heat collecting section;
A solar heat collector characterized in that a heat radiation part that indirectly heats liquid in a hot water storage tank is polymerized and communicated with the heat radiation part, and the polymerized part is fitted and fixed to a heat collecting plate.