JPS58200955A - Heat collector for solar heat - Google Patents

Abstract

PURPOSE:To diffuse a liquid-phase thermal medium supplied easily, to receive solar heat efficiently while lightening the heat collector for solar heat and to give durability by using a specific material as a heat receiving plate for the heat collector. CONSTITUTION:The liquid-phase thermal medium is subject to solar heat, which enters from an inlet 5 and is collected to a heat receiver 3, and discharged from an outlet 6. In this case, carbon fibers are used as the heat receiver 3, the liquid- phase thermal medium supplied is diffused easily by a capillarity of the carbon fibers, and the carbon fibers receive efficiently solar heat because they are black and have a wide heating surface area, and transmit heat over the liquid-phase thermal medium directly or indirectly. The heat collector is lightened and is excellent in durability because carbon fibers are light and are superior in weather resistance, heat resistance and corrosion resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solar heat collector configured by a transmitting body and a heat receiving body, which collects solar heat through sensible heat transfer, and relates to an improved solar heat collector using carbon fiber for the heat receiving body. .

The heat receiving body in a conventional solar heat collector is made of a metal such as aluminum, stainless steel, or copper in the form of a conduit, and sensible heat is transferred by circulating a liquid heat medium such as water inside the conduit.

Therefore, solar heat is indirectly transferred to the liquid phase heating medium via the metal of the heat receiving body. For this reason, a so-called selective absorption film is required on the metal surface of the heat receiving body, which has a higher temperature than the liquid phase heating medium, and there is a disadvantage that the heat collection efficiency is greatly affected by the performance of this selective absorption film. Furthermore, there is a drawback that the cost is increased by providing a selective absorption film on the metal surface of the heat receiving body.

Further, the use of metal for the heat receiving body has the disadvantage that the weight of the heat collector becomes large and furthermore, the problem of corrosion occurs.

The present inventors investigated various materials to solve the above-mentioned drawbacks, and as a result, by using carbon fiber for the heat receiving body, the above-mentioned drawbacks were solved at once, and the present invention was completed.

In other words, the supplied liquid heat medium easily diffuses due to the capillary phenomenon of carbon fibers, and carbon fibers are black and have a large heat transfer area, so they efficiently receive solar heat and directly or indirectly transfer it to the liquid. It is possible to transfer heat to a phase heating medium. Further, since carbon fiber is lightweight and has excellent weather resistance, heat resistance, and corrosion resistance, the use of carbon fiber for the heat receiving body has the advantage that the heat collector can be made lightweight and excellent in durability.

The carbon fibers used in the heat receiving body of the present invention may be those obtained by carbonizing Nalrose fibers, phenol resin fibers, and acrylonitrile fibers, and activated carbon fibers are more preferable.

In addition, pitch-based carbon fibers can also be used.

In addition, suitable forms of carbon fiber include woven fabric, nonwoven fabric, and paper.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a solar heat collector using the carbon fiber of the present invention as a heat receiving body will be described with reference to the drawings.

FIG. 1 is a partially cutaway perspective view of the solar heat collector η, and FIG. 2 is a sectional view of the main part thereof. There is a transmitting body on the upper part of the heat receiving body, and the transmitting body has a two-layer structure as shown in the figure, the first layer 1 of the transmitting body and the second layer of the transmitting body. The liquid phase heating medium enters through the inlet 5 and receives the solar heat collected by the heat receiving body.
FIG. 2 is a sectional view of the main part thereof.

1... Transmissive body first layer and... Transmissive body second layer 3... Heat receiving body 4... Heat insulating layer 5... Liquid Phase heat medium inlet 6 ...Liquid phase heat medium outlet L...Solar heat collector patent applicant Akira Ito, patent attorney for Toshiba Chemical Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] A solar heat collector that collects solar heat through sensible heat transfer, characterized in that carbon fiber is used as a heat receiver.