Stoves and furnaces – Tool having fluid fuel burner – Soldering iron
Patent
1984-04-13
1985-12-03
Page, Thurman K.
Stoves and furnaces
Tool having fluid fuel burner
Soldering iron
126901, 428414, 428416, 428913, 4284111, F24J 302
Patent
active
045560480
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a solar heat collector that can be utilized for domestic hot water supply and other purposes, which more particularly relates to a solar heat collector comprising heat collecting panels, principally composed of a polyolefin resin, the surfaces of which have been subjected to a selective absorption treatment.
BACKGROUND OF THE INVENTION
Desirable properties for a heat collecting surface, where solar energy is collected as heat, include solar selective absorptivity, that is, a radiation spectrum specificity of the heat collecting surface which allows the maximum absorption of solar energy in the ultraviolet, visible and near infrared regions while minimizing the radiation loss from the surface in the infrared region which dominates the radiation spectrum.
Various techniques such as, for example, plating and coating have been known for applying a solar selective absorption treatment on a metallic heat collecting panel.
A plastic heat collecting panel, on the other hand, has been produced by blow molding a polyolefin resin, such as high-density polyethylene filled with carbon black or like material. However, it was difficult to apply a solar selective absorbing treatment on such plastic heat collecting panel.
There may be cited the following two reasons for which it has been difficult to achieve said solar selective absorption treatment on a polyolefin resin heat collecting panel.
The first reason is that the formation of a coating on polyolefin resin is extremely difficult because of the non-adhesiveness of such resin.
The second reason is that the conventional selective absorption treatments, which have been applied to metallic heat collecting panels all make use of the fact that the metallic heat collecting panels have a low thermal emittance. However, the techniques used for such metallic panels can not be applied to resin heat collecting panels because such resin panels have a high thermal emittance.
SUMMARY OF THE INVENTION
The first object of the present invention, therefore, is to apply a solar selective absorption treatment onto the surface of a polyolefin resin heat collecting panel, which is light in weight and excellent in corrosion resistance in comparison with metal panels and to thereby improve the efficiency of the solar heat collector.
The second object of the present invention is to practice such solar selective absorption treatment using a coating system with excellent productivity to provide a solar heat collector with excellent performance at low cost.
The third object of the present invention is to apply long term protection to the resin surface, which is susceptible to deterioration by ultraviolet rays under the harsh environment in which the solar heat collector is used, to provide a solar heat collector with excellent durability.
In order to accomplish these objects, according to the present invention a first coating principally composed of a thermoplastic acrylic resin or an alkyd resin, a chlorinated polyolefin resin, an epoxy resin and a metallic powder is formed on a polyolefin resin base, and further a second coating layer having a solar selective absorptivity is formed on said first coating layer. The second coating layer is principally composed of at least one oxide or compound oxide of a metal or metals selected from the group consisting of Fe, Mn, Cu, Cr, Co and Ni and at least one resin selected from the group consisting of acrylic resin, fluorine resin, urethane resin and alkyd resin and has a thickness of 5 .mu.m or less.
According to this structure, the first coating layer provides the effect of inhibiting radiation of infrared rays and the second coating layer provides solar selective absorptivity to the heat collecting surface, as this second coating layer is relatively pervious to infrared rays and is very effective in absorbing the sunlight.
Since said coatings are applied by painting with a coating mixture, mass production is possible at low cost.
Also, the adhesion between the base and the coating is splendid, as a surface unevenness o
REFERENCES:
patent: 2979418 (1961-04-01), Didner
patent: 4206248 (1980-06-01), Schmidlin
patent: 4230768 (1980-10-01), Hamada et al.
Fukuda Hiroshi
Kaneko Yasunori
Maki Masao
Matsushita Electric - Industrial Co., Ltd.
Page Thurman K.
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