Mesotherm solar thermal collector

Abstract

The invention discloses a mesotherm solar thermal collector which comprises a groove type collecting mirror in a U-shaped structure, and the groove type collecting mirror is provided with an involute segment and a parabolic segment, wherein the involute segment and the parabolic segment form a composite type line. A heat collecting assembly, a left pipe base assembly, a right pipe base assembly, a left support frame and a right support frame are arranged on a base circle portion of the involute segment of the collecting mirror. The collecting mirror is integrated by a composite bonding between a surface mirror and matrix glass. The surface mirror is a back surface mirror of which the back face of the glass matrix is plated with a sliver reflective film layer and a copper protective film layer from the inner to the outer in sequence. Glass cover plates are respectively arranged on a groove mouth and open mouth ends of two sides of the groove type collecting mirror. The outer surface of each glass cover plate is plated with a sunlight antireflection film layer and a self-cleaning film layer and the inner surface of each glass cover plate is plated with the sunlight antireflection film layer. The mesotherm solar thermal collector has the advantages of being reasonable in structure, high in reflecting rate, high in heat-collecting efficiency, long in service life and the like.

Description

technical field [0001] The invention relates to a medium-temperature solar heat collector, which belongs to the technology of solar heat collectors. Background technique [0002] The medium-temperature solar thermal collector of the present invention is a solar thermal collector in which the heating temperature of the heat-collecting medium reaches the range of 100-200°C. [0003] In the prior art, such as the solar heat collector disclosed in Chinese patent 200410064610.4, the concentrator with a U-shaped cross-section formed by the transition connection between the involute segment and the parabolic segment on both sides and arranged symmetrically is arranged on the involute of the concentrator. The heat collecting tube assembly at the center of the base circle of the line segment, and the support frame used to support the concentrator and the heat collecting tube assembly, this type of solar collector is suitable for living facilities such as steaming rice and hot water s...

AI Technical Summary

Problems solved by technology

[0004] Yet this type of solar heat collector of the prior art still has many structural deficiencies, and its main ones are: one is that the described concentrator adopts the structure of adding a film on a glass fiber reinforced plastic base or adding a film on an aluminum base. The fiberglass base is easy to age, deform or crack, while the aluminum base has poor weather resistance. In addition, it is very troublesome to apply the film. The adhesion of the film layer is not only unreliable, but also contains a lot of air bubbles, which directly reduces the reflectivity of the condenser. ; Its 2nd is that the converging mirror of prior art is all front surface mirrors, and promptly described reflective layer is located at glass fiber reinforced plastic base or aluminum base front surface, because described reflective layer is exposed to external space, and will face to bear the corrosion and corrosion of atmosphere directly. temperature difference and the invasion of harsh environments such as wind and rain, flying sand and rocks; the third is that the notch end and both side ends of the prior art condenser mirror are all connected with the external space. The inner cavity is not only easy to lose heat, but also easily damaged by external factors, and manual cleaning is also very troublesome

In view of the structural insufficiency, the reflectance of the prior art concentrating lens is less than or equal to 80%, and it decreases year by year, and the reflectance drops to 30% when used for 6 years

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