Vacuum heat collector

Abstract

The invention discloses a vacuum heat collector comprising a housing, a U-shape heat collecting tube, and a heat absorbing plate; the housing comprises a facing-light surface and a back-light surface and is provided with a vacuum suction nozzle; the U-shape heat collecting tube is fixedly installed inside the housing; the heat absorbing plate is installed between the facing-light surface of the housing and the U-shape heat collecting tube; the side, facing the facing-light surface of the housing of the heat absorbing plate is coated with selective absorbing coating, the other side of the heat absorbing plate is tightly fitted to the U-shape heat collecting tube; an enclosed vacuum environment can be formed inside the housing; sunshine irradiates on the heat absorbing plate through the facing-light surface of the housing and the heat absorbed by the heat absorbing plate can be used for heating heat transferring medium inside the U-shape heat collecting tube. The heat collector is provided with a heat absorbing plate which is coated with selective absorbing coating having high solar absorption efficiency and low reflection efficiency; the surface area of the heat absorbing plate is large and the heat absorbed by the heat absorbing plate can be quickly transferred to the U-shape heat collecting tube; a heat radiation shielding layer is used for reducing the heat radiation loss of the heat collector.

Description

technical field [0001] The invention relates to the technical field of solar energy, in particular to a U-shaped vacuum heat collecting tube. Background technique [0002] In the heat utilization of solar energy, the key is to convert the sun's radiant energy into heat energy. Since solar energy is scattered, it must be concentrated. A solar collector is a device used to absorb solar radiation to convert it into heat energy and transfer it to a heat medium. Although it is not a terminal product directly oriented to consumers, a solar collector is a key component of various solar heat utilization systems . Whether it is solar water heaters, solar cookers, active solar houses, solar greenhouses or solar drying, solar industrial heating, solar thermal power generation, etc., solar collectors are inseparable, and solar collectors are used as the power or core components of the system. of. The common ones are flat-plate, vacuum tube and concentrating solar collectors. [000...

AI Technical Summary

Problems solved by technology

Usually, the heat collecting tube adopts U-shaped thin tubes, and the surface of these U-shaped thin tubes is mostly coated with selective absorption coating, the manufacturing process is complicated, and multiple U-shaped thin tubes are connected in parallel in order to obtain a large heat absorption area. The method makes the structure of the heat collecting tube complicated, and the production and installation costs are relatively high

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