Heat collection plate of solar energy flat plate collector

Abstract

The invention discloses a heat collection plate of a solar energy flat plate collector. The heat collection plate of the solar energy flat plate collector comprises a heat collection plate body, wherein the heat collection plate body is internally provided with at least two cavities which are mutually parallel, the cavities and the heat collection plate body are integrally molded to form mutually-parallel tubular flow channels, and the upper surface of the heat collection plate body is coated or plated with a selective absorbing coating. The heat collection plate body is an extrusion forming aluminum alloy heat collection plate body, the cross sections of the tubular flow channels are square, rectangular, circular or oval. The two sides of the heat collection body are respectively provided with a connecting port capable of splicing the two adjacent heat collection plate bodies together. The connecting ports on the two sides of the heat collection plate body are respectively a connecting bulge and a connecting notch, or the connecting ports on the two sides of the heat collection plate body are respectively an upper connecting hook and a lower connecting hook. The heat collection plate of the solar energy flat plate collector has the advantages of simple structure, low cost, high heat exchange efficiency and long service life.

Description

technical field [0001] The invention relates to a solar flat heat collector, in particular to a heat collecting plate of the solar flat heat collector. Background technique [0002] The heat-collecting strip of the flat-panel collector is the core component of the flat-panel solar energy, which plays a key role in the thermal efficiency of the flat-panel solar energy. At present, the most commonly used heat-collecting strip structure types at home and abroad are tube-sheet type and wing-tube type. The tube-sheet heat-collecting strip is a heat-collecting strip formed by laser welding or ultrasonic welding of copper tubes and heat-absorbing fins. The contact between the circular copper tube and the flat heat-absorbing fins is a straight line, and its contact area is small and the thermal resistance is large, which is not conducive to heat exchange, thereby affecting the efficiency of the entire heat collector. The copper-aluminum composite heat collection strip is a wing tu...

AI Technical Summary

Problems solved by technology

The contact between the circular copper tube and the flat heat-absorbing fins is a straight line. The contact area is small and the thermal resistance is large, which is not conducive to heat exchange, thus affecting the efficiency of the entire collector.

The copper-aluminum composite heat collection strip is a wing tube type, which can solve the problem of small contact area, but the structure is to press the copper tube and the aluminum wing together by external force, most of which are in physical contact, because they are made of different materials Compression, thermal expansion and contraction coefficients are different, so the long-term thermal expansion and contraction, the contact area between the two will gradually become smaller, resulting in a decrease in heat collection efficiency. It is difficult to be completely flat, which will affect the appearance of the flat plate collector

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