All-glass heat pipe medium-temperature evacuated solar collecting pipe

Abstract

The invention provides an all-glass heat pipe medium-temperature evacuated solar collecting pipe which comprises a cover glass pipe, an inner glass pipe and a condensation section. A intermediate-infrared-reflection anti-reflective coating is arranged on the inner surface of the cover glass pipe, and the intermediate-infrared-reflection anti-reflective coating comprises a silicon-based oxide filmand a intermediate-infrared-reflection coating. The silicon-based oxide film is attached to the inner surface of the cover glass pipe, and the intermediate-infrared-reflection coating is attached to the inner side of the silicon-based oxide film. The anti-reflection function can be achieved on sunlight penetrating through the cover glass pipe, and the transmittance of the cover glass pipe is further improved by about 3%. 5-15 [mu]m spectrums emitted by a selective absorption coating can be reflected back to a heat collection pipe, the contrast emission ratio is 0.06, the emission energy can bereduced by about 50% and the comprehensive emission ratio can be reduced to about 3% under the action of the intermediate-infrared-reflection coating, and the emission heat loss of the selective absorption coating can be effectively reduced. At the cold temperature of -15 DEG C, the comprehensive heat collection performance and effective heat gain of the heat collection pipe in the working rangeof 60-90 DEG C are effectively improved.

Description

technical field [0001] The invention belongs to the field of solar heat utilization, and relates to a medium-temperature vacuum solar heat collection tube of an all-glass heat pipe. Background technique [0002] For many years, solar thermal household heating mainly adopts ordinary all-glass vacuum solar collector tubes and collectors. Ordinary all-glass vacuum solar collector tubes have been used as solar water heater collector tube components, and the conventional operating temperature is not higher than 50°C to meet the requirements. Generally, heating requires that the heating temperature is not lower than 60°C, and the return water temperature is not lower than 50°C. Referring to the technical requirements of GB / T17049-2005 all-glass vacuum solar collector tube, the absorption ratio α≥0.86, the emission ratio τ≤0.08, and the heat loss ≤0.85 can meet the basic requirements for conventional solar water heating. However, limited by the cold winter conditions in the north...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an all-glass heat pipe medium-temperature vacuum solar heat collector, which solves the problems of low efficiency and antifreeze in the application of heat collectors in the northern winter clean heating market

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