Low-temperature solar energy selective absorption coating and preparation method thereof

Abstract

A low temperature solar energy selective absorption coating includes preparing Al or Cu of 0.02-0.06*10<-6>m thick on a glass surface as a substrate, depositing Ge-C of 0.03*10<-6>m-0.15*10<-6>m thick on the substrate as an infrared antireflection layer and preparing an Al-N composite absorbing material layer on the infrared antireflection layer. The invention adds the infrared antireflection layer through the novel solar energy adsorption coating, which is prepared through a multi-target magnetron sputtering technology. The coating is provided with a perfect property of absorbing solar long spectrums within the wavelength range of 0.3-2.5 Mu m. What is more important in that the substrate of the absorption coating is provided with high adsorption rate, good reflection effect on infrared rays which are longer than 8 Mu m and high permeability on infrared rays which are shorter than 8 Mu m. And when the temperature in a vacuum tube rises to 90-100 degree Celsius, the emission rate of the membrane layer can rapidly ascend to increase the heat losses of a heat collector and avoid a system to be overheated.

Description

technical field [0001] The invention relates to a solar energy utilization technology, in particular to a low-temperature solar energy selective absorption coating, and also relates to a preparation method of the coating. Background technique [0002] In 1985, Professor Yin Zhiqiang of Tsinghua University invented a solar selective absorption coating (ZL85100142), and vacuum tube solar water heaters were rapidly popularized in China. In 2006, the installed capacity of solar water heaters in China was 18 million m 2 , with a holding capacity of 90 million m 2 , The installation volume in 2005 was 75.8% of the world's, making China a veritable powerhouse in solar thermal utilization, among which vacuum tube collectors accounted for more than 90% of the Chinese market. However, in the international market (except China), the collectors that account for 90% of the market are flat-plate collectors. Comparing domestic and foreign markets, it can be found that China's vacuum tube ...

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Problems solved by technology

1~2m per household 2 , with a water tank, but in foreign countries, most of them are hot water heating composite systems, and each household needs about ten to twenty m 2 The heat collector is used to meet the heating requirements in winter, but in summer, there is no heating demand and the light is good. The energy obtained

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