平板型太阳能集热器吸热膜层老化性能分析

Aging Performance Analysis of Heat Absorption Film of Flat Plate Solar Collector

对采用蓝膜、黑铬膜层及阳极氧化膜层的平板集热器进行了高低温交变空晒老化试验研究.在自然环境工况条件下,经过累计辐照量810 MJ/m^2高低温交变空晒老化后,采用三种膜层的集热器效率分别由80.15%、78.43%和75.65%下降到77.56%、70.92%和69.88%,且三种膜层的吸收率分别降低了1.08%、2.11%和1.06%,发射率分别增加了50%、33.33%和33.33%.150℃持续高温老化96h后,三种膜层的发射率分别增加了25%、8.33%和6.67%.研究结果表明,高低温交变空晒老化对集热器性能及膜层的吸收率与发射率均有一定的影响,而持续高温老化只对膜层的发射率有影响.

The aging performance experiments of flat plate solar collectors with the blue film,the black chrome film and the anodic oxide film were carried out stagnation in high and low temperature alternating.The results showed that the collector efficiencies of the three heat absorption films respectively decreased from 80.15%,78.43%,75.65% to 77.56%,70.92% and 69.88% after the cumulative amount of irradiation reaches to 810 MJ/m^2.Meanwhile,the absorptivity of the heat absorption films dropped by 1.08%,2.11%,1.06% and the emissivity increased by 50%,33.33% and 33.33%.Continuous high temperature aging experiments on the three heat absorption films were investigated.The results showed that the emissivity respectively increased by 25%,8.33% and 6.67% after 96 hours aging test under 150℃ continuous high temperature.The high and low temperature alternating aging test had a great influence on the thermal performance of flat plate solar collector and the absorptivity and emissivity of the heat absorption films.But the continuous high temperature aging test only affected the emissivity of the films.