改进型微热管平板太阳能空气集热器性能分析

近年来,以空气作为换热介质的太阳能集热器越来越受到重视。本文以微热管阵列为核心传热元件,设计并搭建了改进型微热管平板太阳能空气集热器性能测试系统。通过实验研究了不同空气流量和不同进口温度对集热器集热性能的影响,获得相应参量对集热器的出口空气温度、集热效率和微热管阵列蒸发段温度的影响特性,分析对比了改进前后集热器的集热性能,得到了集热器效率的归一化曲线。实验结果表明,改进型微热管平板太阳能空气集热器在夏季240 m³/h空气流量时集热性能最佳,改进后的集热器相比原集热器在夏季的平均集热效率最高同比提升13.8%;在240 m³/h风量下的平均集热效率最高达到了74%,对应集热器的压降为9.2 Pa。

Performance Analysis of Improved Micro Heat Pipe Flat Solar Air Collector

In recent years, solar collectors which adopt air as a heat transfer fluid have received increasing attention. A new type of flat plate solar air collector was designed and constructed by taking micro-heat pipe array as the core heat transfer element in this work. The effects of different air flow rates and different inlet temperatures on the heat collecting performance of the collector were analyzed through experimental methods. Then, the influence characteristics of the corresponding parameters on the outlet temperature, the heat collection efficiency and the temperature of the evaporation section of the micro-heat pipe array were obtained, and the normalized curve of the collector efficiency was obtained according to the experimental data. The results showed that a best heat collecting performance of the improved micro heat pipe flat solar air collector was reached at 240 m³/h air flow in summer, and the average collector efficiency of the improved collector was 13.8% higher than that of the original collector in summer. The average heat collection efficiency at 240 m³/h was up to 74%, and the pressure drop corresponding to the collector was 9.2 Pa.