Experimental study on thermal performance research of a trough solar air collector
In order to study the thermal performance of trough solar air collectors used solar greenhouses, a trough solar air collector was designed based on TracePro optical simulation software, and experimental research and analysis was conducted for the influence of different factors on thermal performance. The experimental results show that the air flow rate in the tube has the same effect on the thermal efficiency and heat collection of collector. Under different flow rates, there is an optimum flow rate of 4.4 m/s, which makes the heat collector and heat collection efficiency of the collector the largest. It is 373.2 W, and the heat collecting efficiency is 25％. At this time, the heat collecting performance is the best. For different solar irradiances, before the noon time, the greater the solar irradiance, the greater the heat collecting efficiency of the collector. After the noon time, the collector efficiency of the collector remains basically the unchanged, and the collector set after 15:40, the thermal efficiency is gradually reduced. When the solar irradiance is the same as the flow rate in the tube, the higher the outdoor temperature, the greater the heat collecting efficiency of the collector, and the better the heat collecting performance. The air temperature in the heat collecting tube increases continuously along the outlet direction of the heat collecting tube, and the greater the solar irradiance, the higher the air temperature at the same position of the heat collecting tube. The results of this study can provide a reference for the application of such trough solar air collectors in solar greenhouses.
trough solar air collectorthermal performancesolar greenhouseexperimental study
国家科技期刊平台
NSTL
万方数据
维普
