摘要
设计了几种辐射致冷装置,以空气作为制冷剂,利用聚酯(PET)薄膜作为辐射体材料,低密度聚乙烯膜(LDPE)作为盖板材料,进行夜间实验。在静态对比实验中,装置水平放置的实验结果表明,PET与环境的最大温差为9.9℃,装置内空气与环境的最大温差为7.2℃;装置倾斜放置?,在相同的夜晚条件下,倾斜45°角得到的致冷效果最佳,内部空气与环境的最大温差为7.6℃。在不同风速的连续抽气实验中,风速为0.6m/s～0.8m/s?,装置的出口空气与环境的温差最大,最大为5.2℃,且整夜温差相对较平稳。通过计算,装置的有效致冷功率为73.6W/m2。
The radiation cooling is experimentally studied with air as the cooling medium,polyester（PET） as radiative material and low-density polyethylene（LDPE） film as transparent cover.The experimental results with horizontal device indicate that the maximum temperature difference between PET and the environment is 9.9℃,and that between internal air and the environment is 7.2℃.In the same climatic condition for the device tilted,the results for 45° tilt angle are the best,the maximum temperature difference between internal air and the environment is 7.6℃.In the air flow experiment,the maximum temperature difference is obtained at wind speed of 0.6m/s～0.8m/s,the temperature difference between the outlet and environment is 5.2℃,and the stable temperature difference is obtained throughout the night.By calculation,the effective cooling power of the device is 73.6 W/m2.
出处
《制冷学报》
CAS
CSCD
北大核心
2011年第4期48-52,共5页
Journal of Refrigeration
关键词
热工学
辐射致冷
PET薄膜
致冷功率
温差
Pyrology
Radiation cooling
PET film
Cooling power
Temperature difference
