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夜空辐射器利用高红外发射率的辐射表面与低温夜空进行辐射换热而达到制冷的目的,为优化夜空辐射的换热设计,建立夜空辐射器的理论换热模型并进行验证,分析了辐射板发射率、室外风速、薄膜“风屏”对辐射换热系数、空气对流换热系数及制冷量的影响。研究结果表明:风速较小时,空气对流换热对辐射器制冷效果影响小,薄膜“风屏”的采用将削弱辐射换热,对制冷效果具有负面影响;风速较大时,空气对流换热对辐射器制冷效果影响大,薄膜“风屏”可降低对流换热的影响,对制冷效果具有正面影响。
The night sky radiators use the radiation surface of high infrared emissivity and the low temperature night sky to achieve the purpose of cooling. In order to optimize the heat exchange design of the night sky radiation, the theoretical heat transfer model of the night sky radiators is established and verified, Emissivity, outdoor wind speed, film “wind screen ” on radiation heat transfer coefficient, air convection heat transfer coefficient and cooling capacity. The results show that the air convection heat transfer has little effect on the radiator cooling effect when the wind speed is small, and the adoption of the film “wind screen” will weaken the radiation heat transfer, which has a negative impact on the cooling effect. When the wind speed is large, the air convection The effect of heat on the cooling effect of the radiator is large. The film “wind screen” can reduce the influence of convection heat transfer and have a positive effect on the cooling effect.