夜间日光温室表面冷凝及传热

Nocturnal Condensation and Heat Transfer on Solar Greenhouse Surfaces

测试冬季夜间日光温室内环境因子及温室表面热流量并计算分析温室表面的冷凝及其潜热。结果表明:温室前屋面在盖帘期间及后坡在早晨揭帘前有冷凝现象,墙体、土壤表面无冷凝现象,后坡在盖帘后夜间只有部分时段有冷凝现象。当室外温度较高时表面冷凝释放的潜热量大,2月20日晚盖帘后前屋面冷凝潜热量是显热量的1.7倍,在2月20日早晨揭帘前前屋面及后坡面冷凝潜热量分别是显热量的87.1%及95.2%。

Solar greenhouse microclimates and surface heat fluxes were measured and analyzed for condensation and latent heat during night in clear days. Condensation happened overrfight for south roof surface and during morning and late night for north roof surface with no condensation on wall and soil surfaces. Calculation showed that the much more concentration occurred overnight in the warmer day. The latent heat from south roof was 1.7 times of sensible heat after the thermal curtain unrolled during night and 87. 7% before rolled in the morning on February 20, and same trend for north roof with the latent heat was 95.2% of the sensible heat before rolled in the morning on February 20.