空气循环式塑料大棚蓄热除湿装置及运行效果
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摘要: 根据湿热空气遇到固体低温表面产生冷凝效应，其水汽凝结为水，同时放出潜热的原理，利用冬季晴天时塑料大棚内气温高，湿度大，而地温低的环境条件，在塑料大棚内设计、建造和安装了一套空气循环式蓄热除湿装置，晴天将塑料大棚内的湿热空气用轴流式风机强制性地抽送入安装在土壤中的多个冷凝管道，并使其从塑料大棚内另一端的出口排出，再回到塑料大棚内，形成循环，达到既除湿又不降温的目的。观测分析结果表明，与对照塑料大棚相比，试验塑料大棚内1.7 m高度的相对湿度明显降低，大部分时间段达到差异显著（P＜0.05）或极显著（P＜0.01）水平；晴天各个正点时刻，冷凝塑料大棚内1.7 m高度平均气温和20 cm地温均高于对照，分别高出0.1～3.0℃、1.4～1.7℃。Abstract: According to the principle that water vapor condenses and the latent heat is released when the hot-humid air encounters the surface of low-temperature solid object and making use of the environmental conditions such as high air temperature, high air humidity, low soil temperature inside the plastic covered tunnel greenhouse in sunny winter, a set of air-circulating and regenerative dehumidification device was designed and installed. By which, the hot-humid air of top-mandatory level was transported into the various underground channels by axial fan, and was exhausted from another exit. Thus the indoor air cycle was formed getting to the aim of dehumidification without the temperature drop. The observation results showed that compared with the control plastic greenhouse, air relative humidity at the height of 1.7 meters inside the experimental plastic greenhouse decreased apparently, reaching a significant level (P＜0.05) or a greatly significant level (P＜0.01) within most periods in January. At all punctual moments in the sunshine, the mean values of air temperatures at the height of 1.7 meters and the soil temperatures at the depth of 20 cm inside the experimental plastic greenhouse were higher than those inside the control plastic greenhouse, over 0.1～3.0℃, 1.4～1.7℃ respectively.
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