防虫网对节能日光温室通风性能影响的研究

自然通风是决定日光节能温室质能平衡和调节微生态环境平衡的重要因素。为了提高节能日光温室的环境管理和结构设计水平,有必要研究防虫网对日光温室通风性能的影响,以提高日光温室的绿色产品生产率。因此,运用气体衰减示踪技术和数理统计理论,研究了日光温室不同形式通风机构的通风性能。试验研究表明在通风口处装设防虫网会显著地减少日光温室的通风率,有时可高达50%。研究还表明,无论装设有无防虫网,卷膜通风机构比拉膜(推膜)通风机构都具有较大的通风率,有时前者是后者的1.4倍左右。

Effect of Insect-Proof Screen on Solar Greenhouse Ventilation

Convective transfers determine, for a large part, the energy and mass balances, which regulate the microclimate inside a greenhouse. In order to improve the standard of microclimate management and structure design of solar greenhouse, one of the most common greenhouses in China, it is necessary to study the effect of insect proof screen on solar greenhouse ventilation so as to raise productivity of green products in greenhouse. The objective of this work is to determine and model the air exchange rate of solar greenhouse with insect proof screen over the vents. Experimental study using tracer gas technique and decay rate method were conducted in solar greenhouse with two types of ventilation openings, one with sheet parting roof vent and the other with rolling up roof vent. It was found that rolling up vent has a higher ventilation rate (1.4 times) than the sheet parting vent, in the case of both with or without the insect proof screen. And experiments have confined a significant reduction in the ventilation rate when an insect proof screen is fitted to the vent (about 50%).