日光温室放风方式相关指标分析

通过调研从放风的操作难易程度、对棚膜的磨损程度及通风量大小等指标分析了目前温室的几种常用放风方式.比较了第5种类型和第6种类型放风方式的特点,计算了自然通风条件下日光温室所需的通风量,并依据"质量守恒原理"计算了在热压作用下,以上2种通风方式的风口面积.结果表明:第6种类型放风方式的筒口半径为 25cm,风筒高度为50 cm,屋脊处沿东西方向的布置间距为100cm.前底脚处通风口的有效宽度为20cm条件下基本能满足通风要求.该方法具有操作灵活方便,避免磨损棚膜,利于保护棚膜等优点.第5种类型放风方式在满足屋脊处和前底脚处风口最小宽度为23 cm条件下基本能满足通风要求,该方式能保持棚膜始终处于张紧的状态,不影响采光,磨损棚膜易于更换.

Analysis on the Relative Indexes of Ventilation Modes in Solar Greenhouse

The ventilation gate was arranged in solar greenhouse to ventile,cool and dehumidify.The forms,position and areas of ventilation gate are different,so the effects are different among them.In this paper,the degree of difficulty or easiness of ventilation,the wear degree of greenhouse film and ventilation rate were analyzed by investigating the ventilation modes in modern greenhouse.The two ventilation modes were emphatically analyzed,which were the fifth and sixth types of the paper.The sixth type was operated flexibly and conveniently,and the greenhouse film was also protected.The fifth type coule make greenhouse film tension so that benefit lighting.And it was easy to change greenhouse film.It was showed that the sixth type is the most ideal mode whose venting duct radius and height were respectively 25 cm and 50 cm.The distance from the east of greenhouse ridge to the west was 100 cm and the width of venting duct of front bottom angle was 20 cm.The basic ventilation requirement was satisfied with the above parameters.Finally it was displayed that the fifth type must keep the minimum width 23cm of greenhouse ridge and front bottom angle separately to satisfy ventilation requirement.