夏季不同通风方式对文洛型玻璃温室热环境的影响

Effects of Different Ventilation Modes in Summer on Venlo Glass Greenhouse Thermal Environment

通过试验方法对郑州地区文洛型玻璃温室在湿帘-风机机械通风和自然通风两种方式下室内热工参数的变化特性进行了研究。结果表明,在机械通风条件下,温室内沿垂直方向存在明显的温度梯度,水平面上靠近湿帘侧的温度低于靠近风机侧的温度;采用机械通风的方式可将温室内距地面高度1.2 m以下空气温度比室外降低3.5～9.0℃,垂直方向温度梯度较大,可考虑加入轴流风机加强温室内空气流动;而采用自然通风时,温室距地面高度1.2 m以下的平均温度比外界气温高3.8℃,在外界温度较低时自然通风的降温效果较好,适用于夏季初期。

The variation characteristics of Venlo glass greenhouse indoor thermal parameters under two ventilation modes,such as wet curtain fan mechanical ventilation and natural ventilation,were studied by the test method in Zhengzhou area.The results of the study indicated that there was a significant temperature gradient along the vertical direction in the greenhouse with mechanical ventilation,and the temperature near the wet curtain side was lower than the fan side.Using mechanical ventilation,the air temperature in the greenhouse below 1.2 m below the ground could be reduced by 3.5~9.0℃,but the temperature gradient in the vertical direction was large.It could be considered to add axial fans to enhance the air flow in the greenhouse.Under natural ventilation,the average temperature of the greenhouse below 1.2 m above the ground was 3.8℃higher than the outside temperature.When the outside temperature was low,the cooling effect of natural ventilation was better,which was suitable for the early summer.