Venlo型温室外遮阳和屋顶喷淋系统夏季降温效果

该文对荷兰Venlo型连栋温室夏季采用自然通风并结合遮阳网、室外屋顶喷淋的降温效果进行了实验研究。实验中对温室内空气温、湿度,太阳辐照度进行了测试,以比较外遮阳和屋顶喷淋的降温效果。结果表明:Venlo型温室夏季采用自然通风结合外遮阳和屋顶喷淋的降温措施后能够有效降低室内温度。不同于其它蒸发降温系统,屋顶喷淋没有造成温室内湿度的显著增加,室内的温度和湿度分布比较均匀。这种降温措施的能耗小,可以达到温室降温和降低温室夏季生产成本的双重目的

Effects of Shading and Roof Sprinkling in Venlo-Type Greenhouse in Summer

The effects of shading and roof sprinkling based on natural ventilation were experimentally studied in a Venlo-type multi-span greenhouse. Air temperature, humidity and solar radiation inside the greenhouse were measured to compare the cooling effect of shading and roof sprinkling. Under the experimental condition, the mean indoor air temperature was 2.1℃ lower than that outdoor, the largest air temperature difference was 4.4℃. The results showed that the measures of shading and roof sprinkling based on the natural ventilation could effectively cool down the greenhouse in summer. Shading, roof sprinkling and roof opening played different roles in the greenhouse. Different from other evaporative cooling system, the roof sprinkling system did not increase the air humidity inside the greenhouse. The distributions of air temperature and humidity inside the greenhouse were uniform under the experimental conditions. The methods could effectively reduce the air temperature and energy consumption in greenhouses.