Common methods for cooling greenhouses include wet curtain fans, internal and external shading, spray cooling, skylight side windows, roof spraying, etc(50 cell seed starting trays). However, due to the large regional climate differences, the actual effects of different cooling methods are different(plastic tree pots wholesale). However, the installation height is different, and the same method will have different effects in the same area due to differences in use.
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Selecting a reasonable installation height has become an important consideration for new greenhouses(72 cell seedling trays wholesale). Producers often use a variety of methods to achieve a more ideal cooling effect. However, this cooling method also has disadvantages, which will reduce the amount of light entering the two walls of the greenhouse(small plastic terracotta pots), and then affect the supply of light sources to regional plants.(cheap plastic grow bowl wholesale suppliers chile)
Therefore, having a wet curtain fan in the upper layer is equivalent to a buffer layer between the cultivation layer and the extremely high temperature microclimate zone on the top(105 cell seedling trays wholesale). Wet curtain fan cooling system is a commonly used evaporation cooling method in production greenhouses, and it is used in most regions of China(herb plug trays). This method mainly uses the evaporation of water under high temperature to cool the air.
The cooling effect of wet curtain fan is also different(128 cell seedling trays wholesale). Aiming at the problem that the vertical temperature difference of the air temperature in the greenhouse exceeds 10 ℃ in summer, a comparative experiment on the effect of the installation height of the wet curtain fan on the cooling effect was specially conducted(2.5 inch succulent pot). They were installed in a three-story double-layer inflatable membrane greenhouse in North China.
(cheap plastic grow bowl wholesale suppliers chile)In relatively dry northern regions, the cooling ability of this method in summer has been generally verified(128 cell plastic propagation tray wholesale price). Some people in the industry also suggest using double-layer wet curtain fans to achieve better cooling effect. It has simple installation, low cost, and reliable operation, so it is widely used(plastic hanging baskets for sale). 0.9m from the ground, 2.7m from the top, and a fan installed at the south wall, 0.5m from the ground.
In another three-story greenhouse, the installation height of the wet curtain was increased from 0.9 meters to 2 meters, and the height of the fan was increased from 0.5 meters to 1 meter(162 cell seed starting trays). Properly increasing the position of the wet curtain fan will not only have a better cooling effect, but also reduce the temperature difference between the top and bottom of the cultivation layer(8.89cm square grow pots), which is more conducive to plant growth.
He Lianqiu, general manager of Hebei Hengshui Xinxing Flower Co., Ltd(200 cell seed starting trays). said that with a single-layer wet curtain fan, the higher the installation height, the better the cooling effect, but if the upper and lower double-layer wet curtain fans are installed, the temperature can be more flexibly adjusted(deep propagation trays). When the temperature in the greenhouse is not particularly high, turn on the upper wet curtain fan and the hot air will run upward.
At the same time, when it is turned on(15 cell trays bulk), it is possible to avoid the falling cold air from directly blowing to the cultivation layer, and to prevent the plants in some areas from being directly affected by cold wind and affecting the quality. When the temperature in the greenhouse is high(6.35cm square grow pots), turning on the upper and lower wet curtain fans will better control the temperature of the cultivation layer, and the cooling effect is more ideal.(cheap plastic grow bowl wholesale suppliers chile)
