Several principles of cooling a glass greenhouse:

‌Heat convection and air exchange‌

Remove hot air and replenish cold air through natural ventilation or mechanical ventilation, and use air flow to take away heat‌.

‌Light and heat barrier‌

The shading system (external shading net, internal shading curtain) blocks part of the direct sunlight and reduces the heat accumulation in the greenhouse‌.

‌Evaporation heat absorption‌

Water absorbs heat during evaporation, including wet curtain fan system, spray cooling, roof spraying and other methods are based on this principle‌.

‌Heat conduction and radiation reflection‌

Through groundwater circulation or roof spraying white coating, use water heat conduction or reflect sunlight to reduce the temperature‌.

Common cooling methods and operations

‌Natural ventilation‌

Air convection is formed through top windows and side windows, without additional equipment, suitable for environments with outdoor temperature ≤30℃‌.

‌Mechanical ventilation‌

Installing fans to force exhaust can reduce the temperature by 3-5℃, but it needs to be combined with wet curtains or spray systems to improve the effect‌.

‌Shading system‌

‌External sunshade net‌: Covering the outside of the greenhouse, with a shading rate of 50%-70%, the cooling effect is significant‌.

‌Internal sunshade‌: Such as aluminum foil curtain, with a shading rate of 30%-50%, flexible adjustment of lighting requirements‌.

‌Wet curtain-fan system‌

The wet curtain is installed at the air inlet, and the fan is placed at the air outlet. Water evaporation is used to cool down, and the cost is about 10-15 yuan/㎡‌.

‌Spray/micro-mist cooling‌

High-pressure spray equipment sprays tiny water mist, which evaporates and cools down by 5-6℃, and the cost is about 5-10 yuan/㎡‌.

‌Roof spray‌

Spraying water on the roof, cooling through water evaporation and heat conduction, simple and easy, but attention should be paid to water consumption‌.

‌Groundwater circulation‌

Using underground cold water to exchange heat with air, the cooling effect is stable but the initial equipment cost is high‌67.

Install scattering glass on the top of the greenhouse

The scattering glass can disperse the incident light, so that the light is evenly covered inside the greenhouse, which can effectively reduce the leaf surface temperature by 3-5℃;

The diffuse glass and AR-coated diffuse glass produced by Yuhua have cooperated with many large commercial greenhouses in agriculture, horticulture, nurseries and experiments. We have cooperated with large greenhouse project companies such as Havecon, Van Der Hoeven, Kubo, etc. for many years. Yuhua greenhouse glass has a light transmittance of up to 99%, and haze 5/10/20/30/50/70/75 greenhouse diffuse glass is available!

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