1. Fan and wet curtain cooling system
First of all, ventilation is an extremely important measure. Open the vents reasonably to allow air to flow freely, so that the heat in the greenhouse can be taken away in time and the air can be kept fresh.
The greenhouse is mainly cooled in summer, and the fan with wet curtain is one of the main means of cooling the greenhouse in summer. The following is a brief introduction to how fans and wet curtains are used to cool down in summer.
1. Selection of fans: The fans used with wet curtains are generally negative pressure fans, which are usually set at the exhaust port to achieve the purpose of forced air circulation. Compared with the circulation fan, the negative pressure fan has a larger air volume and faster air circulation, and cooperates with wet curtains to achieve the purpose of cooling.
2. The principle of wet curtain cooling: The wet curtain must be used with the fan to penetrate the wind to achieve the cooling effect. When the dry and hot air outside passes through the wet curtain (wet mother), the wet curtain releases a large amount of water vapor. The water vapor will absorb the heat in the air and make the air moist and cool. This principle is air cooling.
3. Factors that affect the cooling effect of wet curtains:
(1) The paper quality of wet curtains is poor and the water absorption is poor
(2) The height of the wet curtain paper corrugation is not standard and reasonable. The higher the height, the smaller the unfolded area and the reduced cooling effect.
(3) The cleanliness of the wet curtain. No garbage can be stuffed into it, which will affect the air permeability and the uniformity of water flow.
(4) The higher the outdoor humidity, the smaller the cooling effect of the wet curtain。
2. Circulation fan
Purpose: Organize indoor air flow, make indoor wind uniform, and also have a certain dehumidification effect.
Features: small diameter, simple structure, usually small air volume, but long air supply distance.
Note: When using a negative pressure fan in summer, the circulation fan should be in the shutdown state.
3. Shading system
The shading system is divided into internal shading and external shading. The external shading system mainly refers to covering the outside of the greenhouse with a shading net. This method directly blocks solar radiation outside the greenhouse, which can effectively reduce the temperature inside the greenhouse. (The internal shading system is a shading system installed inside the greenhouse and on the top of the crop, usually with a relatively light aluminum foil shading net. Obviously, this shading system installed indoors cannot really reduce the indoor temperature, but only effectively prevents direct sunlight from hitting the crops and prevents them from being burned. Usually the internal shading system is used in conjunction with the external shading system.)
The external shading system uses tools such as shading nets to block excess sunlight outside the greenhouse, forming a shade to protect the crops in the greenhouse and keep the temperature in the greenhouse at a suitable temperature. This can effectively block direct sunlight from hitting the crops, while not affecting the natural ventilation in the greenhouse. The cooling effect is better than that of internal shading, but the external shading material is required to be strong, durable, less elastic, and anti-aging.
4. Micro-mist system
Spray cooling is also feasible. Spraying into the greenhouse mainly sprays water into the greenhouse in the form of mist particles. Such mist particles evaporate quickly and can quickly take away the heat in the air, and then discharge the humid air outside the greenhouse to achieve the purpose of rapid cooling.
In addition, roof spraying is also a way to spray water on the top of the greenhouse and use water evaporation to take away heat
Increasing the number of irrigation times is also a key link. Watering more appropriately to allow water to evaporate and absorb heat will help lower the temperature.
In short, through the comprehensive use of the above methods, the greenhouse can still maintain a relatively suitable temperature in continuous high temperature weather, provide a good environment for the growth of crops, and ensure the smooth progress of agricultural production.
Media Contact
Company Name: Shandong Hualiang Greenhouse Engineering Co., Ltd.
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Phone: +86 13371058037
Address:Yuanliu Village, Zhaode South Road
City: Qingzhou
State: Shandong
Country: China
Website: https://www.sinabeacon.com/