The Selection Of Greenhouse Strokes And Wet Curtains

Whenever wet curtain cooling system is widely used in greenhouses. How to choose the cooling system more skillfully so that your plants can breathe freely and freely?

Choice principle

The choice of wet curtain size should make the wet curtain system achieve a good effect. Usually in the flower production greenhouse, 10 cm thick or 15 cm thick fibrous wet curtain is often used. The 10 cm thick fiber wet curtain runs well at 76 meters per minute through the air speed of the wet curtain. The 15 cm thick paper wet curtain requires the air speed to be 122 meters/minute.

In addition to considering the geographical location and climatic conditions of which thick wet curtains to choose, you should also see the distance of the wet curtain and fan of the greenhouse and the sensitivity of the temperature for the temperature. The greater the distance between the fan and the wet curtain (generally more than 32 meters), it is recommended to use 15 cm thick wet curtains; if the cultivated flowers are more sensitive to the temperature of the greenhouse, the ability to withstand high temperatures is poor. It is recommended to use 15 cm thick. Wet curtain. Conversely, if the distance between the humid curtains and the fan of the room is small or the flower is sensitive to temperature, the 10 cm thick wet curtain can be used.

From an economic consideration, the price of 10 cm thick wet curtain is below 15 cm thick wet curtain, which is only 2/3 of its price.

In addition, the larger the air inlet size of the wet curtain, the better. Because the size of the air inlet is too small, it will increase static pressure, which greatly reduces the efficiency of the fan and increases power consumption.

Methods to estimate the traditional greenhouse cooling equipment:

1. The necessary ventilation volume of the greenhouse = the length of the greenhouse × 8cfm (Note: CFM is an air flow unit, that is, cubic feet per minute).

2. Estimate the wet curtain area required. If you choose a 10 cm thick wet curtain, the area of the wet curtain = the necessary ventilation/wind speed of the greenhouse is 250. If the 15 cm thick wet curtain is used, the area of the wet curtain = the necessary ventilation/wind speed of the greenhouse 400. The area of the wet curtain obtained by calculating the wet curtain is divided into the wet wall length covered by the wet curtain to obtain the height of the wet curtain. In humid climate, the air volume and wet curtain size increases by 20%. According to the principle of hot air above and cold air, the wet curtain of the fan should be installed above the greenhouse, as is the greenhouse built in the early days.