Installation method of wet curtain fan

In the design of the ventilation and cooling system, how to install and calculate the fan wet curtain reasonably is a problem that everyone is concerned about.

1. The fan wet curtain ventilation system in the greenhouse can form a sufficient wind speed at the air inlet, so that the outdoor air enters the room through the wet curtain device, and provides continuous flowing air for animals and plants. After the air is cooled, it enters the greenhouse. When it flows through the animal and plant area, the air absorbs the indoor heat, the temperature and humidity increase, and then it is discharged to the outside through the fan. Increasing the air flow rate or limiting the length of the greenhouse can control the rate of air temperature and humidity rise. General ventilation design Zhongdu adopts an air exchange rate of 1 time/min, and the air temperature change under this ventilation volume does not exceed 6 °C. In order to achieve a better ventilation effect, the distance between the air inlet and the air outlet should be less than 46m.

2. The fan wet curtain adopts a typical spiral blade fan. In order to achieve effective cooling, there should be an air inlet of an appropriate size on the wall opposite the fan. Although the energy efficiency ratio of running a small number of large fans is higher than that of running multiple small fans, However, in order to make the temperature uniform and provide uniform airflow, multiple small fans are usually still used. The spacing of these small fans is not more than 8m. Another advantage of using multiple small fans is that if one fan fails, other fans can still be used. Maintain ventilation.

3. The fan wet curtain is generally installed on the leeward wall, and the air inlet is located on the windward wall. This arrangement can make the wind of the main fan push the air into the greenhouse, thereby improving the efficiency of the fan. When the fan needs to be installed on the windward side When the wall is installed, the air volume of the fan and the power of the motor should be increased by 10%-15%.

4. Control of fan wet pad, when using a fan wet pad cooling system with multiple fans, the fan and wet pad can be set to operate in stages according to the change of temperature, and the fans running in stages should be staggered to obtain uniform airflow, for example In the first stage, one fan in every three runs. As the temperature rises, the fans in the second and third stages are turned on at one time, and turned off sequentially as the temperature drops. Sometimes a speed-regulated motor is required to improve the operating efficiency. Only after all the fans are running and the ideal cooling effect is not achieved, the wet curtain system is turned on as a four-stage cooling facility.