Fan wet curtain installation
The author:AdminPopularity:325release
time:2017-08-09
In the design of ventilation and cooling system, how to install and calculate the fan wet curtain is a relatively important issue.
1, the greenhouse in the fan wet curtain ventilation system can be formed in the air inlet at a sufficient wind speed, so that outdoor air through the wet curtain device into the room, and for the animals and plants to provide continuous flow of air, due to moisture in the wet curtain evaporation Air is cooled into the greenhouse, the flow of air through the animal and plant areas, the indoor heat, temperature and humidity increased, and then through the fan outdoors, improve the air flow rate or limit the length of the greenhouse can control the air temperature and humidity rise rate, the general ventilation design In the air exchange rate of 1 / min, the ventilation temperature of the air temperature does not change more than 6 ℃, in order to achieve the best ventilation effect, the inlet and outlet between the spacing should be less than 46m.
2, the fan wet curtain with a typical spiral blade fan, in order to achieve effective cooling, in the fan on the opposite side of the wall should have the appropriate size of the air inlet, although the operation of a small number of large wind turbines than the operation of several small fan energy efficiency is higher, But in order to make the temperature uniform and provide a uniform air flow, usually still use multiple small fans, these small fan layout spacing of not more than 8m, the use of multiple small fans there is an advantage is a fan failure, the other fans still can Maintain ventilation.
3, the fan wet curtain is generally installed in the leeward wall, the air inlet is located in the wind on the wall, this arrangement can make the main fan of the wind to promote the air into the greenhouse, thereby improving the efficiency of the fan, when the fan must be installed in the wind Surface of the wall when the fan air flow and motor power to increase 10% -15%.
4, the fan wet curtain control, when using multiple fans of the fan wet curtain cooling system, the fan and wet curtain can be set according to the temperature of the composition of the stage of operation, the operation of the fan should be staggered to get a uniform airflow, In the first stage, one of the three fans runs, and as the temperature increases, the second and third stages of the fan are turned on and run down with the temperature drop, and sometimes the speed motor is needed to increase Operating efficiency, only in the full fan are running and not achieve the desired cooling effect, only to open the wet curtain system to do the fourth stage of the cooling facilities.