Evaporative cooling pads plays an important role in the temperature control of agricultural development, especially in modern greenhouse and animal husbandry, the use of evaporative cooling pads is more and more, the following will be a few common pads use errors, remind friends to pay attention, otherwise not only can not play a cooling effect, but the opposite.

First understand the working principle of cooling pads:

cooling pads mainly uses the physical principle that water absorbs heat in the air during the process of water evaporation, so that the air temperature drops. In practice, the cooling pads is installed on one end of the gable wall or side wall of the closed building, and the fan is installed on the other end of the gable wall or side wall. The cooling fan pumps out indoor air, generates negative pressure and forces the outdoor air to flow through the porous cooling pads surface, so that a large amount of heat in the air is converted and forced to reduce the air entering the room by 10-15℃. And continue to introduce indoor heat prevention and cooling.

Water evaporation heat absorption is a very common physical phenomenon in nature, cooling pads cooling also uses this principle, cooling pads cooling system and negative pressure fan comprehensive application is the use of water evaporation heat absorption and air cooling thermal principle, fully demonstrates the three elements of water evaporation heat absorption principle:

1. Surface area of contact between water and air

2, the speed of air circulation

3. Temperature of the water itself

And the heat absorption efficiency of water evaporation is proportional to the above factors.

In the use of cooling padss, common mistakes are as follows:

Mistake 1: The lower the water temperature, the more obvious the cooling effect.

The higher the water temperature, the more intense the evaporation, the more heat taken away, and the more obvious the cooling effect. Therefore, room temperature water can achieve very good results, but also can be recycled to reduce water waste.

Therefore: when the relative humidity is lower than 80% and the temperature is lower than 35 ° C, the use of 20-25 ° C room temperature water to cool the pads circulating water has the best effect. If the water temperature is too low. With the decrease of evaporation efficiency, the relative humidity in the shed will increase, and too low water temperature can easily cause cold stress of ducks.

When the relative humidity is higher than 80% and the temperature is higher than 35 ° C (that is, when the temperature is high and the humidity is high), the evaporation efficiency decreases and the cooling effect of the cooling pads decreases due to the high relative humidity. At this time, water cooling can be used to cool down, and the groundwater with a lower temperature can be used to forcibly cool the incoming air through the pads (should be combined with increasing the wind speed) to achieve the purpose of adjusting the temperature in the shed. Therefore, the most important standard for water cooling is to look at humidity. Otherwise, ducks are very susceptible to cold.

Mistake 2: The more wet the pads, the more water is used, the more obvious the cooling effect

Under the action of the pump and gravity, the water flows down from the top, and the total area of the corrugated fiber surface of the cooling pads is equivalent to more than 10 times the appearance area of the pads, which can ensure the maximum contact area of the air and water film, and thus ensure the best cooling effect.

If the pads is too wet, and even the formation of long water, there will be long water blocking the pores of the pads, reducing the contact area between the pads and the air, and thereby reducing the cooling effect.

Mistake 3, cooling padss and ventilation Windows are used at the same time, the more uniform and stable the temperature

Due to the "air pressure difference" caused by the negative pressure fan, the outdoor air will quickly detour through the cooling pads and collide with the pads water film, so that the heat in the air is quickly absorbed by the large area of the water film. Once the "pressure difference" does not meet the requirements, the effect of the collision between the water film and the air will decrease, which will affect the cooling effect.

Therefore, the use of ventilation Windows and cooling padss at the same time will reduce the speed of air passing through the cooling padss, which will affect the cooling effect.

When the age is younger or the pads is used for the first time to cool down, the ventilation window can be used appropriately to mix the air intake, so that the ducks can gradually adapt to the pads. After 3-4 days of adaptation, the ducks should be switched to the full pads in time to give full play to the cooling effect of the pads.

Mistake 4. Use the cooling pads without cleaning it before use

Due to the debris blocking the pads holes, resulting in uneven distribution of water in the pads, while the wind can not penetrate the pads, resulting in a decrease in cooling and ventilation effect, can not achieve the purpose of cooling. Therefore, before using the cooling pads, be sure to do a good job of cleaning to ensure that nothing goes wrong.