The water curtain focuses on several data:
1. The recommended temperature for temperature control is lower than 28 ℃, using a fan for cooling, and higher than 28 ℃, using a water curtain for cooling. The water passing temperature of the water curtain is preferably between 20 ℃ and 26 ℃. Using circulating water, very cool water, evaporation is very slow, and it is generally believed that the water curtain can reduce the body temperature by 4-7 degrees.
Depending on your target temperature, determine the appropriate number of fans to operate, such as 18000 feathers, 30 day old target temperature 22, chicken house temperature 28.5, using a water curtain plan to reduce the body sensation by 4 degrees, and humidity to increase the body sensation by 1 degree. Consider reducing the wind speed by 3 degrees to ensure that the body sensation temperature does not change much. Therefore, with a 30 day old air cooling coefficient of 3.5, a cross-sectional area of 50, a fan wind speed of 0.194m/s, and no less than 4 fans should be activated.
2. Negative pressure: When using a water curtain, the negative pressure generally cannot be higher than 18. Excessive negative pressure can lead to high temperature dead corners. Some people cannot distinguish between the inlet wind speed and the chicken house wind speed. In summary, the intake air speed is determined by the fan exhaust air volume and the intake area, while the chicken house wind speed is determined by the fan exhaust air volume and the chicken house cross-sectional area. Many people believe that when the incoming wind speed increases, the wind speed in the chicken house increases, which is not directly related.
3. A 15cm water curtain should have a wind speed between 1.78m/s and 2.2m/s, which is the most appropriate. If it is too small, the cooling effect is not ideal, and if it is too fast, the evaporation is incomplete, which increases the humidity of the chicken house.
3、 Causes and Solutions of Low Temperature in the Middle of Caged Chicken House
When using a wet curtain to cool down in a cage chicken house, chickens may react and catch cold in the middle of the house, especially in areas within 5-6 meters behind the longitudinal damper of the side wall walkway. When the outdoor temperature rises and the water supply time of the wet curtain water pump increases, the phenomenon that the high temperature difference between the head and tail increases, and the temperature in the middle section is lower than the temperature in the front section will occur.
What is the reason for this phenomenon? How should it be resolved? Through several comparisons of adjustment and control methods, including opening the gable wet curtain first, closing some water ball valves on the side wall wet curtain, closing half of the side wall submersible pump, removing the wind shield near the rear end of the side wall damper, and adjusting the temperature difference between the number of fans and the opening of the water curtain, the root causes of the problem gradually emerged.
There are two main reasons: one is that the longitudinal wind speed suddenly increases in the area behind the longitudinal damper on the side wall, and the other is that the wet curtain on the side wall is too long.
The fan and wet curtain configurations for cage rearing chicken coops are much more than those for grid rearing. In Shandong, a chicken coop with a length of 90m * width of 15.5m * eaves height of 3.4m * ridge height of 5.4m is generally equipped with 20 50-inch shutter fans and a wet curtain of 128.5 ㎡, including a gable wall with a width of 15.5m * height of 2.6m, and a side wall with a width of 21m * height of 2.1m * 2 sides. If the wet curtain submersible pump is initially started for 7-8s, the wet curtain will wet about 20cm, Effective cooling area=(21 * 2+15.5) * 0.2=11.5 ㎡. The cooling area of the initial startup is significantly too large, and the cooling effect accumulated to the position of the longitudinal damper on the side wall will cause the temperature to be close to or lower than the previous temperature. In addition, the wind speed in the side wall walkway at this position is significantly increased, and the sensory temperature of chickens in this area is generally low, even leading to respiratory symptoms caused by cold stress.
