In the hot summer, the most cooling measures used in the farm are the use of water curtain, the specific principle is: hot air due to negative pressure, through the water curtain into the chicken house, when the wind passes through the water curtain, it will take away the water on the water curtain, so that it becomes water vapor, thereby absorbing a lot of heat, so that the air temperature through the water curtain is greatly reduced. In particular, it should be noted that the water curtain does not cool the air by circulating cold water from above, but uses the water to turn into water vapor and absorb a large amount of heat to cool down.
Research data show that if the temperature of 1kg of water is increased by one degree, the heat absorbed is 1 kcal; However, the heat absorbed to let 1 kg of water approximately 20 degrees Celsius become water vapor is 619 kcal. It can be seen that the cooling effect of the water curtain is not the temperature of the circulating water, but whether there is enough water curtain area and wind speed. In addition, the air humidity is too high, so that the water is not easy to evaporate, and the cooling effect of the water curtain will be greatly reduced. About how many square meters of water curtain corresponds to how many exhaust fans, how much air volume, how much wind speed, these are not repeated here, this article is only here to analyze the installation position of the water curtain in the chicken coop and its advantages and disadvantages.
In the first mode, the water curtain is installed at one end of the coop and the exhaust fan is installed at the other end of the coop. This is one of the most common ways to install.
The disadvantages of this mode are: the temperature is uneven, the air inlet is cool, and the end is hot. As a result, the chickens at the air inlet are exposed to damp, cold, and forced wind speed for a long time, which is extremely uncomfortable and prone to respiratory diseases. Moreover, because it is in the limelight in the chicken coop, once the chicken at the air inlet gets sick, it quickly spreads to the whole flock. This model has now proven to be a major drawback in raising chickens, and the underlying disease is the respiratory tract. The only solution is to add a guide plate behind the water curtain, so that the wind blows as much as possible and does not blow directly to the chicken coop, but in general, the air inlet of the chicken coop is a section, about the first third part, the air humidity is high, the temperature is low, the wind speed is large, and the chicken weight is small. The author has compared the breeders, the 66-meter chicken coop and the 120-meter chicken coop, the difference in production performance is about 5%, and the 66-meter chicken coop is significantly better than the 120-meter chicken coop, because the 66-meter chicken coop, the air inlet wind speed is relatively small, and the chicken coop is slightly stuffy. And the 120-meter chicken coop, in order to ensure the cooling effect, the wind speed is very fast, especially the air inlet, people stay for a long time, it is uncomfortable, not to mention the chicken.
In the second mode, the water curtain is installed at about 40 meters in the 100-meter coop, and then the exhaust fan is installed at the end. At the same time, the front end of the chicken coop also has an air inlet. If the fan is turned on, through the negative pressure, the front end of the chicken coop is directly hot air in, because it is at the upper end of the air inlet, the air is fresh, although the air is hot, but there is a certain wind speed, the chicken is very comfortable. Assuming that the air inlet temperature is 35 °C, and the wind speed of 2 m/s enters, the temperature of the chicken is equivalent to 29 degrees. At 40 meters, the cold air from the outside through the water curtain mixes with the hot air, so that the air temperature does not drop very low at the 40 meters position. At this time, the 35 degrees of air entering the air inlet, due to the heat production of the chicken house, reaches 38 degrees, but the air temperature of the water curtain is 28 degrees, the two are mixed, and the air temperature is still about 33 degrees, and the wind speed of 2 meters is continued to be maintained, and the body temperature of the chicken is equivalent to 27 degrees, which is not much different.
Then to the end of the chicken house, the air will be heated to about 35 degrees, so the overall temperature in the chicken house is very uniform, especially at the front end of the chicken house, the wind speed of the air inlet is very large, but because it is hot air, it will not cause the chicken to catch a cold, and although the cool air enters in the middle, the wind can be blown upwards through the wind deflector, and then mixed with the hot air coming in from the head of the chicken house, and then blown to the chicken, it will not cause a cold.