After field observation and testing in summer, in the case of opening all the windows on the two sides and all the two rows of 60 ceiling fans, a vortex is formed under each ceiling fan, the air in the whole house is disorderly flowing, the wind speed is extremely uneven, up and down The difference is more than 1m/s. Originally installed spring-type drinking fountains in the house, the water leakage is serious, the manure water in the manure tank is cross-flowing, the relative humidity in the house is high all the year round, and the house temperature is low in winter. Due to the high water content in chicken manure, it has caused great difficulties for future treatment.
Therefore, according to the above situation, the chicken house is modified as follows: the asbestos plastic plate is used to close the gas building outlet, and the roof thief wind may be blocked. The lower windowless vents are fitted with push-out steel windows for easy control of air intake during mechanical ventilation. All of them are replaced with high-quality nipple drinkers, and the pipe part of the joint is guaranteed to not leak when it is inflated and contracted. The water content of chicken manure is reduced from 95% to about 80%, which not only reduces the relative humidity in the house, but also provides a prerequisite for the implementation of the manure treatment technology.
The basis for the design ventilation of the ventilation test is: in summer, the number of cubic meters per kilogram of body weight per hour required for the maximum temperature of the laying hen, and the minimum amount of ventilation for discharging harmful gases in winter. According to the weight of laying hens 1.352.25kg, when the temperature is higher than 27e, the maximum ventilation is set at 9.35m3/h.kg, and the number of laying hens in a chicken house is 56 groups @2 columns @96ç¾½/group = 10368 hens . The roman hens raised at this site generally weigh 2 kg/feather. The maximum ventilation in summer is: 2kg / feather @ 10368 feathers @ 9.35m3 / h.kg = 193881.6m3 / h.
Ventilation method: The axial air blower is used in the egg house to forcibly discharge the air inside the house, so that the air inside the house is slightly lower than the atmospheric pressure into a negative pressure environment, and the outside air flows in from the other side of the chicken house. Chicken coop. This method has a slower airflow into the house and the chicken feels more comfortable. In the technical indicators of the QCHS-125 fan used in this project, the ventilation capacity is 40500m3/h per unit. Therefore, the fan required for a laying house is: 193881.6m3/hA40500m3/h=4.7872 (set).
Due to airflow organization and fan installation, the actual ventilation should be higher than the theoretical ventilation of 5%, so take 5 units. Open the relationship between the number of fans and the air inlet: Generally, the air intake area of ​​0.096m2 is required for every 1000m3/h of air exchange, and the air inlet of one fan needs (40500A1000)@0.096=3.888m2. Therefore, in the longitudinal ventilation, according to the number of fans opened, the appropriate area of ​​the air inlet is adjusted by opening the doors and windows to achieve a good ventilation effect. In management, different types of fans can be turned on according to different seasons, different temperatures and different wind speeds to achieve better ventilation.
Ventilation test According to relevant data, in the artificial climate chicken house with temperature of 32.7e and relative humidity of 62%, when the wind speed is increased from 1.1m/s to 1.6m/s, the egg production rate of the chicken is 1.3% 1.5%. Therefore, in summer open house, the wind speed is ideal at 1.31.5m/s.
In the summer, the temperature in the temperature drop test is too high. In order to maintain a relatively normal egg production rate, the temperature in the egg house must be kept as close as possible within the proper production range. It is well known that regardless of the ceiling fan or fan ventilation, regardless of the wind speed, the temperature of the house environment cannot be lowered. Under the premise of maintaining the appropriate wind speed with the fan, it is necessary to select a suitable cooling device to reduce the temperature inside the house. Pre-test comparison of different cooling equipment: hollow brick sprinkler water intake method began in 1990, the southern region, especially in Shanghai, mainly used wet curtain cooling method in the chicken house, but the wet curtain maintenance cost is high, the service life is short, and the cost is high. The hollow brick is placed at the position where the honeycomb paper is originally installed, and then the vertical fan is used for negative pressure ventilation, and the tap water pipe is installed above the hollow brick to spray water into a water curtain, so that the air outside the room passes through the water curtain and enters the house.
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