The extreme maximum temperature in Beijing during the summer is 41.9°C. When the environment is in high temperature and high humidity, the heat balance of the pig body is destroyed and the body temperature rises. The pigs become unconscious and the phenomenon of heat death occurs severely. In Beijing, without any cooling measures, the annual average number of hours of this dangerous state is about 50 hours. In order to reduce the influence of high temperature in summer on the reproductive performance of pigs, it is necessary to take suitable cooling measures for breeding pigs.
The higher the temperature and the lower the humidity, the more obvious the cooling effect is. At temperatures higher than 30°C and relative humidity less than 70%, the entire evaporative cooling technology can usually achieve a cooling effect of 2°C-3°C or even higher. The statistics of years of meteorological data in Beijing shows that the number of hours for temperature ≥30°C is nearly 600 hours. In weather conditions above 30°C, the proportion of hours with humidity ≤70% is 93%, ie, higher than 30°C. Under the circumstances, 93% of the time can effectively use the entire evaporation cooling technology.
The wet curtain-fan cooling system is a cooling technology that combines a wet curtain evaporation device with negative pressure mechanical ventilation, and is generally used for window closed pig houses. The system is mainly composed of fans, wet curtains, water pumps, circulating pools, and automatic controllers. Wet curtain-fan cooling system fan configuration in accordance with the requirements of the ventilation configuration, there are two ways to configure the ventilation rate: one is based on the number of pigs ventilation, the number of summer ventilation is 1 / min or 1 /2 minutes. The Other is based on the number of pigs and the amount of ventilation required for each pig in the summer. The ventilation requirement for summer pigs is 0.6 cubic meters per hour and kilograms for overcast curtains. The average screen speed is 1-2 meters per second. = Ventilation volume / wind speed. The distance between the wet curtain and the fan should not exceed 50 meters.
Inconvenient installation of the wet curtain-fan cooling system in the window-type or semi-open type pig house, the wet curtain-cooling fan cooling system can be adopted, that is, the positive pressure is used to send the cold air and the wet curtain in combination, and the cooling device is also known as Environmental air conditioning. Each device invests 2600 yuan to 6,000 yuan, each device air volume is 18000 cubic meters / hour, can be used within the area of ​​100 square meters of cooling, the wind out of the form of the upper and lower wind and side of the wind out points Depending on the construction of the existing pig house and the feasibility of installation, the choice can be made.
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