A calculation method and test analysis research of all fresh air ventilation load based on large-scale nursery piggery
In order to solve the problems of high energy consumption,challenging load calculation and cross-infection caused by traditional ventilation environmental control method of piggery,this paper takes nursery pigs as the research object and establishes the load calculation model of all fresh air ventilation.The difference in load calculation results between this model and the traditional time-by-time cold load method is less than 5％,which can be applied to simplify the calculation of engineering.Based on the model,the dynamic regulation method of piggery environmental control parameters,considering different outdoor meteorological conditions,is proposed.Experimental results show that,the average relative error between the measured and theoretical values of the piggery temperature under its regulation strategy is 3.4％,and it meets the requirements of temperature,wind speed control value,and uniformity of the summer piggery.When the regulation method is applied to winter operating conditions,only 150 m3/h air volume per pen is required to meet the air quality requirements in the piggery.Under theoretical air supply parameters,the average air temperature in the piggery is measured to be about 26 ℃,the average daily temperature difference is 5 ℃,and the concentration of pollutants such as CO2,NH3,and PM2.5 are far below the national standard limits.The load calculation model and dynamic regulation method can provide reference for the research of thermal and sanitary environment in large-scale nursery piggery.
all fresh airlarge-scale nursery piggeryhumidity controltemperature distributionpollutants
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