Simulation and optimization of hot and humid environment in winter house-type cowshed based on CFD
In order to study the distribution law of wind speed,temperature and relative humidity field of the house-type cowshed in the cold region of north China,the computational fluid dynamics(CFD)method is used to simulate the wind speed,temperature and relative humidity of a house-type cowshed in Chengde,Hebei Province in winter.The simulation results show that under the natural ventilation mode,the wind speed in the passageway is 0.5-1.60 m/s,the wind speed in the cattle movement area is basically between 0-0.4 m/s,and the wind speed in most areas is below 0.1 m/s,and the air distribution in the cowshed is not uniform.The average temperature in the cowshed is about 10.7℃,and the relative humidity in the cattle movement area is basically kept 50%-60%.Under the condition that the existing structure of the cowshed remains unchanged,the position and number of the ventilation vents in the cowshed are improved.After the optimization of the ventilation scheme,the wind speed in the cattle barn is 0.1-0.6 m/s,and there is basically no dead angle of ventilation.The normalized mean square error(NMSE)values of the measured and simulated values are both less than 0.25,indicating that the field measurement has a good agreement with the numerical simulation.This study can provide useful reference for environmental assessment and ventilation scheme optimization of house-type cowsheds in cold regions of northern China.
CFDhouse-type cowshedhot and humid environmentnumerical simulationventilation optimization
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NSTL
万方数据
