关键词: 仔猪舍, 自然通风, CO2, 数值模拟

Abstract: At present, most of the swine farms adopt reduce ventilation in winter to keep warm. In order to evalute the indoor air quality under this feeding model, this paper took weaned piglet house with natural ventilation as research object, and adopted CFD technology to run numerical simutation on air velocity, temperature, CO2 concentration in natural ventilated piglet house and on the basis of environment factor spot measurement. The simulation results showed that within piglets activity area, where the breathing level height was 0.4 m and wind speed was under 0.1 m/s. There was a large airflow stagnation area in the second half of the house, mainly due to the insufficient air ventilation, the fresh air was unable to penetrate the entire pig house. The temperature distribution range was 15~21℃, the average temperature round air inlet end was around 16℃; the average temperature inside the house was 20℃, average CO2 concentration was 0.16%~0.25%, with an average concentration of 0.19%. At 6 environmental measurement points, the relative error of airflow field ranged from 0.2%~30%. The temperature field error was 2%~13%. The relative error range of CO2 concentration was 4.3%~24.2%. The relative error range between measured value and simulation value was within the acceptable limits. The temperature and CO2 concentration in the shed were not within the environmental hygiene standards. The natural ventilation model could not meet the demands of weaned piglets for winter environment. The above results laid a foundation for effectively improving the feeding and management level, and realizing the maximization of economic benefits.

Key words: piglet shed, natural ventilation, CO2, numerical simulation