Winter Environment Analysising on Enclosed Commercial Layer Housing in Beijing

In order to find the environment distribution in enclosed layer housing in winter, some research work was done in Beijing region. Temperature diference between inside and outside could be about 19℃, the CO_２ consistence was about 2 100×10^－６, the NH₃ consistence was no more than 18×10^－６ when the ventilation rate is 1.3m³/h for each layer. The forms and locations of air inlets affect obviously the distribution of inside temperature and harmful air components.