Abstract
Under the two environmental problems of ozone depletion and global warming, study on safe and friendly refrigerant becomes extremely urgent. Under this condition, R32 obtains more favor in refrigerating and air conditioning industry, however, its inflammability limits its widely use. This paper uses experiment to study the diffusion and concentration distribution of R32 when leaking from floor type air conditioner, as well as ventilation effect on concentration variation. The results show that, R32 concentration has an obvious stratification on height direction after leaking from floor type air conditioner. It mainly gathers in area below leak hole and barely spreads upward. In area above 1m, R32 concentration is small and there's no risk of Inflammability. Down-exhaust has better effect on R32's dilution. But it should be noticed that R32 concentration in corner where's away from exhaust outlet is high and it can be risk area.
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