Directing against problems concerning the rate of putting steam air-heater or hot air circulating facility into service is lower than 10%,even being left unused for a long-term,the feasibility of abolishing said facilities has been analysed.

An experiment was conducted to investigate the tobacco leaf curing effect by hot air circulation barn.

Through comparison,the heat loss via wainscot overlapping place and heat brdige is much more than that via heat preservation layer,the fully-welded chamber avoids heat bridge and gas leakage;this article gives the caculating and analyzing mehtod with the quantity of heat,and also puts forword experiential value with key parameters;and develops the design emphasis with hot wind circulation and .