The pressure-difference caused by heat and wind are the main factors affecting mass and heat transfer of single spiral quick-freezing installation. At the experimental condition

the cooling loss caused by heat pressure-difference and wind pressure-difference was 3.90kW and 1.48kW respectively

which was larger than the heat load of fender structure (1kW). The results show that heat pressure-difference and wind pressure-difference exist simultaneously and superpose each other. Installing a baffle plate between the entrance and exit can decrease heat pressure-difference. It can reduce wind pressure-difference to make the entrance and exit face paralleling the position of dynamic pressure. The converse interaction of heat pressure and wind pressure is used to modify mass and heat transfer of the entrance and exit and cooling losses. The compared results show that the cooling loss is directly proportional to velocity. When the velocity is reduced 1/3 than the original

the cooling loss is reduced the same ratio.