The supply air parameter of pressure pre-cooling directly influence the energy consumption of pre-cooling device. In this paper

an experimental platform for pressure pre-cooling is set up

and tomatoes are chosen as experimental objects. The relationship between the tomato center temperature and the time is obtained under the condition of different supply air parameter. By analyzing the principle of tomato pre-cooling time

the tomato pre-cooling results and energy consumption of the pre-cooling device

the optimization scheme of variable supply air speed and temperature is proposed. It is shown that the supply air speed remains 0.9 m/s while the tomato temperature drops from 27 ℃ to 15 ℃

and remains 0.57 m/s while the tomato temperature drops from 15 ℃ to 5 ℃

the energy consumption of the fan can be reduced by 14.5% ~ 17.7%; The supply air temperature remains 4 ℃ while the tomato temperature drops from 27 ℃ to 10 ℃

and remains 2 ℃ while the tomato temperature drops from 10 ℃ to 5 ℃

the energy consumption of the refrigeration system can be reduced by 5.6%~10.5%.