The design process of the air cooler used in refrigerated warehouse is introduced in detail and optimization algorithms are used to optimize the structure of the air cooler of CO2. Volume and the heat transfer coefficient of the heat exchanger are taken as an object function respectively

and fin-pitch

tube distance

tube rows

row numbers

diameter of heat pipe and the lengths of single pipe are selected as decision variables. However

according to the results of optimization

both the two algorithms are defect and insufficient

so the structure of the CO2 air cooler is optimized by the multi-objective optimization with the heat transfer coefficient

volume

air-side pressure drop. It shows that the multi-objective optimization is effective with the weight coefficients. The optimization results are verified by the experiments. Finally

the sensitive analysis of the structure is given based on the optimal result above.