直接供液CO_2冷风机的设计优化

Optimization Design of CO_2 Air Cooler

以肋片间距、管中心距、管排数、每排管数、传热管外径、换热管单管长度等作为决策变量,以换热器体积、传热系数作为目标函数,采用最优化算法对CO2冷风机的结构参数进行了优化,并将两组优化结果进行了比较,对比结果表明这两种优化方法均存在不足。在此基础上采用兼顾换热器体积、传热系数和空气侧阻力的多目标优化函数对CO2冷风机的结构参数进行优化,结果表明:经过加权选取的多目标最优化结果总体上最优。通过实验对优化结果进行了验证,实验结果表明CO2冷风机存在着一个最佳的充注率,在此充注率下具有最高的传热系数。

The design process of the air cooler used in refrigerated warehouse is introduced in detail and optimization algorithmsare 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 lengthsof 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 transfercoefficient, 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 optimalresult above.