不同环境温度下蓄冷式冷藏车温度场的模拟研究

Simulation study on temperature field of cold storage refrigerated truck under different ambient temperature

环境温度对蓄冷式冷藏车箱体内部温度场与蓄冷材料释冷过程影响较大。本文以Na Cl水溶液为蓄冷材料,通过Solidworks建立蓄冷式冷藏车的物理模型,利用Gambit对物理模型进行网格划分,并采用Ansys软件对车内温度场和蓄冷材料相变过程进行模拟计算。结果表明:随着环境温度的升高,蓄冷板释冷过程加快,释放潜热时间缩短;车箱温度稳定在较高数值,且时间较短。环境温度为303K时,蓄冷材料完全融化为盐溶液需70.2h,车厢温度稳定在293K,维持时间为73.6h。环境温度与冷板温度温差较大,换热量较大,在计算工况下,热流密度为2.75W/h。

The environment temperature has great effects on internal box temperature field of cold storage refrigerator truck and cooling process of cold storage materials. NaC1 aqueous solution was used as cold storage material in this paper. The physical model of the cold storage refrigerator truck was built under Solidworks and then meshed under Gambit. The internal temperature field and cold storage materials phase change process were simulated by Ansys. The simulation results indicate that, the cooling process of storage plate becomes faster and the time of latent heat discharge becomes shorter with enviroment temperature increase. The temperature of carriages can stabilize in a high temperature and the time is short. When environment temperature is 303K, cold storage material needs 70.2h to be melted into salt solution. Carriage temperature can be kept at 293K for 73.6h. The large temperature difference between environment and cold plate leads to a large heat exchange. The heat flux is 2.75W/h under the simulated condition.