翅片管式冷凝器仿真研究

Simulation Study on Fin-tube Condenser

翅片管式冷凝器广泛用于风冷式空调机组。本文采用稳态分布参数模型对人字型波纹片冷凝器进行计算机仿真。仿真过程中,通过数学模型计算制冷工质在管内的局部冷凝换热系数,翅片侧的表面换热系数及压降由CCWang的关联式确定。翅片的热效率由CFD计算得出。制冷工质的热物理性质使用隐式三次多项式拟合模型计算。将仿真模拟结果与试验数据比较,发现冷凝器换热量的最大相对误差为9.5%,冷凝器出风温度的最大相对误差为1.71%,过冷度的最大绝对误差为1.28℃。

Fin-tube condensers are widely used in air-cooling air-conditioning units. In this paper, steady state distribution parameter model is applied to carry out computer simulation of herringbone wavy fin condenser. During the process of simulation, local condensation heat transfer coefficients of refrigerant inside tubes are calculated with a mathematical model, and surface heat transfer coefficient and pressure drop of fins side are determined by CC Wang＇s correlation. The thermal efficiency of fins is obtained by CFD. Refrigerant＇s thermal physical characteristics are calculated according to implicit cubic polynomial curve-fitting model. Comparing simulation result with experiment data, the biggest relative error of heat exchange capacity is 9.5 %, and the biggest relative error of out-let air temperature is 1.71%, and the biggest absolute error of subcooled temperature is 1.28 ℃.