R134a制冷剂在微通道中的相变传热特性实验  

Experiment of condensation and heat transfer for R134a refrigerant in micro-channel heat exchanger

作　　者：王勋[1] 王文[1] 耑锐[1] 

机构地区：[1]上海交通大学制冷与低温工程研究所,上海200240

出　　处：《低温工程》2009年第2期10-14,共5页Cryogenics

基　　金：国家自然科学基金(批准号:50576054)资助

摘　　要：设计了一个可控制制冷剂流量、压力和温度等实验工况的微通道换热器相变流动与换热的可视化实验平台,对R134a制冷剂流经微通道换热器进行了冷凝换热实验研究。试验测量了小质量流率下的R134a制冷剂在多个饱和状态工况下的冷凝换热性能,涉及质量流量、进出口压力和温度等参数。实验分析了传热系数与雷诺数的关系,与Koyama的关联式预测比较接近。分析了摩擦系数随雷诺数的变化,与HL Mo和Wu&Little方程计算得到的数值相近。An experimental setup, which could control the experiment parameters as flow rate, pressure, temperature of the refrigerant, was designed and built to investigate the condensation heat transfer and flow for R134a refrigerant through a micro-channel heat exchanger. The experiment was conducted at some saturation mode working conditions to verify condensation heat transfer capability of R134a in low flow rate, some parameters such as flow rate, inlet＆outlet pressure and temperature were got. The relation between heat transfer coefficient and Reynolds number was analyzed and the experiment data were compared with the Koyama correlation. The change of friction coefficient with Reynolds number was also analyzed and compared with H L Mo and Wu＆Little correlation equations.

关 键 词：R134A制冷剂 微通道 冷凝换热 摩擦系数 

分 类 号：TB612[一般工业技术—制冷工程]