摘要
针对二流程平行流式冷凝器,通过计算流体力学(CFD)仿真分析,得出进口压板在不同位置时冷凝器内部阻力以及流量分布均匀性的趋势。通过R134a焓差性能试验台,利用红外热成像仪记录冷凝器表面的温度分布情况,对3种不同进口压板位置的冷凝器进行不同风速下的制冷性能试验。结果表明:当进口压板位于第一流程60%左右位置时,冷凝器换热性能最好,制冷剂阻力最小,流量分布最均匀。当进口压板位于第一流程最底端时,换热性能最差,制冷剂阻力最大。在不同风速下,最差位置与最佳位置相比,最差位置换热性能低3%左右,制冷剂阻力高41%~48%。以上试验数据的对比分析,为指导平行流式冷凝器的详细结构设计提供了参考。
According to the CFD analysis of the two-pass parallel flow condenser,the trend of refrigerant side pressure-drop and flow distribution uniformity in the condenser when the inlet block-fitting is at different positions is obtained.Based on this,the refrigeration performance experiments were carried out at different air speeds for the condensers with three different inlet block-fitting positions on performance test bench with R134a by enthalpy difference method,and recorded the temperature distribution on the condenser surface with an infrared camera.The results show that when the inlet block-fitting is located at about 60% of the first pass,the condenser has the highest heat transfer performance,the lowest refrigerant pressure drop and the most uniform flow distribution.When the inlet blockfitting is located at the bottom of the first pass,the heat transfer performance is the lowest and the refrigerant pressure drop is the highest.At different air speeds,the heat transfer performance of the worst position is about 3%lower than that of the best position,and the refrigerant pressure drop is about 41%~48% higher.Through the comparison and analysis of the above test data,the optimization direction is provided for guiding the detailed structure design of the parallel flow condenser.
作者
侯海焱
吴兆亮
HOU Haiyan;WU Zhaoliang(Shanghai SDAAC Automotive Air-Conditioning Systems Co.,Ltd.,Shanghai 201204,China)
出处
《现代车用动力》
2023年第1期12-16,25,共6页
Modern Vehicle Power
关键词
平行流式冷凝器
进口压板位置
制冷性能
流量分布均匀性
parallel flow condenser
inlet block-fitting positions
refrigeration performance
uniformity of flow distribution
