The present study aims to investigate the effect of working fluid, mass flux, vapour quality and saturation temperature on local condensation Heat Transfer Coefficient (HTC) and local Frictional Pressure Drop (FPD) in a horizontal circular mini-channel. The refrigerants HFO-1234yf and HFC-R134a have been used as a working fluids. The mass flux was varied from 200 to 800 kg/m² s whereas two distinct saturation temperatures were used: 35 °C and 40 °C. The experimental analysis was carried out using horizontal circular single port mini-channel of hydraulic diameter 1 mm. During experiment, inlet condition of refrigerant was maintained to be saturated vapour. The results show that HTC and FPD increases with increase in vapour quality and mass flux whereas decreases with increase in saturation temperature. The experiment results of present study and previously published results are compared with various predictive models. Models which show minimum deviation from experimental results were used to develop new modified model to predict HTC with MARD of ± 15 % and FPD with MARD of ± 10 %.

本研究旨在研究工作流体，质量通量，蒸汽质量和饱和温度对水平圆形微型通道中局部冷凝传热系数（HTC）和局部摩擦压降（FPD）的影响。制冷剂HFO-1234yf和HFC-R134a已用作工作流体。质量通量在200至800 kg / m ^{2之间变化} 而使用两个不同的饱和温度：35°C和40°C。使用水力直径为1 mm的水平圆形单端口微型通道进行实验分析。在实验过程中，制冷剂的入口条件保持在饱和蒸气状态。结果表明，HTC和FPD随蒸气质量和质量通量的增加而增加，而随饱和温度的增加而减少。将本研究的实验结果和先前发表的结果与各种预测模型进行比较。使用显示出与实验结果最小偏差的模型来开发新的修改模型，以预测HTC的MARD为±15％，FPD的MARD为±10％。