Condensation heat transfer of R1234yf inside smooth and microfin tube with 2.5 mm outer diameter are studied experimentally. The experiments are carried out at a saturation temperature of 20°C and 30°C, mass velocity ranging from 50 to 200 kg m⁻²s⁻¹ and vapor quality ranging from 0-1. The effects of mass velocity, vapor quality, and saturation temperature on condensation heat transfer coefficient are analyzed with R1234yf and R134a. Condensation heat transfer correlation for smooth tube is developed considering present experimental data and other researchers’ data. Correlation is developed using experimental data for 2.5 mm to 10 mm outer diameter tubes and refrigerants are R134a, R1234yf, R123 and R1234ze (E) by including other researchers’ data. Newly developed correlation is successfully predicted experimental data and other sources data within mean deviation of 15 %. Experimental data are also compared with previous correlations proposed for smooth and microfin tube.

实验研究了R1234yf在光滑且外径为2.5 mm的微翅片管内的冷凝传热。实验在20°C和30°C的饱和温度下进行，质量速度范围为50至200 kg m ^-2 s ^-1蒸气质量为0-1。用R1234yf和R134a分析了质量速度，蒸汽质量和饱和温度对冷凝传热系数的影响。考虑到目前的实验数据和其他研究人员的数据，得出了光滑管的冷凝传热相关性。相关性是使用2.5毫米至10毫米外径管的实验数据开发的，制冷剂为R134a，R1234yf，R123和R1234ze（E），其中包括其他研究人员的数据。新开发的相关性是成功预测的实验数据和其他来源数据，平均偏差在15％以内。实验数据也与先前提出的用于光滑管和微翅片管的相关性进行了比较。