In-tube condensation data of R134a and R450A in a horizontal 4.7 mm ID tube

The attached data was collected at Oregon State University in the Thermal Energy Systems and Transport (TEST) Laboratory during flow condensation experiments for refrigerants R134a and R450A. The experiments were conducted in a horizontal circular copper tube with 4.7mm internal diameter. Water, flowing in the annulus, was used as the coolant. The local condensation heat transfer coefficients and the associated qualities for R-134 and R450A are presented at varying mass fluxes (100-2 s-1) and two different saturation conditions (T_dew ≈ 45 and 55oC) The test section was divided into 7 segments. Exact length of each section is recorded in the attached file, and an attached figure shows visual representation of a segment. Water inlet and outlet temperature and the copper tube surface temperature are measured in each segment. The surface temperatures were measured at the center of each section using self-adhesive surface thermocouples. Using these measurements, local heat transfer coefficients and thermodynamic qualities were evaluated for each segment. This was accomplished by performing energy balances on the coolant side to determine the heat duties transferred in each section. Summaries of the average measured values and the calculated variables are presented in the attached document. For more details regarding the experiments, results, and conclusions, please see cited references.

本附件数据集采集自俄勒冈州立大学热能系统与输运（TEST）实验室，为制冷剂R134a与R450A流动冷凝实验的相关数据。实验在内径4.7mm的水平圆形铜管内开展，环隙中流动的水作为冷却剂。本数据集提供了R-134与R450A的局部冷凝换热系数及其对应干度，测试工况涵盖不同质量通量（100~2 s⁻¹）与两种饱和条件（露点温度T_dew≈45℃及55℃）。试验段被划分为7个分段，各分段的精确长度记录于附件文件中，附带附图展示了单个分段的可视化结构。每个分段中均测量了冷却水的进出口温度与铜管表面温度，其中表面温度通过粘贴式表面热电偶在各分段的中心位置测得。基于上述测量数据，可计算得到每个分段的局部换热系数与热力学干度，该计算通过对冷却剂侧开展能量衡算以确定各分段传递的热负荷得以实现。附件文档中给出了平均测量值与计算变量的汇总结果。如需了解实验、结果与结论的更多细节，请参阅引用文献。