In-tube condensation data of R404A, R448A, and R452A 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 R404, R448A and R452A. The experiments were conducted in a horizontal circular copper tube of 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 each refrigerant are reported at varying mass fluxes (100 to 800 kg m^(-2) s^(-1)) and saturation temperatures of 40, 50 and 60 degrees Celsius. <br>The test section was divided into 7 segments. Exact length of each section is recorded below and 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. <br>Summaries of the average measured values and the calculated variables are presented in the remaining sheets of this document. For more details regarding the experiments, results, and conclusions, please see cited references.

本附件所附数据集采集自俄勒冈州立大学热能系统与输运（TEST）实验室，为针对制冷剂R404、R448A及R452A开展流动冷凝实验期间采集的实验数据。
实验采用内径4.7mm的水平圆形铜管作为实验段，环隙中流动的水作为冷却介质。本数据集给出了各制冷剂在不同质量通量（100~800 kg·m⁻²·s⁻¹）及40℃、50℃、60℃饱和温度下的局部冷凝换热系数与对应热力学干度。

实验段被划分为7个分段，各分段的精确长度已在下方记录，附件附图展示了单个分段的可视化示意图。每个分段均测量冷却水的进出口温度与铜管壁面温度，壁面温度通过安装于各分段中心位置的自粘式表面热电偶采集。基于上述实测数据，可对每个分段的局部换热系数与热力学干度进行计算，该计算过程通过对冷却侧开展能量衡算以确定各分段的传热量完成。

本文件剩余工作表中整理给出了平均测量值与计算变量的汇总结果。如需了解实验设计、结果分析与结论推导的更多细节，请参阅引用文献。