ABSTRACT

Three micro-finned and two smooth multiport tubes having the same tube width and height with the microfin tubes were tested using R-410A. For the smooth multiport tube, the tube with smaller hydraulic diameter yielded both higher heat transfer coefficients and larger pressure drops. However, for the microfin tube, results suggested that, fin configuration (number of fins per channel, fin height, etc.) has to be considered in addition to hydraulic diameter. The trend of the pressure drop generally followed the hydraulic diameter – smaller hydraulic diameter tube yielded larger pressure drop. Data are compared with the predictions by existing correlations.

摘要

使用 R-410A 测试了与微翅管具有相同管宽和高度的三个微翅片管和两个光滑多端口管。对于光滑的多端口管，具有较小水力直径的管产生较高的传热系数和较大的压降。然而，对于微翅片管，结果表明，除了水力直径之外，还必须考虑翅片配置（每个通道的翅片数量、翅片高度等）。压降的趋势一般遵循水力直径——较小的水力直径管产生较大的压降。通过现有的相关性将数据与预测进行比较。