Abstract Recently, the authors have published a paper which provided the frost distribution and growth along the airflow direction of finned tube heat exchangers (FTHXs), and demonstrated that some frost was accumulated on the edge of windward fins at a given frosting condition. As a follow-up to the work reported in the previous paper, in the current paper, the effects of frosting conditions on frost distribution and growth characteristics of FTHXs with different fin pitches were experimentally investigated. The results showed that the protruded thickness of frost on the edge of windward fins and the ratio of the frost mass on the edge of windward fins to that on the entire FTHX were both increased with the increases in air temperature (Ta) and relative humidity (RHa), but decreased with an increase in initial air face velocity (va). In addition, the effects of RHa on the mass ratio were more significant than those of Ta and va. Furthermore, the averaged frost density on the edge of windward fins was increased with an increase in RHa; and that on the surfaces of fins and tubes was increased with an increase in va, but decreased with an increase in RHa.

中文翻译：

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结霜条件对翅片管换热器结霜分布及生长影响的试验研究

摘要 最近，作者发表了一篇论文，提供了翅片管换热器（FTHXs）沿气流方向的霜分布和生长情况，并证明了在给定的霜冻条件下，在迎风翅片的边缘会积累一些霜。作为前一篇论文报告工作的后续工作，在本论文中，实验研究了结霜条件对不同翅片间距 FTHX 结霜分布和生长特性的影响。结果表明，迎风翅片边缘的霜突出厚度和迎风翅片边缘的霜量与整个FTHX上的霜量之比均随着气温（Ta）和相对湿度的增加而增加（ RHa)，但随着初始空气面速度 (va) 的增加而降低。此外，RHa对质量比的影响比Ta和va更显着。此外，迎风翅片边缘的平均霜密度随着RHa的增加而增加；翅片和管子表面的 va 增加而增加，但随着 RHa 的增加而减少。