An airside performance of the wavy fin-and-tube heat exchangers having oval tubes

Nae Hyun Kim*, Cheol Hwan Kim, Ho Seung Han

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

In this study, the air-side heat transfer and pressure drop characteristics of the fin-and-tube heat exchangers having an oval tube or a round tube were investigated. Notable things of the samples were that the round and the oval tube had the same perimeter, the fins had the same configuration, and the samples had the same tube pitch. Thus, only the tube shapes were different. The tests were conducted both under dry and wet condition. The thermal performance comparison (ηohoAo/Vo vs. ΔP/L) revealed that a better performance was resulted from the oval tube samples. Under the wet condition, however, the reverse was true. The oval tube samples yielded an inferior thermal performance, probably due to a poor condensate drainage from the oval tube. The pressure drops of the round tube samples were larger than those of the oval tube samples. Furthermore, the pressure drops under wet condition were larger than those under dry condition. The j factor was relatively independent of the fin pitch, whereas the f factor increased as the fin pitch increased. Under wet condition, however, some interesting feature was noticed. The highest j factor was obtained at a two row configuration. A possible explanation was provided considering the condensate drainage behavior.

Original languageEnglish
Article number116807
JournalApplied Thermal Engineering
Volume190
DOIs
Publication statusPublished - 2021 May 25
Externally publishedYes

Keywords

  • Heat exchanger
  • Heat transfer coefficient
  • Oval tube
  • Pressure drop
  • Wavy fin
  • Wet surface

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering

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