Experimental correlation of pool boiling heat transfer for HFC134a on enhanced tubes: Turbo-E

Seung Woo Yang, Jinhee Jeong, Yong Tae Kang

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The objectives of this paper are to study the heat transfer characteristics for enhanced surface tubes in the pool boiling and to provide a guideline for the design conditions for the evaporator using HFC134a. The shape of tube surfaces, the wall superheat, and the saturation temperature are considered as the key parameters. Copper tubes (d o = 19.05 mm) are treated with different helix angles and the saturation temperatures are controlled from 3 to 16 °C. It is found that the pool boiling heat transfer coefficient decreases with increasing the wall superheat. It is also found that boiling heat transfer coefficients for Turbo-II and Turbo-III are 1.5-3.0 times and 1.2-2.0 times higher than that for Turbo-I without the helix angle, respectively. The higher heat transfer performance from Turbo-II and Turbo-III can be explained by the "bubble detention" phenomenon on the surface without the helix angle for the Turbo-I. The experimental correlations for the pool boiling heat transfer on the present enhanced tubes without (Type I) and with the helix angle (Type II and Type III) are developed with the error bands of ±30%, respectively.

Original languageEnglish
Pages (from-to)130-137
Number of pages8
JournalInternational Journal of Refrigeration
Volume31
Issue number1
DOIs
Publication statusPublished - 2008 Jan 1
Externally publishedYes

Keywords

  • Correlation
  • Enhanced surface
  • Evaporator
  • Experiment
  • Heat transfer coefficient
  • Pool boiling
  • R134a-tube
  • Refrigeration system

ASJC Scopus subject areas

  • Food Science
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Experimental correlation of pool boiling heat transfer for HFC134a on enhanced tubes: Turbo-E'. Together they form a unique fingerprint.

  • Cite this