Paper Title:
Experimental Study on Condensation of R134a inside Horizontal Inner-Micro-Fin Tubes
  Abstract

An experimental study of condensation heat transfer of R134a on horizontal inner enhanced tubes was conducted. The tested tubes were inner-micro-fin tubes, named tube A and tube B, respectively. The tested pieces were double-pipe condensers. The glycol solution flowed in the space between outer surface of the enhanced tube and inner surface of outer tube. In the experiment, condensing temperature inside the enhanced tube was 51°C, and the flow velocity of glycol solution was 3.35m/s. The inlet temperature of glycol solution changed according to mass velocity of refrigerant, to maintain certain degree of undercooling of outlet refrigerant. The research showed that the condensation heat transfer coefficient of both tubes increased with the increasing mass velocity of refrigerant. when the mass velocity of refrigerant increased from 300kg/m2s to 700kg/m2s, the condensation heat transfer coefficient in tube A was 1.87% to 6.28% higher than that of tube B. However, the flow resistance of the refrigerant in tube B was 9.56% to 11.05% higher than in tube A. The structure of tube A was superior to that of tube B.

  Info
Periodical
Advanced Materials Research (Volumes 354-355)
Chapter
Chapter 5: HVAC, Air Conditioning and Refrigeration
Edited by
Hao Zhang, Yang Fu and Zhong Tang
Pages
753-758
DOI
10.4028/www.scientific.net/AMR.354-355.753
Citation
Q. W. Chen, X. P. Ouyang, "Experimental Study on Condensation of R134a inside Horizontal Inner-Micro-Fin Tubes", Advanced Materials Research, Vols. 354-355, pp. 753-758, 2012
Online since
October 2011
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Price
$32.00
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