Experimental investigation of condensation heat transfer of refrigerant R-134A in helicoidal pipes Conference

Han, JT, Lin, CX, Ebadian, MA. (2000). Experimental investigation of condensation heat transfer of refrigerant R-134A in helicoidal pipes . 2000-V 95-101. 10.1115/IMECE2000-1510

cited authors

  • Han, JT; Lin, CX; Ebadian, MA

authors

abstract

  • Alternative refrigerant R-134a is considered to be ozone-friendly and a potential candidate for replacing the refrigerant CFC-12 in refrigeration and air-conditioning applications. This paper presents the experimental investigation of condensation heat transfer characteristics of superheated R-134a vapor flowing inside helicoidal pipes with the cooling water flowing through the annular helicoidal passage in a counter-flow direction. The heat transfer experiment was performed for R-134a mass flow flux ranging from 100 to 420 kg/m2s with the superheat of die inlet vapor of 2.8°C and 8.3°C, respectively. The cooling water flow Reynolds Rew ranges from 1500 to 12000. The Nusselt numbers were experimentally determined for a helicoidal pipe with the helix axis of vertical direction. The correlations for Nusselt numbers are developed based on the experimental results, which can be used as a reference in the design of helicoidal pipe condensers.

publication date

  • January 1, 2000

Digital Object Identifier (DOI)

start page

  • 95

end page

  • 101

volume

  • 2000-V