Affordable Access

Publisher Website

Condensation heat-transfer and pressure drop characteristics of refrigerant R-290/R-600a–oil mixtures in serpentine small-diameter U-tubes

Authors
Journal
Applied Thermal Engineering
1359-4311
Publisher
Elsevier
Publication Date
Volume
29
Identifiers
DOI: 10.1016/j.applthermaleng.2008.12.014
Keywords
  • R-290 And R-600A
  • Refrigerant–Oil Mixtures
  • Flow Condensation Heat-Transfer
  • Pressure Drop
  • Small-Diameter U-Tubes

Abstract

Abstract Flow condensing experiments for refrigerant R-290, and R-600a mixed with the lubricating oil (EMKARATE RL 32H) in serpentine small-diameter (2.46 mm) U-tubes are reported. The tests were run at the saturation temperature of 40 °C, vapor qualities of 0.41–0.82, mass flux of 300–600 (kg/m 2s) and inlet oil concentrations from 0 to 5 mass% oil. It was found that the condensation heat-transfer coefficients increased as mass flux values, vapor quality and the number of tube bends increased, but it decreased as the oil concentration increased. In addition, the two-phase pressure drops increased with increases in mass flux values, the number of tube bends and the oil concentration.

There are no comments yet on this publication. Be the first to share your thoughts.