Ammonia evaporation in a mixed configuration chevron plate heat exchanger with and without miscible oil

Tariq S. Khan, Mohammad S. Khan, Ming C. Chyu, Zahid H. Ayub

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

An experimental study was conducted to determine the effects of miscible lubricant oil on evaporation of ammonia in a vertical chevron plate heat exchanger. The heat exchanger was configured in a U-type counter flow arrangement with mixed (30°/60°) chevron plate configuration. Experiments were carried out for four saturation temperatures ranging from -25 °C to -2 °C for a fixed ammonia mass flux rate of 6.5 kg m-2 s-1 and over a range of heat flux levels resulting in a vapor quality at the heat exchanger exit ranging between 0.5 and 0.9. For a given saturation temperature, experiments were performed for 0%, 3%, 6% and 9% oil concentrations, by volume in ammonia. The oil concentration, exit vapor quality, heat flux and saturation temperature were found to have significant effects on the heat transfer coefficient and pressure drop of ammonia. Based on the experimental data, correlations to estimate two phase Nusselt number and friction factor, generalized for the whole range of oil concentration have been presented.

Original languageEnglish
Pages (from-to)120-134
Number of pages15
JournalInternational Journal of Refrigeration
Volume51
DOIs
StatePublished - Mar 2015

Keywords

  • Ammonia
  • Evaporation
  • Heat transfer
  • Miscible oil
  • Plate heat exchanger
  • Pressure drop

Fingerprint Dive into the research topics of 'Ammonia evaporation in a mixed configuration chevron plate heat exchanger with and without miscible oil'. Together they form a unique fingerprint.

  • Cite this