Experimental investigation of evaporation heat transfer and pressure drop of ammonia in a 30° chevron plate heat exchanger

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

Research output: Contribution to journalArticle

30 Scopus citations

Abstract

Ammonia, an environment friendly natural refrigerant with attractive thermo-physical properties is a potential replacement of the synthetic refrigerants with high ozone depletion and global warming potentials. Experimental heat transfer and pressure drop data are obtained for two phase evaporation of ammonia in a commercial plate heat exchanger for symmetric 30°/30° chevron plates. The plate heat exchanger was configured in a single pass U-type counter flow arrangement with liquid ammonia evaporating in upward flow direction and glycol/water solution simulating the heat load in counter flow. Experiments were carried out for saturation temperatures ranging from -25 °C to -2 °C. The heat flux was varied between 21 kW m -2 and 44 kW m -2. Experimental results show significant effect of saturation temperature, heat and exit vapor quality on heat transfer coefficient and pressure drop. Two phase Nusselt number and friction factor correlations are proposed.

Original languageEnglish
Pages (from-to)1757-1765
Number of pages9
JournalInternational Journal of Refrigeration
Volume35
Issue number6
DOIs
StatePublished - Sep 2012

Keywords

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

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