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

Author(s) : KHAN M. S., KHAN T. S., CHYU M. C., et al.

Type of article: Article, IJR article

Summary

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 to -2°C. The heat flux was varied between 21 and 44 kW/m2. 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.

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Pages: 1757-1765

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Details

  • Original title: Experimental investigation of evaporation heat transfer and pressure drop of ammonia in a 30° chevron plate heat exchanger.
  • Record ID : 30004856
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 35 - n. 6
  • Publication date: 2012/09

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