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Experimental heat transfer coefficients during refrigerant vaporisation and condensation inside herringbone-type plate heat exchangers with enhanced surfaces.

Author(s) : LONGO G. A., GASPARELLA A., SARTORI R.

Type of article: Article

Summary

This article presents the experimental work carried out to apply "cross-grooved" surfaces to refrigerant vaporization and condensation inside plate heat exchangers (PHE) with herringbone macro-scale corrugation. It also investigates the effect of an increase in the surface roughness of the plate on refrigerant two-phase heat transfer inside PHE. The enhanced surfaces were experimentally evaluated both in vaporization and condensation tests with refrigerant R22, and compared with a PHE with a smooth surface. The experimental results show that the "cross-grooved" surface is useful both in vaporisation and condensation, whereas the increase in surface roughness is useful only in vaporisation. The "cross-grooved" surface gives an increase in the heat transfer coefficient from 30% to 40% in vaporisation to 60% in condensation with respect to a PHE with a smooth surface. The enhancement in heat transfer coefficient is higher than the simple increase in heat transfer surface area. A fair agreement was found between present experimental data and semi-empirical correlations both for condensation and vaporization inside PHE.

Details

  • Original title: Experimental heat transfer coefficients during refrigerant vaporisation and condensation inside herringbone-type plate heat exchangers with enhanced surfaces.
  • Record ID : 2005-0595
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 47 - n. 19-20
  • Publication date: 2004/09

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