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Flow pattern map, heat transfer and pressure drops during evaporation of R1234ze(E) and R134a in a horizontal, circular smooth tube: experiments and assessment of predictive methods.

Author(s) : GRAUSO S., MASTRULLO R., MAURO A. W., et al.

Type of article: Article, IJR article

Summary

This paper presents experimental results for local heat transfer coefficients, adiabatic frictional pressure gradients and two-phase flow regimes with the low-GWP refrigerant R1234ze(E), compared to HFC refrigerant R134a in the same conditions. In particular the results refer to an experimental investigation carried out in a circular smooth tube of 6.00 mm of inner diameter, for saturation temperatures between -2.9 and 12.1°C, mass fluxes between 146 and 520 kg/m2.s and heat fluxes between 5.0 and 20.4 kW/m2. These experimental results are compared to those for R134a at the same operating conditions. Moreover, an assessment of predictive methods is provided for local heat transfer coefficients and frictional pressure gradients; also a direct comparison of flow regimes visualizations for R1234ze(E) with a flow pattern map available in literature is presented.

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Pages: 478-491

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Details

  • Original title: Flow pattern map, heat transfer and pressure drops during evaporation of R1234ze(E) and R134a in a horizontal, circular smooth tube: experiments and assessment of predictive methods.
  • Record ID : 30007161
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 36 - n. 2
  • Publication date: 2013/03

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