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Condensation of the low GWP refrigerant HFO1234ze(E) inside a brazed plate heat exchanger.

Author(s) : LONGO G. A., ZILIO C., RIGHETTI G., et al.

Type of article: Article, IJR article

Summary

This paper presents heat transfer coefficients and pressure drops measured during condensation of the low GWP refrigerant HFO1234ze(E) inside a BPHE. The condensation temperature ranges between 24.8 and 40.2 °C, the refrigerant mass flux from 10.7 to 39.9 kg m-2 s-1 and the heat flux from 5.3 to 26 kW m-2. The heat transfer coefficients show weak sensitivity to saturation temperature and great sensitivity to refrigerant mass flux and vapour super-heating. At low refrigerant mass fluxes (<20 kg m-2 s-1) the heat transfer coefficients are independent of mass flux and condensation is gravity-dominated. For higher refrigerant mass fluxes (>20 kg m-2 s-1) the heat transfer coefficients depend on mass flux and forced convection condensation occurs. In the forced convection condensation region the heat transfer coefficients show a 32%–35% enhancement for a doubling of the refrigerant mass flux. The condensation heat transfer coefficients of super-heated vapour are from 8% to 11% higher than those of saturated vapour. HFO1234ze(E) exhibits lower (4%–6%) heat transfer coefficients and higher (10%) frictional pressure drops than those of HFC134a.

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Pages: 250-259

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Details

  • Original title: Condensation of the low GWP refrigerant HFO1234ze(E) inside a brazed plate heat exchanger.
  • Record ID : 30010365
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 38
  • Publication date: 2014/02

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