HFO1234ze(Z) saturated vapour condensation inside a brazed plate heat exchanger.

Number: pap. 2208

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


This paper presents the experimental heat transfer coefficients and pressure drop measured during HFO1234ze(Z) saturated vapour condensation inside a small commercial BPHE: the effects of refrigerant mass flux and saturation temperature were investigated. The heat transfer coefficients show weak sensitivity to saturation temperature and great sensitivity to refrigerant mass flux. At low refrigerant mass flux (< 15 kgm-2s-1) the heat transfer coefficients are independent of mass flux and condensation is controlled by gravity. For higher refrigerant mass flux (> 15 kg m-2s-1) the heat transfer coefficients depend on mass flux and forced convection condensation occurs. The frictional pressure drop shows a linear dependence on the kinetic energy per unit volume of the refrigerant flow and therefore a quadratic dependence on the refrigerant mass flux. HFO1234ze(Z) shows heat transfer coefficients and frictional pressure drop higher than HFC236fa. The experimental results were compared against theoretical models for condensation heat transfer coefficients (Nusselt, 1916 and Akers et al., 1959) and a new linear correlation for two-phase frictional pressure drop was presented.

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  • Original title: HFO1234ze(Z) saturated vapour condensation inside a brazed plate heat exchanger.
  • Record ID : 30013061
  • Languages: English
  • Source: 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2014/07/14


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