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Two-phase flow heat transfer of a new low GWP developmental refrigerant in smooth tube evaporator.

Number: pap. n. TP-060

Author(s) : WU X., CREMASCHI L.

Summary

Refrigerants HFCs and new blends that have zero ozone depletion potential, are adopted in air conditioning and heat pump systems but they have global warming potential (GWP) that might be of concern from an environmental perspective in case of leakage or in case of improper charge management. Research and developmental work is ongoing to define the thermal physical, heat transfer, and transport properties of new synthetic fluids that have low GWP and that are able to function as drop-in replacement for R410A. This paper introduces new experimental data of two-phase flow heat transfer and frictional pressure drops during flow boiling of a new developmental refrigerant, referred to as DR-5, which is a near-azeotropic mixture of R32 and R1234yf in concentration of 72.5 and 27.5 by weight (Schultz & Kujak, 2012). It has GWP of 500, is compatible with POE lubricant, and has flammability characteristics of class 2L refrigerants. Measurements were performed for flow boiling in a smooth horizontal cooper tube with 12.7 mm (0.5 in) diameter. The results were compared with data from R410A and R32 in the same geometry and similar mass flux and saturation temperatures. The heat transfer coefficients of DR-5 showed similar characteristics as that of R32 but they were slightly lower. It was observed that the effect of mass flux was significant at vapor qualities lower than about 0.7 and an increase of the heat flux significantly increased the local heat transfer coefficient of DR-5. DR-5 had frictional pressure gradients in two-phase flow that were also similar to that of R32.

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Pages: 8 p.

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Details

  • Original title: Two-phase flow heat transfer of a new low GWP developmental refrigerant in smooth tube evaporator.
  • Record ID : 30008285
  • Languages: English
  • Source: 4th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Publication date: 2013/06/17

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