Pool Boiling Heat Transfer Characteristics of HFO-1234yf on Plain and Microporous-Enhanced Surfaces

Author:

Moreno Gilberto1,Narumanchi Sreekant,King Charles2

Affiliation:

1. e-mail:

2. National Renewable Energy Laboratory, Golden, CO 80401

Abstract

This study characterizes the pool boiling performance of HFO-1234yf (hydrofluoroolefin 2,3,3,3-tetrafluoropropene). HFO-1234yf is a new, environmentally friendly refrigerant likely to replace HFC-134a in automotive air-conditioning systems. Pool boiling experiments were conducted at system pressures ranging from 0.7 to 1.7 MPa using horizontally oriented 1-cm2 heated surfaces. Test results for pure (oil-free) HFO-1234yf and HFC-134a were compared. The results showed that the boiling heat transfer coefficients of HFO-1234yf and HFC-134a were nearly identical at lower heat fluxes. HFO-1234yf yielded lower heat transfer coefficients at higher heat fluxes and lower critical heat flux (CHF) values as compared with HFC-134a. To enhance boiling heat transfer, a copper microporous coating was applied to the test surfaces. The coating enhanced both the boiling heat transfer coefficients and CHF for both refrigerants at all tested pressures. Increasing pressure decreased the level of heat transfer coefficient enhancements and increased the level of CHF enhancements. The experimental data were then used to develop a correlation for predicting the CHF for a smooth/plain heated surface.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Reference36 articles.

1. Leck, T. J., 2009, “Evaluation of HFO-1234yf as a Potential Replacement for R-134a in Refrigeration Applications,” Proc. 3rd IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants Boulder, CO.

2. Minor, B. H., and Spatz, M. A., 2008, “Evaluation of HFO-1234yf for Mobile Air Conditioning,” Proc. 2008 SAE World Congress, Detroit, MI.

3. Nucleate Boiling Heat Transfer Coefficients of R1234yf on Plain and Low Fin Surfaces;Int. J. Refrigeration,2010

4. Heat Transfer and Pressure Drop During Condensation of the Low GWP Refrigerant R1234yf;Int. J. Refrigeration,2010

5. Experimental Study on Condensation Heat Transfer in Vertical Minichannels for New Refrigerant R1234ze(E) Versus R134a and R236fa;Exp. Thermal and Fluid Science,2011

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