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.
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November 2013
This article was originally published in
Journal of Heat Transfer
Research-Article
Pool Boiling Heat Transfer Characteristics of HFO-1234yf on Plain and Microporous-Enhanced Surfaces
Gilberto Moreno,
Charles King
Charles King
National Renewable Energy Laboratory
,Golden, CO 80401
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Gilberto Moreno
e-mail: gilbert.moreno@nrel.gov
Charles King
National Renewable Energy Laboratory
,Golden, CO 80401
Contributed by the Heat Transfer Division of ASME for publication in the Journal of Heat Transfer. Manuscript received June 29, 2012; final manuscript received January 18, 2013; published online September 23, 2013. Assoc. Editor: Sujoy Kumar Saha.
J. Heat Transfer. Nov 2013, 135(11): 111014 (10 pages)
Published Online: September 23, 2013
Article history
Received:
June 29, 2012
Revision Received:
January 18, 2013
Citation
Moreno, G., Narumanchi, S., and King, C. (September 23, 2013). "Pool Boiling Heat Transfer Characteristics of HFO-1234yf on Plain and Microporous-Enhanced Surfaces." ASME. J. Heat Transfer. November 2013; 135(11): 111014. https://doi.org/10.1115/1.4024622
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