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http://dx.doi.org/10.6110/KJACR.2013.25.9.484

Pool Boiling Heat Transfer Coefficient of HFC32/HFC152a on a Plain Surface  

Kang, Dong-Gyu (Graduate School, Inha University)
Lee, Yohan (Graduate School, Inha University)
Jung, Dongsoo (Department of Mechanical Engineering, Inha University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.25, no.9, 2013 , pp. 484-492 More about this Journal
Abstract
Nucleate pool boiling heat transfer coefficients (HTCs) are measured with HFC32/HFC152a mixture at several compositions. All data are taken at the liquid pool temperature of $7^{\circ}C$, on a horizontal plain square surface of $9.53{\times}9.53$ mm, with heat fluxes of 10 $kW/m^2$ to 100 $kW/m^2$ with an interval of 10 $kW/m^2$, in the increasing order of heat flux. Test results show that the HTCs of these mixtures are up to 45% lower than those of the ideal HTCs calculated by a linear mixing rule with pure fluids' HTCs, due to the mass transfer resistance associated with non-azeotropic refrigerant mixtures. Pool boiling data show the deduction in HTCs with an increase in GTD of the mixture. The present mixture data agree well with five well known correlations, within 20% deviation.
Keywords
Nucleate boiling heat transfer coefficient; Alternative refrigerant; Binary mixtures; Evaporator; Heat transfer deterioration;
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