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Journal of Enhanced Heat Transfer
IF: 0.562 5-Year IF: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Print: 1065-5131
ISSN Online: 1026-5511

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v1.i4.60
pages 351-364

Convective Vaporization of Pure Refrigerants in Enhanced and Integral-Fin Tube Banks

Neelkanth S. Gupte
Senior Engineer, Carrier Corporation Syracuse, NY
Ralph L. Webb
Department of Mechanical Engineering The Pennsylvania State University, University Park, PA 16802, USA
Specialist in enhanced heat transfer and heat exchanger design

ABSTRACT

Convective vaporization data were obtained on staggered tube banks of enhanced nucleate boiling tubes and integral-fin tubes (IFT) with an equilateral pitch-to-diameter ratio of 1.25. Pure refrigerants R-11, R-123, and R-134a were used as working fluids. The data were taken at 4 and 27 C in an apparatus that allows an independent control of vapor quality, mass velocity, and heat flux. The data span vapor qualities of 0 to 0.9, mass velocities of 10 to 28 kg/m2·s, and heat flux of 15 to 48 kW/m2. The data were predicted using a modified superposition model (using 5=1) and also correlated by an asymptotic model. The nucleate boiling components were obtained from pool boiling data, and single-phase heat transfer coefficients were calculated using appropriate correlations for tube banks. The modified superposition model predicted approximately 80% of the GEWA-SE and Turbo-B data within + 20% but did a poor job predicting the integral-fin tube bank data with R-11 at 4 C. Tube banks made of enhanced nucleate boiling tubes, where boiling performance is governed mainly by subsurface cavities, show insignificant effect of forced convection when compared to plain or integral-fin tube banks.


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