Heat transfer during condensation of refrigerant blends R404A and R410A flowing through horizontal tubes with 0.76 ≤ D ≤ 9.4 mm at nominal Pr = 0.8–0.9 was investigated. Local heat transfer coefficients were measured for the mass flux range 200 < G < 800 kg m−2 s−1 in small quality increments over the entire vapor–liquid region. Heat transfer coefficients increased with quality and mass flux, while the effect of reduced pressure was not very significant within this range of pressures. The heat transfer coefficients increased with a decrease in diameter. Correlations from the literature were not able to predict the condensation heat transfer coefficient for these fluids at these near-critical pressures over the wide range of tube diameters under consideration. A new flow-regime based model for heat transfer in the wavy, annular, and annular/wavy transition regimes, which predicts 91% of the data within ±25%, is proposed.
Heat Transfer During Near-Critical-Pressure Condensation of Refrigerant Blends
New Orleans, LA 70139
Chiller Development Program,
Charlotte, NC 28269
Minneapolis, MN 55420
Industrial and Manufacturing Engineering,
Oregon State University,
Corvallis, OR 97331
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received December 31, 2014; final manuscript received September 5, 2015; published online February 3, 2016. Assoc. Editor: Amitabh Narain.
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Garimella, S., Andresen, U. C., Mitra, B., Jiang, Y., and Fronk, B. M. (February 3, 2016). "Heat Transfer During Near-Critical-Pressure Condensation of Refrigerant Blends." ASME. J. Heat Transfer. May 2016; 138(5): 051503. https://doi.org/10.1115/1.4032294
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