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TECHNICAL PAPERS: Evaporation, Boiling, and Condensation

Measurement of Condensation Heat Transfer Coefficients at Near-Critical Pressures in Refrigerant Blends

[+] Author and Article Information
Yirong Jiang

 United Technologies Research Center, East Hartford, CT 06108

Biswajit Mitra

 Carrier Corporation, Syracuse NY 13221

Srinivas Garimella1

 George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332sgarimella@me.gatech.edu

Ulf C. Andresen

 George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332

1

Corresponding author.

J. Heat Transfer 129(8), 958-965 (Jun 22, 2006) (8 pages) doi:10.1115/1.2401618 History: Received August 04, 2005; Revised June 22, 2006

This paper presents the results of an experimental study on condensation heat transfer of refrigerant blends R404A and R410A flowing through horizontal tubes of 9.4 and 6.2mm inner diameter at nominal pressures of 80% and 90% of the critical pressure. Local heat transfer coefficients were measured for the mass flux range 200<G<800kgm2s 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.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 3

Measured R410A h and uncertainties (9.4mm tube)

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Figure 1

Test loop schematic

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Figure 2

Measured R404A h and uncertainties

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Figure 4

Effect of reduced pressure on h

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Figure 5

Comparison of h for R410A and R404A (9.4mm tube)

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Figure 6

Effect of diameter on h (R410A)

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Figure 7

Comparison of measured h with Dobson and Chato (7), Cavallini (16-17), and Thome (24) model predictions (P=0.8×pcrit, R410A, d=9.4mm)

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