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Research Papers: Evaporation, Boiling, and Condensation

Shell-Side Flow Condensation of R410A on Horizontal Tubes at Low-Mass Fluxes

[+] Author and Article Information
Wei Li

Department of Energy Engineering,
Zhejiang University,
Hangzhou 310027, China
e-mail: weili96@zju.edu.cn

Xu Chen, Jing-Xiang Chen, Zhi-Chuan Sun

Department of Energy Engineering,
Zhejiang University,
Hangzhou 310027, China

Terrence W. Simon

Mechanical Engineering Department,
University of Minnesota,
111 Church Street S.E.,
Minneapolis, MN 55455

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received September 30, 2015; final manuscript received August 28, 2016; published online September 13, 2016. Assoc. Editor: Ali Khounsary.

J. Heat Transfer 139(1), 011501 (Sep 13, 2016) (9 pages) Paper No: HT-15-1629; doi: 10.1115/1.4034552 History: Received September 30, 2015; Revised August 28, 2016

An investigation of refrigerant R410A condensation on a shell and tube heat exchanger simulation is conducted. Tests are on the outside of a horizontal smooth tube, a herringbone tube, and a newly developed three-dimensional-enhanced tube, called the enhanced tube (EHT) tube, all of the same outer diameter. Experiments were conducted at a constant saturation temperature of 45 °C, a constant inlet vapor quality of 0.8, a constant outlet vapor quality of 0.1, and mass fluxes ranging from 5 kg/(m2 s) to 50 kg/(m2 s). At low-mass velocities, the smooth tube shows superior performance over the herringbone tube and the EHT tube. The cause might lie in surface tension effects that result in liquid inundation at the lower portion of the tube, thickening the film on the tube and deteriorating the heat transfer performance. Analyses were conducted to find a suitable correlation of the experimental data.

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Figures

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Fig. 1

Schematic drawing of the test rig

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Fig. 2

Microfin surface geometry: (a) geometric parameters of the microfin surface geometry, (b) basic algebraic dimensions that define the herringbone geometry, and (c) appearance of the herringbone tube

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Fig. 3

EHT tube: (a) inner surface and outer surface enhancement structure, and (b) details of the primary enhancement structure

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Fig. 4

Condensation for the smooth tube: (a) heat transfer coefficient versus mass velocities, and (b) evaluation of improved Nusselt equation

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Fig. 5

Condensation heat transfer coefficient versus mass velocities for the smooth tube and the herringbone tube

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Fig. 6

Evaluation of the correlation for (a) the former mass flux section and (b) the latter mass flux section of the herringbone tube

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Fig. 7

Evaluation of the correlation for the herringbone tube when applied to the EHT tube

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