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Research Papers: Evaporation, Boiling, and Condensation

Condensation of R134a and R22 in Shell and Tube Condensers Mounted With High-Density Low-Fin Tubes

[+] Author and Article Information
Wen-Tao Ji

Key Laboratory of Thermo-Fluid Science and
Engineering of MOE,
School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: wentaoji@xjtu.edu.cn

Chuang-Yao Zhao, Wen-Quan Tao

Key Laboratory of Thermo-Fluid Science and
Engineering of MOE,
School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China

Jessica Lofton

Mechanical Engineering,
University of Evansville,
Evansville, IN 47722

Zeng-Yao Li, Ding-Cai Zhang, Ya-Ling He

Key Laboratory of Thermo-Fluid Science
and Engineering of MOE,
School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received May 15, 2017; final manuscript received April 12, 2018; published online May 25, 2018. Assoc. Editor: Amitabh Narain.

J. Heat Transfer 140(9), 091503 (May 25, 2018) (11 pages) Paper No: HT-17-1281; doi: 10.1115/1.4040083 History: Received May 15, 2017; Revised April 12, 2018

In this work, the condensation of refrigerants on a single, high-density, low-fin tube and full-sized shell and tube condensers were investigated experimentally. The low-fin tube had an external fin density of 56 fins per inch (fpi) and fin height 1.023 mm. Another three-dimensional (3D) finned tube was also tested for comparison. The condensing heat transfer coefficient of the refrigerant R134a was first investigated outside a single horizontal tube at saturation temperature of 40 °C. The overall heat transfer coefficients of the two tubes were similar in magnitude. The condensing heat transfer coefficient of the low-fin tube was 16.3–25.2% higher than that of 3D enhanced tube. The experiments of the two condensers mounted with low-fin and 3D enhanced tubes were then conducted in centrifugal and screw chiller test rigs. It was found that chillers with the two different condensers generally had the same refrigeration capacity under the same experiment conditions. The refrigeration capacity of the screw chiller was smaller. It had fewer tube rows and elicited fewer inundation effects owing to the falling condensate. The heat transfer coefficients of the condensers with R134a in centrifugal chillers equipped with high-density low-finned tubes were higher than those in the screw chillers. The total number of tubes for low-fin tube condensers, in the two chillers, was reduced by approximately 15% compared with the use of domestic advanced condensers equipped with the 3D enhanced tubes.

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Figures

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Fig. 3

Comparison of experimental result with Nusselt analytical solution for plain tube

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Fig. 4

Overall heat transfer coefficient versus velocity at heat flux 20 and 30 kW/m2: (a) heat flux=20 kW/m2 and (b) heat flux=30 kW/m2

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Fig. 2

Geometries of enhanced tubes: (a) No. 1 and (b) No. 2

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Fig. 1

Schematic of the experimental apparatus for single tube test: 1—boiler, 2—condenser, 3—thermocouple, 4—pressure gauge, 5—condensate measuring container, 6—exhaust valve, 7—electric heater, 8—weight-time flow meter, 9—water pump, 10—water storage tank, and 11—liquid film distributors

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Fig. 5

Overall heat transfer coefficient versus heat flux for No. 1 and No. 2 at internal water velocity of 2.2 m/s

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Fig. 6

Condensing heat transfer coefficient versus heat flux for single tube

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Fig. 7

Effect of condensate Reynolds number on condensing heat transfer coefficient

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Fig. 8

Moving direction of condensate column outside three-dimensional enhanced tubes

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Fig. 9

Schematic of centrifugal chiller test rig: 1—centrifugal compressor, 2—condenser, 3—evaporator, 4—oil separator, 5—dry filter, 6—sight glass, and 7—expansion valve

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Fig. 10

Average overall heat transfer coefficient of condensers with two enhanced tubes

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Fig. 11

Average condensing heat transfer coefficient of condensers with two enhanced tubes

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