Research Papers: Micro/Nanoscale Heat Transfer

Effect of Experimental Method on the Heat Transfer Performance of Supercritical Carbon Dioxide in Microchannel

[+] Author and Article Information
Chien-Yuh Yang

Department of Mechanical Engineering,
Institute of Energy Engineering,
National Central University,
Jhong-Li, Taoyuan 32001, Taiwan
e-mail: cyyang@ncu.edu.tw

Kun-Chieh Liao

Department of Mechanical Engineering,
Institute of Energy Engineering,
National Central University,
Jhong-Li, Taoyuan 32001, Taiwan
e-mail: kunchiehliao5865@gmail.com

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received October 16, 2016; final manuscript received March 28, 2017; published online June 21, 2017. Assoc. Editor: Joel L. Plawsky.

J. Heat Transfer 139(11), 112404 (Jun 21, 2017) (7 pages) Paper No: HT-16-1670; doi: 10.1115/1.4036694 History: Received October 16, 2016; Revised March 28, 2017

This paper provides an experimental investigation of heat transfer and pressure drop of supercritical carbon dioxide cooling in a microchannel heat exchanger. An extruded flat aluminum tube with 37 parallel channels and each channel of 0.5 mm × 0.5 mm cross section was used as the test section. The temperature drops of supercritical CO2 cooled inside the test section were controlled at 2 °C, 4 °C, and 8 °C separately for each test to investigate the effect of property change on the friction and heat transfer performance at various temperature cooling ranges near the critical point. The test results showed that while the test conditions were away from the critical point, both heat transfer and pressure drop performance agreed very well with those predicted by conventional correlations. However, for the test conditions near the critical point, the difference between those of the test results and the predicted values is very high. Both heat transfer and pressure drop were strongly affected by the ranges of temperature cooling in the test section while they were near the critical conditions. Since there is a drastic peak of the property change near the critical point, if we use the properties integrated but not averaged from inlet to the exit temperatures, we obtain the results that agree well with the values predicted by conventional correlations. The heat transfer and pressure drop performance of supercritical carbon dioxide in microchannels with size near 0.5 mm are indeed similar to these at normal conditions if its properties are appropriately evaluated.

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Fig. 1

GWP and ODP of various refrigerants

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Fig. 2

Dimensions of the test tube and test section: (a) test tube with enhanced surface, (b) cross section of test tube, and (c) cross section of test section with water jacket

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Fig. 3

Assembly of the test section

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Fig. 4

Schematic diagram of the experimental system

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Fig. 5

Schematic T–s diagram of the test process

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Fig. 6

Comparison of measured and predicted pressure drop

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Fig. 7

Heat transfer coefficients at various mass velocities

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Fig. 8

Comparison of the experiment results with the prediction values by conventional correlations

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Fig. 9

Comparison of predicting results by using different temperature intervals

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Fig. 10

Comparison of the present test results to other prediction results

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Fig. 11

Heat transfer coefficients at various temperature changes in the test section

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Fig. 12

Comparison of the present test results to the predicted values by Kuang [5]




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