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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, 32001 Jhong-Li, Taoyuan, Taiwan
cyyang@ncu.edu.tw

Kun-Chieh Liao

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

1Corresponding author.

ASME doi:10.1115/1.4036694 History: Received October 16, 2016; Revised March 28, 2017

Abstract

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

Copyright (c) 2017 by ASME
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