Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 93, Issue -, Pages 379-387Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2015.10.017
Keywords
Supercritical carbon dioxide; Heat transfer; Double pipe heat exchanger; Correlation; Buoyancy force
Categories
Funding
- NSFC of China [51120165002]
- National Natural Science Foundation of China [51306139]
- China Postdoctoral Science Foundation [2014T70919]
- Central Universities of China
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Supercritical carbon dioxide (SCO2) is a promising working fluid for the cryogenic refrigeration, air-condition and heat pump systems. The present study sets up a SCO2-water test loop to study the heat transfer performance of SCO2 in a double pipe heat exchanger. The effects of SCO2-side pressure, mass flux and buoyancy force as well as water-side mass flux are investigated. It is found that the total and SCO2-side heat transfer coefficients reduce as the SCO2-side pressure increases. The peak total and SCO2-side heat transfer coefficients appear at a higher temperature than the pseudo critical temperature. The water-side mass flux has a larger effect on the total heat transfer coefficient compared to the SCO2-side mass flux in the studied cases. The contribution of buoyancy force to the heat transfer performance is large at the small SCO2-side mass flux and it becomes smaller as the SCO2-side mass flux increases. The SCO2-side pressure and water-side mass flux have little effect on the buoyancy force. A heat transfer correlation that includes the effect of buoyancy force is obtained by fitting the experimental data with genetic algorithm. (C) 2015 Elsevier Ltd. All rights reserved.
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