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Title: Effect of pressure drop and longitudinal conduction on exergy destruction in a concentric-tube micro-fin tube heat exchanger

Authors: Binash Imteyaz; Syed M. Zubair

Addresses: Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, KFUPM Box # 1474, Dhahran 31261, Saudi Arabia ' Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, KFUPM Box # 1474, Dhahran 31261, Saudi Arabia

Abstract: A numerical study is carried out to predict the heat transfer characteristics and various exergy losses in a micro-fin concentric-tube double pipe heat exchanger. The results are compared with the experimental data from the literature and are found to be in a good agreement. The study is extended to include the effect of pressure drop and longitudinal conduction on the exergy losses. Furthermore, Ethylene Glycol-Water as a hot fluid is considered to investigate the effect of higher viscosity on the frictional irreversible losses. It is found that, at lower mass flow rates, fluid frictional irreversibility can be ignored for a low viscous fluid; however, there is a substantial exergy loss for a highly viscous fluid. At higher mass flow rates, fluid frictional irreversibility dominates over thermal irreversibility for both the fluids investigated in this study.

Keywords: micro-fin tube heat exchanger; exergy analysis; longitudinal conduction.

DOI: 10.1504/IJEX.2018.088888

International Journal of Exergy, 2018 Vol.25 No.1, pp.75 - 91

Available online: 21 Dec 2017 *

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