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Technical Briefs

Heat Transfer Properties and Energy-Exergy Efficiency in a Finned Cross-Flow Heat Recovery Unit

[+] Author and Article Information
Isak Kotcioglu1

Department of Mechanical Engineering, Atatürk University, 25240 Yakutiye, Erzurum, Turkeyikotcioglu@atauni.edu.tr

Ahmet Cansiz

Department of Electrical-Electronics Engineering, Atatürk University, 25240 Yakutiye, Erzurum, Turkey

1

Corresponding author.

J. Heat Transfer 133(4), 044503 (Jan 13, 2011) (4 pages) doi:10.1115/1.4002776 History: Received March 08, 2010; Revised September 28, 2010; Published January 13, 2011; Online January 13, 2011

In this study, a cross-flow heat recovery-exchanger system operating with unmixed fluids was manufactured and tested. The thermodynamic analysis of the system was presented via determining the variations of exergy loss with Reynolds number. The analysis also included the effects of convergent and divergent plate-type winglets on heat transfer properties of the designed system. Experimental tests consisted of temperature and pressure drop measurements for the Reynolds numbers (3000 and 12,000) according to the working conditions of the boiler, fan, preheater, and reheater. The effects of inlet conditions of the working fluids on the heat transfer characteristics were correlated via entropy generation number and exergy loss. The variation of the effectiveness with the number of transfer unit of heat recovery unit was calculated and discussed in terms of literature.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Geometric features of the ventilator matrix with placement of fins

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Figure 2

Variation of effectiveness with NTU

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Figure 3

Entropy generation number (Ns) as a function Reynolds number

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Figure 4

Variation of exergy loss with Reynolds number

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