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Technical Briefs

What is the Best Solution to Improve Thermal Performance of Storage Tanks With Immersed Heat Exchangers: Baffles or a Divided Tank?

[+] Author and Article Information
Aaron D. Wade, Jane H. Davidson, Julia F. Haltiwanger

Department of Mechanical Engineering, University of Minnesota, 111 Church Street, SE, Minneapolis, MN 55455

J. Sol. Energy Eng 131(3), 034503 (Jul 15, 2009) (5 pages) doi:10.1115/1.3142823 History: Received December 01, 2008; Revised December 18, 2008; Published July 15, 2009

Prior studies of indirect water storage tanks that employ an immersed heat exchanger to discharge the stored energy identified two potential methods of improving the rate of energy extraction: (1) an internal baffle to increase the velocity across the heat exchanger and (2) a divided storage compartment to achieve thermal stratification. The relative benefits of the two options are compared and recommendations for implementation are provided based in part on measurements in a 350 l tank with a 10 m long, 0.3m2 coiled tubular heat exchanger.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Options for an indirect storage tank with immersed heat exchanger

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Figure 2

Experimental apparatus for divided storage tank

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Figure 3

Comparison of heat transfer

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Figure 4

Comparison of effectiveness and NTU

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Figure 5

Comparison of storage temperatures

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Figure 6

Comparison of outlet temperatures

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Figure 7

Predicted improvement in heat transfer of the divided storage tank

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Figure 8

Predicted improvement in outlet temperature of the divided storage

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