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TECHNICAL PAPERS

Thermal Penalty of an Immersed Heat Exchanger in Integral Collector Storage Systems*

[+] Author and Article Information
Saurabh Arora, Jane Davidson, Susan Mantell

Department of Mechanical Engineering, University of Minnesota, 111 Church St. S.E., Minneapolis, MN 55455

Jay Burch

National Renewable Energy Laboratory Golden, CO

J. Sol. Energy Eng 123(3), 180-186 (Feb 01, 2001) (7 pages) doi:10.1115/1.1384573 History: Received November 01, 2000; Revised February 01, 2001
Copyright © 2001 by ASME
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References

Figures

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A conventional ICS system
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A proposed polymer ICS system with immersed load-side heat exchanger
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Plot of heat exchanger penalty ratio as a function of the average effectiveness of the heat exchanger and the dimensionless parameter X=ULAcΔt/Mdrawcp
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Weekday hot water load profile 13. The delivered water temperature is assumed to be 330K
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Weekend hot water load profile 13. The delivered water temperature is assumed to be 330K
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Dependence of effectiveness on NTU for an immersed heat exchanger
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The effect of temperature on the fluid properties in the natural convection thermal resistance
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Dependence of heat exchanger effectiveness on ΔT and film temperature. These curves are developed for two polymer heat exchangers described in Table 1.
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Histogram of effectiveness for the combined ICS/heat exchanger #1 system in Phoenix. These values were determined using TRNSYS type 222. The heat exchanger is described in Table 1. The flow rates are based on the load profiles in Figs. 4 and 5.
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Histogram of effectiveness for the combined ICS/heat exchanger #2 system in Phoenix. These values were determined using TRNSYS type 222. The heat exchanger is described in Table 1. The flow rates are based on the load profiles in Figs. 4 and 5.
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Comparison of calculated and simulated penalty factors for two combined ICS/heat exchanger systems in Phoenix, AZ. The calculated values are based on the average simulated temperatures, shown in Figs. 9 and 10. The heat exchangers are described in Table 1.
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(a) and (b) Comparison of calculated and simulated annual and monthly efficiencies for two combined ICS/heat exchanger systems in Phoenix, AZ. The calculated values are determined using property values at Tfilm = 320K. The values of the ΔT used in the calculated penalty factor are from the conservative and iterative procedures. (a) HX #1 with Ahx = 2.9 m2. (b) HX #2 with Ahx = 0.28 m2. The heat exchangers are described in Table 1.

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