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TECHNICAL PAPERS

Characteristic Heat Removal Efficiency for Thermosyphon Solar Water Heaters During the System Application Phase

[+] Author and Article Information
J. M. Chang

Department of Mechanical Engineering, Far East College, No. 49, Chung-Hwa Road, Hsin-Shih Town, Tainan County, 744, Taiwan

J. Sol. Energy Eng 126(3), 950-956 (Jul 19, 2004) (7 pages) doi:10.1115/1.1753576 History: Received July 01, 2003; Revised February 01, 2004; Online July 19, 2004
Copyright © 2004 by ASME
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References

Brinkworth,  B. J., 2001, “Solar DHW System Performance Correlation Revisited,” J. Sol. Energy Eng., 71, pp. 377–387.
Andres,  A. Carrillo, and Lopez,  J. M., 2002, “TRNSYS Model of a Thermosyphon Solar Domestic Water Heater with a Horizontal Store and Mantle Heat,” J. Sol. Energy Eng., 72, pp. 89–98.
Colle, S., Abreu, S. L., Glitz, K., and Colle, F., 2001, “Optimization of the Auxiliary Heating and Water Storage Insulation of a Low Cost Domestic Hot Water Heating System with an Electric Shower,” Proc. of ISES 2001 Solar World Congress, Adelaide, South Australia, November 25 to December 2.
Cabelli,  A., 1977, “Storage Tanks—A Numerical Experiment,” J. Sol. Energy Eng., 19, pp. 45–57.
Knudsen, S., Furbo, S., and Shah, L. J., 2001, “Design of the Inlet to the Mantle in a Vertical Mantle Storage Tank,” Proc. of ISES 2001 Solar World Congress, Adelaide, South Australia, November 25 to December 2.
Shah, L. J., Andersen, E., Furbo, S., Knudsen, S., and Heller, A. J., 2001, “Entrance Effects in Solar Hot Water Stores,” Proc. of ISES 2001 Solar World Congress, Adelaide, South Australia, November 25 to December 2.
CNS Standard B7276, No. 12557, 1989, “Method of Test for Thermal Performance of Solar Storage Tanks,” Central Bureau of Standard, Ministry of Economic Affairs, Taiwan.
JIS A 1426, 1995, “Test Method of Thermal Performance for Solar Storage Tanks,” Published by Japanese Standards Association.
ANSI/ASRAE 94.2-1981, 1981, “Methods of Testing—Thermal Storage Devices with Electrical Input and Thermal Output Based on Thermal Performance,” Approved by ASHRAE Standards Committee.
DD ENV 12977-3, 2001, “Thermal Solar Systems and Components—Custom Built Systems Part 3 Performance Characterization of Stores for Solar Heating Systems,” Published by British Standards Publishing Limited (BSPL).
Londono,  A., and Rivera,  A., 2003, “Maximization of Energy Output from Volumetric Absorption Solar Collectors,” ASME J. Sol. Energy Eng., 125, pp. 83–86.
Abernethy, R. B., Benedict, R. P., and Dowdell, R. B., 1983, “ASME Measurement Uncertainty,” ASME paper 83-WA/FM-3.

Figures

Grahic Jump Location
Experimental testing system configuration employed to evaluate the heat removal efficiency of various thermosyphon systems
Grahic Jump Location
Heat removal patterns of System A for: (a)–(c) presenting the case of different discharge flow rates V̇d at constant Ti−T̄w=14.5°C,20.6°C,26.3°C, respectively and (d) different temperature differences Ti−T̄w at constant discharge flow rate V̇d=10 L/min. (Note that normalized time=testing time/time tf. The term “drop-off point” refers to the value of the data point on the Te−Tw curve at which it quickly drops at least 3% in comparison with the value of its relative data on the Ti−T̄w curve).
Grahic Jump Location
Relationship between heat removal efficiency, (Ti−T̄w) and V̇d for Systems A and B
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Empirical models of heat removal efficiency for: (a) System A with data correlation coefficient Rxy=0.901, (b) System B with data correlation coefficient Rxy=0.889, (c) System C with data correlation coefficient Rxy=0.967 and (d) System D with data correlation coefficient Rxy=0.904
Grahic Jump Location
Relationship between heat removal efficiency and integrated parameter (Ti−T̄w)/V̇d derived from analysis of the experimental data for Systems A, B, C and D. (Note that the characteristic heat removal efficiency, ηR*, is defined as the value of ηR at (Ti−T̄w)/V̇d=2.0)
Grahic Jump Location
Design performance curve for system’s storage tank geometry dimensions to optimize the characteristic heat removal efficiency of a system. (Note that the data correlation coefficient Rxy=0.856)

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