Correction for the absorber edge effect in analytical models of flat plate solar collectors
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Authors
Author (Corporation)
Publication date
2013
Typ of student thesis
Course of study
Collections
Type
01A - Journal article
Editors
Editor (Corporation)
Supervisor
Parent work
Solar Energy
Special issue
DOI of the original publication
Link
Series
Series number
Volume
95
Issue / Number
Pages / Duration
181-191
Patent number
Publisher / Publishing institution
Elsevier
Place of publication / Event location
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Abstract
Analytical models based on the theory of Hottel and Whillier (1958) overestimate the efficiency of solar collectors with single plate absorbers because the absorber tubes of real absorbers are usually not bonded up to the edge of the absorber plate. Based on two-dimensional numerical simulations, a correction factor has been derived. This correction factor, multiplied to the standard fin efficiency defined by the analytical model, takes the edge effect into account within 0.5% when compared to the numerical results. The advantage is twofold: The extended analytical model enables more rigorous cost- and efficiency optimization of the absorber, which is the most expensive part of a flat plate solar collector. Since one of the major uncertainties of the analytical model is eliminated by the addition of the correction factor, parametric studies will be more accurate. If the efficiency characteristics, the geometrical data and the material properties of a sufficient number of collectors are known, the enhanced model could be used to derive more accurate correlations for the heat loss coefficients.
Keywords
Solar collector, Cost reduction, Analytical model, Thermal efficiency, Two-dimensional effect, Numerical simulation
Subject (DDC)
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ISBN
ISSN
0375-9865
1471-1257
0038-092X
1471-1257
0038-092X
Language
English
Created during FHNW affiliation
No
Strategic action fields FHNW
Publication status
Published
Review
Peer review of the complete publication
Open access category
License
Citation
Eismann, R. (2013). Correction for the absorber edge effect in analytical models of flat plate solar collectors. Solar Energy, 95, 181–191. https://doi.org/10.1016/j.solener.2013.06.009