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Title: CPCs with segmented absorbers

Abstract

One of the most promising means of improving the performance of solar thermal collectors is to reduce the energy lost by the hot absorber. One way to do this, not currently part of the technology, is to recognize that since the absorber is usually not irradiated uniformly, it is therefore possible to construct an absorber of thermally isolated segments, circulate the fluid in sequence from low to high irradiance segments, and reduce loss by improving effective concentration. This procedure works even for ideal concentrators, without violating Winston's theorem. Two equivalent CPC collectors with single and segmented absorber were constructed and compared under actual operating conditions. The results showed that the daily thermal efficiency of the collector with segmented absorber is higher (about 13%) than that of the collector with nonsegmented absorber.

Authors:
;  [1]
  1. (Univ. of Miami, Coral Gables, FL (United States))
Publication Date:
OSTI Identifier:
5915628
Resource Type:
Journal Article
Resource Relation:
Journal Name: Solar Energy (Journal of Solar Energy Science and Engineering); (United States); Journal Volume: 47:4
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; SOLAR ABSORBERS; PERFORMANCE TESTING; SOLAR COLLECTORS; THERMAL EFFICIENCY; COMPARATIVE EVALUATIONS; DESIGN; HEAT LOSSES; EFFICIENCY; ENERGY LOSSES; EQUIPMENT; EVALUATION; LOSSES; SOLAR EQUIPMENT; TESTING; 141000* - Solar Collectors & Concentrators

Citation Formats

Keita, M., and Robertson, H.S.. CPCs with segmented absorbers. United States: N. p., 1991. Web. doi:10.1016/0038-092X(91)90118-G.
Keita, M., & Robertson, H.S.. CPCs with segmented absorbers. United States. doi:10.1016/0038-092X(91)90118-G.
Keita, M., and Robertson, H.S.. Tue . "CPCs with segmented absorbers". United States. doi:10.1016/0038-092X(91)90118-G.
@article{osti_5915628,
title = {CPCs with segmented absorbers},
author = {Keita, M. and Robertson, H.S.},
abstractNote = {One of the most promising means of improving the performance of solar thermal collectors is to reduce the energy lost by the hot absorber. One way to do this, not currently part of the technology, is to recognize that since the absorber is usually not irradiated uniformly, it is therefore possible to construct an absorber of thermally isolated segments, circulate the fluid in sequence from low to high irradiance segments, and reduce loss by improving effective concentration. This procedure works even for ideal concentrators, without violating Winston's theorem. Two equivalent CPC collectors with single and segmented absorber were constructed and compared under actual operating conditions. The results showed that the daily thermal efficiency of the collector with segmented absorber is higher (about 13%) than that of the collector with nonsegmented absorber.},
doi = {10.1016/0038-092X(91)90118-G},
journal = {Solar Energy (Journal of Solar Energy Science and Engineering); (United States)},
number = ,
volume = 47:4,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1991},
month = {Tue Jan 01 00:00:00 EST 1991}
}