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Analytical expression for circumferential and axial distribution of absorbed flux on a bent absorber tube of solar parabolic trough concentrator

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Title Analytical expression for circumferential and axial distribution of absorbed flux on a bent absorber tube of solar parabolic trough concentrator
 
Creator KHANNA, S
KEDARE, SB
SINGH, S
 
Subject Parabolic trough
Tubular receiver
Bending
Flux distribution
Optical errors
Gaussian sun shape
COLLECTORS
PERFORMANCE
DESIGN
 
Description A parabolic trough has a property to concentrate the incident rays at its focal line, when tracked appropriately. The flux distribution on the absorber tube is non-uniform. Part of the absorber's periphery facing the sun receives direct incident rays where as part of the other side receives concentrated rays resulting in circumferential non-uniform flux distribution. The intensity of flux also varies along the length of the absorber tube, especially at the sun facing end, depending upon the incidence angle of the sun rays and rim angle of the parabolic cylinder. Such non-uniformity in the flux distribution on the absorber tube leads to non-uniform temperature distribution. Thus the absorber experiences thermal stresses which may lead to bending of the tube thereby creating risk of glass cover damage. In order to estimate the extent of bending, study of the flux distribution is needed. In the present work, expression for the absorbed flux on a bent absorber tube accounting circumferential and axial variations is analytically derived. Optical errors and Gaussian sun shape have also been incorporated. Results have been plotted to study the effect of bending, optical errors and rim angle of the trough on flux distribution. (C) 2013 Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2014-10-16T06:34:38Z
2014-10-16T06:34:38Z
2013
 
Type Article
 
Identifier SOLAR ENERGY, 9226-40
http://dx.doi.org/10.1016/j.solener.2013.02.020
http://dspace.library.iitb.ac.in/jspui/handle/100/15446
 
Language en