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Experimental investigation and computational validation of heat losses from the cavity receiver used in linear Fresnel reflector solar thermal system

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Title Experimental investigation and computational validation of heat losses from the cavity receiver used in linear Fresnel reflector solar thermal system
 
Creator SAHOO, SS
VARGHESE, SM
KUMAR, CS
VISWANATHAN, SP
SINGH, S
BANERJEE, R
 
Subject LFR
Solar thermal
CFD
Overall heat loss coefficient
CONCENTRATOR
ABSORBER
 
Description This paper presents the analysis of heat losses from the trapezoidal cavity receiver used in linear Fresnel reflector (LFR) system. The experimental studies are conducted under laboratory conditions that are specially designed for this purpose. The effects of parameters such as the temperatures of the tube surface, depth of receiver, number of tubes, and emissivity of tubes are investigated. The loss of heat is taking place from the tube outer surface to glass cover, below the receiver and then glass cover to ambient. As part of this investigation, the system is modelled and simulated using computational fluid dynamics (CFD). After validation, contribution of convection and radiation to the total heat transfer are found out using CFD. Computational predictions are shown to be consistent with the experimental observations which show that the CFD model is a reliable tool for predicting heat loss and overall heat loss coefficient. It was found that losses due to convection are between 5 and 18% of the total heat losses. (C) 2012 Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2014-10-15T10:42:49Z
2014-10-15T10:42:49Z
2013
 
Type Article
 
Identifier RENEWABLE ENERGY, 5518-23
http://dx.doi.org/10.1016/j.renene.2012.11.036
http://dspace.library.iitb.ac.in/jspui/handle/100/14774
 
Language en