An improved model for natural convection heat loss from modified cavity receiver of solar dish concentrator

A 2-D model has been proposed to investigate the approximate estimation of the natural convection heat loss from modified cavity receiver of without insulation (WOI) and with insulation (WI) at the bottom of the aperture plane in our previous article. In this paper, a 3-D numerical model is presente...

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Bibliographic Details
Published in:Solar energy 2009-10, Vol.83 (10), p.1884-1892
Main Authors: Reddy, K.S., Sendhil Kumar, N.
Format: Article
Language:English
Subjects:
Aperture
Applied sciences
Bulging
CAVITY RECEIVERS
COMPARATIVE EVALUATIONS
CONFIGURATION
Convection
Convection modes
CORRELATIONS
Energy
Equipments, installations and applications
Exact sciences and technology
Heat
Heat loss
HEAT LOSSES
Heat transfer
Holes
INCLINATION
Mathematical models
Modified cavity receiver
NATURAL CONVECTION
Natural convection heat loss
Natural energy
NUSSELT NUMBER
Nusselt number correlations
Parameter estimation
PARAMETRIC ANALYSIS
Receivers
Solar collectors
SOLAR CONCENTRATORS
Solar dish concentrator
SOLAR ENERGY
Solar thermal conversion
THREE-DIMENSIONAL CALCULATIONS
TWO-DIMENSIONAL CALCULATIONS
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Summary:A 2-D model has been proposed to investigate the approximate estimation of the natural convection heat loss from modified cavity receiver of without insulation (WOI) and with insulation (WI) at the bottom of the aperture plane in our previous article. In this paper, a 3-D numerical model is presented to investigate the accurate estimation of natural convection heat loss from modified cavity receiver (WOI) of fuzzy focal solar dish concentrator. A comparison of 2-D and 3-D natural convection heat loss from a modified cavity receiver is carried out. A parametric study is carried out to develop separate Nusselt number correlations for 2-D and 3-D geometries of modified cavity receiver for estimation of convective heat loss from the receiver. The results show that the 2-D and 3-D are comparable only at higher angle of inclinations (60° ⩽ β ⩽ 90°) of the receiver. The present 3-D numerical model is compared with other well known cavity receiver models. The 3-D model can be used for accurate estimation of heat losses from solar dish collector, when compared with other well known models.
ISSN:0038-092X
1471-1257
DOI:10.1016/j.solener.2009.07.001