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

Journal Article · Thu Oct 15 04:00:00 EDT 2009 · Solar Energy

DOI:https://doi.org/10.1016/J.SOLENER.2009.07.001· OSTI ID:21227421

Reddy, K S; Sendhil Kumar, N ^[1]

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1. Heat Transfer and Thermal Power Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, Tamilnadu 600036 (India)

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 {<=} {beta} {<=} 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. (author)

• OSTI ID: 21227421
• Journal Information: Solar Energy, Journal Name: Solar Energy Journal Issue: 10 Vol. 83; ISSN 0038-092X; ISSN SRENA4
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
CAVITY RECEIVERS
COMPARATIVE EVALUATIONS
CONFIGURATION
CORRELATIONS
HEAT LOSSES
INCLINATION
NATURAL CONVECTION
NUSSELT NUMBER
PARAMETRIC ANALYSIS
SOLAR CONCENTRATORS
THREE-DIMENSIONAL CALCULATIONS
TWO-DIMENSIONAL CALCULATIONS