Detailed parametric analyses of heat transfer in CPC solar energy collectors

• Published in: Solar energy Vol. 50; no. 4; pp. 321 - 338
• Main Authors: Eames, P.C., Norton, B.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.04.1993; Elsevier; Pergamon Press Inc
• Subjects: 141000 - Solar Collectors & Concentrators; ANGULAR CORRELATION; Applied sciences; capteur solaire; colectores solares; COMPOUND PARABOLIC CONCENTRATORS; CONVECTION; CORRELATIONS; echange thermique; ENERGY; ENERGY SOURCES; ENERGY TRANSFER; Exact sciences and technology; GRASHOF NUMBER; Heat; HEAT TRANSFER; INCLINATION; MASS TRANSFER; modele; modelos; NATURAL CONVECTION; Natural energy; NUSSELT NUMBER; PARAMETRIC ANALYSIS; RENEWABLE ENERGY SOURCES; Solar collectors; SOLAR CONCENTRATORS; SOLAR ENERGY; SOLAR EQUIPMENT; Solar thermal conversion; transferencia termica; Tilt angle; Nusselt number; Cavity; Solar energy concentrator; Numerical simulation; Natural convection; Heat transfer; Compound concentrator; Parabolic concentrator
• ISSN: 0038-092X; 1471-1257
• DOI: 10.1016/0038-092X(93)90027-L

A detailed parametric analysis of heat transfer in compound parabolic concentrating solar energy collectors has been performed, using a unified model for their optical and thermophysical behaviour. The effects of angular inclination and collector acceptance angles on free convection within the cavity are presented. The circumferential variation of local Nusselt number about the absorber is determined. A convective heat transfer correlation is obtained for the average Nusselt number with respect to Grashof number that takes into account acceptance angle and angular inclination. The developed correlation is extended to truncated compound parabolic concentrators.