CONVECTIVE HEAT TRANSFER CORRELATIONS FOR AN ENCLOSED HORIZONTAL COMPOUND PARABOLIC CAVITY SOLAR THERMAL COLLECTOR

Abstract

Abstract Correlations between Nusselt and Grashof numbers have been proposed for convective heat transfer in compound parabolic concentrating solar energy collectors (CPCs). The discrepancies between these correlations are discussed. CPC designs considered range from a tubular absorber with or without an envelope; with one or two concentric envelopes; with eccentric envelopes; with various levels of reflector truncation and for a range of system inclination angles.