A comparison of the advantages and disadvantages of concentrating collectors against conventional flat-plate collectors are presented. This is followed by the design of a parabolic-trough solar-collector system, due consideration having been given to collector-aperture and rim-angle...

Steady-state convective heat transfers across shaped, non-rectangular, closed-ended cavities containing air at atmospheric pressure have been measured. The thermal resistances of these are compared with previously published data for rectangular geometry cavities.