The effects of receiver misplacement and the trough pointing towards the sun on the concentration characteristics of a composite parabolic trough are discussed. Results from some numerical calculations are presented graphically and discussed.

The concentration characteristics of an inverted [`]vee'-type Fresnel lens have been studied. The variation in lens transmittance with groove position for different slope angles is represented graphically, showing a better transmittance at higher slope angles. The distribution of the local...

The geometrical optical performance characteristics of a composite parabolic trough (CPT) with a fin receiver have been studied. The variation of geometrical concentration ratio with mirror element size and the rim angle of the parent parabola has been studied and the results are presented...

The constant flow ground collector/storage system consists of a network of pipes buried in the ground; the top surface is black ened and covered with a thermal trap. For a 0·05 m thickness of thermal trap and for a 0·14 m depth of the plane of heat retrieval, the collection efficiency of...

The geometrical concentration characteristics of a two-stage system employing a composite parabolic trough as a primary--and a compound parabolic concentrator as a secondary--concentrator are discussed. The relative merits of such a two-stage system over a single-stage CPT are brought out from...

This paper examines the feasibility of utilising solar energy to heat buildings having galvanised iron sheet roofs with false ceilings beneath. Numerical predictions are presented for a typical roof area of 2200 m2, below which air is blown at a speed of 2·16 km/h. If, for proper ventilation,...

The variation of the geometrical concentration ratio for cylindrical and flat plate receivers with the strip width of a composite cylindrical parabola concentrator has been examined numerically in cases when the edges of the constituent strips lie on the parent parabola.