Abstract:A glass pipe and an absorbing black fluid were combined with a parabolic solar reflector into a solar collector. Thermal efficiencies for three different types of receivers with a parabolic trough solar reflector were compared: (1) single glass pipe with black fluid, (2) concentric annulus glass pipes with black fluid, and (3) black-painted copper tubing. The single glass pipe with a black working fluid performed best experimentally. The single glass pipe with a black fluid was better than the black painted co… Show more
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