Parabolic Solar Collector With Glass Pipe and Black Fluid

[+] Author and Article Information
M. J. Chang

University of Mississippi, University, MS 38677

J. A. Roux

Mechanical Engineering, University of Mississippi, University, MS 38677

J. Sol. Energy Eng 108(2), 129-134 (May 01, 1986) (6 pages) doi:10.1115/1.3268079 History: Received May 01, 1984; Online November 11, 2009


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 copper tube by an average value of 5 percent absolute system efficiency or 14 percent on a total energy absorbed basis. Mass flow rate and wind speed were analytically found to be significant. The black fluid solar collector was found to have an optimum system efficiency for a blackening agent concentration of 15 ml per gallon of water. A numerical lumped heat capacity model was used to compare with the experimental data.

Copyright © 1986 by ASME
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