Fluidized Bed Solar Collector

[+] Author and Article Information
L. R. Glicksman

Department of Architecture, Massachusetts Institute of Technology, Cambridge, MA 02139

J. Azzola

Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139

J. Modlin

Department of Mechanics, United States Military Academy, West Point, NY 10996

J. Sol. Energy Eng 110(4), 321-326 (Nov 01, 1988) (6 pages) doi:10.1115/1.3268274 History: Received August 01, 1986; Revised August 01, 1988; Online November 11, 2009


An air fluidized bed, contained in the wall cavity of an exterior building wall, forms the basis of a new solar collector design which is simpler than a water-cooled collector and has a thermal performance superior to that of an air-cooled collector. The fluidized bed serves as an intermediate heat transfer medium between a solar flux absorbed on the external building surface and a liquid thermal transfer loop. Fluidized beds yield heat-transfer coefficients an order of magnitude higher than single phase air flow. Low density particles are used in the bed to minimize power consumption. When defluidized, the bed acts as a good thermal insulator. Recent experimental results are presented for the heat-transfer coefficients of the immersed tubes, bounding walls, the effective conductivity of the bed, and the overall full-scale thermal design efficiency for various low density materials. Structural and power consumption performance is examined as well. An integrated fluidized bed solar collector design is proposed and compared with representative water and air collector designs.

Copyright © 1988 by ASME
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