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A Flat Plate Multiple Pass Solar Collector Using Aqueous Optical Properties

This paper describes a flat plate multiple pass solar collector which is believed to be new to the subject and gaps the need between concentrators (which typically are associated with high cost of manu-facture and vulnerability to the elements) and the conventional flat plate collectors (which typically reradiate as much energy as received on reaching a temperature level less than suitable for air conditioning. This new multiple pass flat plate collector performs optically by taking advantage of two fortuitous characteristics of plain water; one, high transparency in the visible spectrum, and two, near total opacity in the infrared. As solar energy heats the water, its potential radiative escape is via the infrared. A simple multiple pass system impacts the solar energy sequentially as it is blocked by opacity of the water in the earlier passages. The design is also such that it minimizes air convection losses by virtue of the layers of the multipass system. The function of the design has been confirmed by computer analysis. A model has been built and tests are in progress.