Solar-energy stimulated, open-looped thermosyphonic air heaters

B. Norton and S.D. Probert

Applied Energy, 1984, vol. 17, issue 3, 217-234

Abstract: The behaviours of solar-energy collectors for use in a thermosyphon air-heating system are discussed. Almost identical instantaneous collector efficiencies are achieved by collectors whose base surfaces (which are orthogonal to the direct insolation) have fins which run parallel with, or perpendicular to, the mean convecting air flow direction in the collector. Those surfaces with fins perpendicular to the flow are shown to have longer thermal response periods to changes in insolation than surfaces with fins parallel to the air stream. The latter arrangement exhibited an almost equal response period to that achieved by a plane surface.

Date: 1984
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