Solar collector has molecular flow in intermediate spaces between front glass panel and absorber sheet and between 2 relatively spaced sheets at rear of heat transfer fluid pipeline behind absorber sheet

摘要

The solar collector has an absorber sheet (2) for incident light, covered on its front side with a glass panel (1) and provided at its rear with a pipeline (5) in good thermal contact with it, through which a heat transfer fluid is passed. The glass panel is held at a spacing of between 0.3 and 4 mm from the absorber sheet via transparent spacers (4), with 2 further sheets (9,10) at a similar relative spacing positioned at the rear of the pipeline, with the glass panel and the rear sheet sealed together around their edges.The spaces (3,11) between the absorber sheet and the glass panel and between the rear sheets are at a pressure which ensures a molecular flow characteristic.