Portable solar energy appliance with cooking and water heating

摘要

The appliance has a frame formed like a conventional umbrella or parasol frame, with a special covering made of thin, highly-polished aluminium foil. The outside of the foil has a thin plastics foil coating, and the frame forms an octagonal parabolic reflector (1) when open. The reflector concentrates incoming solar radiation in a focal point, which is located on the line of the inclined umbrella stick axis (4), and above it. The reflector is fastened to a stationary fold-down stand (6), via a pivot or turning joint (5). A cooker or water-heater plate (7) is screwed to the top of the stand. A second fastener unit consists of a pivoted forked connection and a telescopic rod (8), for continuous and precise inclination of the reflector into the sun.