Solar collector for converting solar radiation into heat, has film with reversibly alterable transmissivity to allow normal operation and overheating prevention

摘要

A fixedly installed film (6) is arranged between an absorber (3) and a window (2). The film has the same characteristics over its area and/or is reversibly changeable in terms of its transmissivity to solar light so that it can assume a state of maximum transmissivity with 80 per cent transmission for the sunlight transmitted through the window. The film can preferably assume two switchable states for normal operation and for overheating prevention.