Abstract
Transparent or translucent insulation materials (TIM) represent a class of materials with a high potential for increasing the efficiency of solar thermal systems. A large number of materials and material combinations have been subjected to theoretical and experimental investigation. An overview of generic types, characterisation methods, simulation models, commercial materials, and actual systems is given, and the future potential of transparent insulation is shown as well as current market penetration. Results of selected demonstration projects with active and passive systems are presented. The most prominent application of transparent insulation was in the self-sufficient solar house in Freiburg. A detailed energy balance of this house is given. In addition the use of TIM in retrofitting as well as in low energy apartment blocks is discussed.
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