Schmidt, C.C.SchmidtGoetzberger, AdolfAdolfGoetzbergerSchmid, J.J.Schmid2022-03-082022-03-081988https://publica.fraunhofer.de/handle/publica/315310Transparent Insulation Material (TIM) has been used in integrated collector storage (ICS) prototypes developed at the Fraunhofer Institut für Solare Energiesysteme (ISE). Two prototypes (1st generation) without a second, freeze-protecting circuit, have been investigated under stagnation conditions and with water withdrawal during one year at the ISE outdoor test site (/1/, /2/). No damage due to freezing occurred.en621697conference paper