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Low-cost TI curtain device

: Ufheil, M.; Goetzberger, A.

Jesch, L.F.; Goetzberger, A. ; European Commission, Directorate-General for Energy; Fraunhofer-Institut für Solare Energiesysteme -ISE-, Freiburg/Brsg.:
5th International Meeting on Transparent Insulation Technology 1992. Proceedings
Birmingham: Franklin Company Consultants, 1992
ISBN: 0-9510781-6-X
International Meeting on Transparent Insulation Technology <5, 1992, Freiburg>
Conference Paper
Fraunhofer ISE ()
passive solar energy; Polytetrafluorethylen; PTFE; transient computer simulation; transparent insulation; TRNSYS

Within the framework of the passive solar energy research performed at the Fraunhofer Institute for Solar Energy Systems, a transparently insulated device, constructed with a double-sheet design, was developed for the exterior walls of buildings. Using the program TRNSYS, transient computer simulations estimated yearly heat gains of 41 kWh/qm for a massive south-facing wall in Freiburg. An opaque insulation with an U-value of 0.7 W/qm K (WVSO '82) has yearly heat losses of 57 kWh/qm. The energy efficiency of the TI curtain device was confirmed by experimental results. The absorber is manufactured by gluing a black, selective nickel laminate to a Polytetrafluoraethylen (PTFE) substrate. In March 1992, a sputtering technology, developed at the FHG- ISE, made it possible to cover large area PTFE substrates. Thus, a cost efficient manufacturing process for large absorber areas was enabled. In summer the double-sheets can either be rolled up or can be ventilated from behind by natural conve ction. First cost analyses show that the transparent insulated curtain device is competitive today.