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Title: A replaceable reflective film for solar concentrators

The 3M Company manufactures a silvered acrylic film called ECP-305 that is regarded as the preferred reflective film for use on stretched-membrane heliostats. However, ECP-305 will degrade in time, due to both corrosion of the silver layer and delamination at the film's silver-to-acrylic interface, and will eventually need to be replaced. 3M uses a very aggressive adhesive on this film, and once it is laminated, replacement is very difficult. The purpose of this investigation was the development of a replaceable reflector, a reflective film that can be easily removed and replaced. A replaceable reflector was successfully configured by laminating ECP-305 to the top surface of a smooth, dimensionally stable polymer film, with a removable adhesive applied to the underside of the polymer film. Several stages of screening and testing led to the selection of a 0.010-inch thick polycarbonate (GE 8030) as the best polymer film and a medium tack tape (3M Y-9425) was selected as the best removable adhesive. To demonstrate the feasibility of the replaceable reflector concept and to provide a real-time field test, the chosen construction was successfully applied to the 50-m{sup 2} SKI heliostat at the Central Receiver Test Facility at Sandia National Laboratories in Albuquerque. 4more » refs., 13 figs., 7 tabs.« less
Publication Date:
OSTI Identifier:
5109102
Report Number(s):
SAND-91-7006
ON: DE92002936
DOE Contract Number:
AC04-76DP00789
Resource Type:
Technical Report
Research Org:
Sandia National Labs., Albuquerque, NM (United States); Industrial Solar Technology, Denver, CO (United States)
Sponsoring Org:
DOE; USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; FILMS; ADHESION; REMOVAL; REFLECTIVE COATINGS; FEASIBILITY STUDIES; ADHESIVES; DESIGN; HELIOSTATS; MEMBRANES; POLYACRYLATES; POLYCARBONATES; POLYESTERS; POLYETHYLENES; POLYSTYRENE; PVC; SILVER; SOLAR CONCENTRATORS; CARBON COMPOUNDS; CARBONATES; CHLORINATED ALIPHATIC HYDROCARBONS; COATINGS; ELEMENTS; EQUIPMENT; ESTERS; HALOGENATED ALIPHATIC HYDROCARBONS; MATERIALS; METALS; ORGANIC CHLORINE COMPOUNDS; ORGANIC COMPOUNDS; ORGANIC HALOGEN COMPOUNDS; ORGANIC POLYMERS; OXYGEN COMPOUNDS; PETROCHEMICALS; PETROLEUM PRODUCTS; PLASTICS; POLYMERS; POLYOLEFINS; POLYVINYLS; SOLAR EQUIPMENT; SYNTHETIC MATERIALS; TRANSITION ELEMENTS 141000* -- Solar Collectors & Concentrators; 360603 -- Materials-- Properties; 360601 -- Other Materials-- Preparation & Manufacture