| Popis: |
The use of polymers as solar collector covers presents some real advantages, but it is necessary to consider their durability in such conditions. The first stage consists in the identification and measurement of agressive agents which affect solar collector covers. We present the results of measurements on the covers of several solar collectors in normal ardextreme working conditions. Collected datas are used to determine an accelerated degradation test, the effect of which is characterisedby useful properties measurements(so1ar transmittance, mechanical resistance) of the considered materials : polycarbonate, polymethylmetacrylate, glass fiber reinforced polyester. Same measurements, done on the same materials submitted to natural wheathering (whithout absorber behind) wou1.d permit the utilisation of existing knowledge on durability of polymers in building applications. |
