INFO
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Contact Info
| Address | SPF Institut für Solartechnik, Hochschule für Technik Rapperswil HSR Oberseestr. 10 8640 Rapperswil |
| Country | Switzerland |
| Get in contact with SPF Institut für Solartechnik, Hochschule für Technik Rapperswil HSR |
Products or Machinery
Your partner when it comes to Solar Keymark, testing and certification of thermal collectors, systems and components. Your experts for research and development, for consulting in the area of materials, technologies, systems and software. New SPF Info-CD.
Classes of efficiency
According to their efficiencies, the transparent covers (e.g. glazing) can be associated with the following classes of efficiency:
untreated glasses
Class U1 ηGL >= 0.900
Class U2 ηGL >= 0.885
Class U3 ηGL >= 0.870
Class U4 ηGL >= 0.850
Not solar glass ηGL < 0.850
treated glasses (without AR,
also for example dust repellent)
Class Z1 ηGL >= 0.900
Class Z2 ηGL >= 0.885
Class Z3 ηGL >= 0.870
Class Z4 ηGL >= 0.850
Not solar glass ηGL < 0.850
AR-treated glasses
Class X1 ηGL >= 0.950
Class X2 ηGL >= 0.935
Class X3 ηGL >= 0.920
Class X4 ηGL >= 0.890
Not solar glass ηGL < 0.890
