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- W2051403411 abstract "A method for careful outdoor characterization of the angular dependent solar transmittance of solar glazing is developed and used for investigating the performance of structured and antireflection treated glass. Two identical collectors are series connected in order to get an identical flow. The reference collector is always covered with a thin Teflon foil and the test collector is furnished with the investigated covers. The method is carried out in six steps: (1) The collectors are long term tested in order to get the collector parameters, especially the U-values. (2) The performances of the collector at a temperature close to ambient are monitored during a clear day. (3) The effect of heat losses is eliminated from the knowledge of the U-values, and the optical efficiencies of the collectors are derived. (4) The ratio between optical efficiency of the test — and the reference collector is calculated. (5) Both collectors are tested with a Teflon film, with well-known optical properties, as a cover and the relative optical efficiency is derived. (6) From the relative transmittance between the investigated glazings and Teflon, the absolute value of the angular dependent transmittance is derived. The results show good agreement with conventional optical characterization. The commercial antireflection treatment increases the solar transmittance by 4% and the annual output by 9%. The structured glass shows similar angular performance as a flat glass if the structure is faced outwards, but shows a lower transmittance for incidence angles exceeding 40° if the structure is faced inwards. This means that the annual performance is decreased by 4% by facing the structure inwards instead of outwards." @default.
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- W2051403411 date "2001-07-01" @default.
- W2051403411 modified "2023-09-28" @default.
- W2051403411 title "Angular dependent optical properties from outdoor measurements of solar glazings" @default.
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- W2051403411 doi "https://doi.org/10.1016/s0038-092x(01)00061-5" @default.
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