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Fenestration devices for energy conservation—III. The influence of angle-dependent shading coefficients on energy savings

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  • Brambley, M.R.
  • Penner, S.S.

Abstract

The results of measured, angle-dependent, solar-optical properties are presented for a window film and a sunscreen. These properties are used to determine shading coefficients as functions of the angle of incidence of the direct solar radiation. Energy savings for the cooling season (in the transition climatic region of San Diego County) have been estimated and are compared with results for constant values of the shading coefficients. Constant values of the shading coefficients, derived from solar-optical properties for normally incident direct solar radiation, lead to high estimates (errors of < 10 centsm2−yr) of energy savings for window films and low estimates (errors of < $1.00m2−yr) for sunscreens.

Suggested Citation

  • Brambley, M.R. & Penner, S.S., 1981. "Fenestration devices for energy conservation—III. The influence of angle-dependent shading coefficients on energy savings," Energy, Elsevier, vol. 6(1), pages 61-71.
    • Handle: RePEc:eee:energy:v:6:y:1981:i:1:p:61-71
    DOI: 10.1016/0360-5442(81)90103-1
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