The natural lighting intensity penetrating into interiors depends on a number of parameters, the light transmittance of the glazing being one of them. This parameter can be obtained by variable angle spectrophotometry. In the case of sunlight the results obtained on a series of commerciai glass sheets were combined with astronomical data for a given latitude and orientation of the façade and matrices were obtained which supply light transmittance as a function of time of the day and month of the year. Concerning skylight two particular cases were considered: the uniform luminance sky and the CIE overcast sky. More complex sky models variable in time and the presence of external or internal obstructions do not allow the behaviour of the glazing to be characterized by a single parameter. The daylighting in interiors can be evaluated thanks to suitable computer programs starting from the light transmittance of the glazing as a function of the angle of incidence if the intensity and the spectral distribution of the solar radiation are known. A computer code can be used for determining on an hourly base thwe natural illuminance distribution in a room with an aperture on the wall closed by the double glazings considered in this paper.

Daylighting performance parameters of glazings for buildings obtained by spectral measuraments at variable angle of incidence

PERON, FABIO;
1991-01-01

Abstract

The natural lighting intensity penetrating into interiors depends on a number of parameters, the light transmittance of the glazing being one of them. This parameter can be obtained by variable angle spectrophotometry. In the case of sunlight the results obtained on a series of commerciai glass sheets were combined with astronomical data for a given latitude and orientation of the façade and matrices were obtained which supply light transmittance as a function of time of the day and month of the year. Concerning skylight two particular cases were considered: the uniform luminance sky and the CIE overcast sky. More complex sky models variable in time and the presence of external or internal obstructions do not allow the behaviour of the glazing to be characterized by a single parameter. The daylighting in interiors can be evaluated thanks to suitable computer programs starting from the light transmittance of the glazing as a function of the angle of incidence if the intensity and the spectral distribution of the solar radiation are known. A computer code can be used for determining on an hourly base thwe natural illuminance distribution in a room with an aperture on the wall closed by the double glazings considered in this paper.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11578/53090
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