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Correlations of solar irradiance and daylight illuminance for building energy analysis

Technical Report ·
OSTI ID:6371956
;

The concept of luminous efficacy, the ratio of daylight illuminance to solar irradiance, is investigated for use in building energy analyses. Horizontal and vertical luminous efficacies are evaluated as functions of solar altitude, cloud condition, atmospheric extinction coefficient, turbidity, and season. Based on sky measurements made at the National Bureau of Standards, values of luminous efficacy for total, diffuse, and direct beam radiation are presented.

Research Organization:
National Bureau of Standards, Washington, DC (USA)
DOE Contract Number:
AC05-84OR21400
OSTI ID:
6371956
Report Number(s):
ORNL/Sub-81-22201/2; ON: DE85001736
Country of Publication:
United States
Language:
English

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Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320100* -- Energy Conservation
Consumption
& Utilization-- Buildings
BUILDINGS
CLOUD COVER
DAYLIGHTING
DIFFUSE SOLAR RADIATION
DIRECT SOLAR RADIATION
ENERGY ANALYSIS
INSOLATION
RADIATIONS
SEASONAL VARIATIONS
SOLAR FLUX
SOLAR RADIATION
STANDARDS
STELLAR RADIATION
TURBIDITY
VARIATIONS