Calculation of the proportion of sky seen by windows with finite horizontal and vertical projections

Journal Article · Wed Jun 01 04:00:00 EDT 1994 · Solar Energy (Journal of Solar Energy Science and Engineering); (United States)

DOI:https://doi.org/10.1016/0038-092X(94)90663-7· OSTI ID:7244847

Delsante, A E; Spencer, J W ^[1]

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1. CSIRO Division of Building, Construction and Engineering, Victoria (Australia)

This paper presents convenient analytical expressions for the proportion of sky seen by windows shaded by horizontal or vertical projections of any width and of finite or infinite length. The projections may be offset from the window edge, and horizontal projections may be placed asymmetrically over the window. These expressions can be used to calculate the diffuse radiation incident on the shaded window, assuming that the radiation is isotropically distributed. Comparisons with other less general or less convenient methods show excellent agreement. The errors involved in using the simpler expressions for infinite-width projections to describe finite-width projections are quantified, and are found to be small in practical cases.

• OSTI ID: 7244847
• Journal Information: Solar Energy (Journal of Solar Energy Science and Engineering); (United States), Journal Name: Solar Energy (Journal of Solar Energy Science and Engineering); (United States) Vol. 52:6; ISSN SRENA4; ISSN 0038-092X
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320107* -- Energy Conservation
Consumption
& Utilization-- Building Systems-- (1987-)
ARCHITECTURE
CALCULATION METHODS
COMPARATIVE EVALUATIONS
DAYLIGHTING
DIFFUSE SOLAR RADIATION
EVALUATION
OPENINGS
RADIATIONS
SHADING
SOLAR ARCHITECTURE
SOLAR FLUX
SOLAR RADIATION
STELLAR RADIATION
WINDOWS