Results 211 to 220 of about 23,068 (255)

Simple correlations between point daylight factor, average daylight factor and vertical daylight factor under all sky conditions and building design implications

Indoor and Built Environment, 2022
The customary method for calculating daylight illuminance in a building is the daylight factor approach, which is assumed under the conventional overcast sky. However, such an approach is not flexible enough to predict diffuse illuminance in the presence of non-overcast skies.
Wenqiang Chen, Siwei Lou, Hin Wa Li
exaly   +2 more sources

Analysis of daylight metrics of side-lit room in Canton, south China: A comparison between daylight autonomy and daylight factor

Energy and Buildings, 2017
Abstract To ensure sufficient daylight in rooms, daylight performance metrics are the basic references to guide building design or to benchmark a building against another in terms of daylighting in a room. Daylight factor (DF) is the most commonly accepted daylight performance metric, but it has limitations in evaluating the daylighting of a room ...
Yu Bian
exaly   +2 more sources

Daylight factor meter

Journal of Scientific Instruments, 1960
A brief survey and criticism of existing methods of measuring daylight factors is followed by a description of an improved daylight factor meter, in which the current outputs of two photoelectric cells are compared by a null-balance method. When one cell is exposed inside the building and the other outside, the ratio of the illuminations at the two ...
openaire   +1 more source

A simple daylight factor meter

Journal of Scientific Instruments, 1954
A simple daylight factor meter, based on a commercially available foot-candle meter, is described. An adjustable sensitivity device enables the reading to be set to a fixed value when the instrument is directed towards the open sky, thus fixing the denominator of the daylight factor fraction.
J Longmore, R G Hopkinson
openaire   +1 more source

A daylight factor integrator

Journal of Scientific Instruments, 1931
This instrument determines mechanically the illumination at a point on a horizontal surface due to the direct light from the sky visible at that point. The instrument is set up at the point, and a telescope incorporated in it is made to traverse the boundary of the visible sky.
openaire   +1 more source

The Daylight Factor Concept and the Lumen Method of Daylight Prediction

Architectural Science Review, 1963
(1963). The Daylight Factor Concept and the Lumen Method of Daylight Prediction. Architectural Science Review: Vol. 6, No. 2, pp. 67-81.
openaire   +1 more source

An objective method for measuring the daylight factor

Journal of Scientific Instruments, 1952
Daylight factors are measured by connecting two photocells in a bridge-circuit. Provisions are made in the instrument described to minimize errors due to: (a) deviation from the cosine law for incident light; (b) disparity between the sensitivity of the photocell and that of the human eye; (c) heating-up of the photocell in sunlight; (d) improper ...
W Koch, D Kaplan
openaire   +1 more source

Distribution of Daylight Factor in Classrooms

Advanced Materials Research, 2014
The study capability of pupils depends on many factors. One of the factors is the level and the quality of daylighting in classrooms. The daylighting quality is particularly important for very young pupils in primary schools and nurseries. This article deals with natural light in classrooms with different school equipment and furniture and various ...
openaire   +1 more source

Architectural Models for Measurement of Daylight Factor

Applied Mechanics and Materials, 2016
Daylight factor is one of the physical parameters affecting indoor environmental. We can determine this factor in many ways. The main ways are computational methods, in situ measurements and finally measurements in architectural models. Measurements in models enable us comparison both measurements under real sky and under artificial sky.
Daniela Bosova, Lenka Prokopova
openaire   +1 more source

Algorithms for calculation of daylight factors in streets

Lighting Research & Technology, 2002
This paper presents algorithms for calculation of sky components and daylight factors in linear building structures using the solid angle projection method. In order to estimate the precision of calculations two sky models; the uniform sky and CIE overcast sky, both giving equal illuminance on the horizontal plane, are used.
B Matusiak, Ø Aschehoug
openaire   +1 more source