Publication

A fast daylight model suitable for embedded controllers

2009
Journal Articles

Abstract

This paper describes a fast daylight model suitable or embedded daylight controllers. For a given room geometry (including position and tilt of venetian blinds, and the sun's position), the indoor illuminances are modeled as a linear combination of outdoor global and diffuse irradiances. A controller can implememnt this model by continuously recording simultaneous measurements of illuminance, blinds' model has beend validated against a RADIANCE model of an office room, and a "toy" controller thant uses this model has been shown capable of keeping the horizontal work plane illuminance close to a given setpoint.

Official source

https://infoscience.epfl.ch/entities/publication/dc11299f-812b-40a2-bb5e-13a6e9107590

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2009
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/dc11299f-812b-40a2-bb5e-13a6e9107590

About this result

Related concepts (23)

Linear combination

In mathematics, a linear combination is an expression constructed from a set of terms by multiplying each term by a constant and adding the results (e.g. a linear combination of x and y would be any expression of the form ax + by, where a and b are constants). The concept of linear combinations is central to linear algebra and related fields of mathematics. Most of this article deals with linear combinations in the context of a vector space over a field, with some generalizations given at the end of the article.

Daylighting

Daylighting is the practice of placing windows, skylights, other openings, and reflective surfaces so that direct or indirect sunlight can provide effective internal lighting. Particular attention is given to daylighting while designing a building when the aim is to maximize visual comfort or to reduce energy use. Energy savings can be achieved from the reduced use of artificial (electric) lighting or from passive solar heating.

Illuminance

In photometry, illuminance is the total luminous flux incident on a surface, per unit area. It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception. Similarly, luminous emittance is the luminous flux per unit area emitted from a surface. Luminous emittance is also known as luminous exitance. In SI units illuminance is measured in lux (lx), or equivalently in lumens per square metre (lm·m−2).

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A fast daylight model suitable for embedded controllers

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