heliodon


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heliodon

A device used to orient a light source (representing the sun) with respect to an architectural model; calibrated in terms of latitude, time of day, and season of the year; used to study daylighting techniques and to illustrate the shadows cast by direct sunlight.
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Figures 1a and 1b and 2a and 2b show the south wall of the house at noon during the winter (21 December) and summer (June 21) solstices of the house model on the heliodon and the actual house, respectively.
They comprise an environmental laboratory containing a wind tunnel, artificial sky and heliodon, which is the most advanced of its kind in the UK and provides a unique facility for simulating wind and sun effects and is used for environmental scale modelling.
The author has developed a new kind of heliodon, called the Sun Emulator, which is especially useful for both the initial teaching of solar geometry and for the actual design of buildings and communities that are in harmony with the sun.