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Glossary of terms used in energy efficient building design and assessment
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
CIE Overcast Sky Is the standard means of representing the luminance distribution of an overcast sky. It is an international standard (Commission Internationale de l'Eclairage) representing an idealistic situation and is sun position and azimuth angle independent. The distribution considers that the maximum luminance occurs at the zenith (directly above) reduces to one third of this value at the horizon. The luminance at an angle of elevation of Ø relative to the zenith luminance is 1/3 (1 + 2SinØ) Direct Evaporative Cooling an evaporative cooling technique in which humidified (and cooled) air is used for ventilation. Evaporative Cooling when heat from air is used to vaporise a water source thereby causing the air temperature to drop. Homeostasis maintenance of constant deep body temperature: regulated by hypothalamus helps to exactly balance energy input and output Illuminance Is a property of received light. It may be likened to a density or intensity. It is the light equivalent of irradiance (power/area) Luminance is a property of a light SOURCE. Note that any surface which receives light and reflects or transmits a proportion of light is a light source. Thus a window, for example, will have a luminance largely determined by the condition of the sky from which it receives its light Luminous Efficacy Luminous Flux is a property of emitted or received light. Thus a light bulb has a luminous flux: the total light output and a desk which receives light from this source will have a luminous flux representing the total light it receives Mean Radiant Temperature |
Glossary |