Glossary
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The terms and definitions included
in this glossary were taken from "ASHRAE Terminology of Heating, Ventilation,
Air Conditioning & Refrigeration".
To access the complete glossary please
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| radial distance (chimney) |
shortest distance from receptor location to
centerline of the chimney outlet |
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| radiance |
total radiant flux emitted from a surface
through unit projected area by unit solid angle. It includes the self-emitted
radiation plus reflections from sources other than the object evaluated as
interpreted from the direction of measurement. The term intensity of radiation
is sometimes used as a synonym for radiance. See also radiosity. |
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| radiant |
adj. radiating rays of light; emitting or reflecting
beams of light; vividly shining; glowing; brilliant |
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| radiant flux () |
time rate of flow of radiant energy (watts). |
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| radiant flux density |
measure of radiant power per unit area flowing
across or onto a surface. (Also called irradiance). |
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| radiant reflectance (luminous reflectanc |
ratio of the reflected radiant (or luminous) flux
to the incident radiant (or luminous) flux. |
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| radiant temperature asymmetry | difference between the plane radiant temperature
of two opposite sides of a small plane element |
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| radiant transmittance (luminous transmit | ratio of the transmitted radiant (or luminous)
flux to the incident radiant flux.
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| radiation |
act or process of radiating, specifically the
process by which energy is emitted from molecules and atoms, owing primarily to
internal temperature change |
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| radiation angle factor (shape factor) | when the space above an element of surface is
partially occupied by a body exchanging radiant energy with the surface, the
angle factor represents the fraction of the angular field of view where energy
exchange is taking place |
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