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
visit ASHRAE's Bookstore.
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| thermal anomalies | heat loss characteristics
of a structure that are not in accordance with intended design characteristics |
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| thermal boundary resistance (thermal con |
ratio of temperature
difference to heat flux across the boundary between two distinct media
(solid/solid or solid/fluid |
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| thermal break (breaker) |
nonconducting frame around
a door or window acting to retard heat flow |
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| thermal bridge | low thermal resistance
path connecting two surfaces |
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| thermal comfort | condition of mind which
expresses satisfaction with the thermal environment |
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| thermal conductance (C factor) |
time rate of steady-state
heat flow through unit area of a material or construction, induced by a unit
temperature difference between the body surfaces. Units of C are Btu/h·ft2·°F or W/(m2°K). Compare
thermal resistance |
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| thermal conduction (heat conduction) |
process of heat
transfer through a solid (in the absence of convection and radiation). |
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| thermal conductivity (k factor) |
time rate of
steady-state heat flow through unit thickness of unit area of a homogeneous
material, induced by a unit temperature gradient in a direction perpendicular
to that unit. Units of k are in
Btu·in/(h·ft2·°F), Btu·ft/(h·ft2·°F), or W/(m·K). Compare
thermal resistivity. See also thermal conductance. |
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| thermal conductor | material that transmits
heat by conduction |
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| thermal convection |
1. transfer of heat by a fluid moving by natural
variations in density (in the absence of conduction and radiation). 2. transfer of heat by the
movement of fluid |
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