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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| fan casing (volute, scroll) | part of the casing of a centrifugal fan or
compressor that receives fluid forced outward from the impeller or diffuser and
leads it to the discharge. Compare fan shroud |
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| fan coil unit (fan convector unit) |
fan and a heat exchanger for heating and/or
cooling assembled within a common casing. |
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| fan free-discharge area | area where the fan chamber meets the discharge
scroll. Used in fan system effect calculations |
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| fan inlet (outlet) area | area of the fan or fan equipment fitting
provided for connection to attached ductwork |
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| fan performance curve (constant speed pe | graphical representation of static or total
pressure and power input over a range of air volume flow rate at a stated inlet
density and fan speed. It may include static and mechanical efficiency curves |
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| fan power |
power input at the fan shaft, or the total of
the power input to the fan shaft and the power loss attributable to the power
transmission device. |
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| feedback |
1. returning of a fraction of the output to the
input.
2.
measurement of an output signal and feeding it back as an input to modify the
output. |
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| feeder (electric) |
main distribution line, usually three-phase,
supplying electric energy within an electric service area or subarea. |
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| fenestration |
1. in an external wall of a building, any area
which allows light to pass.
2.
commonly used to refer to any opening, usually glazed, in a building envelope;
windows. |
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| fenestration elements |
1. framing, mullions, muntins, and dividers.
2. glazing material, either glass or plastic.
3. external shading devices.
4. internal shading devices. 5. integral (between-glass) shading systems |
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