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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You can always search for terms. |
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| pollution |
destruction or impairment of the purity of the
environment. |
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| polytrope |
graphical line representing a polytropic
process. |
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| polytropic process |
one in which heat is being exchanged with the
surroundings, represented by the equation pvn
= constant (n is the polytropic
exponent). |
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| porthole (inspection window) |
small glazed opening in a partition which
enables inspection of an enclosure without having to enter it. |
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| positive heat supply |
heat supplied to a space by design or by heat
losses occurring from energy-consuming systems or components associated with
that space. |
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| postpurge operation |
operating a burner fan after flame shutdown. See
purge. |
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| potentiometer |
1.
instrument for measuring or comparing small electromotive forces, such as those
produced by thermocouples.
2.
instrument for comparing small electromotive forces, or for measuring small
electromotive forces, by comparison with a known electromotive force. Its
principal advantage is that during the measurement, no current flows through
the source of electromotive force.
3.
three-terminal rheostat, or a resistor with one or more adjustable sliding
contacts, that functions as an adjustable voltage divider. |
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| power |
time rate of doing work, usually expressed in
horse-power (kilowatts). See horsepower. |
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| power plant |
equipment and buildings used in the production
and generation of power; e.g., electricity and steam |
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| ppm |
parts per million. |
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