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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| P |
| Pages: «1 2 3 4 5 6 7 8 » |
| piping cross connection (nonpressure) |
in a piping system, a connection in which a pipe
carrying potable water is connected (or extended) below the overflow rim of a
receptacle (or in an environment) that is at atmospheric pressure and that
contains nonpotable fluid |
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| piston displacement (swept volume) |
volume displaced in one shaft revolution in a
reciprocating compressor; may be given for one piston or all pistons for total
displacement |
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| piston stroke |
length of travel (twice its crank radius). |
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| pitot tube |
small bore tube inserted perpendicular to a
flowing stream with its orifice facing the stream to measure total pressure. At
present, the term is often used for a double-tube instrument from which the flow
velocity can be calculated with one orifice facing the flowing stream to
register total pressure and the other perpendicular to the stream to register
static pressure. |
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| pitting |
formation of small depressions in a surface due
to sand blasting, mechanical gouging, acid etching, or corrosion. |
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| plane radiant temperature |
uniform temperature of an enclosure in which the
incident radiant flux on one side of a small plane element is the same as in
the existing environment. |
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| plastic |
any of various nonmetallic compounds,
synthetically produced (usually from organic compounds, by polymerization) that
can be molded into various forms, and hardened for commercial use. |
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| plenum chamber |
in an air distribution system, that part of the
casing, or an air chamber furnace, to or from which the air duct system
delivers conditioned air. |
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| plug |
1.
an external-thread pipe fitting that is inserted into the open end of an
internalthread fitting to seal the end of a pipe.
2.
sealing a hole in a vessel, such as a pipe or tank, by inserting material in
the hole and then securing it.
3. material used to plug the hole. |
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| PLV |
part-load value. |
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