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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| sight glass |
transparent tube
or window (bull’s eye) used to indicate the liquid level in a boiler, tank,
bearing, and similar fluid-containing equipment. |
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| signal converter |
device that changes one
set of codes, modes, sequences, or frequencies to a different set |
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| silencer | device or unit installed
in air duct systems to control air noise in the duct, or to control discharge
noise |
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| slab on ground floor | floor of concrete
constructed on the ground |
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| slime | visible and tangible
mucous layer of microbial colonies spread over a surface. |
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| slip |
1. phenomenon of a fluid slipping past a fixed
surface with a finite velocity. A no-slip condition pertains to a boundary
condition in a fluid flow problem where the slip velocity is assumed to be
zero. 2. difference between the
speed of rotation of a motor and the rotational speed of the alternating
current. See also two-phase flow |
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| sludge |
product of
decomposition of oil resulting from impurities, moisture, or chemical reactions
and favored by excessive temperature. Sludge may be mushy, gummy, or hard. |
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| slugging |
effect produced by
droplets of liquid refrigerant or oil, or a mixture of both that reach the cylinder
of a compressor. |
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| slurry |
suspension of a solid in a
liquid. See ice slurry |
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| smudging |
black marks on ceilings
and air outlets, generally caused by dirt particles suspended in the room air.
This dirt is entrained in the mixed airstream and is deposited on the ceiling
and outlet |
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