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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| impeller backplate (impeller hub disc; i | disc rotating with the axle, to which the
impeller blades of a centrifugal fan are fixed |
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| impeller reaction |
ratio of the variation of the fluid pressure in
the impeller to the total variation of pressure in the device |
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| impeller running noise frequency | in a turbomachine, the noise frequency resulting
from the rotational speed of the impeller |
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| inch of water (inch water gage; inch wat |
in the I-P system, a unit of head equal to a
column of liquid water 1 inch high at 39.2°F.
inch-pound units |
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| indicated horsepower | horsepower absorbed as measured by means of an
indicator diagram |
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| indicated work |
work absorbed as measured by an indicator
diagram, independent of time |
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| indicator diagram (indicator card) |
pressure-volume diagram tracing a gas in a
compressor or engine cycle in terms of pressure and volume displaced. See also
volumetric efficiency |
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| indicator diagram reexpansion line |
curve on an indicator card representing the
pressure; the total volume relationship of clearance fluid during the initial
portion of the return stroke of the piston prior to the opening of the suction
valve |
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| indoor air quality (IAQ) |
attributes of the respirable atmosphere
(climate) inside a building including gaseous composition, humidity,
temperature, and contaminants. See also freshness index.
acceptable indoor air quality air in which there
are no known contaminants at harmful concentrations, as determined by cognizant
authorities, and with which a substantial majority (80% or more) of the people
exposed do not express dissatisfaction. See also sick-building syndrome. |
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| induction (entrainment) |
entrainment of room air by the jet action of a
primary airstream |
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