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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| stability |
1. for a feedback control system or element, the
property such that its output is asymptotic, i.e., will ultimately attain a
steady state within the linear range and without continuing external stimuli.
For certain nonlinear systems or elements, the property such that the output
remains bounded, e.g., in a limit cycle of continued oscillation, when the
input is bounded. 2. (general) property of a
system or element by virtue of which its output will ultimately attain a steady
state |
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| stack |
1. portion of the exhaust system downstream of
the draft diverter, draft hood, or barometric draft regulator.
2. vertical train of a system of soil, waste, or
vent piping extending through one or more stories. 3. an organized set of
things fitting or resting one over another in a regular fashion |
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| stack effect (chimney effect) |
movement of air or
other gas in a vertical enclosure (e.g.,
duct, chimney, building), induced by the density difference between the air or
other gas in the enclosure and the ambient atmosphere. Note: Stack effect is a significant concern in heating system
design for tall buildings in cold climates. |
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| stacking density |
density to which a product
can be stacked, taking into account sufficient free space around the product
for proper cold air circulation |
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| stand alone system (energy) |
energy management
system that performs all control functions without direction from any other
unit. |
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| standard | in ASHRAE, a document that
defines properties, processes, dimensions, materials, relationships, concepts,
nomenclature, or test methods for rating purposes |
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| standard acceleration due to gravity |
32.174 ft/s2
(9.806 65 m/s2). |
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| standard conditions |
1. set of physical,
chemical, or other variables of a substance or system which defines an accepted
reference state or forms a basis for comparison |
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