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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| overall thermal transfer value (OTTV) |
quantity of heat transferred per unit of
temperature difference into a building through its walls or roof, due to solar
heat gain and outdoor-indoor temperature difference |
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| overpressure | pressure in excess of the designed normal
operating range |
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| overshoot |
1.
condition in a control system where the controlled variable exceeds the desired
set point as a result of approaching that set point too quickly.
2.
amount of the overtravel of an indicator beyond its final steady deflection
when a new constant value of the measured quantity is suddenly applied to the
instrument. 3. excursion of the controlled variable beyond
the differential or proportional band |
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| owner’s representative |
person(s) authorized to function in the owner’s
interests in matters pertaining to execution of testing, adjusting, and
balancing of systems. |
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| ozone |
triatomic form of oxygen O3.
Sometimes used as an oxidant in air conditioning and as an odor eliminator in
cold storages or exhaust stacks. It is toxic in concentrations of 1 ppm and
higher. |
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