Air change


Also found in: Acronyms.

air change

[′er ‚chānj]
(engineering)
A measure of the movement of a given volume of air in or out of a building or room in a specified time period; usually expressed in cubic feet per minute.

Air change

The replacement of air contained within a room with an equivalent volume of fresh air.
References in periodicals archive ?
To improve the air change in top-floor apartments of buildings with roofceilings it is necessary to use either central or more flexible individual mechanical ventilation.
These analyses indicate that mini-environment cleanrooms can be operated at lower air change rates without significantly affecting the cleanliness level of the mini-environment chamber provided the lower cleanliness levels in the surrounding room are acceptable.
One way of improving the situation would be to increase the air change rate.
To provide a means for formally assessing this, a simple financial appraisal method is explored by considering a cost for each air change provided and a cost to treat each case of an infection.
Both air change effectiveness or contaminant removal effectiveness are frequently used to characterize ventilation effectiveness.
KEY WORDS: air change rate, air conditioning, infiltration rate, outdoor-to-indoor transport, ozone-derived products, total exposure.
The calculations performed show how much the propagating uncertainty in value of building envelopes thermal resistance, air change rates, casual gains and indoor temperature influences the calculation output.
Learning from experience gained on the Martial Rose Library in Winchester, FCBA again adopted a hollow core displacement ventilation strategy: a system that responds well to the most onerous conditions during winter months, when maximum occupancy levels demand high air change targets without throwing away the free heat benefit that computers and people provide.
The five minutes during which chairs flew through the air change nothing.