plenum

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plenum

[′plen·əm]
(engineering)
A condition in which air pressure within an enclosed space is greater than that in the outside atmosphere.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Plenum

The air space in an integrated ceiling, which may be above the atmospheric pressure if used for the air supply, or below the atmospheric pressure if used for the air exhaust.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Plenum

 

a meeting of the entire membership of the elected ruling organ of an organization, such as a party, state, or labor organization.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

plenum

1. In suspended ceiling construction, the space between the suspended ceiling and the main structure above.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

plenum

In a building, the space between the real ceiling and the dropped ceiling, which is often used as an air duct for heating and air conditioning. It is also filled with electrical, telephone and network wires. See plenum cable.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
Potential Flow Models (PFMs), which compute airflow everywhere in the plenum just like more sophisticated types of CFD, can be employed to account for more plenum-airflow physics than FNM (VanGilder et al., 2011).
An option with a discharge flange like Option C is also possible but it is not likely to be cost effective because the pressure drop of the oversized plenum is already low.
This paper details a numerical simulation approach that can be extended beyond the cutoff frequency for inlet and outlet ducts as well as plenums. The approach meets an important need since the plane wave cutoff frequency is quite low for duct and plenum systems.
Though not obvious in its relation to the use of cables within plenum spaces, notes were introduced into several articles related to cables in plenums in the 2005 NEC.
A fifth, Variable Plenums, design, used a different diameter for the distributor and collector for each channel, the dimensions of which were optimized using the 1-D model.
* Are there wires in the risers or plenums that are not being used?
'An architect must be a provider of services, builder of peace and an occasional nay-sayer,' declared Frei Otto, introducing the plenum on 'Innovation and Tradition'.
They also called for signing an agreement between the Inter University Conference and the Ministry of Education and Science that would guarantee the participation of the Student Plenum in the drafting of the new law, that working groups be formed in which students and professors would be equitably represented, and that a timeframe be defined for developing the first and second draft of the new law.
In addition to achieving the levels of drying demanded, these plenums achieved it without the need for alterations to the block filler, plus more safely and at a much lower cost than the previously tried compressed air alternative.
Underwriters Laboratories (UL) then developed a standardized test that allowed this cable option to be approved and adopted by the NEC--known today as the "plenum cable test." Although plenum cables have always been more expensive than standard riser-rated PVC insulated cables, they cost significantly less than having to install cables in metal conduit.
Underfloor air-distribution system typically refers to an HVAC system that delivers conditioning air from an air-handling unit through an access floor plenum to multiple floor-located diffusers or terminals that modulate airflow to individual zones to maintain comfort.
The bill was given a go-ahead three hours after midnight on Saturday even though the Professor and Student Plenums had insisted that the procedure be halted and that the contention legislation be withdrawn.