Plenum ventilation in buildings - Revision history

Designing Buildings at 08:38, 25 September 2020

2020-09-25T08:38:34Z

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	Plenums are air compartments or chambers that are sometimes found in buildings, either above suspended ceilings, in the gap between the ceiling and the floor slab, or below raised floors in the gap between the raised floor and the floor slab. They form part of the ventilation system for the building.		Plenums are air compartments or chambers that are sometimes found in buildings, either above suspended ceilings, in the gap between the ceiling and the floor slab, or below raised floors in the gap between the raised floor and the floor slab. They form part of the ventilation system for the building.

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	* Ventilation.		* Ventilation.

−	[[Category:~~Products_/_components~~]] [[Category:DCN_Product_Knowledge]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:Products_/_components]]

Editor at 17:32, 22 September 2016

2016-09-22T17:32:11Z

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	* CIBSE Case Study Ortus Learning and Events Centre.		* CIBSE Case Study Ortus Learning and Events Centre.
	* Ground preconditioning of supply air.		* Ground preconditioning of supply air.
		+	* Herringbone strut.
	* HVAC.		* HVAC.
	* Floating floor.		* Floating floor.
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	* Ventilation.		* Ventilation.

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Editor at 14:11, 3 August 2016

2016-08-03T14:11:41Z

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	To help develop this article click ‘Edit this article’ above.		To help develop this article click ‘Edit this article’ above.

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	Plenums are air compartments or chambers that are sometimes found in buildings, either above suspended ceilings, in the gap between the ceiling and the floor slab, or below raised floors in the gap between the raised floor and the floor slab. They form part of the ventilation system for the building.		Plenums are air compartments or chambers that are sometimes found in buildings, either above suspended ceilings, in the gap between the ceiling and the floor slab, or below raised floors in the gap between the raised floor and the floor slab. They form part of the ventilation system for the building.

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	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===
−	*Active thermal mass.	+
−	*Air handling unit.	+	* Active thermal mass.
−	*Chilled beam.	+	* Air handling unit.
−	*CIBSE Case Study Olympic Velodrome.	+	* Chilled beam.
−	*CIBSE Case Study Ortus Learning and Events Centre.	+	* CIBSE Case Study Olympic Velodrome.
−	*Ground preconditioning of supply air.	+	* CIBSE Case Study Ortus Learning and Events Centre.
−	*HVAC.	+	* Ground preconditioning of supply air.
−	*Floating floor.	+	* HVAC.
−	*Mechanical ventilation.	+	* Floating floor.
−	*Night time purging.	+	* Floor plenum airtightness.
−	*Raised floor.	+	* Mechanical ventilation.
−	*Sprung floor.	+	* Night time purging.
−	*Suspended ceiling.	+	* Raised floor.
−	*Thermal labyrinth.~~<br/>~~	+	* Sprung floor.
−	*Thermal mass.~~<br/>~~	+	* Suspended ceiling.
−	*Underfloor air distribution	+	* Thermal labyrinth.
−	*Ventilation.	+	* Thermal mass.
		+	* Underfloor air distribution
		+	* Ventilation.

	[[Category:Products_/_components]]		[[Category:Products_/_components]]

Designing Buildings at 10:41, 11 September 2015

2015-09-11T10:41:55Z

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	*Night time purging.		*Night time purging.
	*Raised floor.		*Raised floor.
		+	*Sprung floor.
	*Suspended ceiling.		*Suspended ceiling.
	*Thermal labyrinth.<br/>		*Thermal labyrinth.<br/>

Designing Buildings at 08:31, 11 September 2015

2015-09-11T08:31:35Z

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	*Ground preconditioning of supply air.		*Ground preconditioning of supply air.
	*HVAC.		*HVAC.
		+	*Floating floor.
	*Mechanical ventilation.		*Mechanical ventilation.
	*Night time purging.		*Night time purging.

Designing Buildings at 09:55, 22 June 2015

2015-06-22T09:55:24Z

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	*Night time purging.		*Night time purging.
	*Raised floor.		*Raised floor.
−	*Thermal labyrinth.	+	*Suspended ceiling.
−	*Thermal mass.	+	*Thermal labyrinth.<br/>
		+	*Thermal mass.<br/>
	*Underfloor air distribution		*Underfloor air distribution
	*Ventilation.		*Ventilation.

	[[Category:Products_/_components]]		[[Category:Products_/_components]]

Designing Buildings at 17:48, 14 May 2015

2015-05-14T17:48:01Z

← Older revision		Revision as of 17:48, 14 May 2015
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	*Mechanical ventilation.		*Mechanical ventilation.
	*Night time purging.		*Night time purging.
		+	*Raised floor.
	*Thermal labyrinth.		*Thermal labyrinth.
	*Thermal mass.		*Thermal mass.

Designing Buildings: moved Plenum to Plenum ventilation in buildings

2014-11-20T07:27:54Z

moved Plenum to Plenum ventilation in buildings

← Older revision

Revision as of 07:27, 20 November 2014

Designing Buildings at 06:37, 12 November 2014

2014-11-12T06:37:31Z

← Older revision		Revision as of 06:37, 12 November 2014
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	Underfloor air distribution (UFAD) uses the underfloor plenum beneath a raised floor to provide ventilation air through floor diffusers directly to the occupied zone. The air spreads across the floor forming a reservoir of fresh, cool air. Any sources of heat (such as people or computers) generate a thermal plume lifting contaminated air to high level where it can be removed from the space. See Underfloor air distribution for more information.		Underfloor air distribution (UFAD) uses the underfloor plenum beneath a raised floor to provide ventilation air through floor diffusers directly to the occupied zone. The air spreads across the floor forming a reservoir of fresh, cool air. Any sources of heat (such as people or computers) generate a thermal plume lifting contaminated air to high level where it can be removed from the space. See Underfloor air distribution for more information.

−	Plenum can give good flexibility for the layout of ~~ventilation systems~~. However, they can provide a space within which fire can spread, particularly because of the air supply they offer, and so they may be required to include fire and smoke detection, and potentially combustible material (such as cables) may be controlled. They can also create a pathway for the transmission of sound between separate spaces.	+	Plenum can give good flexibility for the layout of buildings. However, they can provide a space within which fire can spread, particularly because of the air supply they offer, and so they may be required to include fire and smoke detection, and potentially combustible material (such as cables) may be controlled. They can also create a pathway for the transmission of sound between separate spaces.

	The inclusion of dampers and acoustic attenuators can be beneficial, but this results in pressure losses. Good air-tightness is required to the plenum construction to optimise performance.		The inclusion of dampers and acoustic attenuators can be beneficial, but this results in pressure losses. Good air-tightness is required to the plenum construction to optimise performance.

Designing Buildings: Created page with " To help develop this article click ‘Edit this article’ above. ---- Plenums are air compartments or chambers that are sometimes found in buildings, either above suspended c..."

2014-11-12T06:31:27Z

Created page with " To help develop this article click ‘Edit this article’ above. ---- Plenums are air compartments or chambers that are sometimes found in buildings, either above suspended c..."

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Plenums are air compartments or chambers that are sometimes found in buildings, either above suspended ceilings, in the gap between the ceiling and the floor slab, or below raised floors in the gap between the raised floor and the floor slab. They form part of the ventilation system for the building.

They may be supply or return plenum, and may serve either an entire building, or a specific zone in a building. Supply plenum supply ventilation air to the occupied space, whilst return air is generally extracted through ductwork. Conversely, in return plenum the air is generally ducted to the space, whilst the return air is extracted through the plenum.

Plenum can be combined with thermal mass to help moderate peak conditions, or to allow night time purging. See thermal mass for more information.

Underfloor air distribution (UFAD) uses the underfloor plenum beneath a raised floor to provide ventilation air through floor diffusers directly to the occupied zone. The air spreads across the floor forming a reservoir of fresh, cool air. Any sources of heat (such as people or computers) generate a thermal plume lifting contaminated air to high level where it can be removed from the space. See Underfloor air distribution for more information.

Plenum can give good flexibility for the layout of ventilation systems. However, they can provide a space within which fire can spread, particularly because of the air supply they offer, and so they may be required to include fire and smoke detection, and potentially combustible material (such as cables) may be controlled. They can also create a pathway for the transmission of sound between separate spaces.

The inclusion of dampers and acoustic attenuators can be beneficial, but this results in pressure losses. Good air-tightness is required to the plenum construction to optimise performance.

It is important to ensure that spaces above suspended ceilings and below raised floors do not inadvertently become plenum as a result of the disconnection of, or damage to ductwork.

NB the phrase ‘open plenum’ can be used to describe buildings in which there is no suspended ceiling, but instead the floor slab and services are exposed giving an ‘industrial’ look.

= Find out more =

=== Related articles on Designing Buildings Wiki ===
*Active thermal mass.
*Air handling unit.
*Chilled beam.
*CIBSE Case Study Olympic Velodrome.
*CIBSE Case Study Ortus Learning and Events Centre.
*Ground preconditioning of supply air.
*HVAC.
*Mechanical ventilation.
*Night time purging.
*Thermal labyrinth.
*Thermal mass.
*Underfloor air distribution
*Ventilation.

[[Category:Products_/_components]]