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A plenum space is a part of a building that can facilitate air circulation for heating and air conditioning systems, by providing pathways for either heated/conditioned or return airflows, usually at greater than atmospheric pressure.
A plenum chamber is a pressurised housing containing a fluid (typically air) at positive pressure. One of its functions is to equalise pressure for more even distribution, compensating for irregular supply or demand.
Plenum supply air temperature rise is the increase of the conditioned air due to convective heat gain as it travels through the underfloor supply plenum from the plenum inlet to the floor diffusers. [16] This phenomenon is also named thermal decay.
Plenum may refer to: Plenum chamber, a chamber intended to contain air, gas, or liquid at positive pressure; Plenism, or Horror vacui the concept that "nature abhors a vacuum" Plenum (meeting), a meeting of a deliberative assembly in which all members are present; contrast with quorum; Plenum space, enclosed spaces (in buildings) used for airflow
Description: Example of a typical commercial building with the space above the drop-ceiling acting as an air-return plenum. If a fire were to start above the drop ceiling, toxic fumes would be drawn into the open-air system and potentially poison building occupants before they are aware of the fire.
The most common application for an air-mixing plenum is the mixing of return air (or extract air) with fresh air to provide a supply air mixture for onward distribution to the building or area which the ventilation system is serving. [1] The air transferred from the return air stream to the supply air stream is termed recirculated air.
The third plenum this week will help China better navigate complexities in global landscapes, advance its economic transformation, and enhance the people's "sense of gain", state media has cited ...
If the shaft is used for mine ventilation, a plenum space or casing is incorporated into the collar to ensure the proper flow of air into and out of the mine. Beneath the collar the part of the shaft which continues into the ground is called the shaft barrel. [citation needed]