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Air streams are mixed to save energy and improve energy efficiency by partially recirculating conditioned air.. 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]
Plenums are the central distribution and collection units for an HVAC system. The return plenum carries the air from several large return grilles (vents) or bell mouths to a central air handler. The supply plenum directs air from the central unit to the rooms which the system is designed to heat or cool.
In all such cases, discovery, and repair of such problems to eliminate unintended plenums is difficult due to the hidden nature, limited space, and difficult access of most installed drop ceilings. For highest fire safety, it is best to assume all drop-ceiling and raised-floor airspaces are plenums, whether or not they are officially designated ...
Ravenswood No. 3, also known as Unit 30 or Big Allis, is a natural gas facility at Ravenswood Generating Station owned by LS Power and operated by IHI Corporation Energy Services. During 1963, Allis-Chalmers announced that ConEd had ordered the "world's first MILLION-KILOWATT unit...big enough to serve 3,000,000 people."
The magnitude and extent of the Arctic air will build into the first full week of January and linger through the middle of the month and will, at times, affect more than 250 million people living ...
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