Return air


Also found in: Acronyms.

Return air

The air that has circulated through a building as supply air and has been returned to the HVAC system for additional conditioning or release from the building, in order to reduce the energy that would be consumed by using only fresh air as a source.

return air

Air returned from an air-conditioned or refrigerated space to the central plant for processing and recirculation.
References in periodicals archive ?
The differential air temperature ([DELTA]T) between supply and return air is inversely related to how much airflow is required to remove some amount of heat.
The test AHU has both a supply air fan and return air fan, and both fans are equipped with variable-frequency drives (VFDs).
Hotter return air temperatures facilitate heat exchange within cooling systems, improving power usage effectiveness (PUE) and reducing energy costs through lower fan speeds, higher chilled water temperatures and greater economiser hours.
10) Install A Return Air Hopper Screen--As a minimum, there should be a screen in the return air (at the hopper) to insure that resin pellets don't leave the drying hopper.
In an office space, the return air would be around 80 degrees F.
Forum member "mdnyrx" hears a banging noise from a large rectangular return air duct when the furnace shuts off.
Emirates Islamic Bank and Dubai Bank, part of the Emirates NBD Group, will be giving away return air tickets to customers who avail personal finance of AED 75,000 and above.
Customers who buy any Nivea products worth QR20 from any Safari Group outlet in Qatar are eligible for a raffle draw for a return air ticket to their home country under the "Buy & Fly" offer.
Some knitting mills have installed expensive power guzzling solutions, such as return air systems, which has eventually proven to be partially effective against lint.
Three nights, four day JetEscape packages include return air travel with the airline, airport transfers, hotel accommodation, three day race ticket passes for the Zone 4 Walkabout stand and travel insurance.
Return flights to Berlin from Liverpool John Lennon 3 nights' B& B at the three-star Tulip Inn Frankfurter Tor hotel (the four-star Golden Tulip Berlin - Hotel Hamburg is available for a supplement) Return air port to hotel transfers Guided City Tour The services of a Tour Manager
A grand prize of a return air ticket to London awaits the champion at the end of the three-day event tomorrow.