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 ?
"More than a 90-percent increase in return air tickets from abroad to Bratislava and Vienna is really unprecedented and there is no other explanation," said Jozef Rybar, PR manager of Pelikan, as quoted in a press release.When eliminating other factors, such as the overall increase in the number of travellers using air transport, the launch of new flight connections and various discounts, the growth represents tens of percent.
Properly designed, containment will allow you to duct hotter air to the CRAC units and the hotter return air temperatures allow the CRAC unit to operate more efficiently, closer to ARI ratings.
If the return air temperature is exceeding this level, then there is too much process air or too high a processing temperature.
(2) The outlet of the return air roadway is the pressure-outlet, with a differential pressure of -130 Pa; the outlet of the high suction roadway is the pressure-outlet, with a negative extrication pressure set as -13 kPa.
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.
On BioSafe[R] Cleanrooms, return air is directed to the HVAC unit via ducts inside the BioSafe[R] panels.
UNDER PS350 FLIGHTS: Netflights (0844 692 6792) offers Royal Brunei returns ex-Heathrow until December 5 from PS322, if booked by October 7; and return Air France/KLM flights to Jo'burg from PS484, ex-Heathrow with Air France/KLM until Mar 31, if booked by October 3.
Each holiday package is for two people and comes with two economy return air tickets, four-day/three-night accommodation in a five-star hotel besides a Dh15,000 shopping allowance.
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.