Air Curtain


Also found in: Dictionary, Acronyms, Wikipedia.

air curtain

[′er ‚kərt·ən]
(mechanical engineering)
A stream of high-velocity temperature-controlled air which is directed downward across an opening; it excludes insects, exterior drafts, and so forth, prevents the transfer of heat across it, and permits air-conditioning of a space with an open entrance.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Air Curtain

 

a device in a local forced ventilation system for preventing the entry of cold outside air into an industrial space through open doors (or gateways) in industrial and commercial buildings. It consists of ducts with linear slots through which air is delivered by a fan with a velocity of 8-20 m/sec at an angle of 30°-45° to the face of the opening, against the stream of air tending to penetrate into the premises. Air curtains are also used at the enclosure openings of industrial equipment (to prevent the escape of hot, contaminated air into a room space) and in other cases where it is necessary to block off a current of air through an opening. The air supplied by the fan is often preheated; this type of unit (when used with an air preheater) is called a heated air curtain.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

air curtain

air curtain or air door
A stream of high-velocity temperature-controlled air which is directed downward, across an opening; excludes insects, exterior drafts, etc.; prevents the transfer of heat across it, and makes it possible to air-condition a space having an open entrance; used in exterior doors, on loading platforms, etc.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
The optimized construction of the covers enables easy cleaning for the air curtain and it does not require the disassembly of any part, always ensuring hygienic operation.
* When the air curtain is off (not operating), the doors are considered single doors (therefore, the flow resistance model of single doors is applied when the air curtain is off.
For designs that include air curtains, they are generally created using a couple of linear slot diffusers with supply plenums, which, similarly, are designed to deliver air evenly over the length of the air slot.
By using two complete units, they could test two different groups of air curtains at the same time.
However, flow field visualization tests showed that when more than one air curtain was operating, the curtain closest to the dissemination room showed some instability.
The HCR Model NPAC "Negative Pressure Air Curtain", which has special fluctuating air pressure detecting instruments, is currently in use at all existing Wal-Mart specialty distribution centers.
Based on similar experiences following Hurricane Andrew, the engineering consultant supplied technical specifications on the operation of refractory type air curtain burners and air quality test results.
Airbloc, which is part of NORTEK GLOBAL HVAC, says it supplied an air curtain from its AC Chassis range and the electrically heated CMS1000HE12-SM unit delivers a powerful downflow of heated air to create comfortable conditions for customers and it is a highly energy-efficient HVAC solution, typically reducing, heat loss around an open door by up to 80%.
has introduced the Walk-In Cooler Efficiency Kit, an easy-installation air curtain and control package combination that helps retailers comply with new energy code mandates for existing and new walk-in coolers.
For the horizontal refrigerated display cases, the simulation by Cui and Wang (2004) is the only one that is in line with measured temperature profile at the outlet of the air curtain. For the vertical refrigerated display cases, unfortunately, none of the existing literatures can provide a quantitative agreement with the experimental data.