Air Amplifiers as explained this article below from 2018 are the most popular products used for cooling fr the reasons explained. One note to ad is that cooling can be accelerated by adding shims to open up the gap in Fixed Air Ampfliers like the FX series or like the Adjustable Air Amplifiers. The reason they work so well is that the high velocity of the air cuts through the boundary layer of the hot part removing the heat quickly. There is also some cooling effect from the compressed air as it leaves the amplifier and goes to atmospheric pressure creating a slight temperature drop. These products have even been used to “dehumidify” or remove moisture from surfaces as the blowing air absorbs surface moisture.
In many industrial applications compressed is or fans are used for cooling very hot parts. Compressed air will cool much faster than a fan and take up less space but will use more energy. This is important if the manufactured part is costly and improved throughput will improve profitability.
One way to reduce that energy cost significantly is to use air amplifiers or air movers. Air Amplifiers are generally sized from 3/4″ and up to 8″ in outlet diameters. The most common size for cooling is from the 1-1/4″ to 4″. This is because the larger the air amplifier the more efficient it is for “amplifying” the flow although small 3/4″ units are used to cool small parts. They work by drawing in atmospheric air from the back of, and into, and then through the air amplifier.
Some companies use air amplifying air nozzles – some which are made up to as much as 2″ in size. However they amplify air flow by drawing in from the front around the nozzle exhaust as opposed to through the unit. So they will not amplify as much, With less mass flow, they will use significantly more energy than an air amplifier and also produce more noise.
So when cooling very hot parts is necessary, consider using air amplifiers over air nozzles and over fans.
Nex Flow® Air Products are specialists in the use of compressed air for blow off, cooling, and moving and can assist in evaluating the optimum solution for cooling applications.