Daily Archives: June 30, 2025

In an air-cooled heat exchanger, or air cooler, heat is transferred from the process fluid to the cooling airstream via extended surfaces or finned tubes. While the performance of wet-cooling systems is dependent on the ambient wet bulb temperature, the performance of air-cooled heat exchangers is determined by the dry bulb temperature of the air....

There are more parameters to be considered in the thermal design of ACHEs than for shell and tube exchangers. ACHEs are subject to wide variety of constantly changing climatic conditions which pose problems of control not encountered with shell and tube exchangers. Designers must achieve an economic balance between the cost of electrical power for...

An ACHE consists of the following components One or more bundles of heat transfer surface. · An air-moving device, such as a fan, blower, or stack. · Unless it is natural draft, a driver and power transmission to mechanically rotate the fan or blower. · A plenum between the bundle or bundles and the air-moving […]

An ACHE is a device for rejecting heat from a fluid directly to ambient air. This is in contrast to rejecting heat to water and then rejecting it to air, as with a shell and tube heat exchanger and a wet cooling tower system.   The obvious advantage of an ACHE is that it does […]

The basic design procedure for air-cooled heat exchangers is similar to that for shell-and tube exchangers. An initial configuration for the unit is obtained using an approximate overall heat-transfer coefficient together with the design guidelines given above. An important preliminary step in the design process is the selection of the outlet air...