Induced draft air cooled heat exchangers pull air from below a fin tube bundle, through and around the fins then past the fan blades, exhausting above the unit.
In this design the fans are mounted above the fin tube bundle. The drive motor may be mounted above the fans where the cooling requirement is low and exhaust air will be relatively cool. In most cases the motors and drivetrain are mounted below the tube bundle. This limits the motors exposure to exhaust air exiting the top of the ACHE.
This increased exposure to hot exhaust air increases the maintenance requirement in comparison to forced draft heat exchangers. This addition wear is seen on drive gear, pulleys, fan blades, bearings and mounts where the motor is mounted underneath the finned tube bundle. It would be unusual to mount the motor above the fans in this style cooler but the additional heat would, in theory, reduce the operational life of a motor when mounted above the tube bundle.
The primary reason for choosing the induced design over the forced method of cooling is for additional control in unpredictable climates. Increased coverage of air flow across the tube bundle coupled with limited exposure above the bundle to the elements create additional cooling control. Induced draft heat exchangers also benefit from a longer service life in most cases due to this added protection from the weather.
- Even Cooling Distribution Over Tubed Bundle
- Stack Effect Delivers Inherent Cooling
- Highly Controllable For Precise Cooling
- Superior Protection From The Elements
- Reduced Noise When Using Silencers