Induced Draft Dry Fluid Cooler
What is an Induced Draft Dry Fluid Cooler?
An Induced Draft Dry Fluid Cooler is defined by the placement of its fan. In this design, the fan(s) are mounted on the discharge (exit) side of the heat exchanger coil. The fan pulls or induces air through the coil, creating a negative pressure (vacuum) across the entire finned-tube bundle.
This is in direct contrast to a Forced Draft cooler, where the fan pushes air through the coil from the intake side.
How It Works: The Induced Draft Principle
- Air Intake: Ambient air is drawn into the cooler from the intake side due to the suction created by the fan.
- Pulling Air Through the Coil: The fan, located at the exit point of the air path, acts like a vacuum, pulling air uniformly across the entire face of the heat exchanger coils.
- Heat Transfer: As the air is pulled across the fins, it absorbs heat from the process fluid inside the tubes (sensible heat transfer).
- High-Velocity Discharge: The now-warmed air passes through the fan and is discharged at a relatively high velocity out of the unit. This high exit velocity helps propel the exhaust plume away from the unit.