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Fluid Coolers

Fluid Cooler Features

Same Features as Condensers

  • Large Tube Diameters (1/2″ — 5/8″)
    • Smooth Tube Wall
  • Vent and Drain Rather than Schrader Valves
  • Fan Cycling & Speed Control Based on Leaving Fluid Temperature
  • MicroChannel Not Available

Water Cooler Condenser

  • High Ambient Temperature
  • Moderate Fluid Temperature
  • Moderate Fluid TD


  • Low Ambient Temperature
  • Low Fluid Temperature
  • Moderate Fluid TD


  • High Ambient Temperature
  • High Fluid Temperature
  • High Fluid TD

Fluid Cooler Characteristics

Average Fluid Temperature determines critical Fluid properties that affect pressure drop through the Fluid Cooler.

Temperature Differential (TD) is directly proportional to Fluid Cooler Capacity (BTUH) required.

Leaving Fluid Temperature is always higher than Ambient Air Temperature. The closer these values, the larger the Fluid Cooler needed.

Ambient Air Temperature defines the type of fluid needed. For Ambient Temperature below freezing, additives (typically glycol) are needed to prevent damage to the piping and components.

Fluid Cooler Specification

Minimum Requirements to Specify a Fluid Cooler

  • Fluid Characteristics
    • % Glycol
    • Propylene or Ethylene
  • Fluid Flow Rate (GPM)
  • Ambient Temperature
  • Entering Fluid Temperature
  • Leaving Fluid Temperature OR Capacity
  • Altitude Where the Unit Will Operate

Other Useful Information

  • Maximum Pressure Drop Through the Coil
  • Electrical Limitations
  • Noise Limitations
  • Fin Spacing Limitations