Cooling Tower

A cooling tower is a heat rejection device that rejects waste heat to the atmosphere through the cooling of a water stream to a lower temperature. Cooling towers may either use the evaporation of water to remove process heat and cool the working fluid to near the wet-bulb air temperature or, in the case of closed circuit dry cooling towers, rely solely on air to cool the working fluid to near the dry bulb air temperature.

Types

With respect to drawing air through the tower, there are three types of cooling towers

  • Natural Draft - Utilizes buoyancy via a tall chimney

  • Mechanical Draft - Uses power-driven fan motors to force or draw air through the tower

    1. Induced draft  — A mechanical draft tower with a fan at the discharge at the top
    2. Forced draft  — A mechanical draft tower with a blower type fan at the intake

  • Fan assisted natural draft  - A hybrid type that appears like a natural draft setup, though airflow is assisted by a fan

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