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Evaporative Cooling Towers

Closed-circuit evaporative cooling towers designed for efficient process-fluid cooling, combining indirect heat transfer, corrosion-resistant construction and energy-efficient induced-draft airflow.
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Introduction

Atcorp offers evaporative coil cooling tower solutions for applications where process fluids need to be cooled without direct contact with atmospheric water. The closed-circuit design circulates process fluid through internal coils while evaporative water flows over the coil surface, allowing heat to transfer efficiently while keeping the process fluid isolated from the cooling water. (gemindia.com

Key Benefits

Closed-Circuit Cooling
Corrosion-Resistant Construction
Low Operating Noise
Efficient Heat Transfer
Lightweight Casing
Energy-Efficient Fans

Why Choose Evaporative Cooling Towers?

Conventional open cooling towers expose the circulating process water directly to the atmosphere, which can introduce contaminants and increase water-treatment requirements. An evaporative coil cooling tower uses a closed circuit: the process fluid flows through heat-transfer coils while a separate water circuit evaporates externally over the coil. This provides effective heat rejection while maintaining separation between the process fluid and cooling water. (gemindia.com)
Specification Details
Tower Type Closed-Circuit Cooler
Cooling Principle Evaporative Heat Rejection
Airflow Design Induced Draft
Airflow Direction Counterflow
Process Fluid Circuit Closed Coil Circuit
Tower Casing FRP
Supporting Structure Hot-Dip Galvanized Steel
Fill Material Rigid PVC
Fill Design Honeycomb
Fill Flute Height 6 / 12 / 19 mm
Fill Sheet Thickness 1.0 / 1.2 mm
Fan Type Induced-Draft Axial
Fan Pitch Adjustable
Fan Materials Plastic / FRP / Aluminium Alloy
Fan Motor Totally Enclosed Weatherproof
Motor Mounting Adjustable Base Inside Fan Stack
Inspection Access Inspection Doors
Process Cooling Indirect / Closed Circuit
Water Distribution Sprinkler / Nozzle System
Drift Control Drift Eliminator
Maintenance Access Lift-Out Strainer & Sump Access

An evaporative coil cooling tower removes heat from the process fluid through an indirect evaporative cooling cycle.

 

Step 1 – Process Fluid Circulation
The hot process fluid enters the closed cooling coil inside the tower.

 

Step 2 – Water Distribution
Cooling water is distributed over the outside surface of the coil.

 

Step 3 – Airflow Generation
The induced-draft axial fan draws atmospheric air upward through the tower.

 

Step 4 – Heat Transfer
Heat moves from the process fluid through the coil wall into the cascading cooling water.

 

Step 5 – Evaporation
A small portion of the cooling water evaporates, carrying heat away with the moist air.

 

Step 6 – Atmospheric Heat Rejection
Warm, moisture-laden air is discharged from the top of the tower.

 

Step 7 – Process Fluid Cooling
The cooled process fluid exits the coil and returns to the connected industrial process.

 

Step 8 – Continuous Operation
The cycle repeats continuously to maintain the required process-fluid temperature.

Closed-Circuit Process Cooling

The process fluid remains inside the coil, reducing direct exposure to atmospheric contaminants and evaporative water.

 

Efficient Evaporative Heat Transfer

The combination of water cascading over the coil and upward airflow provides effective heat rejection through evaporation.

 

Induced-Draft Counterflow Design

Air moves upward while water moves downward, creating an efficient counterflow heat-transfer arrangement. 

 

FRP Corrosion-Resistant Casing

The fiberglass-reinforced polyester casing is lightweight, corrosion-resistant and does not require painting. 

 

Robust Structural Frame

Hot-dip galvanized steel supporting structures help minimize rust and corrosion while providing long-term structural strength. 

 

Energy-Efficient Airflow

Induced-draft axial fans with adjustable pitch are designed for efficient airflow with low operating noise. 

 

High-Surface-Area Fill

Honeycomb PVC fill divides the air and water streams into multiple paths, increasing contact time and supporting heat transfer.

 

Easy Maintenance Access

Inspection doors provide access for internal inspection, float-valve adjustment, strainer cleaning and sump flushing

Structure

  • Hot-dip galvanized steel supporting frame
  • Corrosion-resistant construction
  • Designed for long-term industrial service

 

Casing

  • Fiberglass Reinforced Polyester (FRP)
  • Lightweight construction
  • Corrosion resistant
  • No painting required
  • Easy assembly

 

Air Distribution

  • Induced-draft axial fan
  • Adjustable-pitch fan blades
  • Dynamically balanced fan
  • Low-noise operation
  • Corrosion-resistant fan material options
  • Totally enclosed weatherproof motor
  • Adjustable motor base

 

Water Distribution

  • Sprinkler distribution system
  • SCSP nozzles
  • PVC honeycomb fill
  • Drift eliminator
  • Lift-out strainer
  • Accessible sump

 

Fill Options

  • 6 mm flute height
  • 12 mm flute height
  • 19 mm flute height
  • 1.0 mm sheet thickness
  • 1.2 mm sheet thickness

Industrial Applications

Evaporative coil cooling towers are suited to industrial processes requiring efficient heat rejection while keeping the process fluid isolated within a closed circuit.
Process Cooling
Provides indirect cooling for industrial process fluids where contamination control is important.
Chemical Processing
Supports heat rejection for suitable chemical processes requiring closed-circuit cooling.
Pharmaceutical Manufacturing
Helps maintain controlled process-fluid temperatures where fluid cleanliness and separation are important.
Food Processing
Provides indirect cooling for suitable food and beverage process applications.
Industrial Heat Exchangers
Provides an alternative cooling arrangement where direct open-loop cooling is undesirable.

Frequently Asked Questions

Find answers about evaporative coil cooling towers, closed-circuit cooling, operating principles, construction, maintenance and industrial applications.
An evaporative coil cooling tower is a closed-circuit cooling system in which the process fluid flows through internal coils while separate cooling water cascades over the coil surface. Heat is transferred through the coil and rejected through evaporation.
In a closed-circuit cooling tower, the process fluid remains contained inside the heat-transfer coil rather than being directly exposed to the atmosphere. This helps isolate the process fluid from the evaporative cooling-water circuit.
Hot process fluid flows through the coil while water is distributed over the outside of the coil. An induced-draft fan draws air upward through the tower. A portion of the water evaporates, carrying heat into the atmosphere and cooling the process fluid inside the coil.
The referenced ECT design uses an induced-draft counterflow arrangement, with air moving upward while cooling water cascades downward over the coil.
Selection should consider process-fluid flow rate, inlet and required outlet temperature, ambient wet-bulb temperature, heat load, fluid characteristics and available installation space. Atcorp can evaluate these parameters to help identify a suitable cooling tower configuration.
Yes. Atcorp can help Indian industrial customers evaluate their process cooling requirements and source a suitable closed-circuit evaporative coil cooling tower solution, including application-specific sizing and system requirements.

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