Closed Circuit Cooling Tower

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Closed Circuit Cooling Tower

An indirect, or closed circuit cooling tower involves no direct contact of the air and the fluid, usually water or a glycol mixture, being cooled. Unlike the open cooling tower, the indirect cooling tower has two separate fluid circuits. One is the external circuit,which cools the closed Circuit tube bundles by spraying cold water over them.And the closed circuit tube bundles carry the hot process liquid to be cooled. In operation the heat flows from the internal fluid circuit, through the tube walls of the coils, to the external circuit and then by heating of the air and evaporation of some of the water, to the atmosphere. Operation of the indirect cooling towers is therefore very similar to the open cooling tower with one exception. The process fluid being cooled is contained in a "closed" circuit and is not directly exposed to the atmosphere or the recirculated external water.

In a counter-flow cooling tower air travels upward through the fill or tube bundles, opposite to the downward motion of the water. In a cross-flow cooling tower air moves horizontally through the fill as the water moves downward.

Features of Closed Circuit Cooling Towers

We are specialized in manufacturing precision engineered Closed Circuit Cooling Towers that offer the following features:

The maintenance cost of cooling towers in the present or future is low.
Moving parts are placed in a unique way that they can be easily removed and repaired.
A unique controller for saving energy and protecting the environment in a closed cooling system.
Has a water level control system that maintains a constant level of water and also a wide base working platform to ease the tedious maintenance process.
Uniform water distribution system with large orifice nozzle to reduce clogging.
Specially designed axial air-foil fan blades for low noise levels and lower power consumption.
Highly efficient sprinkling pump to ensure low power consumption and low noise.
We have a wide base working platform to ease the tedious maintenance process.
We have a water level control system that maintains a constant level of water in the cooling tower basin.
Hot-dipped galvanized cooling tubes to avoid corrosion and maximize heat exchange with the cooling medium. For better conduction of heat, we also provide copper tubes instead of GI.

Principle of Closed circuit cooling towers

Closed circuit cooling towers operate in a manner similar to open cooling towers, except that the heat load to be rejected is transferred from the process fluid (the fluid being cooled) to the ambient air through a heat exchange coil. The coil serves to isolate the process fluid from the outside air, keeping it clean and contaminate free in a closed loop. This creates two separate fluid circuits: (1) an external circuit, in which spray water circulates over the coil and mixes with the outside air, and (2) an internal circuit, in which the process fluid circulates inside the coil. During operation, heat is transferred from the internal circuit, through the coil to the spray water, and then to the atmosphere as a portion of the water evaporates.

Maintenance of Closed circuit cooling towers

Since the process fluid of a closed loop system is completely isolated from the environment, routine maintenance is only required on the heat rejection equipment itself. The need to shut down the system periodically to clean the heat exchanger is dramatically reduced, if not entirely eliminated. Providing clean process fluid to the system will extend the life of other components in the system (condenser bundles, compressors, etc.).

Water Treatment

Maintaining proper process fluid quality in a system may involve several steps, such as chemical treatment, filtration equipment and the addition of clean make-up water.

A closed circuit cooling tower can provide the following advantages over an open cooling tower:

Lower volume of recirculating water to treat.
Process loop requires minimal treatment.
During periods of dry operation, the need for make-up water is eliminated.
Operational flexibility.
Closed circuit towers allow for the following modes of operation not possible with open towers:

Free cooling operation without the need for an intermediate heat exchanger: Chiller turned off.
Dry operation: Conserve water and treatment chemicals, prevent icing and plume.
Variable pumping: Closed condenser water loop allows for variable speed pumping to conserve energy.

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Closed Circuit Cooling Tower