Closed Circuit Cooling Tower

Introduction

Closed circuit cooling towers provide evaporative cooling for many types of systems, and the specific application will largely determine which BAC Closed Circuit Cooling Tower is best suited for a project. This isolates the process fluid from the outside air, keeping it clean and free of contamination in a closed loop and creating 2 separate fluid circuits:

1. An external circuit, in which spray water circulates over the coil and mixes with the outside air.
2. An internal circuit, in which the process fluid circulates inside the coil.

Operation

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.

Advantages of Closed Circuit Cooling Towers

Closed circuit cooling towers completely isolate the process cooling fluid from the atmosphere. This is accomplished by combining the heat rejection equipment with a heat exchanger in a closed circuit tower. A closed loop system protects the quality of the process fluid, reduces system maintenance, and provides operational flexibility at a slightly higher initial cost.

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

Maintenance

• 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.).

Types of Closed Circuit Cooling Tower

• Combined Flow
• Counter Flow

Our Closed Circuit Cooling System gives completely rated thermal presentation, which also by yourself verified over special types of flow and high temperature requirements. Closed Circuit Cooling Towers are high efficiency and water saving.

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