Cooling towers are heat removal equipment used in industrial facilities and HVAC applications to transfer accumulated heat from the system to the external environment. In water-based systems, they contribute to the continuity of the cooling cycle by helping to bring the water, whose temperature has risen, back to a reusable level.
The selection of a cooling tower is planned according to the required capacity, water quality, operating temperatures, environmental conditions, and the process structure of the facility. Open and closed-loop designs have different operating modes. The tower can be considered in conjunction with chiller units, production lines, power plants, and various other industrial cooling applications.
What is a cooling tower?
A cooling tower helps reduce the temperature of heated water from a process or air conditioning system before sending it back into the recirculation system. Heat removal primarily occurs through contact between water and air, with a small portion of the water evaporating.
When evaluating operating conditions, technical data such as inlet and return water temperatures, air flow rate, fan structure, and packing material are considered. This data plays a role in determining the system capacity and the appropriate tower structure for the plant’s operating conditions.
The tower may contain components such as a water distribution system, packing surface, fan, drip tray, and collection basin. While the placement of these parts varies depending on the design, the primary goal is to ensure controlled air-water contact necessary for heat transfer. Water flow rate and inlet and outlet temperatures are considered together when determining system capacity.
Cooling water quality is also crucial for tower performance. Since mineral accumulation, fouling, and biological formations can affect heat transfer, water conditioning, periodic inspection, and maintenance processes should be included in the operating plan.
Closed Type Cooling Tower
In closed-type cooling towers, the water or process fluid to be cooled is circulated in a closed circuit to minimize direct contact with the external environment. This structure helps to minimize the impact of external contaminants on the fluid in the circuit and maintain water quality within the system.
In open-type cooling systems, the circulating water is in direct contact with the airflow inside the tower. This contact between water and air allows heat to be transferred to the external environment. In these systems, water quality, sediment formation, and external contaminants must be considered during operation and maintenance.
| System type | Contact of process fluid with air | Basic usage approach |
| Open circuit cooling. | It makes direct contact. | Applications where water recirculation is suitable |
| Closed-Loop Cooling | It is kept in a closed circuit. | Processes where maintaining fluid cleanliness is important. |
A closed-loop design is not the only option for every project. The plant’s capacity, maintenance schedule, water quality, operating temperatures, and environmental conditions must all be considered together. Open-loop systems can also be preferred depending on process conditions and the plant’s cooling needs.
When choosing between different industrial cooling systems, factors such as capacity, water or fluid properties, maintenance requirements, water usage, installation area, and climate conditions are also taken into account. A closed-loop cooling structure can be considered in applications where it is desired to limit contact between the circulating fluid and the external environment.
Cooling Tower Working Principle
The hot water entering the cooling tower is distributed to the fill surface or circulated in a closed circuit, depending on the system type. Air movement created by fans supports heat transfer. In evaporative systems, the evaporation of a small portion of the water contributes to lowering the temperature of the circulating water.
How do cooling towers work? The system is based on the principle of transferring heat from the hot water to the outside environment with the help of air. In open-type towers, water and air are in direct contact, while in closed-type designs, the water or process fluid is circulated in a circuit separated from the outside environment.
| Stage | Operation |
| Hot water inlet | The heated water in the system reaches the tower. |
| Water distribution | Depending on the system type, water is distributed within the tower or circulated in a closed circuit. |
| Air movement | Fans create airflow within the tower. |
| Heat transfer | The working principle is based on the transfer of heat from the water to the external environment through air and evaporative cooling. |
| Return of chilled water | The water, whose temperature has been lowered, is sent back into the system. |
In power plants, production facilities, and large-scale mechanical systems, cooling tower capacity is determined according to the facility’s heat load. Flow rate, inlet and outlet temperatures, and ambient conditions are among the key data considered in system selection. Determining these values appropriately for the project helps in planning a system suitable for the cooling needs.
Cooling Tower Prices
Cooling tower prices can vary depending on the system’s technical specifications and project-specific needs. Capacity, open or closed-loop design, casing structure, heat transfer elements, fan-motor group, automation level, and project-specific equipment requirements can all be decisive factors in determining the cost.
When obtaining quotes for cooling tower needs, the required cooling capacity, water inlet and outlet temperatures, flow rate, installation area, and operating conditions of the facility should be clearly defined. This data is important for evaluating the system’s suitability for the project and comparing bids based on the same technical requirements.
Frequently Asked Questions
Cooling towers are heat removal equipment that helps transfer heat generated in industrial facilities and air conditioning systems to the external environment. They reduce the temperature of heated water, allowing it to be returned to the cooling cycle.
In a cooling tower, hot water is distributed within the system or circulated in a closed loop. Fans create airflow, and heat transfer between the water and air transfers heat from the water to the outside environment. In evaporative systems, the evaporation of a portion of the water also contributes to the cooling process.
In open-type cooling towers, water comes into direct contact with the air. In closed-type systems, the water or process fluid to be cooled is circulated within a closed circuit, limiting contact with the external environment. The choice of system depends on the plant’s process structure, water quality, and operating conditions.
Cooling tower prices can vary depending on the required capacity, whether the system is open or closed type, the casing and heat transfer elements, the fan-motor group, the level of automation, and project-specific equipment needs. A precise assessment requires determining the facility’s flow rate, temperature, and operating conditions.
For more detailed information about chiller cooling systems, you can contact Teknotek.
