Closed Circuit Cooling Tower

1. Introduction

Closed cooling tower is a kind of closed cooler, which is used in manufacturing industry. The equipment that needs water for cooling is very common. The traditional water cooling method consumes a lot of water, and the maintenance cost of operating and using equipment is high. The working fluid of the cooling tower circulates in a closed way, and a circular tube with high heat exchange efficiency is used as a heat conductor to exchange heat through air. The remarkable characteristics of using closed cooling tower are stable circulating water quality, high heat exchange efficiency and low operating cost.

2. Cooling Tower Working Principle

The rapid evaporation of water film on the outer surface of the tube is mainly relied on to strengthen the heat transfer outside the tube, so as to achieve the purpose of softening water in the cooling tube. This is mainly because water has a high latent heat of vaporization (the latent heat of vaporization of water at one atmosphere is 570kal/kg), which greatly improves the overall heat transfer efficiency. When the equipment is running, the evaporation of the water film on the outer surface of the pipe makes the humidity of the air greatly increase after passing through the tube bundle, which is close to saturation. The axial flow fan draws the wet air away and makes it pass through the mist compensator located above the water spraying system, and removes the water droplets entrained in the wet air and then discharges it into the atmosphere from the air inlet. Because the axial flow fan is located at the upper part of the equipment, a negative pressure area is formed at the lower part of the axial flow fan when air is sucked upward, which accelerates the evaporation of water film on the outer surface of the pipe, so the heat transfer outside the pipe is strengthened.

3. Advantage

Save water by 50% compared with open cooling tower

Save 10% electricity than open cooling tower.

Reduce the amount of sewage by 50%

Simple maintenance and low maintenance cost.

Closed circulation, water quality is not polluted.

Constant cooling water temperature

The effect of saving water and electricity is remarkable.

Wide application range

Anti-clogging and anti-corrosion

4. Application

◆ Cooling of circulating water of various reactors and condensers in chemical industry;

◆ Cooling of industrial solution. Such as quenching solution, electroplating solution, etc.

◆ Cooling of metal die-casting molds, injection molds and other large molds. It is widely used in air conditioning cooling, refrigeration and plastic chemical industry;

◆ Cooling of large motors, diesel engines, rectification equipment, electric welding equipment, hydraulic stations and continuous casting equipment;

◆ Media that need closed recycling and pollute the environment;

◆ Medium with large cooling range;

Closed Circuit Cooling Tower vs Open Circuit Cooling Tower

When selecting an hvac system cooling tower, one of the most important decisions is choosing between a closed circuit cooling tower and an open circuit cooling tower. Both types of air conditioning cooling towers are widely used, but they differ significantly in structure, efficiency, and application scenarios.

A closed circuit cooling tower operates with a coil-based heat exchanger that keeps the process fluid completely enclosed. The fluid flows inside the coil, while spray water flows over the outside surface and air is drawn through the system. Heat is transferred indirectly from the internal fluid to the external air, without direct contact. This design ensures that the process fluid remains clean and free from contamination.

Longxuan closed circuit cooling towers are engineered with high-efficiency heat exchange coils and optimized airflow systems. The spray distribution is designed to be uniform, which improves thermal performance and reduces energy consumption. In addition, Longxuan uses corrosion-resistant materials such as FRP and galvanized steel to ensure long service life and stable operation. These advantages make Longxuan closed circuit cooling towers especially suitable for industries that require high water quality, such as data centers, manufacturing plants, and precision cooling systems.

In contrast, an open circuit cooling tower uses direct contact between water and air. Warm water is distributed over fill media, and as air passes through, part of the water evaporates and removes heat. This direct cooling method provides high efficiency and lower initial cost, which makes open circuit systems common in standard cooling tower HVAC systems.

However, open circuit cooling towers expose the circulating water to the environment, which can lead to scaling, biological growth, and contamination. As a result, they require more frequent maintenance and water treatment. Over time, this can increase operational costs and affect system reliability.

From a performance and maintenance perspective, closed circuit systems offer better protection and long-term stability, while open circuit systems provide a more economical solution for less demanding applications. For businesses that prioritize efficiency, durability, and clean operation, choosing a Longxuan closed circuit ac cooling tower is a reliable solution for modern cooling tower HVAC systems.

Closed Circuit Cooling Tower Diagram

Closed Circuit Cooling Tower Design

The closed circuit cooling tower design is widely used in modern HVAC systems where efficiency, cleanliness, and long-term reliability are essential. Unlike open systems, a closed circuit cooling tower uses a coil-based heat exchanger that keeps the process fluid completely isolated from external air. This indirect heat exchange structure significantly reduces the risk of contamination, scaling, and corrosion, making it ideal for industrial and commercial cooling applications.

In a typical hvac system cooling tower, the design includes three key components: the internal fluid coil, the external spray water system, and the airflow section. Warm process fluid circulates inside the coil, while spray water flows over the coil surface to enhance heat transfer. At the same time, air is drawn through the tower, carrying away heat through evaporation. This coordinated design ensures stable thermal performance even under high cooling loads.

Longxuan closed circuit cooling tower design focuses on improving both thermal efficiency and operational stability. One of its core advantages is the high-efficiency coil structure, which is engineered to maximize heat exchange surface area while minimizing flow resistance. This helps improve cooling performance while reducing energy consumption in cooling tower HVAC systems.

Another key advantage of Longxuan design is its optimized airflow distribution system. By ensuring uniform air intake and spray coverage, the system avoids dry spots on the coil surface and improves overall heat transfer efficiency. This results in more consistent cooling performance across different operating conditions.

In addition, Longxuan uses corrosion-resistant materials such as FRP and high-grade galvanized steel to extend equipment lifespan. This makes its air conditioning cooling towers suitable for harsh environments, including industrial plants, data centers, and heavy-duty cooling applications.

Maintenance is also simplified in Longxuan systems. The enclosed loop design reduces fouling and scaling, which lowers cleaning frequency and operating costs over time. Combined with energy-saving fan systems and intelligent control options, Longxuan closed circuit cooling tower design delivers a highly efficient and reliable solution for modern cooling tower ac units.

Overall, Longxuan’s engineering approach enhances every aspect of the closed circuit cooling tower design, making it a strong choice for businesses seeking performance, durability, and long-term energy savings.