Can a cooling tower be used without a chiller? This question often arises among engineers and industrial facility owners. To understand this, let’s start from the beginning. A cooling tower is a special building or structure designed to cool water through its contact with air. The name comes from the French word “graduer,” which means “to change gradually.” Initially, this term was used in chemistry to describe the process of gradual heating or cooling of substances.
The history of cooling towers began in the 19th century when industrial enterprises faced the need to cool large volumes of water. The first cooling towers appeared at metallurgical plants in England in the 1860s. They looked like wooden towers with latticed walls.
Today, cooling towers are used in power plants, chemical plants, and air conditioning systems of large buildings. Their operating principle is based on a simple physical phenomenon – the evaporation of water during contact with air. This allows reducing water temperature by several degrees.
How a cooling tower works and why it’s needed
Let’s look in detail at how a cooling tower without a chiller functions. Imagine a large tower with openings at the bottom and top. Hot water is supplied through sprayers at the top of the structure. Water droplets fall down through special nozzles that increase the contact area with air.
Physics of the cooling process
When water contacts air, two processes occur. First, heat transfer – hot water gives off heat to cooler air. Second, evaporation – part of the water turns into steam, taking away a significant amount of heat.
Interesting fact: evaporating one gram of water consumes about 540 calories of heat. That’s why even a small amount of evaporated water can significantly cool the main mass of liquid.
Types of cooling towers by design
There are several main types of cooling towers:
Tower type – tall structures with natural draft
Fan type – equipped with forced ventilation
Atmospheric – operate using wind
Each type has its advantages. Tower cooling towers don’t consume electricity for airflow creation but occupy more space. Fan types are more compact and efficient but require power supply.
Independent use of cooling towers in various industries
It turns out that a cooling tower without a chiller can be used in many situations. Let’s look at specific examples from different industries.
Metallurgical industry
In metallurgical plants, cooling towers cool water after continuous furnaces and rolling mills. Chillers aren’t needed here – natural water cooling from 60-70°C to 25-30°C is sufficient. This temperature is quite suitable for reuse in the technological process.
Example: At the Zaporizhzhia Iron Ore Plant, cooling towers operate with a capacity of up to 10 thousand cubic meters of water per hour without any chiller.
Energy facilities
Thermal power plants use cooling towers for steam condensation after turbines. Water heats up to 40-50°C and needs cooling to 20-25°C for return to the condenser. The cooling tower handles this task independently.
Chemical industry
In chemical plants, many processes are accompanied by heat release. Reaction vessels, distillation columns, heat exchangers – all require cooling. Cooling towers here work as part of a closed cooling circuit.
Interestingly, some chemical processes even benefit from such “soft” cooling. Sharp temperature changes can harm product quality, while gradual cooling in a tower provides stable results.
Practical Advantages of Working Without a Chiller
Many people think that a cooling tower without a chiller is some kind of imperfect solution. In reality, it’s quite the opposite. This approach has several advantages that make it attractive for many enterprises.
Economic Benefits
The first and most obvious advantage is cost savings. Chillers are expensive. An industrial chiller with a capacity of 1000 kW can cost from 50 to 100 thousand dollars. And you need to add installation, maintenance, and repair costs.
A cooling tower operates almost for free. The only costs are electricity for water supply pumps. For fan cooling towers, fan costs are added, but they are dozens of times lower than chiller consumption.
By the way, the payback period for a cooling tower is usually 2-3 years, while for a chiller, this figure can reach 7-10 years.
Design Simplicity and Reliability
A cooling tower is quite a simple structure. It has no complex compressors, condensers, or electronic control systems. Fewer parts mean fewer breakdowns. This is especially important for enterprises where downtime is expensive.
The average service life of a cooling tower is 20-30 years. Chillers usually work for 10-15 years before requiring major repairs or replacement.
Environmental Aspects
Cooling towers don’t use freons or other refrigerants that can pollute the environment. They work only with water and air — the cleanest substances on the planet.
They also consume almost no electricity. This means fewer CO2 emissions from power plants. For Ukraine, where environmental issues are becoming increasingly important, this is very significant.
Limitations and Operating Features
However, a cooling tower without a chiller has its limitations. Understanding these aspects will help properly assess the capabilities of such a system.
Temperature Limits
The main limitation is the temperature to which a cooling tower can cool. It cannot cool water below the wet-bulb temperature of the air. What does this mean?
Wet-bulb temperature is the lowest temperature to which water can be cooled by evaporation. During summer heat in Ukraine, it usually ranges from 18-22°C. This means the cooling tower cannot cool water below these values.
For many processes, this is quite sufficient. But if you need water with a temperature of 5-10°C, you’ll have to use a chiller.
Weather Dependency
Cooling tower efficiency heavily depends on weather. In humid weather, water evaporates poorly, so cooling becomes less effective. In winter, conversely, the cooling tower can cool water to very low temperatures.
In summer 2018, Europe experienced abnormal heat. Air temperature reached 40°C with high humidity. Under such conditions, cooling towers operated at only 60-70% of their usual efficiency.
Water Losses
Cooling towers lose water through evaporation. Usually, losses amount to 1-2% of the total circulating water volume for every 10°C of cooling. For large systems, this can be tons of water per day.
In regions with water scarcity, this can become a problem. Therefore, before installing a cooling tower, it’s necessary to calculate the water balance and provide a makeup water system.
Cooling towers without chillers are widely used in Ukrainian industry and energy sectors. They are economical, reliable, and environmentally safe. The main thing is to correctly calculate system parameters and consider climate and technological process specifics. Under these conditions, a cooling tower will become an effective solution for water cooling for many years.
Can a Cooling Tower be Used Without a Chiller?
Can a cooling tower be used without a chiller? This question often arises among engineers and industrial facility owners. To understand this, let’s start from the beginning. A cooling tower is a special building or structure designed to cool water through its contact with air. The name comes from the French word “graduer,” which means “to change gradually.” Initially, this term was used in chemistry to describe the process of gradual heating or cooling of substances.
The history of cooling towers began in the 19th century when industrial enterprises faced the need to cool large volumes of water. The first cooling towers appeared at metallurgical plants in England in the 1860s. They looked like wooden towers with latticed walls.
Today, cooling towers are used in power plants, chemical plants, and air conditioning systems of large buildings. Their operating principle is based on a simple physical phenomenon – the evaporation of water during contact with air. This allows reducing water temperature by several degrees.
How a cooling tower works and why it’s needed
Let’s look in detail at how a cooling tower without a chiller functions. Imagine a large tower with openings at the bottom and top. Hot water is supplied through sprayers at the top of the structure. Water droplets fall down through special nozzles that increase the contact area with air.
Physics of the cooling process
When water contacts air, two processes occur. First, heat transfer – hot water gives off heat to cooler air. Second, evaporation – part of the water turns into steam, taking away a significant amount of heat.
Interesting fact: evaporating one gram of water consumes about 540 calories of heat. That’s why even a small amount of evaporated water can significantly cool the main mass of liquid.
Types of cooling towers by design
There are several main types of cooling towers:
Each type has its advantages. Tower cooling towers don’t consume electricity for airflow creation but occupy more space. Fan types are more compact and efficient but require power supply.
To learn more about cooling systems, check out: How does a chiller with a cooling tower work?
Independent use of cooling towers in various industries
It turns out that a cooling tower without a chiller can be used in many situations. Let’s look at specific examples from different industries.
Metallurgical industry
In metallurgical plants, cooling towers cool water after continuous furnaces and rolling mills. Chillers aren’t needed here – natural water cooling from 60-70°C to 25-30°C is sufficient. This temperature is quite suitable for reuse in the technological process.
Example: At the Zaporizhzhia Iron Ore Plant, cooling towers operate with a capacity of up to 10 thousand cubic meters of water per hour without any chiller.
Energy facilities
Thermal power plants use cooling towers for steam condensation after turbines. Water heats up to 40-50°C and needs cooling to 20-25°C for return to the condenser. The cooling tower handles this task independently.
Chemical industry
In chemical plants, many processes are accompanied by heat release. Reaction vessels, distillation columns, heat exchangers – all require cooling. Cooling towers here work as part of a closed cooling circuit.
Interestingly, some chemical processes even benefit from such “soft” cooling. Sharp temperature changes can harm product quality, while gradual cooling in a tower provides stable results.
Practical Advantages of Working Without a Chiller
Many people think that a cooling tower without a chiller is some kind of imperfect solution. In reality, it’s quite the opposite. This approach has several advantages that make it attractive for many enterprises.
Economic Benefits
The first and most obvious advantage is cost savings. Chillers are expensive. An industrial chiller with a capacity of 1000 kW can cost from 50 to 100 thousand dollars. And you need to add installation, maintenance, and repair costs.
A cooling tower operates almost for free. The only costs are electricity for water supply pumps. For fan cooling towers, fan costs are added, but they are dozens of times lower than chiller consumption.
By the way, the payback period for a cooling tower is usually 2-3 years, while for a chiller, this figure can reach 7-10 years.
Design Simplicity and Reliability
A cooling tower is quite a simple structure. It has no complex compressors, condensers, or electronic control systems. Fewer parts mean fewer breakdowns. This is especially important for enterprises where downtime is expensive.
The average service life of a cooling tower is 20-30 years. Chillers usually work for 10-15 years before requiring major repairs or replacement.
Environmental Aspects
Cooling towers don’t use freons or other refrigerants that can pollute the environment. They work only with water and air — the cleanest substances on the planet.
They also consume almost no electricity. This means fewer CO2 emissions from power plants. For Ukraine, where environmental issues are becoming increasingly important, this is very significant.
Limitations and Operating Features
However, a cooling tower without a chiller has its limitations. Understanding these aspects will help properly assess the capabilities of such a system.
Temperature Limits
The main limitation is the temperature to which a cooling tower can cool. It cannot cool water below the wet-bulb temperature of the air. What does this mean?
Wet-bulb temperature is the lowest temperature to which water can be cooled by evaporation. During summer heat in Ukraine, it usually ranges from 18-22°C. This means the cooling tower cannot cool water below these values.
For many processes, this is quite sufficient. But if you need water with a temperature of 5-10°C, you’ll have to use a chiller.
Weather Dependency
Cooling tower efficiency heavily depends on weather. In humid weather, water evaporates poorly, so cooling becomes less effective. In winter, conversely, the cooling tower can cool water to very low temperatures.
In summer 2018, Europe experienced abnormal heat. Air temperature reached 40°C with high humidity. Under such conditions, cooling towers operated at only 60-70% of their usual efficiency.
Water Losses
Cooling towers lose water through evaporation. Usually, losses amount to 1-2% of the total circulating water volume for every 10°C of cooling. For large systems, this can be tons of water per day.
In regions with water scarcity, this can become a problem. Therefore, before installing a cooling tower, it’s necessary to calculate the water balance and provide a makeup water system.
Cooling towers without chillers are widely used in Ukrainian industry and energy sectors. They are economical, reliable, and environmentally safe. The main thing is to correctly calculate system parameters and consider climate and technological process specifics. Under these conditions, a cooling tower will become an effective solution for water cooling for many years.
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