What Is an Industrial Process Chiller?

2026-02-27

If your application requires an industrial chiller, you need to know some of the basics, which allows you to utilize it in a better way. This article describes the concepts, principles, types, components, and applications of chillers. Keep reading!

What is a Process Chiller?

A process chiller is a cooling device.It can help you moves heat away from the area you need to cool. It is often used in a variety of processes that require precise temperature control.

Why Industrial Processes Need Precise Cooling？

If your process is very sensitive to temperature, such as chemical reactions, semiconductor processes, etc., then you may need a chiller to help you accurately control the temperature.

Many devices will generate heat after continuous operation. In order to prevent the equipment from being damaged due to overheating, you need a chiller system to help cool it down.

How Does a Chiller Work?

The chiller uses refrigerant to absorb the heat of the secondary coolant, which then exchanges heat with other processes. This process needs the cooperation of the compressor, condenser, expansion valve, and evaporator to complete.

The compressor compresses the gaseous refrigerant. It can increase the pressure and temperature of the refrigerant. At the condenser, the hot refrigerant exchanges heat with the outside world (water or air), and it becomes a liquid.

The expansion valve passage is very narrow. When passing through the expansion valve, refrigerant will go from a small space into a wide space. This will reduce the pressure and temperature of the refrigerant.

The low-temperature liquid refrigerant will absorb heat and evaporate at the evaporator. Finally, the gaseous refrigerant will return to the compressor and circulate. This is the refrigeration cycle.

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Key Technical Parameters of Industrial Chillers

When purchasing a chiller, you will encounter many technical terms. Understanding the meaning behind these terms and parameters can help you select equipment that best matches your process requirements. Below are some common parameters.

Temperature range
The temperature range indicates the maximum and minimum operating temperatures that a unit can achieve. For example, if a unit has a temperature range of -40°C to 100°C, it means the highest temperature of the circulating fluid it can deliver is 100°C and the lowest is -40°C. The setpoint of the outlet temperature must be within this range.
Cooling capacity
Cooling capacity represents the unit’s ability to remove heat. It is affected by factors such as the type of circulating fluid, heat exchanger design, and flow rate. If the cooling capacity of the selected unit is lower than the actual heat load, it will be difficult to reduce the process temperature to the target value. The required cooling capacity must be calculated based on your specific operating conditions.
Refrigerant types
A refrigerant is the working medium that circulates inside the chiller. It removes process heat by absorbing heat during evaporation and releasing heat during condensation. Different refrigerants have different thermodynamic properties, which affect the cooling capacity, operating pressure range, achievable temperature range, and system safety. In addition, many countries and regions have environmental regulations governing the use of refrigerants.
Control accuracy
You may often see specifications such as ±0.1°C in chiller brochures. This refers to the temperature control accuracy of the unit. ±0.1°C means the temperature fluctuation of the outlet circulating fluid can be controlled within ±0.1°C. For processes and equipment that are sensitive to temperature variation, higher control accuracy is preferred.
Cooling method
The cooling method refers to how a process chiller rejects heat from the condenser to the external environment. There are two types: air-cooled and water-cooled. Air-cooled units use fans to move ambient air across the condenser to dissipate heat into the air. Water-cooled units use cooling water to remove heat from the condenser, and this method requires connection to a cooling tower system.

Chillers Components

The key components of a process chiller include a compressor, condenser, expansion valve and evaporator. In actual use, we will add other components.

Compressor

Compressor: The gaseous refrigerant compressed by the compressor will have a higher temperature and pressure. Common compressors include centrifugal, scroll and screw types.

Condenser

The condenser can cool the compressed refrigerant gas to liquid state. The commonly used condensation methods of air-cooled and water-cooled chillers are different. Air-cooled chillers use fans to blow air to cool down, while water-cooled chillers use cooling water from a cooling tower.

Expansion Valve

The passage of the expansion valve is very narrow, and the pressure and temperature of the liquid refrigerant flowing through the expansion valve will be changed by it. Common expansion valves include electronic expansion valves (EEV)and thermal expansion valves (TXV).

Evaporator

The heat exchange process takes place in the evaporator, where the liquid refrigerant absorbs the heat transferred by the refrigerant and evaporates into gas.

Types of Industrial Chillers

By Condenser Type

Chillers can be classified into water-cooled and air-cooled types based on the condenser used. Water-cooled chillers use water to absorb the heat of high-temperature refrigerant, so they are generally equipped with water towers, water pumps and pipes. Their overall footprint is often relatively large, but their cooling efficiency is very high.

Fans can cool the temperature of the refrigerant down. It relies on a suitable temperature environment. If the ambient temperature is high, its efficiency will be reduced.

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By Compressor Type

According to the type of compressor used, chillers can be divided into screw chillers, scroll chillers, and centrifugal chillers. This chiller uses a screw compressor. It uses a screw rotor to compress the refrigerant. There are two types: water-cooled and air-cooled. They have a large size ,and usually use in large industrial sites.

The scroll chiller uses a scroll compressor, which has two scrolls, a dynamic scroll and a static scroll. It is very small and is often used in small and medium-sized places.

Centrifugal generate centrifugal force by rotating at high speed. They have high speed and power .They are used in some places where require large-scale refrigeration.

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Chiller Applications

Chillers are widely used across various industrial processes. Here are some common application scenarios:

Laser Cutting

After continuous operation, the laser and the work head of the laser cutting machine will generate a lot of heat. If the equipment cannot be cooled in time, the equipment will be damaged due to thermal stress, resulting in expensive repair or replacement costs.

Injection Molding

In order to cool the mold quickly and improve the demoulding efficiency of the product and the consistency of the finished product batches, chillers are often used in the injection molding process to control the temperature of the mold.

Semiconductor Testing

In order to test the performance of semiconductor components under different extreme temperatures, manufacturers usually use semiconductor chillers to provide a constant temperature environment.

Chemical Reactions

In order to create the right ambient temperature for different chemical reactions, the researchers used a combination of a chiller and a jacketed reactor.

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FAQs

The operating temperature of a chiller depends on the unit model and refrigeration system design. Standard industrial chillers typically operate within a temperature range of -5°C to 30°C, which is suitable for most process and equipment cooling applications.

Some low-temperature models can reach -40°C or -60°C. Chillers using cascade refrigeration systems and low-temperature refrigerants can achieve -80°C or even -120°C. Heating and cooling integrated units have a wider temperature range, with maximum temperatures reaching 200°C or even 300°C in certain configurations.

The main difference between air-cooled and water-cooled chillers lies in the condenser cooling method. Water-cooled chillers remove heat through a cooling water circulation system. Air-cooled chillers use fans to circulate ambient air across the condenser to dissipate heat.

Air-cooled systems do not require a cooling tower and are easier to install, but their performance is more affected by ambient temperature, and cooling efficiency decreases in high-temperature conditions. Water-cooled systems have higher initial installation costs, but they provide higher cooling efficiency and are suitable for applications with large cooling capacity requirements.

Common refrigerants used in industrial chillers include R134a, R410A, R404A, and R407C. The specific refrigerant used depends on the required temperature range, compressor type, and local environmental regulations. In recent years, the use of low-GWP refrigerants has increased, but most industrial chillers still use conventional HFC refrigerants.

The service life of a chiller depends on system design, component quality, operating conditions, and maintenance frequency. Most chillers operate for 10 to 15 years. Some well-maintained units can operate for more than 20 years.

Routine maintenance of a chiller includes regularly cleaning the condenser and fan coils, checking fluid level, pressure, water quality, electrical connections, and operating current, replacing wear components, and calibrating the temperature control system.

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