A process chiller is a refrigeration unit designed to remove heat from an industrial process — injection moulding machines, laser cutting systems, chemical reactors, pharmaceutical manufacturing lines, food processing equipment — where precise temperature control directly affects product quality, equipment performance, or production efficiency.

An HVAC chiller is designed to cool the air or water distribution system inside a building — office blocks, hotels, hospitals, shopping centres — where the goal is occupant comfort rather than process precision.

The two types of chiller share the same basic refrigeration cycle, but differ significantly in temperature range, control precision, construction standards, and application requirements. Choosing the wrong type for your application leads to either underperformance or paying for capabilities you do not need.

This guide explains the key differences, how to select the right type, and which Geson chiller configurations are available for process cooling applications.

Process Chiller vs HVAC Chiller: Key Differences

Factor Process Chiller HVAC Chiller
Primary purpose Cool an industrial process or equipment Cool building air or water distribution system
Temperature range −45°C to +25°C (process-dependent) +5°C to +15°C (chilled water supply)
Temperature control precision ±0.5°C or tighter ±1–2°C typical
Cooling load variability Highly variable — follows process cycles Relatively stable — follows occupancy and weather
Operating hours Often 24/7 continuous operation Seasonal — reduced or stopped in winter
Coolant type Water, glycol-water, or process-specific fluids Chilled water (typically 6–12°C supply)
Construction standards Industrial grade — designed for harsh environments Commercial grade — designed for mechanical rooms
Capacity range 0.5TR to 500TR+ (process chillers), larger for central process systems 10TR to 4,500TR (central HVAC systems)
Response speed Fast — must respond quickly to process heat load changes Slower — building thermal mass buffers load changes
Typical installation Adjacent to process equipment, on production floor Roof, basement, or external plant room

What is a Process Chiller?

A process chiller is a dedicated refrigeration unit that maintains the temperature of a specific industrial process within a defined setpoint range. The process fluid — water, glycol-water, or another cooling medium — is circulated directly to the heat source: the barrel of an injection moulding machine, the cutting head of a laser, the jacket of a chemical reactor, or the platens of a rubber press.

Process chillers are characterised by:

  • Wide temperature range: Standard process chillers operate from −10°C to +25°C. Low-temperature process chillers extend down to −45°C. This is fundamentally different from HVAC chillers, which are designed only for the 6–12°C chilled water range.
  • Tight temperature control: Process quality in applications like injection moulding, laser cutting, and pharmaceutical manufacturing depends on maintaining coolant temperature within ±0.5°C or tighter. Process chillers use PLC-based controls with precision temperature sensors to achieve this.
  • Continuous duty design: Process chillers are built for 24/7 operation, 365 days per year. Components — compressors, pumps, heat exchangers — are selected and sized for continuous duty rather than the intermittent operation typical of HVAC systems.
  • Fast load response: Industrial processes generate heat in sharp bursts — an injection moulding cycle, a laser pulse sequence, a chemical exothermic reaction. Process chillers are designed to absorb and reject these rapid load changes without significant temperature deviation.

Process Chiller Applications by Industry

Industry Application Typical Setpoint Why Process Chiller?
Plastics — injection moulding Mould cooling, barrel cooling, hydraulic oil cooling +8°C to +20°C Cycle time and part quality depend on precise mould temperature
Plastics — extrusion / blow moulding Die cooling, take-off roll cooling, conveyor cooling +10°C to +25°C Product dimensional stability requires consistent cooling rate
Laser cutting & welding Laser resonator cooling, beam delivery cooling +20°C ±0.5°C Laser wavelength stability requires precise coolant temperature control
Medical & MRI equipment MRI magnet cooling, medical laser cooling +18°C to +22°C Equipment reliability and image quality depend on stable cooling
Pharmaceutical manufacturing Reactor cooling, API crystallisation, clean room cooling −10°C to +15°C GMP compliance requires validated, precise temperature control
Food & beverage processing Mixing vessel cooling, pasteurisation cooling, fermentation control −5°C to +10°C Food safety and product quality require precise temperature management
Chemical processing Reactor temperature control, solvent recovery cooling −20°C to +20°C Reaction control and safety require reliable, accurate cooling
Electronics & semiconductor Test chamber cooling, solder reflow cooling, PCB cooling +15°C to +25°C Component reliability testing requires stable controlled temperatures
Rubber & printing Roll cooling, ink cooling, press cooling +10°C to +20°C Product quality and press speed depend on consistent cooling
Metal processing — die casting Die temperature control, hydraulic system cooling +15°C to +30°C Die life and casting quality require controlled thermal management

How to Select a Process Chiller: Key Parameters

Specifying the wrong process chiller size or configuration is one of the most common mistakes in industrial cooling projects. Use these parameters to define your requirement before requesting a quotation:

  • Cooling capacity (TR or kW): Calculate the total heat load generated by the process. For injection moulding, this is typically 30–50% of the machine’s electrical input. For lasers, the chiller capacity should match the laser’s rated heat output. For chemical reactors, the heat of reaction must be calculated from the process chemistry. Always add a 20–25% safety margin to the calculated load.
  • Coolant supply temperature (°C): The temperature the chiller must maintain at the outlet. This is the most critical specification — it determines whether a standard or low-temperature chiller is required, and directly affects the chiller’s COP and energy consumption.
  • Coolant return temperature (°C): The temperature of the fluid returning from the process. The difference between supply and return temperature, multiplied by flow rate and specific heat, gives the actual heat load.
  • Coolant type: Water only (for setpoints above +5°C), or glycol-water mixture (for setpoints below +5°C). Specify glycol type (propylene for food/pharma, ethylene for industrial) and concentration.
  • Flow rate (L/min or m³/h): The volume flow required by the process equipment. Some equipment (lasers, MRI) specifies minimum flow rate for cooling circuit design.
  • Ambient conditions: Outdoor temperature range for air-cooled chillers. For indoor installations, room temperature. High ambient temperatures reduce air-cooled chiller capacity.
  • Power supply: Voltage, frequency, and phase. Geson chillers can be configured for 380V/50Hz, 460V/60Hz, and other voltages on request.

Geson Process Chiller Configurations

Geson has manufactured process chillers for industrial customers across more than 40 industries since 2004, with over 10,000 projects completed. All process chillers are factory-tested at full load before delivery, with test records provided as part of the delivery documentation.

  • Air-cooled scroll process chillers — 3TR to 50TR
    Setpoint range: −10°C to +25°C. Compact design for installation adjacent to process equipment. Suitable for injection moulding, laser cooling, electronics, and laboratory applications. R454B standard from 2024.
  • Air-cooled screw process chillers — 50TR to 630TR
    Setpoint range: −15°C to +10°C. For large-scale process cooling in chemical plants, pharmaceutical manufacturing, food processing, and multi-machine plastic moulding facilities.
  • Water-cooled scroll process chillers — 10TR to 100TR
    For indoor installations where heat rejection to a cooling tower is preferred. Higher efficiency than air-cooled in high ambient temperature environments.
  • Water-cooled screw process chillers — 50TR to 1,500TR
    For large central process cooling systems serving multiple production lines or entire manufacturing facilities.
  • Low-temperature process chillers — down to −45°C
    For pharmaceutical freeze drying, chemical processing at sub-zero temperatures, and specialty industrial applications. Contact Geson engineering for specifications.

All Geson process chillers include PLC touchscreen controller, RS-485/Ethernet communication interface, stainless steel options for food and pharmaceutical applications, and customisable voltage and refrigerant configuration.

Lead time: Standard configurations 15 working days. Custom configurations 25–35 working days.

Request a process chiller quotation → Provide your cooling load (TR or kW), setpoint temperature, coolant type, and ambient conditions. Our engineering team will respond with a formal specification and price within 24 hours.

Frequently Asked Questions about Process Chillers

What is a process chiller?

A process chiller is a refrigeration unit specifically designed to remove heat from an industrial process — such as injection moulding, laser cutting, chemical reactions, pharmaceutical manufacturing, or food processing. Unlike HVAC chillers, which maintain building comfort temperatures, process chillers operate across a wide temperature range (typically −45°C to +25°C) and provide precise temperature control (±0.5°C or tighter) to protect product quality and equipment performance.

What is the difference between a process chiller and an HVAC chiller?

The key differences are temperature range, control precision, and duty cycle. Process chillers operate from −45°C to +25°C and provide ±0.5°C control precision for continuous 24/7 industrial duty. HVAC chillers operate in the +6°C to +12°C chilled water range, provide ±1–2°C precision, and are designed for seasonal building comfort cooling. Using an HVAC chiller for process cooling typically results in inadequate temperature control and premature equipment failure due to the different duty cycle requirements.

What size process chiller do I need?

Process chiller sizing requires calculating the heat load generated by the process — this is not the same as the electrical input of the machine. For injection moulding machines, the process heat load is typically 30–50% of the machine’s rated electrical input. For lasers, use the laser’s rated heat output. Always add a 20–25% safety margin. Contact Geson’s engineering team with your machine specifications and we will calculate the required chiller capacity.

Can a process chiller use glycol?

Yes. For setpoint temperatures below +5°C, a glycol-water mixture is required to prevent freezing. Use propylene glycol for food, beverage, and pharmaceutical applications. Use ethylene glycol for purely industrial applications where food contact is not possible. Geson process chillers can be factory-configured for any glycol concentration — specify your setpoint temperature and we will recommend the correct glycol type and concentration.

What industries use process chillers?

Process chillers are used across plastics manufacturing (injection moulding, extrusion, blow moulding), laser and metal cutting, pharmaceutical manufacturing, food and beverage processing, chemical processing, electronics and semiconductor manufacturing, medical equipment (MRI, laser), rubber processing, printing, and die casting. Essentially any industrial process that generates heat and requires temperature control to maintain product quality or equipment performance.

What temperature can a process chiller achieve?

Standard Geson process chillers achieve setpoint temperatures from −10°C to +25°C. Low-temperature process chillers using cascade or two-stage refrigeration systems achieve down to −45°C. For applications requiring temperatures below −45°C, contact Geson engineering for a custom solution.

Does Geson manufacture process chillers?

Yes. Geson has manufactured process chillers since 2004, serving customers in over 40 industries across the Americas, Europe, Middle East, Africa, and Southeast Asia. Process chiller capacity range is 3TR to 4,500TR, in air-cooled and water-cooled configurations, with setpoint temperatures from −45°C to +25°C. All units are factory-tested before delivery. Contact our engineering team with your process cooling requirements for a quotation within 24 hours.

How long does a process chiller last?

A well-maintained Geson process chiller is designed for a minimum 40,000 hours of failure-free operation, equivalent to approximately 5 years of continuous 24/7 operation. With proper preventive maintenance — annual refrigerant checks, regular filter cleaning, glycol testing, and compressor oil monitoring — process chillers routinely operate for 15–20 years before major overhaul is required.

Related Resources