Streamline 
A freezer is only one part of a complete industrial freezing installation. The refrigeration system supplying the required cooling capacity is equally important.
For food manufacturers investing in industrial freezing equipment, the choice of refrigerant and refrigeration package can affect system design, energy use, maintenance and long-term operating costs.
Two refrigerants frequently considered in industrial applications are ammonia, also known as R717, and carbon dioxide, known as R744.
Both can be used in industrial refrigeration, but their characteristics and technical requirements differ.
What is an industrial refrigeration package unit?
A refrigeration package unit brings together several components required for a cooling process.
Depending on the system, these may include compressors, pressure vessels, heat exchangers, valves, controls and associated equipment.
Some packages are installed within a machinery room, while others are designed as containerised installations.
The complete design depends on the required temperatures, cooling capacity and application.
For a food processor buying a used freezer, it is important to understand whether the existing refrigeration package can be reused or whether a separate installation will be necessary.
Ammonia refrigeration in food processing
Ammonia has been used in large-scale industrial refrigeration for many years.
It offers favourable thermodynamic properties and is widely applied in food processing, cold storage and industrial freezing.
However, ammonia is toxic and requires appropriate safety systems, operating procedures and trained personnel.
The design must comply with the applicable regulations and standards.
When considering used ammonia equipment, buyers should assess its mechanical condition, refrigerant circuit, documentation and suitability for the proposed installation.
CO2 refrigeration systems
Carbon dioxide is another refrigerant used in industrial and commercial cooling applications.
CO2 systems can offer environmental advantages because the refrigerant has a very low direct global warming potential compared with many synthetic refrigerants.
However, CO2 refrigeration equipment operates under different pressure conditions from many conventional systems.
This places particular requirements on components, controls, safety devices and installation procedures.
A used CO2 package must be assessed carefully to determine whether it is suitable for the intended duty.
Does one refrigerant always perform better?
No. The best choice depends on the complete refrigeration design.
Operating temperatures, ambient conditions, energy efficiency, available infrastructure and maintenance capabilities all influence the decision.
Ammonia and CO2 can also be used in different system configurations, including certain cascade arrangements.
It would therefore be misleading to recommend one refrigerant solely on the basis of its name.
A qualified refrigeration engineer should evaluate the full technical and regulatory requirements.
What to inspect when purchasing used equipment
A used refrigeration package should be reviewed as a complete technical installation.
Relevant information includes the compressor specifications, refrigerant type, cooling capacity, operating pressures, control system and maintenance history.
The condition of pressure-containing components and the availability of technical documentation are particularly important.
Buyers should also check whether the equipment can be integrated with their existing utilities and production processes.
Industrial Freezing supplies used industrial refrigeration equipment, including compressor systems and related components.
Matching the package to the freezer
A refrigeration package must provide adequate cooling capacity at the required operating conditions.
A system that performs well in one facility may not deliver the same results in another environment.
Differences in evaporating temperature, condenser conditions, control strategy and heat load can all affect performance.
Therefore, the refrigeration package and freezing equipment should be evaluated together rather than as unrelated purchases.
Finding suitable refrigeration equipment
Purchasing a used industrial refrigeration package can be an attractive option when technical suitability and condition are properly verified.
Explore the available refrigeration equipment or contact Industrial Freezing to discuss the requirements of your food freezing installation.
A well-matched refrigeration system is essential for achieving reliable performance throughout the production process.
