CO₂ Evaporator Coil Upgrade for A Supermarket Walk-In Cooler

With the global transition toward low-GWP and environmentally responsible refrigeration systems, CO₂ (R744) evaporator coils are increasingly adopted in walk-in coolers for food retail, cold storage, and food processing facilities. Designed specifically for the thermodynamic characteristics of CO₂, these evaporator coils provide reliable cooling performance while meeting stringent sustainability and regulatory requirements.

Design Features of CO₂ Evaporator Coils

Our CO₂ evaporator coils for walk-in coolers are engineered to handle both subcritical and transcritical CO₂ systems, with a strong focus on durability and performance:

• High-strength copper or stainless steel tubes, designed for elevated operating pressures

• Optimized fin geometry, ensuring uniform airflow and efficient frost management

• Precision circuiting, tailored for CO₂ mass flow and evaporation characteristics

• Compact footprint, maximizing storage space inside the walk-in cooler

• Optional corrosion-resistant coatings, extending service life in humid or aggressive environments

These design features ensure stable operation across medium- and low-temperature walk-in cooler applications.

Typical Applications

CO₂ evaporator coils are widely used in:

• Supermarket and convenience store walk-in coolers

• Food distribution and cold logistics centers

• Meat, dairy, and seafood storage rooms

• Pharmaceutical and laboratory cold rooms

We supplied a custom-designed CO₂ evaporator coil compatible with the store’s transcritical CO₂ refrigeration system. The coil was engineered for high operating pressure, optimized airflow, and minimal temperature fluctuation. An optional anti-corrosion coating was applied to improve durability under high humidity conditions.

Results

• Stable room temperature maintained at +2°C to +4°C

• Improved cooling response during peak load periods

• Reduced refrigerant environmental impact with near-zero GWP

• Lower maintenance requirements due to robust coil construction

• Enhanced system reliability and compliance with future regulations

Conclusion

CO₂ evaporator coils are a key component in modern, sustainable walk-in cooler refrigeration systems. By combining high-efficiency heat transfer, pressure-resistant design, and optional protective coatings, these coils deliver reliable performance while supporting environmental compliance and long-term cost control.