Tunnel freezing typically requires evaporation temperatures of –35°C to –45°C, with faster product freezing being preferable. The evaporator must feature a large heat exchange area, high fin efficiency, and optimized refrigerant distribution. Tunnel freezing evaporators require high heat transfer capacity, high airflow, strong anti-frost capability, food-grade materials, and a reliable defrost system. They must also be compatible with multiple refrigerants and operate safely and stably in extreme low-temperature environments.

Not all evaporators are capable of tunnel freezing.
Only manufacturers with expertise in cryogenic processes, NH₃/CO₂ systems, and continuous production can truly deliver.