The evaporator for tunnel freezer could use Freon (R134a, R22, R404A) or ammonia (r-717),CO2 refrigerants.
Normally Freon evaporator's coils are made of copper tubes and aluminum fins.
Fin spacing 5, 8, 10 and 12 mm
Ammonir or co2 evaporator are made of stainless steel tube or galvanized steel tube and aluminum fins, fin space from 4mm to 20mm
Defrosting do have electronic elements, hot gases or water defrost.
We also provide special evaporators for tunnel freezer.
The selection of evaporator is based on temperature input/output and physical etiquette products needed for cold, insulation of refrigeration compartment, product storage temperature, daily turnover, number of open freezer doors, regime type (industrial, commercial), etc.
Good quality Plywood packing: