Refrigeration Evaporator Unit

This D7.7E6 refrigeration evaporator unit is precision-engineered to address thermal stratification in medium-to-large walk-in architectures. Powered by dual high-efficiency 400 mm external rotor fans, it circulates a massive air volume of 7,800 m³/h with a commanding 10-meter horizontal air throw. Inside the core, specialized inner-grooved copper tubes are paired with window-cut, dual sine wave louvered fins featuring wavy borders. This structural configuration forces immediate airflow turbulence, dropping internal oil film thermal resistance and guaranteeing rapid pull-down times.

In demanding commercial holding rooms with frequent forklift traffic and bay loading, incoming humid air creates severe frost challenges. This unit tackles the problem directly with a wide 6mm (4 FPI) fin pitch layout combined with a staggered tube matrix. The spacing allows substantial ice accumulation without narrowing the structural air paths or dropping static pressure. This ensures the room maintains its targeted -18°C baseline efficiently while preventing premature compressor short-cycling.

Built to withstand continuous sub-zero dampness, the chassis is manufactured from high-tensile galvanized steel sheets treated with an anti-corrosive powder coat finish. The internal air drivers use two 180 W low-temperature motors equipped with IP55 waterproof protection and Class F insulation. To guarantee total field reliability, every coil assembly undergoes a strict 2.8 MPa clean air pressure test, providing leak-free compatibility with R404A, R507A, R23, R134a, and R22 refrigerants.