No-frost Fin Evaporator for Household Electrical Appliances (refrigerator, Freezer)

No-frost Fin Evaporator

For Household Refrigerators & Freezers

This type of evaporator is the core component for no-frost / frost-free refrigeration appliances, using forced air circulation to achieve cooling without manual defrosting.

Basic Structure

Type: Fin-and-tube evaporator (lanced / corrugated fins for enhanced heat transfer)

Common material:

Full aluminum tube + aluminum fin (all-aluminum)

Or copper tube + aluminum fin (Cu-Al)

Connection: Mechanical expansion, tight tube-fin contact

With integrated defrost heater (electric heating tube / aluminum foil heater)

Equipped with temperature sensor / defrost sensor mounting position

Working Principle

Refrigerant evaporates inside the tube, absorbing heat

Fan forces indoor air to pass through the fin surface

Continuous heat exchange lowers cabinet temperature

Periodic automatic defrost melts frost on fins

Defrost water flows out through drain pipe

Main Performance Characteristics

No manual defrost required → fully automatic operation

Uniform temperature inside cabinet

Fast cooling, high heat exchange efficiency

Low airflow resistance, low fan noise

Compact structure, suitable for limited space in household fridges

Typical Application

Single-door, double-door, multi-door frost-free refrigerators

Upright frost-free freezers

Side-by-side / French door refrigerators

Small commercial display coolers used in household scenarios

Typical Technical Range (Reference)

Overall heat transfer coefficient K: 18–35 W/(m²·K)

Operating temperature: Refrigerated ~2–8 °C / Frozen ~-18 °C

Common refrigerants: R600a, R134a

Fin spacing: 4–8 mm

Tube diameter: φ7 mm, φ8 mm