Views: 0 Author: Site Editor Publish Time: 2026-07-15 Origin: Site
A bare tube evaporator is a refrigeration heat exchanger made of smooth, fin-free tubing coils (no attached metal fins). Liquid refrigerant boils inside the tubes, absorbing heat directly from surrounding air, liquid or product via only the tube’s outer bare surface to achieve cooling/freezing.
Construction & Materials
- Structure: Continuous bent tube bundles (zigzag, trombone, horizontal suspended or floor-standing layouts), with header manifolds for refrigerant inlet/outlet.
- Tube Materials by refrigerant & scenario:
- Copper: Small commercial units, HFC/HFO refrigerants
- Carbon steel / Stainless steel: Large industrial ammonia (NH₃), CO₂ systems, food & chemical hygiene environments
- Aluminum: Light-duty domestic fridges/freezers
Working Principle
1. Low-pressure liquid refrigerant flows into the bare tube bundle after the expansion valve.
2. The refrigerant vaporizes inside tubes, absorbing latent heat from air/media outside the tubes.
3. Cold tube surfaces cool the surrounding space; gaseous refrigerant returns to the compressor suction line to complete the cycle.
