Function: In the evaporator of a refrigeration system, the tube bundle facilitates the absorption of heat from the surroundings or the product being cooled. Refrigerant, typically in a low-pressure, low-temperature state, flows through the tubes.

Function: In the condenser, the tube bundle facilitates the release of heat absorbed by the refrigerant during the cooling process. The high-pressure, high-temperature refrigerant gas flows through the tubes, and heat is transferred to the surrounding medium (air or water).