Evaporator Core: Description and Operation

Purpose
The evaporator serves for cooling, dehumidifying and cleaning the passenger compartment air. The expansion valve is screwed directly onto the evaporator.


Function
The liquid refrigerant is injected into the evaporator under high pressure. Evaporators from the manufacturers Behr and Valeo are installed.

Behr: Plate-type evaporator of brazed half-plates with corrugated fins (model 210).

Behr: Conventional layout consisting of banks of tubes and louvers (model 170.)

Valeo: Conventional layout consisting of banks of tubes and louvers.

The heat required for evaporation is absorbed from the air flowing past the evaporator cooling the air. The fins or louvers provide a large evaporator surface ensuring quicker heat exchange.

The moisture condensing out of the air as it cools is drained outside through condensed water drain hoses. In addition the solid particles are removed from the air by the condensing water purifying the air.