Electronic expansion valve

expansion valve
Electronic expansion valve

The compressor and the electronic expansion valve (EEV) are integrated in a control loop. When the cold air requirement changes, the EEV takes on the task of precision adjustment by varying the degree of opening within a few seconds. If this precision control is no longer sufficient, the cooling capacity is adapted by way of the compressor speed. Due to the short control response times, the system always works in the optimum operating range, making it even more efficient.

Due to the quick adaptation of the valve to variable conditions, the downstream load on the refrigerant circuit is reduced:

  1. risk of liquid at compressor intake when speed is decreasing
  2. excessive overheating when speed is increasing.

The driver optimises valve opening in line with condenser pressure. Condensing temperature is reduced with further benefits in terms of power consumption.