This driver allows one to study a fairly complex problem, that of the adaptation of a refrigeration machine to changes in the outside temperature or the compressor rotation speed.

In this example, the various components are coupled by non-linear equations:

First, pressure levels are set by the thermal equilibrium of two phase-change heat exchangers, the evaporator and condenser, which set the saturation temperatures;
The compressor sets the volumetric flow of refrigerant (depending on its rotation speed and compression ratio that determine its volumetric efficiency), and thus the mass flow rate (depending on the specific volume of refrigerant at the inlet).
The main parameters of the refrigeration machine, namely the pressure levels and flow-rate, are set by several components strongly coupled whose calculation cannot be done independently.

In addition, we set two additional constraints:

we take into account the pressure drops in heat exchangers;
sub-cooling is determined by ensuring the conservation of total mass of refrigerant contained in the machine.