One possibility to set a target temperature in the cabin for a fixed displacement compressors is to control the compressors RPM.
This example demonstrates how a subsystem including several calculation controllers can easily be added to an existing HVAC simulation system.
By adjusting the compressor RPM, the performance of the compressor is controlled. This controlling strategy is included in a subsystem which mainly consists of calculation controllers.
As a necessary input, the user has to define a required cabin temperature and the upper and lower limit for the compressor RPM. The calibration coefficient is a kind of RPM offset for the controller, used in each simulation time step.
If the average cabin temperature exceeds the upper temperature limit plus the temperature tolerance, the max. RPM of the compressor is used.
In all other cases the RPM is reduced or increased by the calibration coefficient. Due to the change of the RPM in each simulation time step, a smooth control characteristic is created.Usable from release: KULI 9.1-0.01