This example shows how to find a suitable compressor ratio with the help of parameter variation and a stop controller.
The task of this example is to find the lowest compressor rpm that meets the desired performance results. In this example we assume that the task is to find the compressor rpm such that the evaporator air outlet temperature is at or below 5 °C. Since in reality sometimes only a limited number of distinct ratios between engine rpm and compressor rpm is available, parameter variation is used. In addition a stop controller is applied such that the parameter variation stops as soon as the first suitable solution is found. This avoids the unnecessary calculation of operating points when the solution has already been found. It is important to run the parameter variation with increasing ratio such that the first solution that fulfills the stop criterion is really the solution with the lowest possible compressor rpm.Usable from release: KULI 11