In a real cooling package the air is not always guided through sealed shrouds, so there exist several leakages.
With KULI it is possible to model such leakages and even recirculation paths.
This example is based on the Tutorial Example ExTruck.
It shows how to model a leakage and a recirculation path such that the ratio of the air mass flow through radiator / inlet grid varies for different operating points between 70% – 130%.
The leakage is modeled via an area resistance below the main cooling package and the recirculation path is regulated via a second built in resistance.
The advantage of this modeling is that there is used the same cp-value and the same built-in-resistance for several operating points.Usable from release: KULI 9.1-0.01