March 6 - 8, 2017 | Berlin
LEADING ENGINEERING SIMULATION CONFERENCE
A CFD method of a virtual HVAC (Heating, Ventilation and Air Conditioning) rig has been developed by FS Dynamics on behalf of the HVAC calibration team at Volvo Car Corporation.
The main purpose of the virtual HVAC rig were to investigate the possibility of producing a significant amount of measurement data in a similar way as the HVAC calibration team receives the data from physical tests today. Furthermore an advantage of the virtual HVAC rig is the possibility of running it in different driving conditions within the same CFD model, reducing the need of doing physical tests in several different rig installations. Beyond the compilation of HVAC calibration data, the CFD method also includes flow visualization possibilities inside the HVAC system and the passenger compartment for further understanding of flow related problems and design considerations.
A key parameter to successfully run the virtual HVAC rig method in an efficient way is the automated java script which makes it possible to run a test sequence in an automated, controlled and robust way. For example it controls the overset mesh technique used on the 14 different rotatable flaps, the fan interface to simulate the pressure rise over the fan for a lot of different fan speeds and the heat exchanger combined with the variable temperature curtains which are controlled by baffles.
The virtual HVAC rig method was finally implemented in an on-going project where the shortage of time and other circumstances did not allow physical testing. This resulted in a successful delivery of HVAC calibration data and flow visualization inside the passenger compartment.