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A Real-Time Numerical Analysis of Vehicle Cool-Down Performance
Published May 20, 2007 by Institution of Mechanical Engineers in United Kingdom
The cool-down performance of a passenger vehicle is affected by several components for instance the air-conditioning system itself, engine compartment and environmental thermal conditions. Therefore sufficient information is required at very early stage of design to ensure sufficient air conditioning performance for the passengers. In this study a robust numerical method for estimating vehicle cool-down performance developed recently is introduced. A full air-conditioning system was simulated by a commercial 1-D thermohydraulic analysis code, FLOWMASTER. Heat flux including solar radiation through the car structure was estimated by CFD simulation, using STARCD and a 3-D heat transfer program, THESEUS_FE v1.0. These programs were coupled together like a real air-conditioning system which shares boundaries between different systems. All thermal conditions were defined exactly with a Climate Wind Tunnel (CWT) used for developing a real car. It was found that this method provided results very similar to the test results during the entire simulation process.