![]() On the other hand, the CFD model in this report is part of a coupled system simulation involving multiple 1-D or 3-D modeling components. ![]() This coupled method enables right-sizing HVAC systems against realistic transient operations instead of peak operations to reduce compressor load, thus to achieve overall fuel economy improvement. It demonstrates that the coupled method can simulate fully transient HVAC system operations in a vehicle. The coupled simulation consists of an A/C and an Air-Handling (HVAC module) system models, and a cabin CFD model. ![]() We then apply this integrated tool to simulate a transient A/C operating cycle including hot-soak and cool-down of a cabin. In this report, first, the implementation of this fully transient, coupled method between FLUENT CFD and e-Thermal is introduced. This toolset utilizes COM software interface standard of MS Windows for inter-process communication at simulation run-time to synchronize the two applications and to exchange data. A multidisciplinary toolset integrating ANSYS FLUENT CFD solver and GM in-house thermal system design tool - e-Thermal has been developed to design automotive HVAC systems.
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