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To increase the comfort level of a vehicle cabin, vehicles today are equipped with rear cooling unit in addition to the primary heating ventilation and air conditioning (HVAC) system that supplies conditioned air into the cabin through the instrument panel (IP) duct and console or foot duct. Ducting for the rear unit is generally provided through C or D pillar and the roof of the vehicle. Owing to packaging and styling constraints, flow induced noise in roof duct has become a key parameter in design and development of the rear cooling unit. This paper, broadly discusses: Two Broadband Noise Source (BNS) Models namely (i) Proudman’s model for quadrupole source and (ii) Curle’s boundary layer model for dipole source and Ffowcs-Williams & Hawkings (FW-H) model for noise level information at receiver location.

Investigation of fluid flow for three different modes of operation of an automotive heating ventilation and air conditioning (HVAC) system is carried out in the present work. The modes considered are: face mode, defroster mode and foot mode. The performance of the HVAC system is judged by parameters like air discharge rate at cabin level, pressure drop through the system, uniformity of the air flow at the outlet faces and distribution between different duct outlets. All these parameters are predicted by Computational Fluid Dynamics (CFD) analysis. Multiple reference frame (MRF) model is used to simulate the steady state flow through the rotating blower. Porous medium model is used to simulate the flow through the evaporator and heater. The standard k-▪ model is used to consider the turbulent effect of air flow.