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Technical Paper

Virtual Design of HVAC Systems with Simulation under Competing HVAC Noise and Defrost Performance Requirements

2021-08-31
2021-01-1020
It is particularly easy to get tunnel vision as a domain expert, and focus only on the improvement one could provide in their area of expertise. To make matters worse, many organizations at OEMs are silo-ed by domain of expertise, unconsciously promoting this single mindedness in design. Unfortunately, the successful and profitable development of a vehicle is dependent on the delicate balance of many domains, involving multiple physics and departments. Taking for instance the design of an HVAC system, the device’s primary function is to control the climate system in vehicle cabins, and more importantly to make sure that critical areas on the windshield can be defrosted in cold weather conditions within regulation time. With the advent of electric and autonomous vehicles, further importance is now also placed on the energy efficiency of the HVAC, and its noise.
Technical Paper

Digital Aeroacoustics Design Method of Climate Systems for Improved Cabin Comfort

2017-06-05
2017-01-1787
Over the past decades, interior noise from wind noise or engine noise have been significantly reduced by leveraging improvements of both the overall vehicle design and of sound package. Consequently, noise sources originating from HVAC systems (Heat Ventilation and Air Conditioning), fans or exhaust systems are becoming more relevant for perceived quality and passenger comfort. This study focuses on HVAC systems and discusses a Flow-Induced Noise Detection Contributions (FIND Contributions) numerical method enabling the identification of the flow-induced noise sources inside and around HVAC systems. This methodology is based on the post-processing of unsteady flow results obtained using Lattice Boltzmann based Method (LBM) Computational Fluid Dynamics (CFD) simulations combined with LBM-simulated Acoustic Transfer Functions (ATF) between the position of the sources inside the system and the passenger’s ears.
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