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Study on effect of HVAC Air Flow Distribution on Windows Fogging
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on November 21, 2019 by SAE International in United States
Event: NuGen Summit
Windshield & Windows fogging up in cars has long been a topic of interest & concern. Lot of research has already been put into Front/Rear windshield fogging up issue and, Defrosters, Heated Windshields have been designed to remove the fog effectively. However, Windows Fogging up is still one of the major concerns faced while driving, as it obscures the drivers' field of vision and raises safety concerns. Windows fogging up is a phenomenon in which Moisture is condensed on the glass of the window. It is classified into two categories - Inside Fogging and Outside Fogging. When Ambient temperature is lower than the cabin temperature, the moisture is condensed on the inside surface of the glass. In this case the moisture is added inside the cabin by the occupants when they exhale air. Similarly when the Cabin temperature is lower than the ambient temperature, the moisture from atmosphere is condensed on the outer surface of the glass. A Survey with 500 Indian Customers has been conducted to understand the occurrence of Windows fog up issue in detail. The Survey lead us to an interesting observation in which around 65% of customers have faced issue of windows fogging up. Our study elaborates an approach to avoid fogging up by optimising the HVAC air flow distribution through Dash Board air vents. Various Simulations which were carried out in Climatic Wind Tunnel Chamber has proved this approach to have a positive impact on preventing windows from fogging up.