Technical note: Optimisation of the defroster ducts and windshield electric resistances of a city bus with CFD analysis Online publication date: Mon, 30-Nov-2009
by Salih Ozen Unverdi, Hayri Eren, Vadi Erdem, Nilgun Sonmez, Alper Emre, Volkan Bayraktar
International Journal of Vehicle Design (IJVD), Vol. 52, No. 1/2/3/4, 2010
Abstract: The windshield and side windows defrosting system performance of a city bus is improved with CFD analysis. The air flow rate is increased by reducing the pressure drop in the air inlet and outlet ducts. The air flow is evenly distributed among the vents by optimising the shape of the outlet duct. The heat transfer rate to the windshield is increased by adjusting the width of the vents and defrosting time is decreased by orienting the vents. The air speeds measured near the windshield increased by 350%. Defrosting 95% of the Area A on the windshield within 40 minutes, at Q-80 thermal conditions, is accomplished. But de-icing 80% of the Area B, in front of the driver, within 20 minutes cannot be fulfilled, because the defrost-box heat power is insufficient. To speed up de-icing, electric resistance wires are used as additional heat source. Air flow inside a defrost-box is analysed.
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