To prevent condensation on a car's windshield, warm air must be discharged on its inner surface,...
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To prevent condensation on a car's windshield, warm air must be discharged on its inner surface, to keep it at a temperature higher than the dew point (10°C). Consider a windshield that is 0.8 m long, a car travelling at 70 mph in ambient air (-15°C). If the car defroster discharges air at 40°C, flowing from the base of the windshield up, what should be the speed of air exiting the defroster to prevent condensation? For simplicity, consider the air flow generated by the defroster to be either laminar only or turbulent only, depending on the Reynolds number at the end of the windshield, and use Nusselt correlations that do not depend on the viscosity ratios. Note: you will have to estimate some parameters that are missing in the problem. [30] To prevent condensation on a car's windshield, warm air must be discharged on its inner surface, to keep it at a temperature higher than the dew point (10°C). Consider a windshield that is 0.8 m long, a car travelling at 70 mph in ambient air (-15°C). If the car defroster discharges air at 40°C, flowing from the base of the windshield up, what should be the speed of air exiting the defroster to prevent condensation? For simplicity, consider the air flow generated by the defroster to be either laminar only or turbulent only, depending on the Reynolds number at the end of the windshield, and use Nusselt correlations that do not depend on the viscosity ratios. Note: you will have to estimate some parameters that are missing in the problem. [30]
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1 Properties and Assumptions Windshield length L 08 m Car speed v 70 mph 3129 ms Ambient air temperature Ta 15C Dew point Tdew 10C Defroster air tempe... View the full answer
Related Book For
Fundamentals of Heat and Mass Transfer
ISBN: 978-0471457282
6th Edition
Authors: Incropera, Dewitt, Bergman, Lavine
Posted Date:
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