ME_302_Quiz_5_Solution

# ME_302_Quiz_5_Solution - Name Solution ME 302 Quiz 5 When...

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Name: Solution ME 302 Quiz 5 When calculating the radiation from the sky (not to be confused with solar radiation), it is common to treat the radiation from the sky as if it was coming from the surroundings at T=Tsky' T sky is an effective temperature of the sky to correctly calculate the radiative heat flux coming from the sky. In deserts, the temperature of the night sky can drop to -40°C on clear nights. It is well known that a shallow pools of water can freeze (Tfreeze = 273 K) even if the ambient air temperature is 293 K. On a calm night with a very light breeze the convection coefficient between is h= 5 W 1m K and the emittance of the water is £=0.96. Will the water freeze? Comment if you think water will freeze on a windy night. You many consider the temperature of the water (or ice) to be uniform. Hint: It is may be easier to calculate the convection coefficient when the water is at the freezing temperature but is neither freezing nor melting. You justify your answer, draw a control

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ME_302_Quiz_5_Solution - Name Solution ME 302 Quiz 5 When...

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