ME_302_Quiz_5_Solution

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

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 3

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online