Question: estimate whether ice will form on a clear night when...
Estimate whether ice will form on a clear night when ambient air temperature is 45 F. If the water is placed in a shallow pan in a sheltered location, where the convective heat transfer coefficient is 0.5 Btu/hr ft^2 F.
Assume water is in freezing point and liquid phase. You need to
compare two effects:
1. Convective heat gain from ambient
2. Radiation heat loss to outside the atmosphere (temp can be assume absolute zero)
If first one is larger than the second one, it won't freeze and otherwise it does.