Consider water again in a 1 liter bottle in the shape of a cylinder.
a. Estimate the combined thermal resistance of a 1 liter cylindrical bottle for the following situation:
The inside diameter of the bottle is equal to the inside height of the bottle
The wall thickness is 0.2 cm,
The bottle is made of aluminium,
The air is moving around the bottle at 10 m/s
Both convection and radiation occur on the outside of the bottle
b. Write the equation to assess the ratio of radiation resistance over convection resistance.
c. What is missing from numerically calculating the radiation heat transfer coefficient?
d. Is the fact that water is inside the bottle relevant, i.e. is it needed to assess the thermal resistance?
e. Is the fact that air is outside the bottle relevant?