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1) Heat is being transferred to 1 kg of H2O (initially at 1 bar and 20oC)...

1) Heat is being transferred to 1 kg of H2O (initially at 1 bar and 20oC) in a piston-cylinder arrangement by convection heat transfer through the bottom of the cylinder (which has a surface area of 1m2). The air temperature is constant at 120oC. If it takes 100s to bring H2O to saturated vapor state at 1 bar, determine the convection heat transfer coefficient between the bottom of the cylinder and the air.

Note 1: The sides and the top of the cylinder can be considered adiabatic in order to simplify the problem.

Note 2: The piston and the cylinder material is very thin and can, therefore, be assumed to be at the same temperature with water at all times.

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