A free floating piston-cylinder device with 1.0 kg of air as the working fluid i

Question

A free floating piston-cylinder device with 1.0 kg of air as the working fluid is initially at rest at a temp of 300K ( 27°C). A paddle wheel is turned on for 10 min and it delivers 200 kJ of energy over the 10 min. Heat is also allowed to flow in/out on the container. The final temperature inside the container is 400K when equilibrium is reached. Remember; h=u+pv and Cp for air is 1.005 kJ/kg K and Cv for air is 0.718 kJ/kg K.

a) Sketch this process on a p-v diagram and label the initial and final states as 1 and 2.

Also label the initial and final temperatures.

b) What is the amount of heat transfer of this system?     

c) Does the heat flow in or out?

Explanation / Answer

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