8. An inventor claims to have developed a device requiring no work or heat transfer input, yet able to
produce hot and cold air streams at steady state. Data claimed by the inventor are shown below. The ideal
gas model can be used for the air, and kinetic and potential energy effects can be neglected. Evaluate this
claim in terms of (a) conservation of mass, (b) the 1st law of thermodynamics, and (c) the 2nd law of
thermodynamics. Show detailed steps to simplify balance equations. (6 pt)
Air at
20°C, 3 bar
$ \dot{Q}_{cv} = 0 $
$ \dot{W}_{cv} = 0 $
Air at
60°C, 2.7 bar
(2)
(3)
Air at
0°C, 2.7 bar