An inventor claims to have developed a device requiring no energy transfer by heat or work, yet able to produce hot and cold streams of air from a single stream of air at an intermediate temperature. Steady-state test data provided by the inventor indicate that the air enters the device at a pressure and temperature, respectively of 5 bars and 39°C and leaves the device as cold air stream at
–21°C and as hot air-stream at 79°C each at a pressure of 1 bar. Further, it is also noted that 40% of the mass of air is entering the device as cold stream. Neglecting any changes in kinetic and potential energies of the streams at inlet and exit sections and using ideal gas model with CP and R for air, respectively at 1.005kJ/kg-K and 0.287 kJ/kg-K, evaluate the claim using energy and entropy balances. Sketch the device as a control volume.