To fix state 1 we will use our process description which will gives us our entropy at state 2, which together with the pressure should fix the state. The shaft power is then calculated from the 1 st law. We start by completing our information for state 2. Problem 3 Air is contained in a piston cylinder device initially at 320 K and 110 kPa and a volume of 0.4 liters. The air then undergoes a polytropic compression process with a polytropic exponent of 1.6 to a volume 0.04074 liters.
Italicized values are from ideal gas relations or air tables.
Bold values are calculated. The boundary work is then calculated. Finally we use the conservation of energy to determine the heat transfer. We start by determining our mass.