Pressure Decrease (Isentropic Process) During a reversible adiabatic process of 1 lbm of an ideal gas in a piston-cylinder, the pressure decreases from 196.8 psi to 15.8 psi. The gas constant is 37.7 ft. lb/lbm. oR and the initial temperature of the gas is 863 oF. Determine
a) the initial and final gas density in [Ibm/ft'].
b) the total work produced in [ft. lb].
c) the total change in internal energy in [Btu].
Assume that the specific heat at constant pressure is cp 0.22 Btu/lbm.
pi = 0.568 Ibm/ft3
W = -75,210 ft. lb
AU = -96.3
p2 = 0.080 lbm/ft3