Q5. An efficiency consultant is studying the power stroke of a four-stroke engine and determines the following: As the piston is forced down, the mixture of combustion products and air undergoes an adiabatic expansion. The engine is running at 3,100 cycles/min. The gauge pressure immediately before the expansion is 25.0 atm. The volumes of the mixture immediately before and after the expansion are 50.0 cm3 and 400 cm3, respectively (figure below). The time interval for the expansion is one-fourth the...
Known Answer: W12=-51.0 Btu, constant Cv: Q12= -19.2 Btu, Table A-22E: Q12=-18.8 Btu....... Please explain in detail how to use the table. 3.145 Air is compressed in a piston-cylinder assembly from pi = 10 lbf/in?, T1 = 500°R to a final volume of K2 = 1 ft in a process described by pun = constant, where n= 1.25. The mass of air is 1/2 lbm. Assuming ideal gas behavior and neglecting kinetic and potential energy effects, determine the work and...