solution

Solve Problem 9.3 on a cold air-standard basis with specific heats evaluated at 300 K.

Consider the cycle in Problem 9.3 as a model of the processes in each cylinder of a spark-ignition engine. If the engine has four cylinders and the cycle is repeated 1200 times per min in each cylinder, determine the net power output, in kW.

An air-standard Otto cycle has a compression ratio of 6 and the temperature and pressure at the beginning of the compression process are 520R and 14.2 lbf/in.2 , respectively. The heat addition per unit mass of air is 600 Btu/lb. Determine

(a) the maximum temperature, in R.

(b) the maximum pressure, in lbf/in.2

(c) the thermal efficiency.