The pressure and temperature at the beginning of compression of an air-standard Diesel cycle are 95 kPa and 290 K. At the end of the heat addition, the pressure is 6.5 MPa and the temperature is 2000 K. Using cold air-standard assumptions (properties at 300 K), determine (a) the compression ratio, (b) the cutoff ratio, (c) the thermal efficiency of the cycle, and (d) the mean effective pressure, in kPa.

Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?