a 2.5-m high 120-m2 house is maintained at 24c by an air-conditioning system whose COP is 2.9 . it is estimated that the kitchen, bath, and other ventilating fans of the house discharge a houseful of conditioned air once every hour . if the density of air is 1.20 kg/m3 , the unit cost of electricity is 0.18 / kwh and the amount of money " vented out" by the fans in 8 hours is 0.75 , determine the outdoor temperature

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?