Avapour compression cycle using r134a refrigerant operated with an evaporator absolute pressure of 2 bar and a condenser saturation absolute pressure of 8 bar. the vapour entering the compressor is saturated at 2 bar and the liquid leaving the condenser is saturated at 8 bar. assuming the compression process is isentropic i. sketch the process on a p-h diagram. ii. identify the pressure and enthalpy at each of the four points on the refrigeration cycle. iii. calculate the coefficient of performance of the cycle.

At steady state, air at 200 kpa, 325 k, and mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. the inlet cross-sectional area is 6 cm2. at the duct exit, the pressure of the air is 100 kpa and the velocity is 250 m/s. neglecting potential energy effects and modeling air as an 1.008 kj/kg k, determine ideal gas with constant cp = (a) the velocity of the air at the inlet, in m/s. (b) the temperature of the air at the exit, in k. (c) the exit cross-sectional area, in cm2