Asource of heat at 1000 k transfers 1000 kw of power to a power generation device, while producing 300 kw of useful work. determine: a. the rate of exergy destruction in this process, if the atmosphere is at 300k. b. the second law efficiency of the system.

Air enters a horizontal, constant-diameter heating duct operating at steady state at 290 k, 1 bar, with a volumetric flow rate of 0.25 m°/s, and exits at 325 k, 0.95 bar. the flow area is 0.04 m2. assuming the ideal gas model with k = 1.4 for the air, determine (a) the velocity at the inlet and exit, each in m/s, and (c) the rate of heat transfer, in kw flow rate, in kg/s, (b) the mass kg 0.3