1. An air compressor receives air at 290 K, 100 kPa and brings it up to a higher pressure in an adiabatic process. The actual specific work is 210 kJ/kg, and the isentropic efficiency is 82%. Find the exit pressure and the second-law efficiency.
2. A flow of 2 kg/s water at 1000 kPa, 80?C goes into a constant-pressure boiler, where the water is heated to 400?C. Assume the hot gas that heats the water is air coming in at 1200 K and leaving at 900 K, as in a counter flowing heat exchanger. Find the total rate of irreversibility in the process and the second-law efficiency of the boiler setup.