1. A two-stage compressor takes nitrogen in at 20?C, 150 kPa and compresses it to 600 kPa, 450 K. Then it flows through an intercooler, where it cools to 320 K, and the second stage compresses it to 3000 kPa, 530 K. Find the specific exergy increase and the specific exergy destruction in each of the two compressor stages.
2. The intercooler in the previous problem uses cold liquid water to cool the nitrogen. The nitrogen flow is 0.1 kg/s, and the liquid water inlet is 20?C and is setup to flow in the opposite direction from the nitrogen, so the water leaves at 35?C. Find the flow rate of the water and the exergy destruction in this intercooler.