Air enters the compressor of a regenerative gas-turbine engine at 310 K and 100 kPa, where it is compressed to 900 kPa and 650 K. The regenerator has an effectiveness of 80 percent, the air enters the turbine at 1400 K, and the turbine isentropic efficiency is 90 percent. Determine the exergy destruction associated with each of the processes of the cycle, assuming a source temperature of 1260 K and a sink temperature of 300 K. Also, determine the exergy of the exhaust gases at the exit of the regenerator. Take Pexhaust