A counterflow heat exchanger acting as a recuperator, of gas turbine receives compressed air operating at steady state at 650 K, 12 bars and exits at 850 K, 11.6 bars. Hot combustion from the exhaust of gas turbine enters as a separate stream at 1000 K, 1.1 bars and comes out at 1 bar. The mass flow rate of each stream is 200 kg/s. The heat transfer from the outer surface of the heat exchanger to surroundings may be neglected. The change in kinetic and potential energy are negligible. Take To = 228 K and Po = 1 bar. Assume ideal gas model for combustion gas. work out the following :
- Draw the system and show the temperature distribution for each stream
- The exit temperature of combustion gas
- The net change in the flow energy rate from inlet to outlet for each stream
- The energy distribution rate
- Comment on the results