(1) Air enters the compressor of a regenerative gas-turbine engine at 300 K and 100 kPa, where it is compressed to 800 kPa and 580 K. The regenerator has an effectiveness of 75 percent, and the air enters the turbine at 1200 K. For a turbine efficiency of 84 percent, determine (a) the amount of heat transfer in the regenerator and (b) the thermal efficiency. Assume variable specific heats for air. (2) Determine the exergy destruction associated with each of the processes of the Brayton cycle described in the problem above, assuming a source temperature of 1200 K and a sink temperature of 300 K. Also, determine the exergy of the exhaust gases at the exit of the regenerator. Take Pexhaust = P0 = 100 kPa. qreg= 167.24 KJ/Kg , thermal efficiency is 34.9%
(1) Air enters the compressor of a regenerative gas-turbine engine at 300 K and 100 kPa, where it is compressed to 800 kPa and 580 K. The regenerator has an effectiveness of 75 percent, and the air enters the turbine at 1200 K. For a turbine efficiency of 84 percent, determine (a) the amount of heat transfer in the regenerator and (b) the thermal efficiency. Assume variable specific heats for air.
(2) Determine the exergy destruction associated with each of the processes of the Brayton cycle described in the problem above, assuming a source temperature of 1200 K and a sink temperature of 300 K. Also, determine the exergy of the exhaust gases at the exit of the regenerator. Take Pexhaust = P0 = 100 kPa.
qreg= 167.24 KJ/Kg , thermal efficiency is 34.9%
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