(use variable specific heats for all problems, i.e., use Table A-17 for u and h

Question

(use variable specific heats for all problems, i.e., use
Table A-17 for u and h values)

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, and the air enters the turbine at 1400 K. For a turbine efficiency of 90 percent, determine (a) the amount of heat transfer in the regenerator and (b) the thermal efficiency. Assume variable specific heats for air. Answers: (a) 193 kJ/kg, (b) 40.0 percent

Explanation / Answer

For each component in the gas turbine cycle we assume that the component is steady flow with negligible kinetic and potential energy changes. Each component has one inlet and one outlet so that the general first law for each component in this system is q = wu + hout

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