Using EES, solve problem 2 in HW 3 and study the effect of the compressor isentropic efficiency, the turbine isentropic efficiency, and the regenerator effectiveness on the total irreversibility of the cycle and the regenerator. Choose a reasonable range for each effect. Express each effect on an individual diagram (ex. Diagram of the compressor isentropic efficiency values versus the thermal efficiency and back work ratio).
HW3 (Problem 2):
A gas-turbine engine with regeneration operates with two stages of compression and two stages of expansion. The pressure ratio across each stage of the compressor and turbine is 3.5. The air enters each stage of the compressor at 300 K and each stage of the turbine at 1200 K. Determine the back work ratio and the thermal efficiency of the cycle, assuming variable specific heats for air with temperature. Also, assuming reasonable temperatures for the source and sink reservoirs, determine the total irreversibility of the cycle and the irreversibility of the regenerator.