An ideal air-standard Sterling cycle uses helium as working fluid. The isothermal compression brings the helium from

Question:

An ideal air-standard Sterling cycle uses helium as working fluid. The isothermal compression brings the helium from 15 lbf/in 2, 70 F to 90 lbf/in 2. The expansion takes place at 2100 R and there is no regenerator. Find the work and heat transfer in all four processes per lbm helium and the cycle efficiency.