An ideal Stirling engine using helium as the working fluid operates between temperature limits of 300 and

Question:

An ideal Stirling engine using helium as the working fluid operates between temperature limits of 300 and 2000 K and pressure limits of 150 kPa and 3 MPa. Assuming the mass of the helium used in the cycle is 0.12 kg, determine
(a) The thermal efficiency of the cycle,
(b) The amount of heat transfer in the regenerator, and
(c) The work output per cycle.