Hi Could any one help me with this? How would i go about calculating the thermal efficiency of a heat engine with four processes? I am thinking of moddeling it on the Otto or Diesel Cycle. The data i have is. Temp @ State/Process 1 Specific Gas Constant Specific Heat Capacity and i have Pressure Volume for states one, two, three and four. How would i got about figuring out the thermal efficiency? do i use a NFEE equation? Thanks for any help.