Hi Can some one help me out on how to calculate the work done by a cycle/heat engine? I am looking to calculate this in a graphical form, using P-v diagram and a numerical form, using an equation of work. I have state/process data for for cycle for volume an pressure for point 1-2/2-3/3-4/4-1. I have a compression and expansion index. If any one could help me out with the equation to use i would be real happy. If anyone can point me in the direction of some further reading on this subject i would be greatful too.