|Carnot Engine from Wikipedia|
The Qn is the energy in, Qc is the energy out and W is the work. So Qh=Qc+W, If Qc=W, then only half of the energy is converted into usable work. Only half is pretty damn good really, your car engine is only about 0.35Qh. A modern gas turbine engine is close to 0.45Qc and if you add a cogeneration process like a steam turbine that uses the some of the 0.55Qh which is Qc, you can get more work, kicking the entire process up to 0.6Qh, or 60 percent efficiency.
|Two Stage Carnot Heat Engine|
|Atmosphere as a Carnot Heat Engine|
As all Red Neck Theoretical Physicists know the best place to start is at the beginning. For maximum entropy, W=Qc=S for each process and the whole process. If it doesn't, try to figure out why.
|Atmosphere as a Carnot Heat Engine and some Initial Values to Play with|