heat added to the system and the heat that leaves the system; in other words, net gain of work is equal to the difference between the heat added to the system and the heat that leaves the system.

* Work in () is done by the piston compressing the air (system)
* Heat in () is done by the combustion of the fuel
* Work out () is done by the working fluid expanding and pushing a piston (this produces usable work)
* Heat out () is done by venting the air
* Net work produced = -

The

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