An engine has an effi ciency e1. The engine takes input
Chapter , Problem 99(choose chapter or problem)
An engine has an effi ciency e1. The engine takes input heat of magnitude uQHu from a hot reservoir and delivers work of magnitude uW1u. The heat rejected by this engine is used as input heat for a second engine, which has an effi ciency e2 and delivers work of magnitude uW2u. The overall effi ciency of this two-engine device is the magnitude of the total work delivered (uW1u 1 uW2u) divided by the magnitude uQHu of the input heat. Find an expression for the overall effi ciency e in terms of e1 and e2.
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