Heat Engine

A Heat Engine may be defined as a device that operates in a thermodynamic cycle and does a certain amount of net positive work through the transfer of heat from a high temperature body to a low temperature body. A system power plant is an example of a heat engine.

Thermal efficiency for a heat engine, ηHE is defined as:

Where,  
            Wcycle = Net work output 
                 QC = Heat rejected to the low temperature reservoir 
                 QH = Heat added (heat added) from the high temperature reservoir

It follows from Carnot's theorems that for a reversible cycle (QC/QH) is a function of temperatures of the two reservoirs only. i.e. QC/QH (TC,TH). 

If we choose the absolute (Kelvin) temperature scale then:
 

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