## Thermal Efficiency

The second law of thermodynamic states that Q_{out} can never equal zero. This means that no process that converts energy into work can be 100% efficient. To calculate thermal efficiency the following equation would be used.

In all real life systems some of the input energy is wasted, and is very difficult to save Q_{out} since it must be reject to complete the cycle. For example, most auto engines have a 25% efficiency, while diesel engines have a 40% efficiency, and finally a well designed gas turbine power plant can have a 60% efficiency.

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