thermal efficiency

noun Thermodynamics.
the ratio of the work output of a heat engine to the heat input expressed in the same units of energy.

Origin:
1905–10

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thermal efficiency
 
n
Compare efficiency the ratio of the work done by a heat engine to the energy supplied to it

Collins English Dictionary - Complete & Unabridged 10th Edition
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Main Entry:  thermal efficiency
Part of Speech:  n
Definition:  in thermodynamics, the amount of work done by a heat engine divided by the thermal energy required to drive it; also, the ratio of the work done an engine to the work due to the heat supplied to it
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Example sentences
Higher thermal efficiency due to cold air will offset cost of air cooling.
Due to the higher operating temperature it had a higher thermal efficiency.
The obvious one is the improvements in the actual thermal efficiency of engines
  and manufacturing processes.
Engineers focused on increasing thermal efficiency and reducing friction,
  especially when the engine is warming up.
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