The limiting factors are the temperature at which the heat enters the engine, , and the temperature of the environment into which the engine exhausts its waste heat, , measured in an absolute scale, such as the Kelvin or Rankine scale.
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The LM1500 delivers 10,000 shaft horsepower (shp) (7,420 kW) with a thermal efficiency of 33 percent at ISO conditions
The power station opened in 1929 by the Earl of Derby, was to become highly regarded within the industry due to its excellent record of thermal efficiency.