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hamzaahmeds

This question involves the concepts of thermal efficiency.

The thermal efficiency of the heat engine is "68.75 %".

Thermal Efficiency

The thermal efficiency of the heat engine can be given by the following formula:

[tex]\eta=\frac{W}{Q}[/tex]

where,

  • η = thermal efficiency = ?
  • W = Work output = 660 Btu/lbm
  • Q = Heat Input = W + Rejected Heat = 660 Btu/lbm + 300 Btu/lbm   Q = 960 Btu/lbm

Therefore,

[tex]\eta=\frac{660\ Btu/lbm}{960\ Btu/lbm}[/tex]

η = 0.6875 = 68.75 %

Learn more about thermal efficiency here:

https://brainly.com/question/13677263

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