Why are
To Explain: Heat engines intentionally run at high operating temperatures.
Explanation of Solution
Introduction:
As per second law of thermodynamics, the heat transfers from a body at high temperature spontaneously to a body at lower temperature. Any device that transforms internal energy to mechanical work is called a heat engine.
Three processes that occur in every heat engine are:
- The internal energy increases by absorbing energy from hot reservoir.
- Some of the energy is converted into work.
- The remaining energy is expelled as heat to cold reservoir.
Ideal efficiency of a heat engine:
As the temperature of cold reservoir cannot be decreased below a limit, in order to increase the efficiency, the temperature of the source must be high.
Conclusion:
Heat engines are intentionally run at high operating temperatures to increase the efficiency.
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