Question

An inventor claims to have developed a heat engine working between temperature 27°c and 227°c having efficiency of 45% is the claim valid? Prove

Answer 1

Answer:

If this engine is only thermal, such an efficiency is theoretical impossible.

The thermal cycle can’t have a higher efficiency than the Carnot cycle operating between the same temperatures.

The latter has an efficiency of nearly 40%, moreover theoretical.

A real Carnot engine moreover would have quite less efficiency.

The alleged engine can’t have an efficiency of 45%.