Question

A Carnot heat engine absorbs 235 KW of heat from a heat source and rejects 164 KW to the atmosphere. Determine the thermal efficiency of the heat engine.

Answer 1

Answer:

43.2%

Explanation:

Given that,

Heat absorbed by a carnot heat engine, $Q_1=235\ kW$

Heat rejected to the atmosphere, $Q_2=164\ kW$

We need ti find the thermal efficiency of the heat engine. It is equal to the ratio of output work to the energy supplied. Its mathematical form is given by :

$\eta=1-\dfrac{Q_1}{Q_2}\\\\\eta=1-\dfrac{235}{164}\\\\\eta=-0.432$

or

$\eta=-43.2\%$

The egative value of efficiency shows work is done by the engine.