Question

Thermal efficiency of a heat engine is defined to be the ratio of energy output desirable to energy input. Would you think that efficiency is an appropriate definition to be used when a heat pump is being discussed? Why?

Answer 1

No, it is no the same

Step-by-step explanation:

In the heat engine, the machine receives heat to produce work, where we desire that the work produced is 100% of the heat received and giving the following expression:

`\eta=(Q_(c))/(W)`

But in the heat pump, we receive work to produce heat and our desire is to convert all the work received into heat, which gives us the expression:

`\eta=(W)/(Q_(c))`

Therefore the expressions are different.