Find the engine efficiency if the heater temperature is 97 ° C and the refrigerator temperature is 17 ° C.

Let’s write down what is given and what we need to find briefly.

Given:

Theat = 97 ° C;

Tcold = 17 ° C.

To find:

Efficiency -?

To solve the problem, we will apply the formula from the Cardo cycle.

In thermodynamics, the Carnot cycle or the Carnot process is an ideal circular process consisting of two adiabatic and two isothermal processes. In the Carnot process, a thermodynamic system performs mechanical work by exchanging heat with two heat reservoirs that have constant but different temperatures.

Efficiency = (Theat – Tcold) / Tnat = 1 – Tchol / Tnag = 1 – 97/17 = 1 – 0.18 = 0.82 or 82%.