Question

Calculate the efficiency of a Carnot Engine working between temperature of 1200°C and 200°C.

Answer 1

Answer:

efficiency = 0.678

Explanation:

First we have to change temperatures from °C to K (always in thermodynamics absolute temperature is used).

$\text{hot body temperature,}T_H = 1200 \circC + 273.15 = 1473.15 K$

$\text{cold body temperature,} T_C = 200 \circC + 273.15 = 473.15 K$

Efficiency $\eta$ of a carnot engine can be calculated only with hot body and cold body temperature by

$\eta = 1 - \frac{T_C}{T_H}$

$\eta = 1 - \frac{473.15 K}{1473.15 K}$

$\eta = 0.678$