the diagram above represents a steam engine. if the high - pressure steam is 185°c and the low - pressure…

the diagram above represents a steam engine. if the high - pressure steam is 185°c and the low - pressure steam is 105°c, calculate the efficiency of the engine. el diagrama anterior representa una máquina de vapor. si el vapor a alta presión está a 185 °c y el vapor a baja presión a 105 °c, calcule la eficiencia de la máquina. a 43.2% b 56.7% c 76.2% d 176%

the diagram above represents a steam engine. if the high - pressure steam is 185°c and the low - pressure steam is 105°c, calculate the efficiency of the engine. el diagrama anterior representa una máquina de vapor. si el vapor a alta presión está a 185 °c y el vapor a baja presión a 105 °c, calcule la eficiencia de la máquina. a 43.2% b 56.7% c 76.2% d 176%

Answer

Explanation:

Step1: Convert temperatures to Kelvin

$T_{h}=185 + 273=458\ K$ $T_{l}=105 + 273=378\ K$

Step2: Use the efficiency formula for a heat - engine

$\eta = 1-\frac{T_{l}}{T_{h}}$ $\eta = 1-\frac{378}{458}$ $\eta = 1 - 0.8253$ $\eta=0.1747$

Step3: Convert efficiency to percentage

$\eta = 0.1747\times100% = 17.47%\approx17.6%$

Answer:

D. 17.6%