Question

A rigid tank initially contains 2 kg of steam at 500 kPa and 350°C. The steam is then cooled until it is at 100°C. Determine the final pressure and the heat transferred during this process.

Answer 1

Answer:

299.36 kPa

Explanation:

given mass of steam =2 kg

initial pressure that is $P_1=500kPa$

initial temperature that is $T_1=350^{\circ} C=350+273=623 K$

final temperature that is $T_2=100^{\circ} C=100+273=373 K$

it is a rigid tank so volume is constant

for constant volume process $\frac{P_1}{T_1}=\frac{P_2}{T_2}$

$P_2=\frac{T_2}{T_1}\times P_1=\frac{373}{623}\times 500=299.36 kPa$

so the final pressure will be 299.36 kPa