Answer to Question #314907 in Mechanical Engineering for Helen

Question #314907

6. A throttling calorimeter is connected to the superheated steam line supplying steam to the auxiliary feed pump on a ship. The line pressure measures 2.5 Mpa. The calorimeter pressure is 110 kpa and 150oC. Determine the entropy of the steam line. Please detailed the solution and answer.


1
Expert's answer
2022-03-23T02:56:02-0400

From the steam table;

Superheated steam at 110kPa,150°C we obtained;

"h_2=2775.6kJ\/kg"

For saturated liquid and vapour tables;

"h_{f_1}=962.11kJ\/kg"

"h_{f_g}=1841kJ\/kg"

Also;

"h_1=h_2"

"h_1=h_{f_1}+xh_{fg_1}"

"x=\\frac{h_1-h_{f_1}}{h_{fg_1}}"

"x=\\frac{2775.6-962.11}{1841}"

"x=0.985"

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