Answer to Question #312024 in Mechanical Engineering for Jul

Question #312024

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 explain the answer.


Answer: a. 6.8 KJ/kg-oK c. 6.6 KJ/kg-oK

b. 6.2 KJ/kg-oK d. 7.5KJ/kg-oK


1
Expert's answer
2022-03-17T12:10:02-0400

From the steam table;

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

h2=2775.6kJ/kgh_2=2775.6kJ/kg

For saturated liquid and vapour tables;

hf1=962.11kJ/kgh_{f_1}=962.11kJ/kg

hfg=1841kJ/kgh_{f_g}=1841kJ/kg

Also;

h1=h2h_1=h_2

h1=hf1+xhfg1h_1=h_{f_1}+xh_{fg_1}

x=h1hf1hfg1x=\frac{h_1-h_{f_1}}{h_{fg_1}}

x=2775.6962.111841x=\frac{2775.6-962.11}{1841}

x=0.985x=0.985

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