Given below is an extract from steam tables. Specific enthalpy of water in kJ/kg at 150 bar and 45 C is
A. 203.60 B. 200.53 C. 196.38 D. 188.45
Answer: Let's first plot the data given in the question on the T-s plot. The 150 bar and 0.09559 bar pressure line are drawn. The saturation temperature at 150 bar is 342.24 C and 45 C at 0.09559 bar. The point A denotes the intersection of 150 bar pressure line with 45 C temperature. We have to find out the specific enthalpy at this point A.
Point A is in the compressed fluid region on the T-s plot.
Some facts about compressed liquid:
Compressed liquid tables are not as commonly available.
Compressed liquid properties do not depend much on pressure. Variation of properties of compressed liquid with pressure is very mild. Increasing the pressure 100 times often causes properties to change less than 1 percent.
