A pump with inlet of saturated liquid at 600kPa has an exit stream of 10MPa calculate work
Energy balance equation
Entropy balance equation
The Attempt at a Solution
My attempt at the solution was to calculate the entropy of the fluid at the inlet. I know since a pump is isentropic
And that through an energy balance for a pump
Where the work i know has to be positive.
I interpolated from the data a value for my entropy (1.93) and since I know it to be isentropic I used that point to find a value for enthalpy. My problem is doing that route I get a smaller value of enthalpy going out because the entropy data points for my interpolation are larger than my calculated value. This result leaves me with a negative value for work which I know to be wrong.
I did however attempt it another way with the approach of knowing it to be a saturated liquid at the outlet @10MPa which gave me a different value of enthalpy leaving me with a positive value for work.
Do I just use that value or do I need to interpolate other data points to get a value for entropy ie; using temperature
Any and all help is appreciated