Determine the following parameters for the water having quality x=0.7 at 200 kPa: a) the phase
compressed liquid
superheated vapor
saturated liquid
saturated vapor
saturated mixture
b) temperature (in °C)
c) specific volume, in m3/kg
d) specific energy, in kJ/kg
e) specific enthalpy, in kJ/kg
f) What is the enthalpy of 500 g of water (in kJ)?

Solution :

Given :

Water have quality x = 0.7 (dryness fraction) at around pressure of 200 kPa

The phase diagram is provided below.

a). The phase is a standard mixture.

b). At pressure, p = 200 kPa, T =

   Temperature = 120.21°C

c). Specific volume

d). Specific energy ()

e). Specific enthalpy

   At

f). Enthalpy at m = 0.5 kg

       = 1022.91 kJ

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