Question

If P=30 kPa and S= 6.983 KJ/kg. Find v, u & h.

Answer 1

v = 4.6275 m^3/kg

u = 2217.215 kJ/kg

h = 2356.0105 kJ/kg

Step-by-step explanation:

Given data:

From steam table

At 30 Kpa

vf = 0.001022 m^3/kg vg = 5.2287 m^3/kg

uf = 289.24 kJ/kg ufg = 2178.5 kJ/kg

hf = 289.27 kJ/kg hfg = 2335.3 kJ/kg

sf = 0.9441 kJ/kg K sfg = 6.8234 kJ/kg K

we know specific heat is given as

`s = sf + x* sfg`

`6.983 = 0.9441 + x* 6.8234`

x = 0.885

`v = vf + x(vg -vf)`

`v = 0.001022 + 0.885*(5.2287-0.001022)`

v = 4.6275 m^3/kg

`u = uf +x* ufg`

`u = 289.24 + 0.885* 2178.5`

u = 2217.215 kJ/kg

`h = hf +x* hfg`

`h = 289.27 + 0.885* 2335.3`

h = 2356.0105 kJ/kg