Develop the Clapeyron equation for the pure substance changing the phase. Hence find the enthalpy of evaporation for R-22 at 10 0C and compare the same with the tabulated value. What is the percentage error involved?
Properties of R - 22
|
Ts 0C
|
ps
kPa
|
vf
litres/kg
|
vs
m3/kg
|
hfg
kJ/kg
|
|
20
–10
0
|
244.72
354.16
497.41
|
0.7409
0.7587
0.7783
|
0.0929
0.0654
0.0472
|
220.331
213.136
205.369
|