By doing regression analysis, the equation for the saturated steam P-T relationship
can be established per section to obtain a high coefficient of determination.
Table 3.4:Saturated steam P-T relationship.
Pressure Range (Pa) 3
rd
Order Polynomial Equation (Temp in K)
615 - 2250 y = 2.806712E-9 x
3
– 1.54137E-5 x
2
+ 3.718675E-3 x +
255.555589
2251 - 12500 y = 2.530233E-11 x
3
– 7.262444E-7 x
2
+ 9.024094E-3
x + 275.9391
12501 - 68500 y = 1.687943E-13 x
3
– 2.8014759E-8 x
2
+ 2.011675E-3
x + 302.6508
68501 - 355000 y = 1.348662E-15 x
3
– 1.208023E-9 x
2
+ 4.775155E-4
x + 335.5453
355001 - 1700000 y = 1.438385E-17 x
3
– 6.381275E-11 x
2
+ 1.273902E-4 ...
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