饱和蒸汽焓值计算公式（0-200度）
一阶拟合：
Linear model Poly1:
f(x) = p1*x + p2
Coefficients (with 95% confidence bounds):
p1 = ,
p2 = 2507 (2504, 2511)
Goodness of fit:
SSE: 3469
R-square:
Adjusted R-square:
RMSE:
Linear model Poly1:
f(x) = p1*x + p2
Coefficients (with 95% confidence bounds):
p1 = ,
p2 = 2504 (2503, 2504)
Goodness of fit:
SSE:
R-square:
Adjusted R-square:
RMSE:
Linear model Poly1:
f(x) = p1*x + p2
Coefficients (with 95% confidence bounds):
p1 = ,
p2 = 2502 (2501, 2503)
Goodness of fit:
SSE:
R-square:
Adjusted R-square:
RMSE:
二阶拟合：
Linear model Poly2:
f(x) = p1*x^2 + p2*x + p3
Coefficients (with 95% confidence bounds):
p1 = ,
p2 = ,
p3 = 2499 (2498, 2500)
Goodness of fit:
SSE:
R-square:
Adjusted R-square:
RMSE:
过热蒸汽焓值计算：
压力： 温度：500-580
压力： 温度：280-390
压力： 温度：260-320
有一个不分区的近似公式~我还没验证
