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 = 1.569 (1.528, 1.61)
p2 = 2507 (2504, 2511)
Goodness of fit:
SSE: 3469
R-square: 0.9916
Adjusted R-square: 0.9914
RMSE: 8.414
Linear model Poly1:
f(x) = p1*x + p2
Coefficients (with 95% confidence bounds):
p1 = 1.67 (1.659, 1.682)
p2 = 2504 (2503, 2504)
Goodness of fit:
SSE: 252.6
R-square: 0.9994
Adjusted R-square: 0.9994
RMSE: 2.271
Linear model Poly1:
f(x) = p1*x + p2
Coefficients (with 95% confidence bounds):
p1 = 1.777 (1.765, 1.7)
p2 = 2502 (2501, 2503)
Goodness of fit:
SSE: 295.6
R-square: 0.9993
Adjusted R-square: 0.9993
RMSE: 2.456
二阶拟合：
Linear model Poly2:
f(x) = p1*x^2 + p2*x + p3
Coefficients (with 95% confidence bounds):
p1 = -0.002719 (-0.002911, -0.002526)
p2 = 2.036 (2.002, 2.071)
p3 = 2499 (2498, 2500)
Goodness of fit:
SSE: 195.7
R-square: 0.9995
Adjusted R-square: 0.9995
RMSE: 2.019
过热蒸汽焓值计算：
压力：1.0-4.6MP 温度：500-580
压力：2.5-4.7MP 温度：280-390
压力：0.65-1.40MP 温度：260-320
有一个不分区的近似公式~我还没验证
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