Class: Toji::Swvp::Wagner

Inherits:
Object
  • Object
show all
Includes:
Singleton, Base
Defined in:
lib/toji/swvp/wagner.rb

Overview

Wagnerの式

Constant Summary collapse

Pc =

hPa：臨界圧

221200
Tc =

K：臨界温度

647.3
A = 
-7.76451
B = 
1.45838
C = 
-2.7758
D = 
-1.2303

Instance Method Summary collapse

Instance Method Details

#calc(temp) ⇒ Object 



18
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# File 'lib/toji/swvp/wagner.rb', line 18

def calc(temp)
  x = 1 - (temp.to_f + 273.15) / Tc
  Pc * Math.exp((A * x + B * x**1.5 + C * x**3 + D * x**6) / (1 - x)) 
end