Class: Toji::Swvp::Wagner

Inherits:

Object

• Object
• Toji::Swvp::Wagner

Includes:

Singleton, Base

Defined in:

lib/toji/swvp/wagner.rb

Overview

Wagnerの式

Constant Summary

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

• #calc(temp) ⇒ Object

Instance Method Details

#calc(temp) ⇒ Object

# 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