ChemicaLogic Home
spacer.gif (846 bytes)

model comparisons

Comparing Latent Heat of Vaporization

Some of the largest deviations occur in the computation of the latent heat of vaporization, especially near the critical region. The results are summarized below:

Relative Error

IAPWS-97

NBS/NRC-84

IFC-67

Maximum absolute error

36.327%

60.610%

113.136%

Average absolute error

1.730%

2.165%

3.534%

Root Mean Square error

6.534%

8.304%

15.311%

Note: The IAPWS-95 formulation is used as the baseline for comparisons.

A chart of the deviations is available in PDF format. Also, the Excel spreadsheet used to generate this summary and chart is also available:

Download Comparing latent heat of vaporization (PDF file)

(10 KB; compare_latent_heat.pdf; January 21, 1999)

Download Comparing latent heat of vaporization - near the critical point (PDF file)

(8 KB; compare_latent_heat_cp.pdf; January 21, 1999)

Download Comparing latent heat of vaporization (Excel file)

(133 KB; compare_vapor_pressure.xls; January 21, 1999)