data provided by aspen One V7 databanks

I can't understand why when I seek the values of the enthalpy for a component like ammonia or water with the Aspen Properties, the values that provided by the software is not compatible with the exact values tabulated and given by the site: [url=http://webbook.nist.gov/chemistry/fluid/]Thermophysical Properties of Fluid Systems[/url]
it's abnormal the databank is the same provided by the NIST
i can't use any software of the Aspen suite because of wrong value that provides the databanks incuded in the suite.
please if someone encounter the same probleme show me the way that i can resolve it.
thahks

i dont belive this :o)

i mean, this is your problem:
Isothermal properties Saturation properties — temperature increments
Isobaric properties Saturation properties — pressure increments
Isochoric properties

i dont belive this :o)

i mean, this is your problem:
Isothermal properties Saturation properties — temperature increments
Isobaric properties Saturation properties — pressure increments
Isochoric properties

Thats Aspen, just change the values to those in the literature. It at least gives the user that level of control.

The values of the properties varies depending on the property method that you use. Example, for water, you should use steam-ta, steamnbs, or stmnbs2. You should look for the best suitable property method for each component and/or process. Hope this helps