Saturation Properties for Ammonia — Temperature Increments

• Liquid Phase Data
• Vapor Phase Data
• Auxiliary Data
• References and Notes
• Notes
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Liquid Phase Data

Data on Saturation Curve

Vapor Phase Data

Data on Saturation Curve

Auxiliary Data

Reference States, default for fluid

Additional fluid properties

References and Notes

Equation of state

Gao, K., Wu, J., Bell, I.H., and Lemmon, E.W., "Thermodynamic Properties of Ammonia for Temperatures from the Melting Line to 725 K and Pressures to 1000 MPa," to be submitted to J. Phys. Chem. Ref. Data, 2018.

The uncertainties in the vapor phase in density are 0.1% at temperatures between 410 K and 580 K with pressures below 100 MPa, and 0.05% at temperatures between 220 K and 400 K with pressures below 10 MPa. In the liquid phase, the uncertainty in density is 0.05% at temperatures between 190 K and 400 K with pressures below 200 MPa. The uncertainty in density is 1.5% at pressures between 200 MPa and 1000 MPa. In the critical region, the uncertainty in density is estimated to be 1%.

The uncertainty in vapor pressure is 0.05% at temperatures between 200 K and 404 K. The uncertainty in saturated liquid density is 0.1% at temperatures between 195 K and 400 K. The uncertainty in saturated vapor density is 2% at temperatures between 220 K and 395 K. The uncertainties in speed of sound are 0.1% in the vapor phase at temperatures between 300 K and 375 K with pressures below 3.5 MPa, and 1% in the liquid phase at temperatures between 195 K and 410 K with pressures below 125 MPa. The uncertainties in isobaric heat capacity are 0.5% in the vapor phase at temperatures between 255 K and 425 K, and 5% in the liquid phase at temperatures between 330 K and 400 K with pressures below 11 MPa. The uncertainty in saturation heat capacity is 0.5% at temperatures between 200 K and 320 K.

Auxillary model, Cp0

Gao, K., Wu, J., Bell, I.H., and Lemmon, E.W., 2018.

Auxillary model, PX0

Gao, K., Wu, J., Bell, I.H., and Lemmon, E.W., 2018.

Viscosity

Monogenidou, S.A., Assael, M.J., and Huber, M.L. "Reference Correlation of the Viscosity of Ammonia from the Triple Point to 700 K and up to 50 MPa," accepted for publication in J. Phys. Chem. Ref. Data, 2018.

The estimated uncertainty for pressures up to 50 MPa is 4%. The equation may be used up to 100 MPa but the uncertainty will be larger, especially at lower temperatures.

Auxillary model, the collision integral

Monogenidou, S., Assael, M.J., and Huber, M.L., 2018.

Thermal conductivity

Monogenidou, S.A., Assael, M.J., and Huber, M.L., "Reference Correlations for Thermal Conductivity of Ammonia from the Triple Point to 680 K and up to 80 MPa," accepted for publication in J. Phys. Chem. Ref. Data, 2018.

The estimated uncertainty for pressures up to 80 MPa is 6.8%. The equation may be used up to 100 MPa but the uncertainty will be larger, and also larger near the critical point.

Auxillary model, the thermal conductivity critical enhancement

Monogenidou, S.A., Assael, M.J., and Huber, M.L., 2018.

Surface tension

Metling line

Sublimation line

Based on N. Fray and B. Schmitt, Planet. Space Sci. 57:2053-2080, 2009. Modified to match the triple point of the equation of state.

Vapor pressure

Gao, K., 2018.

Functional Form: P=Pc*EXP[SUM(Ni*Theta^ti)*Tc/T] where Theta=1-T/Tc, Tc and Pc are the reducing parameters below, which are followed by rows containing Ni and ti.

Saturated liquid density

Gao, K., 2018.

Functional Form: D=Dc*[1+SUM(Ni*Theta^ti)] where Theta=1-T/Tc, Tc and Dc are the reducing parameters below, which are followed by rows containing Ni and ti.

Saturated liquid volume

Gao, K., 2018.

Functional Form: D=Dc*EXP[SUM(Ni*Theta^ti)] where Theta=1-T/Tc, Tc and Dc are the reducing parameters below, which are followed by rows containing Ni and ti.

Notes

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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