In the series of physical properties calculation methods, I am now covering Ammonia P & T correlations which are frequently used in refrigeration system design calculations. Or they may be used for designing of heat pumps - yes may be I don't know at this stage if one can use ammonia for heat pump service or not.
Saturation Pressure vs Temperature.
This equation is valid for t = -75 to 70°C. I have limited this equation to this range for better accuracy of calculated data vis a vis comparison with published data.
Pv = A x T^5 + B x T^4 + C x T^3 + D x T^2 + E x T + F
where Pv = vapor pressure in Kg/cm2
T is temperature in Kelvin.
A = -4.5864778 x 10^-11
B = 9.85099347 x 10^-8
C = - 5.7526544 x 10^-5
D = 1.4773233 x 10^-2
E = -1.7847943
F = 83.3895705
Saturation Pressure vs Temperature for t > 70°C.
Pv = 89875.92511 exp (-2706.64791 / T)
where units are same as above.
Saturation Temperature Vs Pressure for P = 0 to 34 Kg/cm2.
T = A x y^5 + B x y^4 + C x y^3 + D x y^2 + E x y + F
Where
A = 0.13493672
B = 0.380555
C = 2.13810444
D = 10.058439
E = 45.5972648
F = 239.1719874
T is in Kelvin
List of other property estimation methods on this Blog.
Saturation Pressure vs Temperature.
This equation is valid for t = -75 to 70°C. I have limited this equation to this range for better accuracy of calculated data vis a vis comparison with published data.
Pv = A x T^5 + B x T^4 + C x T^3 + D x T^2 + E x T + F
where Pv = vapor pressure in Kg/cm2
T is temperature in Kelvin.
A = -4.5864778 x 10^-11
B = 9.85099347 x 10^-8
C = - 5.7526544 x 10^-5
D = 1.4773233 x 10^-2
E = -1.7847943
F = 83.3895705
Saturation Pressure vs Temperature for t > 70°C.
Pv = 89875.92511 exp (-2706.64791 / T)
where units are same as above.
Saturation Temperature Vs Pressure for P = 0 to 34 Kg/cm2.
T = A x y^5 + B x y^4 + C x y^3 + D x y^2 + E x y + F
Where
A = 0.13493672
B = 0.380555
C = 2.13810444
D = 10.058439
E = 45.5972648
F = 239.1719874
T is in Kelvin
List of other property estimation methods on this Blog.
- Calculate Diffusion Coefficient in Gases
- Calculate Diffusion Coefficient in Liquids
- Heat Capacities of dissolved solids & organic solutions - Quickest methods
- Heat capacities with dissolved solids
- Kinematic viscosity of air Vs Temperature
- Thermal Conductivity of air Vs Temperature
- How to calculate viscosity of liquid mixtures
- Surface Tension
- Viscosities of Pure Gases at Low Pressure - 1
- Viscosities of Pure Gases at Low Pressure - 2
- Viscosities of Pure Gases at High Pressure
- Viscosity of Gaseous Mixture
- Steam Properties - I
- Vapor Pressure Vs Temperature
- Latent Heat Calculation
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