Equation for
Equation for
(OP)
Dear friends,
I use the following equation to calculate water VP.
Error is very insignificant as shown below:
VP.Calctd VP from
Temp°F Psia Steam Table %Error
212 14.701 14.696 0.040
259.28 35.650 35.0 0.145
292.71 60.071 60.0 0.1198
316.25 85.135 85.0 0.1589
341.25 120.154 120.0 0.1285
Someone could give similar equation for Specific Heat, Thermal conductiviy, Viscosity of water to feed in the EXCEL spreadsheet.
I use the following equation to calculate water VP.
Error is very insignificant as shown below:
VP.Calctd VP from
Temp°F Psia Steam Table %Error
212 14.701 14.696 0.040
259.28 35.650 35.0 0.145
292.71 60.071 60.0 0.1198
316.25 85.135 85.0 0.1589
341.25 120.154 120.0 0.1285
Someone could give similar equation for Specific Heat, Thermal conductiviy, Viscosity of water to feed in the EXCEL spreadsheet.





RE: Equation for
http://home.hccnet.nl/m.dijk/pressure_drop_calculator/calcs/calcs.html
download to PDFs on bottom of web page,
MVD
RE: Equation for
Thanks for your quick and useful reply.
RE: Equation for
Liquid enthalpy (btu/lb)
H = -31.1247 + 0.96903T + 1.1301*10-4T2
Liquid specific heat [Btu/(lb*oF)]
Cp = 1.0152 - 3.6171*10-4T + 2.1709*10-6T2 - 2.9831*10-9T3
liquid viscosity [lb/(h.ft)]
visc = -0.23535 + 208.65/T - 2.074.8/T2
Liquid thermal conductivity [Btu/(lb*oF*ft)]
k = 0.31171 + 6.2278*10-4T - 1.1159*10-6T2
The same article gives vapour properties. Maximum error (%) and standard deviations (%) are also tabulated.
RE: Equation for
Thanks from heart for your VERY USEFUL and quick reply.
Today, I also managed to get the same article from our library.
For liq viscocity, the error is about 20.23%, this is the highest also.
Any better equation is available for liq viscocity.
Thanks in advance
RE: Equation for
RE: Equation for
T = 100 (P)^1/4
Where , T = deg.C
P = Barg.
** Error is very negligible.
Best of luck.
Pronab.
RE: Equation for
A "Water Propeties Program" file is available for download for FREE from www.cheresources.com/software.shtml
The link is a direct link to the executable file.
I have found the program very useful - it gives density, viscosity, Prandtl's number, Spec. Heat, thermal Conductivity, thermal expansion, Vapour pressure, etc for water between 0 and 150 Deg C.
RE: Equation for
Thanks a lot for the very useful info.