funkybrown
21-06-2010, 01:16 PM
Hi all,
I am hoping someone can help me, now I know I might get some abuse for this, mostly due to the fact it's to do with heating, not refrigeration... but I have been a member a little while now, even if my post count is so very low, and thought if anyone can help it's you guys...
I have seen lots of formulae written on the net, and have tried to add my numbers to them, but to no avail... rather than using a program, I would like to understand it myself!
For this example (although I'm making a spreadsheet with thousands of possible results for all types of fluid) could you please use:
Mass Flow 200 kg/h
pipe length 7100 mm
pipe diam 37 mm
pipe roughness 0.04 mm
density (viscosity) 523.8 kg/m³
Dinamic viscosity 0.0001 Pas
Spec.Heat 2310 J/kgK
Minor loss coeff. 1 (yet to work out an 8coil oval pipe)
Temp in 30°C
Pressure in 50Bar
It may help, but you can calc from those:
Vol. Flow rate 0.3818 m³/h
velocity 0.09865 m/s
friction coeff 0.026907
kinematic visc. 1.909E-07 m²/s
Reynolds 19118.275
boundary layer thickness 0.4161 mm
So please if anyone can calculate and show the working for pressure drop, I would most appreciate it.
Regards
James
I am hoping someone can help me, now I know I might get some abuse for this, mostly due to the fact it's to do with heating, not refrigeration... but I have been a member a little while now, even if my post count is so very low, and thought if anyone can help it's you guys...
I have seen lots of formulae written on the net, and have tried to add my numbers to them, but to no avail... rather than using a program, I would like to understand it myself!
For this example (although I'm making a spreadsheet with thousands of possible results for all types of fluid) could you please use:
Mass Flow 200 kg/h
pipe length 7100 mm
pipe diam 37 mm
pipe roughness 0.04 mm
density (viscosity) 523.8 kg/m³
Dinamic viscosity 0.0001 Pas
Spec.Heat 2310 J/kgK
Minor loss coeff. 1 (yet to work out an 8coil oval pipe)
Temp in 30°C
Pressure in 50Bar
It may help, but you can calc from those:
Vol. Flow rate 0.3818 m³/h
velocity 0.09865 m/s
friction coeff 0.026907
kinematic visc. 1.909E-07 m²/s
Reynolds 19118.275
boundary layer thickness 0.4161 mm
So please if anyone can calculate and show the working for pressure drop, I would most appreciate it.
Regards
James