Volume Flow Calculation
Volume Flow Calculation
(OP)
Hello everyone, I need to calculate volume flow and I'm having a hard time doing it, help please.
A 1.5HP turbine at 3000 rpm, drives a fan, 14 inch in diameter. It takes it from ambient air to blow it into a duct heater. How much cubic feet per minute (CFM) of air does it move?
A 1.5HP turbine at 3000 rpm, drives a fan, 14 inch in diameter. It takes it from ambient air to blow it into a duct heater. How much cubic feet per minute (CFM) of air does it move?





RE: Volume Flow Calculation
unfortunately it seems your question is ill-posed. You can find infinite solutions for a fan of a certain diameter, running at a certain speed, which absorbs a certain power. You have at least three unknowns here: efficiency, flow, compression ratio.
Regards
RE: Volume Flow Calculation
RE: Volume Flow Calculation
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RE: Volume Flow Calculation
RE: Volume Flow Calculation
Just go measure it.
Even if you have the fan curve, you will still need to measure the static pressure, so If you are measuring stuff, just measure the flow.
RE: Volume Flow Calculation
Good Luck!
V
Mechanical Engineer/Consultant
Medical Devices
"When I am working on a problem, I do not think of beauty, but when I've finished, if the solution is not beautiful, I know it is wrong."
- R. Buckminster Fuller
RE: Volume Flow Calculation
I got an answer from a friend of mine. What about wind turbine equation? taken from kinetic eq. Power=1/2*airdensity*Area*velocity^3
If I solve for velocity, and then I multiply by area, I get a flow, then convert units.
Does that sound reasonable or am I waaaaaayy off??
Thanks again everyone.
RE: Volume Flow Calculation
If you had efficiencies for the fan and motor you could probably reduce that to waaay off.
All you need to measure is an ammeter, some plywood, a saber saw, clear hose and water.
RE: Volume Flow Calculation
RE: Volume Flow Calculation
as for measuring the flow speed; a leaf, a measuring tape, and a stop watch would get you pretty close ...
RE: Volume Flow Calculation
cheers,
gr2vessels