- #1

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Any tips to design this?

I have tried a way, but I think it's very wrong.

Thanks in advance :)

- Thread starter mink_man
- Start date

- #1

- 23

- 0

Any tips to design this?

I have tried a way, but I think it's very wrong.

Thanks in advance :)

- #2

- 4,662

- 5

So 1 liter per second up 1 meter is 9.81 watts.

- #3

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So you're saying, 9.81Sin(63) would give the energy gotten from water being flowing down a tube at 63 degrees? Or is that wrong?^{2}/sec^{2}=9.81 Newton-meters = 9.81 joules.

So 1 liter per second up 1 meter is 9.81 watts.

- #4

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- #5

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The task is to design an archimedes screw turbine to power an 80 watt pump.

I can assume flow rates, head, etc.

The turbine will be at 63 degrees, so I need to find out the size of the turbine.

- #6

russ_watters

Mentor

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- #7

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Ok, I can assume and make up heads, so assuming a head of 2m.

What's next?

I can assume flow rates too if need be.

- #8

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I found this formula

"Power = Head X Flow X 7"

So I can fill in the head to get a flow rate?

"Power = Head X Flow X 7"

So I can fill in the head to get a flow rate?

- #9

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Would this be correct?

Ph = q ρ g h / (3.6 106) (1)

where

Ph = power (kW)

q = flow capacity (m3/h)

ρ = density of fluid (kg/m3)

g = gravity (9.81 m/s2)

h = differential head (m)

- #10

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- #11

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sorry, the q is in m3/hr, so it would be .0055 l^3 / second.^{3}is 20,000 liters. That is a big number. Using the formula Iderivedin post #2, pumping 1 liter/sec up 2 meters would require 2 x 9.81 ≈ 20 watts. What is the efficiency of your pumping system? Why don't you discuss its design? What is the "bucket" size and pitch on your Archimedes screw? What is its rpm? what is the gearing on your motor?

The aim is to design the screw, work out the forces and design the thickness of the shaft etc.

Maybe this is the wrong forum.

The efficiency of an archimedes screw is 84%.

The main aim is to design a system that aerates a septic tank.

usually the pumps are 80 watts, so we've decided to power the pump by using hydro power.

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