Re: [PSUBS-MAILIST] Math wiz needed

[Alex <spm2@nomad.ignorelist.com>]

1 US gallon = 231 cubic inches
So 346.5 cubic inches of water in 1 minute. 5.775in^3 in a second. 94.635
cm^3/sec.

1 Psi = 6894.75729 Pascals (Newtons / m^2)
So 

So 9PSI = 62053 N/m^2. 62053 N/m^2 * m^2 / 10000cm^2 = 6.2053N/cm^2

There are 94.635 cm^3 to fill up. Pushing 6.2053N on one cm^2. That's 0.946
meters to go in one second.

1 N * m = 1 Watt

0.946m * 6.2053N = 5.87 Nm = 5.87 Watts of water
motor is using 120W so efficiency is 0.0489

On 11-Feb-2012 David Hoffman wrote:
> Gary,
> Seems off but I am getting 3.9%._ Maybe see what other people come up with._ 
> 
> 
> David Hoffman
> 
> 
> 
> ________________________________
>  From: Gary Sluis <gary@michiganoffshore.net>
> To: personal_submersibles@psubs.org 
> Sent: Saturday, February 11, 2012 1:50 PM
> Subject: [PSUBS-MAILIST] Math wiz needed
>  
> 
>  
> Can anyone help me with this equation?
> The power input is 24 vdc, amps 5.0 the output is 
> 1.5 gpm at 9 psi. What is the efficiency_of this 
> pump?

-- 
Mailed on 12-Feb-2012.



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