[Greenbuilding] [BULK] Re: Treadle-powered water pumping (was [re:reflective heat shield/bike powered pump]

[Lawrence Lile]

> Despite Lawrence's contempt for human power, four minutes every two
days seems doable to me.



 

Humph.  ;-)

 

Lawrence Lile, Professional Skeptic

 

________________________________

From: Reuben Deumling [mailto:9watts at gmail.com] 
Sent: Monday, November 12, 2007 7:10 PM
To: ArchiLogic at chaffyahoo.ca
Cc: Lawrence Lile; GB REPP
Subject: [BULK] Re: [Greenbuilding] Treadle-powered water pumping (was
[re:reflective heat shield/bike powered pump]
Importance: Low

 

I asked a friend with help on this very calculation a few months back. I
wanted to know how long it would take to lift 50 gallons of water 30
vertical feet, assuming I could put out 75W for this amount of time with
a setup such as you describe. Despite Lawrence's contempt for human
power, four minutes every two days seems doable to me.

         9.8 Newtons                 1 Joule      1 W-s    1 

180 kg * ----------- * 10 meters * ------------ * ----- * ---- = 235
seconds 

              kg                   Newton-meter   Joule   75 W 


Reuben Deumling

On Nov 12, 2007 4:49 PM, Robert Tom <ArchiLogic at yahoo.ca> wrote:


Maybe someone who is familiar with the capacity of such pumps can do the
arithmetic to see how many equivalent-kilometers one would have to pedal
to provide the revolutions necessary of a 700mm diameter bicycle wheel
to 
turn the shaft of the impeller at electric motor speed to move, say, 200
litres of water.

I have an inkling that it'd take less time than carrying two 20 litre
pails back and forth. over a distance of say, 30 metres.