2cv
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| posted on 2/7/10 at 08:01 AM |
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Can anyone tell me how to calculate the conductance of 28mm copper pipe for water please?
I need to know how much water can flow through the flow and return pipes on my mid-engined car and wondered if anyone has a formula for the
calculation.
Any help would be gratefully received,
Thank you.
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BenB
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| posted on 2/7/10 at 08:02 AM |
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Won't it depend on how much pressure the water pump is making?
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coozer
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| posted on 2/7/10 at 08:02 AM |
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All depends on you pump rate, temp and pressure.
Best way is to have a look on the donor and wee what it uses IMO.
1972 V8 Jago
1980 Z750
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balidey
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| posted on 2/7/10 at 08:03 AM |
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quote:
Originally posted by coozer
Best way is to have a look on the donor and wee what it uses IMO.
I'd need to drink loads to be able to do that 
[Edited on 2/7/10 by balidey]
Dutch bears have terrible skin due to their clogged paws
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BenB
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| posted on 2/7/10 at 08:07 AM |
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http://www.copper.org/publications/pub_list/pdf/copper_tube_handbook.pdf will give pressure losses over lengths of pipes of various sizes but that
would be water.
Add coolant and temperature and it'll all go a bit wonky.
28mm pipe flows a lot, I doubt it'd be a problem really 
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big-vee-twin
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| posted on 2/7/10 at 08:14 AM |
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Here's the formula
Bernoulli's
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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2cv
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| posted on 2/7/10 at 08:31 AM |
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Here's the formula Bernoulli's
I don't think it gives flow.
Ben, Pressure after a certain point will make no difference to the flow which will be dependant on the tube diameter and length.
Coozer My donor was FWD. My car is a Midi.
Thank you for your replies
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v8kid
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| posted on 2/7/10 at 09:01 AM |
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Not really.
Sure the laminar flow will have a terminal flow rate but for turbulent flow there is not the same ceiling and we want turbulent flow 'cos it
scours and increases heat transfer. OK the backpressure increases but are we worried?
I would consider 32mm ally tube as a unofficial standard cheaply available, as pointed out by - damn just had a senior moment- from B&Q tv ariel
pipe.
Will transfer more heat than your heart could desire - around 50kw laminar and oodles more turbulent
You'd be surprised how quickly the sales people at B&Q try and assist you after ignoring you for the past 15 minutes when you try and start a
chainsaw
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jossey
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| posted on 2/7/10 at 09:22 AM |
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http://www.plumbingsupply.com/flow_charts_for_pipes.html
this should give you an idea.
if you know the flow rate of your current 15mm setup its around 50% more at best.
if its for a shower which is the normal reason people are upgrading pipe then just calculate on the 15mm pipe.
use a 10 ltr bucket to calculate litres per min. gets you flow rate. x 50% gives you a rough idea.
if i got wrong end of stick sorry.
it does state on the site that it can take nearly double but thats if the pressure is super high.
dave
[Edited on 2/7/10 by jossey]
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