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Old 11-25-2009, 11:44 PM   #11
ftlstrings
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but what is the difference in surface area to volume?

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Old 11-26-2009, 12:45 AM   #12
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Originally Posted by ftlstrings View Post
but what is the difference in surface area to volume?
For one thing both 3/8" and 1/2" soft copper tubing of 50' length both have 0.032" wall thickness. 3/8" has an ID of 0.311", 1/2" an ID of 0.436" of cross sectional area. This makes 1/2" at 1.965 times more cross sectional area than 3/8". Which one would you rather have as back pressure and flow on your pump? 3/8" for $83.88, 1/2" for $109.99 as an example off this site; www.plumbingsupply.com/coppertubing.htm as an example. Go to "C" for the copper pipe, soft tubing section, look at their chart.There must be other sites that are cheaper just look around. Nothing worse that "I should of got the bigger tubing" question after your build. It takes more pressure to pass liquid thru 50' of copper tubing with 3/8" than 1/2" tubing, the math is there. Hope this helped you decide.
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Old 11-26-2009, 01:40 PM   #13
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Not too much cheaper, but the cheapest source I know:
ICS Industries 100 foot of 1/2" for 92.54

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Old 11-26-2009, 11:04 PM   #14
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Not too much cheaper, but the cheapest source I know:
ICS Industries 100 foot of 1/2" for 92.54

Cheers
I like the plumbingsupply due to their charts in my files showing true ID measurement specs not to purchase from them unless the only company as they are on the high side in prices. To see tubing size without the ID measurement shown as well wall thickness for heat transfer i'll move on.
That was an example just to show the cross sectional area differences.
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