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How much tubing is too much? - Page 2

post #11 of 16
Thread Starter 
Quote:
Originally Posted by pauldovi

Let me know if this all makes sense.
All of it?

No, I maybe absorbed about 30% of that LOL, but I did save it into .pdf so I can have it available (I am at work, and I don't do my best thinking at work) LOL


But what I really needed to know was how to determine flow rate for differing pipe lengths. If I need to have a semi-constant 3 liter per minute flow rate (for example) and my pump puts out 6 liters per minute, how much drop does 1' of line with 2 "U" bends in it give me?

If I know that a "U" bend drops my flow 10%, and each 1' section of line drops it by 5%, then I can take that and plan out my routing and design (Man, did I come up with some great ideas last night, but they are secrets until I implement them )

Man, I think this project is going to hit $300
post #12 of 16
hook it up with a bucket and stopwatch and measure the flow for 30 sec (x2=x )- Its prolly less time consuming than putting up a missle with those calculations. You wont loose to much from tubing length, just keep the conduit as large as possible so your not battling the head pressure of your pump, especially if youve got a 1 meter or so rise in the circuit up to your heat exchanger
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post #13 of 16
Quote:
Originally Posted by Thumper
All of it?

No, I maybe absorbed about 30% of that LOL, but I did save it into .pdf so I can have it available (I am at work, and I don't do my best thinking at work) LOL


But what I really needed to know was how to determine flow rate for differing pipe lengths. If I need to have a semi-constant 3 liter per minute flow rate (for example) and my pump puts out 6 liters per minute, how much drop does 1' of line with 2 "U" bends in it give me?

If I know that a "U" bend drops my flow 10%, and each 1' section of line drops it by 5%, then I can take that and plan out my routing and design (Man, did I come up with some great ideas last night, but they are secrets until I implement them )

Man, I think this project is going to hit $300
Here is the equation for how much length affects your system:

As you can see, the radius of the tube is the largest factor in the flow rate of a tube.

I am not sure where you came up with the 10% / 5% thing.
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post #14 of 16
Thread Starter 
Quote:
Originally Posted by pauldovi
Here is the equation for how much length affects your system:

As you can see, the radius of the tube is the largest factor in the flow rate of a tube.
Ok, I will work with that formula. Thanks. I was thinking 1/2, but might be too big for my design, so 3/8 may be what I use, especially as that is the size of the res and pump nozzle's and the nozzles on the APOGEE water block.

Quote:
Originally Posted by pauldovi
I am not sure where you came up with the 10% / 5% thing.

Just used for example. Guess I should have said x% and y%


I'll be starting this project in May (between moving the next 3 weeks, and vacation end of April, no time or money till then) and I will post my progress and final results.
post #15 of 16
[QUOTE=Thumper]Ok, I will work with that formula. Thanks. I was thinking 1/2, but might be too big for my design, so 3/8 may be what I use, especially as that is the size of the res and pump nozzle's and the nozzles on the APOGEE water block. QUOTE]

The Apogee has 1/2 and 3/8 fittings. And Fsrdaddy told me that his resivoir is 1/2 as well. There would be a large drop in performance going from 1/2 to 3/8, so I reccomend sticking to the 1/2.
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post #16 of 16
Thread Starter 
Quote:
Originally Posted by pauldovi
The Apogee has 1/2 and 3/8 fittings. And Fsrdaddy told me that his resivoir is 1/2 as well. There would be a large drop in performance going from 1/2 to 3/8, so I reccomend sticking to the 1/2.
Yeah, he alreayd modded the heater core for 1/2 lines. And you're right, I didn't notice that the APOGEE comes with both. I'll have to go down to the store and hold some 1/2 in my hands and see. As you noted before, I am going for a balance of performance and looks. I may not be able to achieve the bends I want with 1/2 copper tubing.

I found a place online that sells soft copper tubing that's refrigeration grade between .030 to .032wall thickness for $1.23 a foot (for 3/8) and they take 20% off if you buy 10ft.
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