A small pump for a pool!!!!

[KH971]

Yeah I said it. I put a 27' above ground pool for my kids and I am going to use about 200 ft of black pipe and make a solar heater to heat the water. The problem is either I siphon the water out of the pool with a pipe and use a pump to push it back in.
How about a Mag 5? What do you guys think?

 

[2004jetta]

Not sure I understand you, are you trying to size a pump to feed 200' of pipe and have it dump back into the pool? If so a mag 5 is no where near powerful enough. What gph does the solar heater need?

 

[unhpian]

If you keep the 200 feet of black pipe horizontal, your only losses will be due to friction, and you can use something like this http://www.engineeringtoolbox.com/hazen-williams-water-d_797.html to calculate the headloss due to friction. My reccomendation would be to keep the flow low (something on the order of 60 GPH) - because you're just heating the water, not filtering it, there's not much advantage in having a higher flow- the amount of heat entering the pool will be the same if it's at 600 GPH or 60 GPH. With the lower flow, you will have lower head pressure. Using rough numbers, if you have 200 ft of 1" ID smooth plastic tubing and we assume a flow of 2 GPM, your head loss would only be ~ 1 ft. It looks like the Mag 5 can push ~60 GPM at 0 ft head, so the pump can do it - it's just a matter of what the final flow will be. In this case, the headloss will be a function of the flow, with the flow than being a function of the frictional headloss because the Mag 5 is not a constant-flow pump - the output varies with head pressure. The calculations get messy, and I don't feel like breaking out my fluid mechanics book - but it should settle into some equilibrium where the flow is low enough that the frictional headloss isn't too much for the pump. Also - I'd suggest getting tubing in 1" diameter or bigger, because if you play with calculator, you will see as the tubing diameter decreases, the frictional losses significantly increase.

 

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FWIW,

i seriously think 200 ft. of pipe isnt going to put a dent in your heating needs, no matter what size pump or diameter of pipe
you use.

i have solar heating on my pool (in Florida) and my pool is only
14x25x7feet deep, and it takes 7 10'x5' panels on my roof and a 2hp pump running threw 2in pipe to keep me warm till mid Nov.

your looking at a footprint of 10'x 20inches( if you use 1 inch pipe)

i dont think its going to cut it, not even close.

Chris

 

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<a href=showthread.php?s=&postid=14994111#post14994111 target=_blank>Originally posted</a> by 2004jetta
. What gph does the solar heater need?

he wants to use the pipe AS the heater
(see above)

 

[2004jetta]

ooo, might want to look into a much thinner pipe than PVC. The thinner the pipe the less it will absorb i think??

 

[Imzadi]

But how big is the sump? Is there a DSB? T5 or MH?

 

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<a href=showthread.php?s=&postid=14999884#post14999884 target=_blank>Originally posted</a> by Imzadi
But how big is the sump? Is there a DSB? T5 or MH?

he is talking about heating a POOL Not a tank.....