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 Post subject: Solar pool tubing
PostPosted: Apr 26th, '18, 10:47 
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Anyone know if solar pool tubing is fish safe? Thinking it may be a viable way to increase water temps over winter.

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 Post subject: Re: Solar pool tubing
PostPosted: Apr 26th, '18, 11:26 
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try it and let us know..... :D , actually good idea, and you'll need it up in the hills.

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 Post subject: Re: Solar pool tubing
PostPosted: Apr 26th, '18, 17:32 
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Ive used 19mm drip line with good results run a small separate pump on a timer .

Problem I can see with the pool tubing is way more resistance and power needed to push water through if you have it up on the roof you will need a powerful pump.

I use 300m of 19mm poly on my roof for heating our small swimming pool I use a MD55 pump for that.


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 Post subject: Re: Solar pool tubing
PostPosted: Apr 28th, '18, 19:10 
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Anyone know if solar pool tubing is fish safe? Thinking it may be a viable way to increase water temps over winter.

might depend on the brand/type.
If it is basically poly pipe then you will be fine.

Often black poly pipe 19mm-25mm is a cheap effective option anyway and much hardier to leave at ground level (as Terra notes/shows).

May have to watch temperature though since the temps can vary a lot with sunshine hours vs. cloud.
If you have a large water volume less of an issue.

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 Post subject: Re: Solar pool tubing
PostPosted: May 2nd, '18, 06:57 
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I havn't never heard or thought of that before. Think I should do a little bit of research on that!


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 Post subject: Re: Solar pool tubing
PostPosted: May 3rd, '18, 12:05 
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Once it's pumped to the highest point and starts running back to tank level it will have a bit of a syphoning effect, the total head resistance will be less than the highest point in the system. The pump chosen would still need to have the necccessary head to reach the highest point in the system but should run at a better efficiency once the water starts running downhill.

A bigger impact on heads will be the friction loss from such a long pipe run, some thought may need to be given to setting it up so that it branches into multiple shorter lengths of poly, then converges back into a single exit point.

In this system the biggest issue will be ensuring that water flows evenly through all the pieces. There's negatives to everything...

If I were to do this on a corrugated iron roof I would cut exactly matching lengths of poly and have them run up the tin roof in the valleys with the top of the lengths all matching (to try and keep the flow even)

If you're not worried and doing it on the cheap then 19mm black irrigation poly. If you're worried about the plastics and have a bit more cash then I'd use 50mm metric top and bottom with lengths of 20mm metric running between. Tapping saddles and end connectors would be cheaper than using T's. To secure it you could
take the screws out that hold the sheets to a purlins, put some galvanised strapping over the top, then running the screws back in. Double check the valleys aren't too deep or shallow, might need to step up to 25mm metric if the strapping wont hold it tight.

An option to prevent this radiating heat out of the system when the pipe isn't in the sun would be to position a solar panel on the roof to power the pump, the pump would then only run when the pipe was being heated. A thermo-electric switch (perhaps coupled with a solenoid) would be handy to prevent overheating the tank.


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