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PhantomAndy
05-23-2007, 01:57 PM
I'm just curious if anyone has either considered or done a concrete deck based solar heating system for their pool.

It occured to me about a year after I built my pool that the concrete deck is terribly hot, especially during the hotter parts of the summer. As I soaked my semi scalded feet in the water after skimming the pool, I wondered:

If before pouring the deck, and possibly even pouring a thicker deck to compensate for possible structural losses, if anyone had placed some bypass plumbing _inside_ the concrete deck itself.

This could produce a two fold benefit. First, of course the hot concrete could transfer heat to the water as it passed through the pipes embedded in the deck, and of course second, this heat transfer would yield some significant cooling to the deck itself making it more comfortable to walk on.

I considered the following facts while I pondered:

Adding the pipe/hose to the deck would compromise the structral integrity. This would create the need for additional structural enhancement of the concrete and possibly a thicker pour (thicker than the standard 4 inch residental used for most pools in my area.
Adding such a system would only be benefical during beginning and end of the swim season, and would have a reduced benefit during those times due to the sun being at lower angles, and not as hot.
There would have to be a bypass system in place to enable easy removal of this section of the plumbing during the hotter months, unless of course you wanted a 25000 gallon hot tub in August.
The piping/hose would need several drain points or some method to easily drain/blowout the system for winterizing.My interest is currently peaked on this topic because I'm considering adding some additional concrete decking (only went with the standard 4 foot deck at original build). It probably wouldn't be that difficut to build such a feature into the new decking, but I'm hesitant to be the first with such an expensive project.

JohnT
05-23-2007, 02:13 PM
I've considered the same thing. There is special tubing that is used for radiant floor heating systems that would probably be good for this if it can tolerate the chemicals. To me, the cooler deck would be as much of benefit as the warmer water.

PhantomAndy
05-23-2007, 02:41 PM
Totally agree - - - I really hope to find someone that has actually done this. . .

tphaggerty
05-23-2007, 02:54 PM
One of the moderators or big-time forum contributors has this, maybe CarlD??

There is definitely a company that makes solar heating built into decking material. Search the forum and/or the web, it is out there. Unless you have an AG, you have to plan it out as part of construction, not an add on!

PhantomAndy
05-23-2007, 03:11 PM
One of the moderators or big-time forum contributors has this, maybe CarlD??

There is definitely a company that makes solar heating built into decking material. Search the forum and/or the web, it is out there. Unless you have an AG, you have to plan it out as part of construction, not an add on!

Hmm - your right - here's one: http://www.pacificgunite.com/solar%20pool%20heating.htm

Interesting - but no data on how well it works. Looking for more details.

Maybe Carl will see this thread. I didn't find anything in a search of the forum.

tphaggerty
05-23-2007, 03:22 PM
Here's another:

http://www.sunworksco.com/indek_heaters.html

CarlD
05-23-2007, 03:25 PM
Ok, what I have is the same concept: Go to LeisureLiving.com and look at their FantaSea pools for the decking.

It's not concrete, it's a hollow plastic panel, 4'x2' and about 1" thick. It's hollow and has to be completely supported along all four edges (but not in the middle). There's about a 1" intake at one end and an output at the other end. The water snakes through it and that's how my solar deck works.

But I think a clever person could design an in-ground system using these panels. They come in gray as well as brown...You'd need a shallow trench 1' 6" wide to support the panels on concrete. You'd need cross pieces every 4 feet and room for the connecting hoses. And you'd need very good drainage of this trench.

But if you want to embed piping in concrete I suggest you check out installers of in-floor heating. A flexible tube is buried in the concrete near the surface to heat it. I can't think of any reason why that wouldn't work in a deck to absorb heat rather than emit it.

But you'd have to be VERY careful with you site prep to avoid damaging the piping if there's any settling. And you'd have to be VERY careful with your winterizing to get all the water and antifreeze in.

cleancloths
05-23-2007, 03:38 PM
I think the reason you don't see this is because of high cost. Plus it would be a nightmare to get all the water out in a climate where you have freezing winter weather.

My deck is some sort of light-weight concrete, not exactly sure what the PB used, but it only gets hot when the outside temp is closing in on 100 degrees. Otherwise it only gets warm and is always comfortable to walk on.