Closed system-conductive heating of pool with solar Answered
Hi clever folks,
We've been reading the Instructables for making solar hot water systems to heat a swimming pool (4000 litres) in our very shaded backyard (in Australia). We like the idea of using a coil of black poly pipe or garden hose laid out in the sun to heat up and then pumping this through the pool during the day, but the thought of bacteria building up in the pipe has struck fear in us! Sooooo....we may need another plan. I've read way too much on Legionalla and now think it would be safer to have a closed system.
What we had in mind is a network of thin poly pipe either in 2D or 3D that would float (or be weighted slightly to sit in a good portion of the water "column"in the pool) and connect this to a long length of black polypipe that would receive solar heating. Obviously this would be a heating system that takes place when no one is using the pool (i.e. when the kids are at school). We'd keep a pool blanket on to insulate it too. When someone wants to use the pool, which would typically be in the evening for us, we'd remove this so-called radiator. Hopefully it would not be too heavy as the thin poly pipe network will be filled with water.
Hmmm...so tempting to try it this weekend. We just would love to hear from folks that have knowledge to share on these topics.