h a l f b a k e r yAssume a hemispherical cow.
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We recently bought a small inflatable pool that holds about
4m3 of water. Instead of regular pH measuring and using
pool chemicals I decided to empty the pool every 3 days
and fill it with fresh water from our well - it's much
cheaper and safer for kids.
Now the problem is that the well water
is cold (14C) and
the pool is not usable until it gets about 8 hours of strong
sunshine. After 3 days we flush the gained heat (30deg.C
water) down to the drainage.
My half-baked idea:
- use a regular counter-flow heat exchanger that recovers
heat from the old water being flushed down and pumps the
heat to the fresh water that fills up the pool
- use something like a condom/weather balloon connected
to the fresh water inlet nozzle inside the pool to separate
the fresh water from the old waste water
This way I could fill the pool with fresh water even every
day and the water would never be too cold for the kids.
[link]
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Sounds good except for the weather balloon thing. First, it sounds difficult to make it work right and I think you'll get a lot of old water around the corners that doesn't get emptied out. I assume since it is a small pool, it was pretty cheap. Why not just buy a second pool, and use the heat exchanger while filling that pool and emptying the other pool? Alternate between pools every three days. That way you can scrub the pool that was just emptied and/or just leave it in the sun for a few hours then store it dry to reduce algae growing on the pool that sticks around after the water is changed. |
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Of course if you're doing that, you could just fill the other pool a day before you empty the other one... |
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Get the kids to pee in the pool enough to warm it
up? |
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" condom/weather-balloon " |
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I'll have you know it took quite an effort. |
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Quelle horreur! I remember seeing a kid trying to
blow up a "balloon" he found, when we were kids.
Even at age 7, I knew he had to put it down and
RIGHT NOW! |
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