I saw a several designs @
http://www.gullsolar.com/index.php?page ... cc41db8ab7
http://ffaat.pointclark.net/blog/index. ... erendipity[csuccess]=moderate
I had a few questions in regards to bulding my solar coil heater and thought I might get some advice here.
Application is on 12'x24'x52'' Intex above gound pool. Plan on everything you discussed in above site with following changes;
1. Coil (250') is to be mounted flush on roof. We are in San Diego CA and the roof is always 90F, even on cloudy days.
2. Given the head pressure of 1/2" tubing going up 20ft to the roof I'm not sure if the main pool pump, 2500gph Intex is the answer. Is that too much strain on the pump? Too much flow? Thinking of buying a hi-pressure, low volume elec. booster pump so as to not blow out the main pump and save on electricity. Check valve between booster pump and roof so when pump shuts off water doesn't fall back towards pool.
3. The booster pump will take a suction off the pump inlet as this is lowest point (4 ft.) below the pool level and should provide constant inlet pressure to the booster pump so priming is never needed.
4. The booster pump to be mounted on a timer, booster pump comes on for 30-45 minutes, push hot water to pool
and refreshes with cold water from pool to coil. Pump comes on every 1.5 hrs. from say 11am to 5pm.
a. Can I tie the heater return line into the main pool pump discharge piping so it doesn't look ugly hanging over the top of pool? Will the small amount of return flow be able to overcome 3ft of 2" piping going from main pump to outlet pool jet (jet is right at pool water level)?
b. What kind of automatic air bleeder valve can I put into the coil on the roof? I know with 20 ' of tubing going to a roof I will have air lock if I don't have a bleeder. Auto store??? Have not sen anything at Home Depot.
Appreciate any ideas or support.