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Old McDonald

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Posts: 66
Reply with quote  #1 

I will not make this post any longer than necessary by adding information about aquaponics. If you are not interested I do not want to waste your time reading a longer post than necessary. If you are interested but do not know about aquaponics then you can Google.

As an experiment I set up a 100 gallons fish tank in late summer with two growbeds alongside and at a slightly higher level. I pump from the tank to the growbeds on a 15mins to the hour basis. I made a bell siphon to drain the beds back to the tank. It works brilliantly. The beds have a few overwintering plants in them, but my idea is to grow summer veg and save on water (which is recycled and not lost as in a ground garden) if the experiment is successful. Time and water shortage are a problem when my olive and almond trees need so much water and attention. I will be making an irrigation pond next Spring and intend to use this for fish, so could set up growbeds for that on a much bigger scale, or use floating growbeds. Almost all of the irrigation area drains back into where I will be making the pond so any leaching of nutrients through the drainage of water back to the ponds will also be recycled.

In my experiment I have the tank set behind a low wall that forms the entrance to an otherwise open, but roofed, area prior to entering the wine cellar. This wall protects the tank from exposure to the sun in the summer when the water would be overheated, but is ideally situated to catch the winter sun. Obviously this leads to thoughts of using solar gain to slightly raise the winter temperature of the fish tank through a warming (not heating) coil in the tank. This would keep the fish active, feeding and growing instead of just marking time for a few months.

Anybody have experience of doing this, or thoughts on how best to proceed? What area of collector do you suggest? I can fit the height/width to suit. Temps rarely drop to freezing point. I would not make any allowance for cloudy days, the water temperature would reduce naturally, and that is acceptable. Pex is unobtainable locally and I do not want to go to the cost and hassle of copper. I am willing to chance some irrigation pipe – this might influence suggestions for the size of collector. It is a small scale experiment and I want to keep costs to a minimum.

stmbtwle

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Posts: 2,858
Reply with quote  #2 
Irrigation pipe seems to work well at the lower temperatures you're considering, and the price is right. Not sure what the max temperature is but as long as it doesn't stagnate you should be good.

I would go modular with the collector, start with a 4x4 or 4x8 and add more if/as needed. Easier to build/move/repair too.

This might be of interest:
http://plasticpipe.org/pdf/tn-11_temperatue_limits_for_thermoplastic_non_pressure.pdf

Finding out what a particular tubing is made of could be an issue, you could put a small piece in an old pot and boil it, and see what happens.

__________________
Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Old McDonald

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Posts: 66
Reply with quote  #3 
Thanks Willie. Before posting I had been thinking about 4x4. Keeps the size of the collector down - and the volume of heated water. I could play around with the amount of pipe coiled in the fish tank (a circular ex-wine fermenting tank) so that it does not heat too much. I could keep an aquarium pump running dawn to dusk at little cost. A PV panel to run it is also a possibility. Just ideas at this stage, but if fish can be kept growing through the winter it greatly increases the production of the tank. Warmer water for the plants will also increase their growth. It could even pay to set up more in addition to the proposed irrigation pond. Vegetables plus fish for a little water pumping seems a good idea to me.
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