Awesome info AC. I had seen that table of thermal conductivity some where. And you are totally right, flowing water is much much better at giving off its heat. That is why coaxial coils can be so short, and why you have to pay a arm and a leg for all the DX copper. But water being so low also is what makes a pond a awesome thermal storage area.
I have no idea how much flow is at the bottom of the pond. I know that the great exchange will make it move some plus the pond is full of large fish, all that swimming has to move lots of water.
Great articles on the solar stuff to. That is a project for next year.
I got a quote on 150' of 3/4, 500' of 3/8 and 150 of 5/8. It's was right at $1,000. But that was from only one place. After the building of the coax coils and the extra pump cost doing pump and dump is not going to save to much money. And if I'm going to have to dig up my yard to the pond anyway it's not going to save me much work.
I did make sure that DX could handle the overall 30 foot head and it for sure can. Should move the oil around nicely.
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