I am getting ready to start a DIY geothermal project and I want to double check something with you guys here.
My system will be closed loop horizontal with SDR11 3/4" pipe. There will be 6 loops of 500' each for a total of 3000' plus my 40' of 1 1/4" header. I will have a mixture of 25% Dowfrost(glycol) to 75% water. As far as the ft/head, there will be basically no difference in vertical level as my pipes will exit via my basement walls. I want to size my circulation pump correctly. My system has a 2 stage compressor and at full load the capacity is 5.5 tons. Figuring for 3.0gpm per ton I need about 16.5 gpm. What size pump is recommended? I am looking at the Grundfos U26-99f. This might be a little oversized but I want to be certain.
Any thoughts or suggestions would be appreciated. ST.