Started to think about Reynolds numbers of variable speed pump. How are the systems working when the pump is on low? Are the Reynolds numbers low when the pump is set on low? Anyone have any good data an install with low Reynolds numbers? Can more pipe in the ground make up for a low Reynolds number by spending more time in the trench transferring heat. How are variable speed pumps able to have good performance with their low Reynolds numbers (or do you design a loop field differently)? I searched but could not find anyone talking about this subject. Recently installed a 3 ton CM TE30 with a horizontal loop field. (6) trenches 4' wide trenches 100' with 800' of slinky 3/4" per trench 8' deep. I know my Reynolds number are very low (have valves to close loops if needed). Added the extra capacity for another Geo pump in the future.