I have gone through numerous previous posts and cannot find the answer to this. Please forgive me if I overlooked it.
QUESTION: How much power will a 1/3 hp or a 1/2 hp submerged well pump running at 70% capacity use? I cannot apply the figures I get from Grundfos/Franklin Motors/F&W for my situation. I am confident from reading previous posts that there are folks in this forum that are well versed in this.
BACKGROUND: I am building my home and plan to install a Climatemaster Model 049 - 4 ton geothermal heat pump. I am trying to determine which pump (open or closed loop) will be more economical for the heat sink since the water temperature and power consumption of the chosen pump clearly impacts the overall system EER/COP.
I have an abundance of good water at a depth of 50-55 feet here in NW Florida at year-round water temp of 68-69 degrees. If I utilize a horizontal loop 6' deep, my water temp will vary from the well water temp by approx 10 degrees. This does not take into account ground heat saturation during the long summer cooling load here in Florida which will further lower the efficiency of the closed loop. Will the increased EER/COP values at the more attractive well water temps be worth the added power consumption of the well?
Since I am already installing an irrigation well, the cost of installing an additional well for the water source is more competitive than installing a ground loop. I plan to use the irrigation well as the injection well to minimize the possibility of fouling the screens with the small amount of iron present (assuming air gets into system). I have been told by drillers in the area that pulling large amounts of water at a high rate of flow back out of the injection well should eliminate\reduce clogging of the injection well screens.
I am leaning toward the open system, but do not want the cost of running a well pump to make it more expensive. I am convinced we are on the precipice of vastly increasing utility costs and plan to live in this house for the rest of my life. What sayest thou?