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Ground source W2W system, looking for suggestions
Hey all, I am going to be building a new 7200 sq ft shop in the near future and am looking to involve a ground source system to heat the place via radiant slab, and cooling is up in the air. I'm leaning toward an air handler in the basement and just a single central supply duct with open plenum. Heat loss comes in at 113,000, so possibly a pair of cascaded 5 ton 2 stage W2W heat pumps if my thoughts are correct- separate closed horizontal loop fields for each unit. I have piped quite a few heat pumps in commercial settings, but have had no part in design or a residential system in general so please bear with me if I'm in left field. I will have an LP boiler for backup, snowmelt, and to take advantage of dual fuel electric rates and will make provisions for wood boiler integration and thermal storage as well. I am looking for recommendations on equipment and am all ears if my cascaded 5 ton units and air handler for cooling idea is silly. Given the open nature of the shop, I've all but ruled out fan coils and unit ventilators and would prefer to keep all equipment in the partial basement (20x20 in one corner with office above, mezzanine above that) if possible to avoid damage. This system would need to be easily expandable, I plan on burying 2 additional loop fields for later in life when the house is built and have them stubbed into said basement to be utilized when ready. Piping to the house would be via precast walking tunnel as you often see in commercial buildings, ideally having no equipment in the future house besides air handler. Any information would be greatly appreciated; thanks!