BEopt's help specifies that GSHP are modeled as vertical bores rather than horizontal fields, but are these open or closed-loop? I shouldn't think it matters in most cases, since this parameter is used to determine the equipment's equpment's rated efficiency (which one sets directly in BEopt), efficiency, but I am curious.

BEopt's help specifies that GSHP are modeled as vertical bores rather than horizontal fields, but are these open or closed-loop? I shouldn't think it matters in most cases, since this parameter is used to determine the equpment's rated efficiency, but I am curious.