🌍 ASHRAE Geothermal Vertical Boreholes (150-250 ft/Ton in Granite/Clay), HDPE U-Tube

Geothermal Ground Borehole Loop Calculator

Size vertical closed-loop ground heat exchangers (GHEX) for commercial geothermal Ground-Source Heat Pump (GSHP) systems under IGSHPA & ASHRAE standards: calculate total borehole footage (150 to 250 linear feet of 5"-6" drilled hole per ton based on rock thermal conductivity and borehole thermal resistance), thermally enhanced grout, and geothermal drilling profits.

1. Project & Operating Inputs

Geothermal HVAC Capacity (Tons e.g. 120 TR Geothermal System)

Ground Thermal Conductivity (BTU/hr-ft-°F e.g. 1.45 High-Conductivity Granite)

Customer Bid Price for Drilled, Grouted & Headered Borefield ($)

Rotary Mud Drilling, 1-1/4" HDPE U-Tubes, Thermally Enhanced Grout & Crew ($)

2. Financial Breakdown & Yield

IGSHPA GEOTHERMAL BOREFIELD

Turnkey Geothermal Borefield Profit

Geothermal Drilling Contractor Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost