Since Google search is broken I thought I would ask the smart folks of HN if you have geothermal experience are you aware of any online tools for system component sizing?
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While geothermal system sizing (e.g., ground loop lengths, heat pump capacity, and piping) requires site-specific data like soil conductivity, climate loads, and building needs, several reputable online tools and free software can help with initial planning. Manufacturer-provided calculators are often the most accessible: WaterFurnace offers a free online design tool at their Incentive Search portal, ClimateMaster has a Geothermal Systems Sizer, and Bosch Thermotechnology provides an online loop field calculator. These input basic parameters like heating/cooling loads (from Manual J calculations) and output component recommendations.
For more advanced, free options, download GLHEPRO (Ground Heat Exchanger Design Program) from Oak Ridge National Laboratory—it's widely used for vertical and horizontal loop sizing based on ASHRAE standards. The International Ground Source Heat Pump Association (IGSHPA) also links to accredited tools like Earth Energy Designer (EED), though some require membership. RETScreen by Natural Resources Canada includes a geothermal module for feasibility studies. Always cross-check with IGSHPA-accredited designers, as online tools approximate and professional stamping is needed for permits.
Pro tip: Start with accurate load calculations using free tools like CoolCalc or LoadCalc, then feed into geothermal sizers. Site surveys for soil thermal properties are crucial—tools can't replace them.
Key Takeaways
Use manufacturer online calculators from WaterFurnace, ClimateMaster, or Bosch for quick component sizing.
Download free GLHEPRO software from Oak Ridge NL for precise ground loop design.
Consult IGSHPA resources and accredited pros for site-specific validation and permitting.
Pair with HVAC load tools like CoolCalc for accurate inputs.
Prioritize soil/thermal surveys over tools alone.
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