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Lisa Meline is Meline Engineering’s principal engineer and owner. She has 25 years of mechanical engineering experience and over 30 years of experience in the construction industry. She is a licensed professional engineer in four western states and a Certified Geoexchange Designer. She is also Standards Sub-committee Chair for ASHRAE TC6.8, Geothermal Heat Pump and Energy Recovery Applications, Chair of IGSHPA’s Standards Committee, and recently served as Special Expert on the IAPMO Uniform Solar Energy and Hydronics Technical Committee. Meline is an ASME Fellow and one of the founders of the California Geothermal Heat Pump Association.
Why do ground loops in moist soils sometimes perform better than expected? What ground loop design tactics can address building system imbalance? Engineers need to take more responsibility for their full GSHP designs, and these questions are a good place to start.
With a little guidance on ground-source heat pump design temperatures and a few rules of thumb for ground loop flow rates, most engineers are pretty comfortable designing the building side of a ground-source heat pump (GSHP) system.
Uniform Solar Energy and Hydronics Code (USEHC) contains some requirements that may be inappropriate given certain conditions, climates, or simple designer discretion. That’s not a problem … unless your locality or state adopts USECH language as binding. Dig into the problem and note a timely opportunity to avoid having these issues set in stone for another few years.
As early as 3000 BC, civilizations began to create codes for public order and safety. The Code of Hammurabi, the old “eye for an eye” law many are familiar with, also included laws for safe building construction.
