Seminar 61 -- How Deep Can We Go? Designing and Drilling Deeper Geothermal Systems

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Space limitations and other constraints are forcing engineers to design deeper boreholes for ground-source heat pump systems in buildings. There are advantages and disadvantages to doing deeper than typical boreholes, and there are specific limitations on depth in some circumstances. This seminar covers these considerations, both through calculation and design examples, as well as practical lessons learned from the field. The new, deep/ultradeep borehole, hydrostatic differential calculations from the 2015 ASHRAE Applications Handbook are also presented. The latest developments in non-cementatious grouts are introduced to help designers avoid pipe collapse in deeper boreholes without sacrificing performance.

• Installation Practices and Hydrostatics of Deep Boreholes
  Ryan Carda, P.E.

• Swedish Practices and Experience with Deep Boreholes

  Jose Acuna, Ph.D., Associate Member
  
  
• Evolution of High and Low Density Geothermal Grouts
  Charles P Remund, Ph.D., Member

Run Time: 90 mins

Citation: ASHRAE Seminar Recordings, 2016 Annual Conference, St. Louis, Mo