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Hybrid ground-source heat pump (HyGSHP) systems are growing more prevalent, but there continues to be a need for additional information on the design and operation of these systems. This project monitored three actual HyGSHP systems, both in heating- and cooling-dominated buildings, to benchmark (and improve where necessary) existing models and operational practices for these systems, and measure the cost effectiveness of these systems. Results demonstrate the costeffectiveness of the general hybrid strategy, from a life-cycle standpoint, in comparison to other ground-source andconventional systems. Results also detail lessons learned in equipment sizing, control, and pumping design.

Citation: ASHRAE Conference Papers, Montreal, QC