Photovoltaic with solar energy storage augmenting heat pump to achieve carbon zero

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This presentation reports on an experimental augmentation system for ground source heat pumps using solarim style panels to recharge the ground, thermally. The system is installed on a house in Nottingham, England. Real-time, diurnal and inter-seasonal solar charging restores the energy level in the earth, which prevents progressive frosting of the borehole zone.
This presentation won the Outstanding Paper Award at the 2012 CIBSE ASHRAE Technical Symposium in London.