730093Direct Exchange CO2 Ground Source Heat Pump SystemClosedLegacy RDA Grant for R&DInnovate UKThe aim of the project is to prove the concept of a novel ground source heat pump (GSHP) for small domestic applications. The innovation is based on: - A novel “drilling” equipment based on pile driving, which will dramatically cut the installation cost and footprint. - A novel ultra-efficient GSHP configuration, based on a direct expansion coaxial copper tube heat exchanger filled with the most environmentally benign refrigerant, carbon dioxide. The resulting benefits for the system will be: (a) low-cost; (b) easy to install; (c) high-efficiency; (d) low-footprint; (e) suitable for retrofitting at minimal cost and disturbance; and (g) environmentally friendly by dramatically reducing CO2 emissions; (h) high output water temperature for the heat distribution system. The deliverables will be: • A prototype for our lightweight pile driver. • Operating guidelines for the pile driver in multiple soil conditions. • A proof of concept for the Calorterra GSHP. • Field tests results for the Calorterra GSHP concept, and preliminary idea of performance for various heating loads and soil input factors. • At least two patents protecting our concept