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GROMIT project: GROund coupled heat pumps MITigation potential

GROMIT project: GROund coupled heat pumps MITigation potential Partner 6, Reading Borough Council Anne Verhoef , on behalf of the GROMIT team Soil Research Centre, University of Reading. GROMIT project team. UoR/NCAS-Climate (Land surface modelling & Fieldwork):

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GROMIT project: GROund coupled heat pumps MITigation potential

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  1. GROMIT project: GROund coupled heat pumps MITigation potential Partner 6, Reading Borough Council Anne Verhoef, on behalf of the GROMIT team Soil Research Centre, University of Reading

  2. GROMIT project team • UoR/NCAS-Climate (Land surface modelling & Fieldwork): • Raquel Garcia-Gonzalez, Bruce Main, Pier Luigi Vidale, Anne Verhoef • Nottingham University (Modelling of GCHPs): Guohui Gan, Yupeng Wu • BGS (Groundwater modelling): Majdi Mansour & Andrew Hughes • CEH-Wallingford (UK 1 km driving data): Eleanor Blyth & Jon Finch • EarthEnergy Ltd (GCHP expertise): Robin Curtis • Aim: To investigate and optimise the CO2 mitigation potential of horizontal • GCHPs under current and future UK environmental conditions

  3. Infiltration Rates / Evaporation Energy balance/ground water level; (vary in time and space) Water (vapour) flux, induced by heat extraction/rejection Thermal regime Thermal soil properties Soil water freezing/melting GCHPs and environmental interactions Key variables: soil moisture content and soil temperature Primary source of energy, Rn E, evaporation H, sensible heat flux Heat pump Top Boundary condition Rn –(H+LE) = G G, soil heat flux Net Thermal Recharge ~1.5 m Horizontal GCHP Heat extraction / Cooling Ground water Flow Lower Boundary condition Fh=0 (T=constant) Largely affected by climate, soil texture & vegetation Diagram: Heat and water exchange processes near GCHP 3

  4. Project approach • Model development (combined Land surface-Groundwater-GCHP model • Experimental campaigns (UK field sites) • Model simulation • Driving variables (UK 1 km grid) • Verification • Sensitivity - Varying model parameters • Climate change impact – COP under future environmental conditions • Climate change scenarios (UKCIP) • Dissemination

  5. Land surface model

  6. UK texture maps The National soil map, NATMAP (NSRI) Soil texture • Soil properties such as: • Dry bulk density • Hydraulic properties • Thermal properties

  7. UK driving variables Air Temperature (K) 1 January 2003 Rainfall Rate (kg m-2 d-1), 1 January 2003 Courtesy of: Tongfei Zhang, CEH-Wallingford

  8. Field measurements • 2 Profiles: • GSHP profile • Reference profile • Measurements: • Bulk density • Water retention curve • Soil temperature • Soil moisture content • Thermal properties) • - Inlet/outlet data slinky Cooling near the slinky due to heat extraction… how will this affect the water and heat transfer and hence the performance of GSHP

  9. Some results

  10. Conclusions/Outlook • Long-term performance of horizontal GSHP systems can only be assesed through fully mechanistic models • This also allows the effect of Climate Change to be taken into account • We aim to apply the GROMIT approach on a European-wide scale in a follow-up project

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