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GROMIT project: GRO und coupled heat pumps MIT igation potential

GROMIT project: GRO und coupled heat pumps MIT igation potential. NERC research grant. Anne Verhoef on behalf of the GROMIT team Department of Soil Science, University of Reading. GROMIT team. UoR/NCAS-Climate (land surface modelling & fieldwork):

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GROMIT project: GRO und coupled heat pumps MIT igation potential

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  1. GROMIT project: GROund coupled heat pumps MITigation potential NERC research grant Anne Verhoef on behalf of the GROMIT team Department of Soil Science, University of Reading GSHPA meeting, 21 January 2010, Milton Keynes

  2. GROMIT team • UoR/NCAS-Climate (land surface modelling & fieldwork): • Raquel Garcia-Gonzalez, Bruce Main, Pier Luigi Vidale, Anne Verhoef • Nottingham University (modelling of GCHPs): Yupeng Wu & Guohui Gan • 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 GSHPA meeting, 21 January 2010, Milton Keynes

  3. GCHPs and environmental factors Key variables: soil moisture content and soil temperature • 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 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 Courtesy of Raquel Garcia, Reading University GSHPA meeting, 21 January 2010, Milton Keynes

  4. GCHP-related technical & design factors • Type of horizontal GCHP • Spacing of loops • Installation depth • Back-filling material • Fluid in HE • Pumps Load m Pump (W) T2 T1 Condenser Compressor W Evaporator T1 T2 m Pump (W) Ground loop Will affect COP, together with soil environment ! Tsoil Courtesy of: Yupeng Wu, Nottingham University GSHPA meeting, 21 January 2010, Milton Keynes

  5. 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 GSHPA meeting, 21 January 2010, Milton Keynes

  6. Land surface model GSHPA meeting, 21 January 2010, Milton Keynes

  7. GCHP modelling Courtesy of: Yupeng Wu, Nottingham University Plan view of isotherms generated from prediction for a slinkey heat exchanger, at1, 10, 50 and 140 hours GSHPA meeting, 21 January 2010, Milton Keynes

  8. 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 GSHPA meeting, 21 January 2010, Milton Keynes

  9. UK soil textures The National soil map, NATMAP (NSRI) Soil texture • Soil properties such as: • Dry bulk density • Hydraulic properties • Thermal properties GSHPA meeting, 21 January 2010, Milton Keynes

  10. Field campaign started 2th October 2009, near Oxford slinky GCHP Profile over ~ 1m: - 8 Thermistors - 6 Thetaprobes Cooling near the slinky due to heat extraction… how will this affect the water and heat transfer and hence the performance of GCHP…

  11. REFERENCE PROFILE GCHP PROFILE Soil temperature at 2 cm Soil temperature at 5 cm Soil temperature at ~1 m Soil moisture at 17.5 cm Soil moisture at 75 cm Soil moisture at ~1 m • 4 trenches every 5 m • 2 Profiles: • GSHP profile • Reference profile Courtesy of Raquel Garcia, Reading University GSHPA meeting, 21 January 2010, Milton Keynes

  12. Conclusions • Any questions/suggestions? • Do you have a field-site available??? Thank you for listening! GROMIT is an excellent opportunity to address many unexplored issues related to horizontal GCHP performance in the UK GSHPA meeting, 21 January 2010, Milton Keynes

  13. UK driving variables Surface temperature, 1 January 2003 Surface temperature, 1 July 2003 Courtesy: Tongfei Zhang, CEH-Wallingford GSHPA meeting, 21 January 2010, Milton Keynes

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