> Contents1 Reading (UK), 24-25 February 2011
EUROPEAN REGIONALDEVELOPMENT FUND
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
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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
GROMIT project team
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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
3
Primary source of energy, Rn
Top Boundary conditionRn –(H+LE) = G
Net Thermal Recharge
Ground water Flow
~1.5 m
Heat pump
Horizontal GCHPHeat extraction / Cooling
Lower Boundary conditionFh=0 (T=constant)
Diagram: Heat and water exchange processes near GCHP
G, soil heat flux
H, sensibleheat flux
E, evaporation
Key variables: soil moisture contentand soil temperature
Largely affected by climate, soil texture & vegetation
GCHPs and environmental interactions
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• 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
Project approach
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Land surface model
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The National soil map, NATMAP (NSRI)
Soil properties such as:
Dry bulk density Hydraulic properties Thermal properties
Soil texture
UK texture maps
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Rainfall Rate (kg m-2 d-1), 1 January 2003
Air Temperature (K) 1 January 2003
Courtesy of: Tongfei Zhang, CEH-Wallingford
UK driving variables
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2 Profiles:-GSHP profile-Reference profile
Measurements:- Bulk density- Water retention curve- Soil temperature- Soil moisture content- Thermal properties)- Inlet/outlet data
slinky
Field measurements
Cooling near the slinky due to heat extraction… how will this affect the water and heat transfer and hence the performance of GSHP
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Some results
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• 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
Conclusions/Outlook