gromit project: gro und coupled heat pumps mit igation potential
DESCRIPTION
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): - PowerPoint PPT PresentationTRANSCRIPT
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GROMIT project: GROund coupled heat pumps MITigation potential
Anne Verhoef on behalf of the GROMIT teamDepartment of Soil Science, University of Reading
1GSHPA meeting, 21 January 2010, Milton Keynes
NERC research grant
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GROMIT team
2GSHPA meeting, 21 January 2010, Milton
Keynes
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
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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
3GSHPA meeting, 21 January 2010, Milton Keynes
GCHPs and environmental factors
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 Courtesy of Raquel Garcia,
Reading University
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• Type of horizontal GCHP• Spacing of loops • Installation depth • Back-filling material• Fluid in HE• Pumps
4GSHPA meeting, 21 January 2010, Milton Keynes
GCHP-related technical & design factors
Pump
Pump
Compressor
Evaporator
Condenser
Ground loop
Load
T1T2
T2T1
m
m
W
Tsoil
(W)
(W)
Will affect COP, together with soil environment !
Courtesy of: Yupeng Wu, Nottingham University
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5GSHPA meeting, 21 January 2010, Milton Keynes
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
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Land surface model
6GSHPA meeting, 21 January 2010, Milton Keynes
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GCHP modelling
7GSHPA meeting, 21 January 2010, Milton Keynes
Plan view of isotherms generated from prediction for a slinkey heat exchanger, at 1, 10, 50 and 140 hours
Courtesy of: Yupeng Wu, Nottingham University
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UK driving variables
8GSHPA meeting, 21 January 2010, Milton Keynes
Rainfall Rate (kg m-2 d-1), 1 January 2003
Air Temperature (K) 1 January 2003
Courtesy of: Tongfei Zhang, CEH-Wallingford
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UK soil textures
9GSHPA meeting, 21 January 2010, Milton Keynes
The National soil map, NATMAP (NSRI)
Soil properties such as:
Dry bulk density Hydraulic properties Thermal properties
Soil texture
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10
Field campaign started 2th October 2009, near Oxford
GCHP Profile over ~ 1m:
- 8 Thermistors- 6 Thetaprobes
slinky
Cooling near the slinky due to heat extraction… how will this affect the water and heat transfer and hence the performance of GCHP…
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GSHPA meeting, 21 January 2010, Milton Keynes 11
GCHP PROFILE REFERENCE PROFILE
4 trenches every 5 m
2 Profiles:-GSHP profile-Reference profile
Soil temperature at 2 cmSoil temperature at 5 cmSoil temperature at ~1 m
Soil moisture at 17.5 cmSoil moisture at 75 cmSoil moisture at ~1 m
Courtesy of Raquel Garcia, Reading University
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Conclusions
12GSHPA meeting, 21 January 2010, Milton Keynes
GROMIT is an excellent opportunity to address many unexplored issues related to horizontal GCHP performance in the UK
• Any questions/suggestions?• Do you have a field-site available???
Thank you for listening!
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UK driving variables
13GSHPA meeting, 21 January 2010, Milton Keynes
Surface temperature, 1 July 2003Surface temperature, 1 January 2003
Courtesy: Tongfei Zhang, CEH-Wallingford