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Cooling and heating with geothermal energy using enercret thermo-active foundations (energy piles) |
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Completion: |
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2001 |
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Heating capacity: |
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45 kW |
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Cooling capacity: |
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45 kW |
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Annual heating energy: |
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74 MWh |
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Annual cooling energy: |
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55 MWh |
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Client: |
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Keble College, Oxford - UK |
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Architect: |
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Rick Mather Architects Ltd., London - UK |
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Mechanical engineers: |
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Atelier Ten, Consulting Engineers Ltd., London - UK |
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enercret technology: |
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Heat exchanger: |
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15 piles, dia. 750 mm, length 12.5 m |
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14 piles, dia. 600 mm, length 7.5 m |
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61 piles, dia. 450 mm, length 5 m |
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Absorber piping: |
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Total length of pipe installation: |
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41 loops, each approx. 150 m long, amounts to 6,150 m. |
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Load bearing piles and the hard/soft secant pile wall are used to absorb thermal energy from the ground and ground water (ground temperature is approx. 12 degrees celsius in Europe). The energy is absorbed and transported to the building services center by means of fluid-filled pipe systems incorporated inside the piles. A building can be cooled for next to nothing by using the cooling fluid. In the case of heating the same system is used to extract energy by means of a heat pump. The ground provides an intermediate storage facility for excess energy - the warmth disposed during cooling period can be absorbed for heating and vice versa. For the new building Residence II of Keble College Oxford, enercret provides energy savings of 80 % and a reduction of CO2 emissions of about 20 tonnes. |
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Thermoactive floor slabs "concrete core cooling/heating" |
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The cool fluid from the foundations or chiller is pumped through PE piping systems, integrated into the concrete slabs of the building. The same piping system is used to distribute the warm water from the heat pump for heating the building. |
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"Direct cooling" and reversible ground source heat pump |
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The hydraulically reversible heat pump can be operated in either the cooling or heating mode. "Direct cooling" potential of the ground can be used up to an underground temperature of 19 degrees celsius. |
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Project sheet download: |
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To download the PDF file, please click here .* ) |
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To view PDF files you will need the Adobe Acrobat Reader. If you do not have this software, you can download the Acrobat Reader here free of charge. |
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