geothermal energy joanne smith uk projections 2000-2030 february 24 th 2005
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Geothermal EnergyJoanne Smith
UK projections 2000-2030
February 24th 2005
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Why and How?
Earths internal heat. Deeper into earth, hotter the env. Geothermal gradient 15℃-50℃ per km. Water surrounding hot rocks gets
heated. High enthalpy >150℃ Low enthalpy <150℃
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Advantages
Scarce emissions into atmosphere. Geothermal heat always available. Small operating costs. Higher load factor than other resources. No need for storage facilities at plant.
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Disadvantages
Not possible in all places. Undesirable gases given off. Noise problems- electricity generation. Problems of deposition in pipes. Induced seismicity and ground
subsidence.
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Geothermal energy UK
Possible sites of deep geothermal aquifers
Water at suitable temp for heating.
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Southampton
76℃ at 1800m. District Heating
Scheme. 2MW plant. 30,000MWh/yr heat. 1,200MWh/yr chilled
water. 20 major consumers
inc ASDA.
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Future Projections
Taken over 20 years to build 2MW plant. Wearbourne set to be 2MW. Improvements in technology. Estimated Build Rate of 1 20MW plant every
5 years. All thermal energy, no electricity. Load Factor 65%
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Future Projections
Year Thermal energy PJ
2000 0.003
2010 0.0063
2020 0.013
2030 0.019
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Cost of future Projections
Year Cumulative cost of construction in
£million
2000 1.24
2010 3.72
2020 6.2
2030 8.68