at the Causeway it eventually accumulated as a large lava lake in the bend of a river. With a depth of 90m, this lake was slow to cool. The lava in contact with the cold rock below quickly chilled and solidified, forming irregular miniature columns a few centimetres across. This base became an effective insulating layer and allowed the great homogeneous mass of the lava lake to cool slowly and evenly, developing regular stress patterns as it solidified. As contraction continued these patterns were expressed as evenly spaced cooling cracks that permeated the entire solidifying mass, creating thousands of mainly six-sided columns, about 30-40cm across
Geothermal energy resources in ireland PGCert Geothermal Energy Technology University of Auckland Julian McDowell
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- Cost saving against conventional cooling and heating : €12,000 (NZD$25,000) - Payback period : 14.6 years - CO2 emission reduction : 256t/year - Closely controlled temperature and humidity - Award winning design – architectural and environmental awards
Deep geothermal gradient Geothermal Resource Map of Ireland (CSA, SEI 2004):
Studied both shallow and deep resources
Deep Geothermal Conclusions:
Borehole records from consultancies and mining industry: limited dataset
The project involved three phases and the last phase was supported by Sustainable Energy Ireland (national energy agency). The three phases included:
1. The drilling of two shallow boreholes to 300m in depth to mark the edge of the Dublin Basin along the BNF (WEB1 & WEB2); 2. The drilling of two deep geothermal boreholes to 1,400m in depth to identify the presence of deep geothermal target formations (NGE1 & NGE2); 3. The analysis and report writing of the data extracted during the drilling and the testing of the geothermal boreholes for the presence of geothermal heat at depth.
Geothermal ENERGY ltd. (Phase 2 Deep Geothermal Exploration Report. SLR, 2008)