Geothermal efficiency assessed on the basis of the specific annual withdrawal work of a geothermal probe up to 100 m depth (or up to allowed drilling depth) at 2400 annual hours of operation. The annual withdrawal work is determined from the prognostic drill profile based on the VDI Directive 4640 Sheet 2: efficient >= 100 kWh/(m*a), higher efficient >= 125 kWh/(m*a).
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