| http://www.w3.org/ns/prov#value | - For example, it is contemplated that a hydrocarbon, such as a C4 to C10 alkane, could be used as the working fluid, especially where it is desirable to use a direct contact heat exchanger to extract heat from the geothermal fluid produced from hydrothermal formation 16 and a downhole indirect heat exchanger is employed to extract thermal energy from dry hot rock formation 32.
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