| 摘要 |
A method of operating a geothermal energy system comprising a plurality of borehole heat exchangers 412, where each heat exchanger contains a working fluid and comprises an elongate tube having a closed bottom end, and where selectively at least one first borehole heat exchanger is used as a heat source and at least one second borehole heat exchanger is used as a heat sink. In order to redistribute thermal energy within the plurality of borehole heat exchangers, thermosyphonic flow may be used to selectively distribute working fluid from a first borehole heat exchanger to a second borehole heat exchanger. In a further aspect, each heat exchanger has first and second adjacent elongate coaxial conduits interconnected at the bottom end, the first conduit being tubular and surrounded by the second conduit which is annular. Each heat exchanger has a major portion extending in an inclined orientation at an angle of 3 to 95 degrees from the vertical. In another aspect, the geothermal energy system comprises a manifold 401 for a working fluid to which a plurality of borehole heat exchangers is connected, where a plurality of valves 402 is connected between the plurality of borehole heat exchangers and the manifold.
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