DOWNHOLE HEAT EXCHANGER FOR A GEOTHERMAL HEAT PUMP

The invention relates to a downhole heat exchanger for extracting geothermal energy from a borehole, wherein the inner surface of the exchanger tube comprises the following roughness values: a) an arithmetic mean roughness Ra according to DIN EN ISO 4287 in the range of 1 to 15 μm, b) an averaged ro...

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Bibliographische Detailangaben
Hauptverfasser:	PAWLIK ANDREAS, DOWE ANDREAS, GORING RAINER, HARTMANN MARKUS
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS GEOTHERMAL COLLECTORS GEOTHERMAL SYSTEMS HEATING LIGHTING MECHANICAL ENGINEERING RANGES REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE VENTILATING WEAPONS
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Beschreibung
Zusammenfassung:	The invention relates to a downhole heat exchanger for extracting geothermal energy from a borehole, wherein the inner surface of the exchanger tube comprises the following roughness values: a) an arithmetic mean roughness Ra according to DIN EN ISO 4287 in the range of 1 to 15 μm, b) an averaged roughness Rz according to DIN EN ISO 4287 in the range of 8 to 80 μm, and c) a maximum roughness depth Rz1 max according to DIN EN ISO 4287 in the range of 10 to 500 μm, comprising an improved precipitation film during operation, such that the entire surface of the exchanger tube is uniformly wetted.