Coaxial borehole heat exchanger and method of producing the same

US10001300B2 · kind B2 · utility

Assignee

• TRIOPIPE GEOTHERM AB · SE

Inventor

• Thomas Andersson · Eskilstuna, SE

Key dates

• Filing date: Dec 6, 2013
• Grant date: Jun 19, 2018
• Expiry date: Jun 25, 2034

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E60/14
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

A coaxial borehole heat exchanger includes an innermost pipe and an intermediate pipe arranged coaxially outside the innermost pipe. The intermediate pipe has an inner surface provided with a plurality of axial grooves, and the inner diameter of the intermediate pipe corresponds to the outer diameter of the innermost pipe. The coaxial borehole heat exchanger further includes an outermost pipe arranged coaxially outside the intermediate pipe, wherein the outermost pipe has an inner surface provided with a plurality of axial grooves, and wherein the inner diameter of the outermost pipe corresponds to the outer diameter of the intermediate pipe, wherein the innermost pipe and the plurality of axial grooves of the outermost pipe define liquid flow channels, and wherein the axial grooves of the intermediate pipe define a thermal insulation layer between the axial grooves of the outermost pipe and the innermost pipe. A method of producing a coaxial borehole heat exchanger is also presented herein.