| 摘要 |
<p>The present disclosure relates to a coaxial borehole heat exchanger (1). The coaxial borehole heat exchanger (1) comprises an innermost pipe (7), an intermediate pipe (5) arranged coaxially outside the innermost pipe (7). The intermediate pipe (5) has an inner surface provided with a plurality of axial grooves (5a), and the inner diameter of the intermediate pipe (5) corresponds to the outer diameter of the innermost pipe (7). The coaxial borehole heat exchanger (1) further comprises an outermost pipe (3) arranged coaxially outside the intermediate pipe (5), wherein the outermost pipe (3) has an inner surface provided with a plurality of axial grooves (3a), and wherein the inner diameter of the outermost pipe (3) corresponds to the outer diameter of the intermediate pipe (5), wherein the innermost pipe (7) and the plurality of axial grooves (3a) of the outermost pipe (3) define liquid flow channels (F), and wherein the axial grooves (5a) of the intermediate pipe (5) define a thermal insulation layer (I) between the axial grooves (3a) of the outermost pipe (3) and the innermost pipe (7). A method of producing a coaxial borehole heat exchanger is also presented herein.</p> |
