Wall-attached vortex-evaporation buried gravity-assisted heat pipe with large length-diameter ratio

Abstract

The invention discloses a wall-attached vortex-evaporation buried gravity-assisted heat pipe with large length-diameter ratio, comprising a condensing radiating segment, an evaporation segment and a phase change medium; a heat-insulating segment is arranged between the condensing radiating segment and the evaporation segment; the evaporation segment and the heat-insulating segment are perpendicularly arranged in soil; the condensing radiating segment is positioned on a ground. The inner wall of the evaporation segment is provided with thread grooves or protrusions integrated to a heat pipe orspiral steel rings connected in the heat pipe in expanded manner, forming liquid accumulation channels; the thread grooves or protrusion of the evaporation segment are arranged in spiral correspondence, the surface of the evaporation segment is provided with a coating of hydrophilic material; each of the inner walls of the condensing radiating segment and the heat-insulating segment is provided with a coating of hydrophobic material. The wall-attached vortex-evaporation buried gravity-assisted heat pipe with large length-diameter ratio has the advantages that a liquid phase change medium can fully welt the inner wall of the evaporation segment and allows continuous evaporation; the length limit of a common gravity-assisted heat pipe evaporation segment is broken through, and the gravity-assisted heat pipe is imparted efficient evaporation, efficient heat transfer and low liquid-filling rate at the premise of large length-diameter ratio; the wall-attached vortex-evaporation buried gravity-assisted heat pipe with large length-diameter ratio is particularly suitable for the development and utilization of shallow geothermal energy.

Description

technical field [0001] The invention belongs to the technical field of development and utilization of shallow geothermal energy, and in particular relates to a large length-to-diameter ratio wall-attached swirl evaporation type buried gravity heat pipe. Background technique [0002] In recent years, more and more attention has been paid to the development and utilization of shallow geothermal energy. At present, buried pipes, such as U-shaped buried pipes, are mostly used. As a high-efficiency heat transfer element, the gravity heat pipe relies on gravity to condense and reflow the working fluid in the tube to complete the phase-change heat transfer cycle. It has the characteristics of high-efficiency thermal conductivity, temperature uniformity, and thermal diode. Waste heat recovery and other aspects have been widely used. However, the aspect ratio of the evaporation section of the traditional gravity heat pipe is not high, so it cannot be directly used for shallow geothe...

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Problems solved by technology

[0003] In order to solve the problem that the gravity heat pipe in the prior art cannot be directly used for the development and utilization of shallow geothermal heat, and when the length and diameter of the evaporation section are relatively large under the ground temperature, there will be uneven flow of condensed liquid, insufficient wetting of the evaporation wall, and inability to completely absorb heat. Evaporation will return to the bottom liquid pool to form a cold pool, thereby limiting the length of the gravity heat pipe and affecting the heat transfer effect. The present invention provides a swirl evaporation type buried gravity heat pipe with a large aspect ratio

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