Segmental-evaporation buried gravity-assisted heat pipe with large length-diameter ratio

Abstract

The invention discloses a segmental-evaporation buried gravity-assisted heat pipe with large length-diameter ratio, comprising a condensing radiating segment, an evaporation segment and a phase changemedium; 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. A plurality of segmental evaporation members are arranged in the evaporation segment and are in hollow conical terrace shape; each segmental evaporation member has an inner arc surface and a plurality of outer ribs connected with the inner wall of a gravity-assisted heat pipe; a liquid accumulating channel is formed between every two adjacent ribs; spacing of the ribs is 10-30 times the inner diameter of the evaporation segment; each of the inner wall of the evaporation segment and the surfaces of the segmental evaporationmembers is provided with a layer of super-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 segmental-evaporation buried gravity-assisted heat pipe with large length-diameter ratio has the advantages that segmental evaporation of accumulated liquid is formed, and the inner surface is fully wetted for 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 segmental-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 exploitation and utilization of shallow geothermal energy, and in particular relates to a segmental evaporation type buried gravity heat pipe with a large length-to-diameter ratio. 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 water pipes are mostly used, such as U buried water pipes. As a new type of high-efficiency heat transfer element, the gravity heat pipe has many advantages that other heat transfer elements do not have: high-efficiency thermal conductivity, excellent temperature uniformity, heat flux variability, etc. It is widely used in aerospace, microelectronics, waste heat recovery, etc. 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 geothermal development and utilization. It...

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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 purpose of the present invention is to provide a large length-to-diameter ratio segmented evaporation type buried gravity heat pipe

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