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Identification method of pipe-soil gap for underground heat exchanger

A technology of underground heat exchanger and identification method, applied in the field of underground energy storage and ground source heat pump, can solve the problems of difficulty, small gap size, quantitative research and so on

Inactive Publication Date: 2018-01-05
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the pipe-soil gap of the underground heat exchanger is located in the underground rock and soil, and the gap size is relatively small, so it is difficult to quantify it with direct testing tools or visualization methods

Method used

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  • Identification method of pipe-soil gap for underground heat exchanger
  • Identification method of pipe-soil gap for underground heat exchanger

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Embodiment Construction

[0010] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0011] Such as figure 1 and figure 2 As shown, the pipe-soil gap identification system includes eight-pin probe 1, 1# positive electrode 2a, 2# positive electrode 2b, 1# heat exchange tube 3a, 2# heat exchange tube 3b, 1# electrode wire 4a, 2# Electrode wire 4b, probe wire 5, transfer switch 6, DC power supply 7, negative electrode 8, potential difference recorder 9, heat exchange rock and soil 10. It is characterized in that 1# positive electrode 2a and 2# positive electrode 2b are respectively connected to changeover switch 6 through 1# electrode lead 4a and 2# electrode lead 4b, and then connected to the positive pole of DC power supply 7 and the positive pole of potential difference recorder 9, respectively. The 1# heat exchange tube 3a and the 2# heat exchange tube 3b form respective stable potential fields around them, and serve as positive electrodes for pot...

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Abstract

The invention discloses a pipe-soil gap identification method for an underground heat exchanger. The identification system mainly includes an eight-pin probe, a positive electrode, a negative electrode, a heat exchange tube, a connecting wire, a transfer switch, a DC power supply, and a potential difference recorder , Heat exchange rock and soil. The invention monitors the potential difference at the corresponding position in the pipe-soil heat exchange structure, and judges the equivalent width of the pipe-soil gap at the detection position and the distribution of the gap in the circumferential direction of the pipe section, thereby realizing the identification of the target gap section, It lays the foundation for its quantitative research, so as to provide a reference for controlling and reducing the thermal resistance of the pipe and soil, and choosing a reasonable tube structure and operation mode for the underground heat exchanger.

Description

technical field [0001] The invention relates to the technical field of underground energy storage and ground source heat pumps, in particular to a pipe-soil gap identification method for an underground heat exchanger. Background technique [0002] With the deepening of application, researchers have found that high temperature or low temperature large temperature change underground heat transfer can better improve energy utilization efficiency, especially in the application process of underground energy storage and ground source heat pump with large temperature difference When the temperature of the container reaches 90°C or higher, and when it is lower than 0°C or lower, the problem of gap thermal resistance caused by the separation of the heat exchange tube and the backfill soil often occurs. In the current application, the underground heat exchange pipe is mainly made of high-density polyethylene (HDPE) material, and its thermal expansion coefficient is quite different fro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/02
Inventor 高青王有镗于鸣朱晓林
Owner JILIN UNIV