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Medium-deep layer buried pipe fluid temperature field analysis method considering underground water seepage

A technology of groundwater seepage and fluid temperature, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of small calculation amount, unable to analyze the influence of groundwater seepage or calculation amount, etc., and achieve small calculation amount and high precision , the effect of high calculation accuracy

Pending Publication Date: 2021-10-01
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the problem that the existing medium-deep buried pipe fluid temperature field analysis method cannot analyze the influence of groundwater seepage or has a large amount of calculation, the present invention considers groundwater seepage fluid temperature field analysis method of medium-deep buried pipe, which is used for calculating The temperature field of the inner pipe fluid and the outer pipe fluid that changes with depth and time in the medium-deep buried pipe not only considers the influence of groundwater seepage in the rock and soil, but also considers the geothermal gradient and the temperature change of the inner and outer pipe fluids in the vertical direction, and The amount of calculation required is small, and it is convenient to calculate

Method used

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  • Medium-deep layer buried pipe fluid temperature field analysis method considering underground water seepage
  • Medium-deep layer buried pipe fluid temperature field analysis method considering underground water seepage
  • Medium-deep layer buried pipe fluid temperature field analysis method considering underground water seepage

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Embodiment 1

[0110] In this embodiment, for a virtual mid-deep buried pipe, the fluid temperature field analysis method of the mid-deep buried pipe of the present invention is used to calculate the fluid temperature field at different times, and the calculation results are compared with the simulation results of the Fluent software. The relevant parameters of the medium-deep buried pipe are shown in Table 1.

[0111] It is known that the length L=1000m of the middle-deep buried pipe, then the borehole and the rock and soil are divided into 201 sections axially, that is, M=201, then Δz=L / (M-1)=5m;

[0112] The total time simulated is 100 hours, namely t tol = 100 hours. Set the time step Δt=2 minutes, then the number of time segments N=t tol / Δt=3000.

[0113] initial time (i.e. t 0 The fluid temperature of the inner and outer pipes and the initial temperature of rock and soil at time) are functions of depth:

[0114]

[0115] based on t 0 The temperature field of the inner and out...

Embodiment 2

[0120] In this embodiment, for a virtual medium-deep buried pipe, the fluid temperature field analysis method of the medium-deep buried pipe of the present invention is used to calculate the fluid temperature field at different times, and the calculation results are compared with other model simulation results. The relevant parameters of the mid-deep buried pipe are shown in Table 2.

[0121] It is known that the length L=2000m of the middle-deep buried pipe, then the borehole and rock and soil are divided into 401 sections axially, that is, M=401, then Δz=L / (M-1)=5m;

[0122] The total time simulated is 80 hours, namely t tol = 80 hours. Set the time step Δt=2 minutes, then the number of time segments N=t tol / Δt=2400.

[0123] initial time (i.e. t 0 The fluid temperature of the inner and outer pipes and the initial temperature of rock and soil at time) are functions of depth:

[0124]

[0125] The calculation steps are the same as those in Embodiment 1, and will not ...

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Abstract

The invention provides a medium-deep layer buried pipe fluid temperature field analysis method considering underground water seepage, which is used for calculating temperature fields of inner pipe fluid and outer pipe fluid of a medium-deep layer buried pipe changing along with depth and time. The method comprises the following steps of: firstly, assuming that heat transfer in a drill hole is steady-state heat transfer and the drill hole is approximated to a moving linear heat source, then establishing a steady-state heat transfer equation of an inner pipe fluid and an outer pipe fluid, and establishing an equation of a drill hole wall surface temperature and a heat flow transferred to rock soil from the drill hole by adopting a moving linear heat source model and a variable heat flow superposition principle; and secondly, axially dividing the drill hole of the middle-deep layer buried pipe and rock soil outside the drill hole into a plurality of sections, setting a time step length, discretizing the equation, and solving the equation by adopting an iteration method, so as to obtain temperature fields of the inner pipe fluid and the outer pipe fluid of the middle-deep layer buried pipe. According to the method, the influence of underground water seepage on the middle-deep layer buried pipe is considered, the precision is high enough, and the calculated amount is small.

Description

technical field [0001] The invention belongs to the technical field of ground source heat pumps, and specifically relates to a method for analyzing the temperature field of a medium-deep buried pipe fluid in consideration of groundwater seepage, which is used for analyzing the temperature fields of the inner pipe fluid and the outer pipe fluid in the middle-deep buried pipe . Background technique [0002] Medium-deep buried pipes can effectively extract the heat energy of medium-deep rock and soil, and have the advantages of small footprint, high heat transfer intensity, and low requirements for the balance of cold and heat loads throughout the year, so they have good application prospects. The analysis method of the fluid temperature field of the medium-deep buried pipe is the theoretical basis for the simulation and design of the medium-deep buried pipe, so it is of great significance to study the analysis method of the fluid temperature field of the medium-deep buried pip...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F111/10G06F113/08G06F119/08
CPCG06F30/20G06F2119/08G06F2111/10G06F2113/08Y02E10/10
Inventor 王昌龙王鑫鲁进利张朋远孙彦红方晗
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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