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Method for estimating rock-soil thermophysical parameters of sleeve type buried pipe

A technology of thermophysical parameters and buried pipes, which is applied in calculation, material thermal development, electrical digital data processing, etc., can solve the problem of low precision of geotechnical parameters, large deviation between calculation results and reference values, and no distinction correlation Differences and other issues, to achieve the effect of shortening the thermal response test time, reducing the thermal response test data, and improving the accuracy

Pending Publication Date: 2021-04-06
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, the deviation between its calculated results and the reference value is large
[0006] There are some deficiencies in the existing casing-type buried pipe geotechnical parameters testing method: the slope method ignores the experimental data in the early stage of the thermal response test (about the first 10 hours), and the required thermal response test time is long enough; the parameters The estimation method adopts a single objective function when estimating the thermal conductivity and volumetric specific heat capacity of rock and soil, and does not distinguish the correlation difference between the relevant experimental data at different times and the thermal conductivity and volumetric specific heat capacity of rock and soil, resulting in the estimated The accuracy of geotechnical parameters is low

Method used

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  • Method for estimating rock-soil thermophysical parameters of sleeve type buried pipe
  • Method for estimating rock-soil thermophysical parameters of sleeve type buried pipe
  • Method for estimating rock-soil thermophysical parameters of sleeve type buried pipe

Examples

Experimental program
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Effect test

Embodiment 1

[0047] A method for estimating geotechnical parameters of casing-type buried pipes in this embodiment relies on the KTH Royal Institute of Technology The thermal response test of the casing-type buried pipe was completed, and the geotechnical parameters of the casing-type buried pipe were estimated based on the experimental data 20 hours before the thermal response test. Because the experimental data comes from previous literature, there are few experimental data available, such as figure 2 As shown, among them, the first test moment is 0.25 hours, and the interval between subsequent adjacent test moments is 1.25 hours. This embodiment only considers the experimental data of 20 hours before the thermal response test, therefore, the total number n of all test moments in the thermal response test 1 =17, and the total number n of the pre-test time (taking the first 10 hours) 2 =9.

[0048] The steps of the method for estimating the thermophysical property parameters of the c...

Embodiment 2

[0070] A method for estimating geotechnical parameters of a casing-type buried pipe in this embodiment is basically the same as in Embodiment 1, the difference is that this embodiment estimates the casing based on the experimental data 30 hours before the thermal response test Type buried pipe geotechnical thermal physical property parameters, therefore, the total number of test times n of the thermal response test in this embodiment 1 =25, and the total number n of the pre-test time (taking the first 10 hours) 2 =9. The steps of estimating geotechnical parameters in this embodiment are completely the same as those in Embodiment 1, and will not be repeated here.

[0071] The estimated results based on the experimental data 30 hours before the thermal response test are shown in Table 2. It can be seen from Table 2 that the relative error of the rock-soil thermal conductivity and volumetric specific heat capacity estimated in this embodiment is small and the accuracy is high. ...

Embodiment 3

[0075] A method for estimating geotechnical parameters of casing-type buried pipes in this embodiment is basically the same as in Embodiment 1, the difference is that this embodiment estimates the casing based on the experimental data 40 hours before the thermal response test Type buried pipe geotechnical thermal physical property parameters, therefore, the total number of test times n of the thermal response test in this embodiment 1 =33, and the total number n of the pre-test time (taking the first 10 hours) 2 =9. The steps of estimating geotechnical parameters in this embodiment are completely the same as those in Embodiment 1, and will not be repeated here.

[0076] Table 3 The geotechnical parameters and their errors estimated by the method of Example 3 and other methods (for the first 40 hours)

[0077]

[0078] The estimated results based on the experimental data of 40 hours before the thermal response test are shown in Table 3. It can be seen from Table 3 that th...

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Abstract

The invention discloses a method for estimating rock-soil thermophysical parameters of a sleeve type buried pipe, and belongs to the technical field of ground source heat pumps. Different objective functions are adopted to estimate the thermal conductivity ks and the volume specific heat capacity Cs of rock-soil based on a sleeve type buried pipe heat transfer model and the inlet and outlet fluid temperature of a thermal response test. The method comprises the following steps: firstly, taking root-mean-square errors of inlet and outlet fluid temperatures at all test moments as a target function, estimating ks and Cs at the same time, and taking the ks and Cs as a result of the zeroth iteration; secondly, estimating Cs by taking the root-mean-square error of the inlet and outlet fluid temperature at the early test moment as an objective function; then, estimating ks by taking root-mean-square errors of inlet and outlet fluid temperatures at all test moments as a target function; and finally, circulating the two steps in an iterative mode until the difference values of ks and Cs estimated in two adjacent iterative processes are smaller than a set value, and outputting ks and Cs estimated in the last iterative process. The method has the advantages of high precision and short required thermal response test time.

Description

technical field [0001] The invention relates to the technical field of ground source heat pumps, and more specifically, relates to a method for estimating thermal physical property parameters of casing-type underground pipes. Background technique [0002] The casing type buried pipe is an important type of buried pipe in the field of ground source heat pump, and the geotechnical thermal physical parameters are the key parameters required for the design of the casing type buried pipe. [0003] At present, the commonly used method for testing geotechnical parameters of casing-type buried pipes is: relying on the experimental data of thermal response test and the heat transfer model of casing-type buried pipes, the slope method or parameter estimation method is used to estimate the thermal and physical parameters of rock and soil. Among them, the parameter estimation methods include Monte Carlo algorithm, trust region method, simplex method, pattern search algorithm, Levenberg-...

Claims

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Application Information

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IPC IPC(8): G06F30/18G06F30/20G01N25/20G06F113/08G06F113/14G06F119/08
CPCG06F30/18G06F30/20G01N25/20G06F2113/08G06F2113/14G06F2119/08
Inventor 王昌龙方晗钱付平鲁进利孙彦红汪齐
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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