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Semi-analytical method for predicting performance of deep-layer butt-joint buried heat exchanger

A performance prediction and heat exchanger technology, which is applied in the testing of machine/structural components, instruments, measuring devices, etc., can solve problems such as the inability to predict the performance of deep-to-ground buried heat exchangers.

Active Publication Date: 2020-09-11
XI AN JIAOTONG UNIV
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Problems solved by technology

[0003] Aiming at the technical problem of not being able to predict the performance of deep ground-buried heat exchangers in the prior art, a semi-analytical method that can quickly predict its performance was invented

Method used

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  • Semi-analytical method for predicting performance of deep-layer butt-joint buried heat exchanger
  • Semi-analytical method for predicting performance of deep-layer butt-joint buried heat exchanger
  • Semi-analytical method for predicting performance of deep-layer butt-joint buried heat exchanger

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Embodiment

[0098] In order to illustrate the technical solution of the present invention more clearly, the calculation object is a docking heat exchange well with a depth of 2505 meters, a horizontal distance of 200 meters, and a heat exchange medium of water, and an example of running for 1 day (t=86400s) to implement Examples are introduced.

[0099] S100: Calculate the segment division part. The deep-to-ground buried heat exchanger is divided into 51 calculation sections along the flow direction of the working fluid. Among them, the 1st to 25th and 27th to 51st calculation segments are in the vertical direction, and their length is length(i)=100m; the 26th calculation segment is in the horizontal direction, and their length is length(26)=200m.

[0100] S200: a parameter assignment part. The structural parameters of the heat exchanger are: outer diameter r o (i) = 0.06985m, inner diameter r i (i) = 0.06068m, drilling diameter r b =0.10795m, heat exchanger inlet temperature T in =...

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Abstract

The invention discloses a semi-analytical method for predicting the performance of a deep-layer butt-joint buried heat exchanger. Based on basic rules of convection and heat conduction in heat transfer science, an energy conservation and iterative calculation method, and by utilizing structural parameters, operating parameters, rock-soil and aquifer physical property parameters and the like of theburied heat exchanger in actual engineering, rapid prediction of the performance of the buried heat exchanger in deep butt joint is achieved, so that data such as outlet water temperature, heat taking amount and surrounding rock-soil temperature distribution of the heat exchanger under different operating durations are obtained. According to the method, the heat exchange performance and the heatsupply capacity of the heat exchanger can be integrally evaluated according to geological conditions and heat exchanger parameters before an actual geothermal energy heat supply project is developed,so that a theoretical basis and data support are provided for development of the actual project. The method can be implemented before engineering development, and has the advantages of easiness in implementation and quickness in calculation.

Description

technical field [0001] The invention relates to a semi-analytic method for predicting the performance of a deep-ground buried heat exchanger, and belongs to the technical field of heat exchanger performance prediction. Background technique [0002] Geothermal energy is a green energy with large reserves, wide distribution, clean and pollution-free. The rock and soil located in the deep underground have a high temperature and are relatively stable, which is a resource with great potential and development value. The deep-to-ground buried heat exchanger is a new type of geothermal energy utilization equipment with good heat transfer performance. At present, there is no mature prediction method for ground-buried heat exchangers, and the existing predictions for the performance of ground-buried heat exchangers mostly use numerical simulation calculation methods, which take a long time to calculate, and the process of model establishment and grid division is complicated. And for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M99/00
CPCG01M99/002G01M99/005G01M99/008
Inventor 金立文贾国圣崔鑫马真迪夏振华王嘉伟
Owner XI AN JIAOTONG UNIV
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