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Heat transfer coupling simulation order reduction method for buried pipe heat exchanger

A technology for buried tube heat exchangers and heat exchangers, applied in the direction of design optimization/simulation, etc., can solve problems such as no model reduction method, achieve good adaptability and flexibility, fast calculation method, cost and time saving Effect

Active Publication Date: 2020-04-07
XI AN JIAOTONG UNIV
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Problems solved by technology

However, there is no application of model reduction methods in the field of heat transfer performance simulation of buried tube heat exchangers

Method used

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  • Heat transfer coupling simulation order reduction method for buried pipe heat exchanger
  • Heat transfer coupling simulation order reduction method for buried pipe heat exchanger
  • Heat transfer coupling simulation order reduction method for buried pipe heat exchanger

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Embodiment Construction

[0044] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] The reduced-order solution method for the heat transfer of the buried tube heat exchanger, taking the Krylov subspace model reduced-order method as an example, expands the state variables of the system in the frequency domain, and then constructs the required reduced-order matrix. The technical route is as follows image 3 As shown, the detailed steps are as follows.

[0046] Step 1: Analyze the heat transfer process between the buried tube heat exchanger and the rock and soil, and establish a physical and mathematical model for the heat transfer of the buried tube heat exchanger.

[0047] Based on the different heat transfer mechanisms of the fluid in the heat exchanger and the rock-soil solid, the control equation includes two parts: the control equation for the convective heat transfer of the fluid in the buried tube heat exchanger ...

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Abstract

The invention discloses a heat transfer coupling simulation order reduction method for a buried pipe heat exchanger. The method comprises the following steps: step 1, establishing a control equation;step 2, boundary determination; 3, obtaining an original system in a state space form of the mathematical model of the heat transfer problem of the buried pipe heat exchanger; 4, performing order reduction on the original system obtained in the step 3 by adopting a model order reduction method to obtain a price reduction system formula; 5, performing numerical solution on the reduced-order systemformula to obtain a solution of the reduced-order system; and step 6, through the reduced-order system coefficient matrix obtained in the step 4 and the reduced-order system state variable obtained inthe step 5, performing calculating to obtain an output variable, i.e., an approximate solution of an original system output variable, i.e., a numerical solution of an output variable of a control equation under a corresponding boundary condition. The scale of the order reduction system is far smaller than that of an original system, only one small-scale system needs to be solved, and therefore computing resources are saved, and the running time of a computing program is greatly shortened.

Description

technical field [0001] The invention belongs to the field of heat transfer numerical calculation methods, and in particular relates to a heat transfer coupling simulation reduction method for a buried tube heat exchanger. Background technique [0002] Geothermal energy has the characteristics of large reserves, wide distribution, clean and environmentally friendly, stable and reliable. The geothermal energy heating (cooling) is mainly realized through the ground source heat pump system, and the key to improving the efficiency of the system is to improve the heat transfer performance of the buried tube heat exchanger. However, the heat transfer of buried tube heat exchangers in rock and soil is a complex and changeable dynamic heat transfer process, involving many factors, such as rock and soil thermophysical parameters, structural settings of heat exchangers, fluid operating parameters, etc. The burial depth of buried tube heat exchangers using shallow geothermal heat is 10...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23
CPCY02E10/10
Inventor 孔琼香蒋耀林马真迪
Owner XI AN JIAOTONG UNIV
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