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Deflection design method for middle-deep layer coaxial double-pipe heat exchanger

A design method and technology of heat exchangers, applied in design optimization/simulation, computer-aided design, instruments, etc., can solve problems such as non-reference, and achieve the goal of reducing engineering land area, reducing wellhead distance, and reducing heat loss Effect

Pending Publication Date: 2022-05-24
陕西省煤田地质集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for mid-to-deep coaxial casing heat exchangers, due to differences in heat transfer characteristics and reservoir temperature characteristics with shallow buried tube heat exchangers, this value (2-6m) does not have a reference value. sex

Method used

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  • Deflection design method for middle-deep layer coaxial double-pipe heat exchanger
  • Deflection design method for middle-deep layer coaxial double-pipe heat exchanger
  • Deflection design method for middle-deep layer coaxial double-pipe heat exchanger

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Embodiment 1

[0059] The present embodiment provides a method for designing the deflection of a medium-deep coaxial casing heat exchanger, which includes the following steps:

[0060] Step 1: Establish a transient heat exchange model between the mid-deep coaxial casing heat exchanger and the rock and soil mass to obtain the temperature distribution of the rock and soil mass;

[0061] Step 2: Determine the maximum heat-affected radius R of the medium-deep rock and soil mass max ;

[0062] Step 3: Design the inclination angle θ of the middle-deep coaxial casing heat exchanger d .

[0063] Further, step 1: establish a transient heat exchange model between the mid-deep coaxial casing heat exchanger and the rock and soil mass, and the specific process of obtaining the temperature distribution is as follows:

[0064] A. Establish the heat transfer control equation of the heat exchanger, including the energy control equation of the inner tube fluid and the energy control equation of the annular...

Embodiment 2

[0113] The mid-deep coaxial casing heat exchanger is mainly used for building heating, and has been popularized to a certain extent in Shaanxi in recent years. Therefore, the specific application and advantages of the present invention are illustrated by a case in Shaanxi.

[0114] The tube-well structure of the mid-deep coaxial casing heat exchanger, the geothermal geological conditions and operating conditions of the application area are shown in Table 1.

[0115] Table 1 Case Parameters

[0116]

[0117]

[0118] First, the case parameters are brought into the transient numerical heat exchange model in step 1, and the temperature distribution of the rock and soil mass after 30 years of heat exchange is calculated, and according to formulas (6) and (9), the different depths z s , different radial distances r s The difference between the temperature of the rock and soil mass at the place and the temperature of the undisturbed state of the rock and soil mass is the radi...

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Abstract

The invention provides a deflecting design method for a middle-deep layer coaxial double-pipe heat exchanger, which comprises the following steps of: 1, establishing a transient heat exchange model of the middle-deep layer coaxial double-pipe heat exchanger and a rock-soil body, and obtaining the temperature distribution of the rock-soil body; 2, determining the maximum heat influence radius Rmax of the middle-deep rock-soil body; thirdly, the deflecting angle theta d of the middle-deep layer coaxial double-pipe heat exchanger is designed; according to the deflecting design method of the middle-deep layer coaxial double-pipe heat exchanger and the novel installation form-deflecting installation form design method of the middle-deep layer coaxial double-pipe heat exchanger, the installation form and angle design of the heat exchanger are reasonably designed on the premise of avoiding heat interference of the adjacent heat exchangers to the maximum extent, the wellhead distance between the adjacent heat exchangers is reduced, and the heat exchange efficiency is improved. The method has important significance on reducing the engineering land area and reducing the heat loss of a ground pipeline.

Description

technical field [0001] The invention belongs to the technical field of heating, ventilation and air conditioning, and in particular relates to a method for designing the deflection of a middle-deep coaxial casing heat exchanger. Background technique [0002] The mid-deep coaxial casing heat exchanger mainly extracts the geothermal energy located 2000-3000m below the surface to supply heat for the building. Civilization construction concept. [0003] The coaxial casing type medium-deep buried tube heat exchanger is composed of an annular cavity and an inner tube, such as figure 1 shown. In drilling, the heat exchanger is generally filled with backfill material to reinforce the cross-section such as figure 2 As shown, the components from the center to the outside are the inner pipe fluid, the inner pipe wall, the annular cavity fluid, the outer pipe wall, the backfill material, and the drilling wall. During the heat exchange process, the lower temperature fluid flows into...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F30/28G06F111/10G06F111/12G06F113/08G06F119/08
CPCG06F30/17G06F30/28G06F2111/10G06F2111/12G06F2113/08G06F2119/08Y02E10/10
Inventor 刘俊张育平王沣浩
Owner 陕西省煤田地质集团有限公司