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Supercritical phase-change intensified heat diffusion method and its heat-transfer medium and applications

A technology for enhancing heat transfer and supercritical phase, which is applied in heat transfer modification, heat exchange equipment, lighting and heating equipment, etc.

Inactive Publication Date: 2008-10-15
李建民
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the research on the heat transfer performance of supercritical fluid is limited to studying it as a fluid, such as using a special external pump to provide power for fluid heat transfer as a fluid;

Method used

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  • Supercritical phase-change intensified heat diffusion method and its heat-transfer medium and applications
  • Supercritical phase-change intensified heat diffusion method and its heat-transfer medium and applications
  • Supercritical phase-change intensified heat diffusion method and its heat-transfer medium and applications

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Embodiment 1

[0030] The supercritical phase change enhanced heat transfer method and the heat transfer medium involved in this embodiment are suitable for application fields: building heating, engine cooling, liquid cooling of electronic devices, temperature control of machinery and medical equipment, aerospace, and military affairs.

[0031] Basic supercritical heat transfer medium: carbon dioxide, critical temperature 31.3°C, critical pressure 7.29MPa, working temperature range: 30-100°C, working pressure range: 8-15MPa,

[0032] Different auxiliary phase change heat transfer substances are adopted in the following different embodiments:

Embodiment 11

[0034] The auxiliary phase change heat transfer material is a liquid-gas phase change material, which is a mixture of methanol and ethanol. In this embodiment, the volume ratio of each component of the supercritical heat transfer medium composed of the basic heat transfer medium and the auxiliary phase change heat transfer material is:

[0035] Water: 100, vaporization temperature is 100°C;

[0036] Methanol: 30, vaporization temperature: 64.7°C;

[0037] Ethanol: 40, vaporization temperature: 78.3°C;

[0038] The heat transfer method using this enhanced heat transfer medium is: adding methanol and ethanol to carbon dioxide as a heat transfer medium. At the heating end, as the temperature rises, carbon dioxide becomes a supercritical fluid, which contains water, methanol, and ethanol. Fog beads, the mist beads themselves play a role in enhancing heat transfer. After the temperature rises, methanol and ethanol are vaporized. When the fluid enters the condensation end, the eth...

Embodiment 12

[0040] In this embodiment, the solid-solid phase change material is used as the auxiliary phase change heat transfer material, and 2,2-dimethylol propanol (PG) is used as the material.

[0041] The volume ratio of each component of the heat transfer medium is:

[0042] Carbon dioxide: weight 1000 grams

[0043] 2,2-Dimethylolpropanol (PG): 100g, phase transition temperature: 81.76°C, transition enthalpy: 172.458J / G;

[0044] Working temperature range: 30-100°C, working pressure range: 8-15MPa,

[0045] The enhanced heat transfer method is: adding a solid-solid phase change material to carbon dioxide as an auxiliary phase change heat transfer material. At the heating end of the heat exchange system, when the carbon dioxide is heated to 81.76°C, PG begins to undergo endothermic phase change. When the temperature is low It starts to release heat at 81.76°C, so as to realize heat transfer and temperature control by solid-solid phase change;

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Abstract

The invention aims to provide a supercritical phase change heat transfer enhancement method, as well as a working medium and application thereof. The method ensures that heat transfer media become multiphase to enhancing the heat transfer capacity of supercritical heat transfer media by adding phase change matter to basic supercritical matter, so as to realize the objective of enhancing the heat transfer capacity of a system, thermal control and thermal management. The phase change matter added in realizes the objective of enhancing heat transfer through atomization or phase change.

Description

technical field [0001] The invention relates to a method for enhancing heat transfer by using supercritical fluid, and a supercritical enhanced heat transfer medium and its application. The enhanced heat transfer of supercritical fluid is realized by adding auxiliary phase change heat transfer substances into basic supercritical fluid, and Overall thermal control and thermal management. Background technique [0002] Using heat transfer medium to transfer heat is the most common way of heat transfer, that is, using heat transfer medium to absorb heat at the heat source, and make the heat transfer medium after absorbing heat release heat in the heat release device or heat release end to achieve heat transfer. hot purpose. As a fluid, the heat transfer medium flows in a closed, closed or semi-closed system. This heat transfer method is widely used in industrial fields as well as civil and industrial equipment. [0003] The heat transfer process includes all processes of heat...

Claims

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Application Information

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IPC IPC(8): F28F13/00
Inventor 李建民
Owner 李建民
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