Phase change micro-emulsion as cooling working substance, and applications thereof

A phase-change microemulsion and cooling medium technology, which is applied in the field of microemulsion, can solve the problems of poor universality of phase-change microemulsion, and achieve the effect of improving cooling effect, best cooling effect, and simplifying control

Inactive Publication Date: 2018-03-27
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved in the present invention is to overcome the poor universality of the phase-change microemulsion used as a heat radiation cooling working medium in the prior art, thereby providing a phase-change microemulsion suitable for heat exchange of all heating elements, thereby Expand the optional types and selection range of cooling fluid

Method used

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  • Phase change micro-emulsion as cooling working substance, and applications thereof
  • Phase change micro-emulsion as cooling working substance, and applications thereof
  • Phase change micro-emulsion as cooling working substance, and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] When water is used to cool the heating element, the temperature of the coolant at the inlet end of the radiator is 30°C, and the temperature at the outlet end is 50°C. A phase-change microemulsion is used as a cooling liquid to replace cooling water. Based on the total mass of the phase-change microemulsion, the phase-change microemulsion includes a phase-change material and water, 0.1% gum arabic as a surfactant and 1% NaCl. The specific heat of the phase change material is C p (kJ / kg / K), the phase change enthalpy of the phase change material is H (kJ / kg), the phase change temperature of the phase change material is T (℃), and the phase change material accounts for the phase change microemulsion The mass fraction of is χ. Since the contents of gum arabic and NaCl are small and have little effect on the heat transfer performance of phase change microemulsion, the effects of surfactants and inorganic salts on heat transfer are ignored in the calculation.

[0034] The t...

Embodiment 2

[0099] When water is used to cool the heating element, the temperature of the coolant at the inlet end of the radiator is 30°C, and the temperature at the outlet end is 70°C. Paraffin 6106 (composition is a mixture of between 16 and 28 carbon atoms) supplied by Ter Hell Paraffin Hamburg, Germany can be selected. The mass fraction of the phase change material in the phase change microemulsion is 50%. Its related parameters are shown in Table 3. 0.1% gum arabic as surfactant and 1% NaCl. Since the contents of gum arabic and inorganic salts are small and have little effect on the heat transfer performance of phase change microemulsions, the effects of surfactants and inorganic salts on heat transfer are ignored in the calculation.

[0100] Table 3 Phase Change Material Parameters 1

[0101]

[0102] When the heat released by the system increases, the temperature of the phase change material rises to over 42°C, and the phase change material absorbs the heat in the heating el...

Embodiment 3

[0116] The treatment object of this embodiment is the same as that of Example 1, the difference is that the phase change microemulsion includes phase change material and water, based on the total mass of the phase change microemulsion, also includes 0.5% surfactant dodecane Sodium lauryl sulfate and 1% inorganic salt KCl, because the content of sodium lauryl sulfate and inorganic salt is small, and has little effect on the heat transfer performance of phase change microemulsion, so the surfactant and inorganic salt are ignored in the calculation. The calculation method for the influence of salt on heat transfer is the same as in Example 1.

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Abstract

The invention discloses a phase change micro-emulsion as a cooling working substance. The phase change micro-emulsion comprises a phase change material, a surfactant, water and an inorganic salt, wherein the phase change material is a mixture formed from one or a variety of paraffins. According to the present invention, the phase change micro-emulsion has good fluidity, can reduce the temperaturechange of the cooling liquid during heat absorbing, and can greatly improve the heat dissipation efficiency and increase the system stability; and the phase change material meets the following conditions that (Cp[delta]T+H) / [delta]T is more than 4.2, [delta]T is T2-T1, and T is more than T1+{(4.2*[delta]T-Hx)} / {4.2(1-x)+Cpx}, wherein where Cp (kJ / kg / K) is the specific heat of the phase change material, H (kJ / kg) is the phase change enthalpy of the phase change material, T2 (DEG C) is the maximum temperature of the cooling liquid at the outlet position when the cooling liquid is water after theheat exchange work is completed, T1(DEG C) is the temperature of the cooling liquid at the inlet position when the cooling liquid is water, T (DEG C) is the phase change temperature of the phase change material, and X is the mass fraction of the phase change material accounting for the phase change micro-emulsion.

Description

technical field [0001] The invention relates to a microemulsion, in particular to a phase change microemulsion as a cooling working medium and its application. Background technique [0002] Water is widely used as a conventional coolant due to its properties such as high specific heat. Because of its advantages of uniform cooling, good effect and low noise, the water-cooling system has been widely used and paid a lot of attention in various industries. However, in the heat exchange process, heat is completely transferred in the form of sensible heat, so the heat absorbed by a unit mass of water depends entirely on its specific heat capacity and temperature difference. Under the condition that the scale of the cooling system remains unchanged, with the increase of the power of the heating element, the outlet temperature of the cooling water will continue to rise, and the temperature of the heating element will gradually increase, which cannot meet the cooling demand. However...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 雷宪章丁玉龙谯耕贺之渊张译文彭笑东
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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