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Phase-transition temperature adjustable composite phase-change material

A composite phase-change material and phase-change temperature technology, which is applied in the field of phase-change energy storage, can solve the problems of complex and economical selection of phase-change materials, and achieve the effects of reducing cumbersome steps in material selection, low price, and strong economy.

Inactive Publication Date: 2019-07-23
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a composite phase change material with adjustable phase change temperature to solve the problems of complex material selection process and economical efficiency of phase change materials

Method used

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  • Phase-transition temperature adjustable composite phase-change material

Examples

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Embodiment 1

[0026] The fatty acid used in the composite phase change material with adjustable phase change temperature in the embodiment of the present invention is stearic acid, by changing the ratio of 62# paraffin wax and stearic acid, the experiment of phase change temperature is carried out, adopting thermal analysis method (Differential Scanning Calorimeter, DSC) tests the phase change temperature and latent heat of phase change of the composite phase change material. Through the analysis software, the initial point is used as the phase change temperature of the sample, and the area is used as the latent heat of phase change, and the thermal conductivity tester is used to test the composite phase change material The thermal conductivity is measured, and its specific ratio and results are shown in Table 1 below, and the corresponding test results are as follows figure 1 , figure 2 and image 3 shown.

[0027] Table 1

[0028]

[0029] Specific steps: according to the above mas...

Embodiment 2

[0036] The second embodiment provides a composite phase change material using graphite, 62# paraffin and stearic acid as raw materials. In this example, a composite phase change material with a ratio of 62# paraffin wax to stearic acid of 2:8 is used, the phase change temperature is 62.73°C, the latent heat of phase change is 205.53J / g, and the thermal conductivity is 0.254W / (m·K ). Experiments were carried out by adding different graphite ratios to the composite material at this ratio, and the specific ratios and results are shown in Table 2 below.

[0037] Table 2

[0038]

[0039] The composite phase-change material (the ratio of 62# paraffin wax to stearic acid is 2:8) and graphite are weighed with a balance according to the above-mentioned mass ratio, then put into a beaker, and irradiated with an infrared lamp. After the sample is melted, , stirring and shaking until the mixture is uniform, then the infrared lamp is removed, and the graphite-added composite phase ch...

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Abstract

The invention provides a phase-transition temperature adjustable composite phase-change material. The phase-transition temperature adjustable composite phase-change material comprises 62# paraffin andfatty acid, wherein the phase-transition temperature of the composite phase-change material ranges from 43.6 DEG C to 67.7 DEG C. According to the phase-change material, matching and selection can beperformed according to the phase-transition temperature, so that the problems about complication of the material selection process and economy of the phase-change material are solved.

Description

technical field [0001] The invention relates to the technical field of phase change energy storage, in particular to a composite phase change material with adjustable phase change temperature. Background technique [0002] Phase change materials are materials that use latent heat to store heat. Latent heat refers to the large amount of heat released or absorbed by the material due to the change of the phase state of the material under the condition of constant temperature. Compared with sensible heat, latent heat has many advantages, so it has been applied in many fields, such as solar thermal power generation, building temperature control, and high-temperature heat storage. Phase change materials used in the field of phase change energy storage should have suitable phase change temperature and large phase change latent heat. [0003] The single inorganic hydrated salt phase change material that adopts in the prior art is as NaCH 3 COOH·3H 2 O (the phase transition tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 闫全英范青柱张静
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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