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Method and device for thermal physical property test of high-temperature phase-change energy storage material

A technology of energy storage materials and high-temperature phase change, applied in the direction of material thermal development, etc., can solve the problems of increasing the outlet temperature fluctuation range, affecting the life of the container, and excessive temperature, so as to improve testing efficiency, low raw material cost, and low raw material cost. Easy to get effect

Inactive Publication Date: 2010-06-30
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among the high-temperature phase change materials that have been studied, the specific heat capacity of the metal is small, which will lead to an excessively high temperature under overload conditions, which is highly corrosive, affects the life of the container, and also increases the fluctuation range of the outlet temperature
Fluoride salts and their eutectic mixtures have two serious disadvantages: one is the large volume shrinkage when changing from liquid phase to solid phase, such as LiF up to 23%; the other is low thermal conductivity
DTA test has high requirements for samples, such as volatile substances, carbonates, LiCl at around 600 °C, KCl in the melting stage, etc. are all limited
In addition, the current testing technology requires the quality of the sample to be at a trace level, which has a great impact on the test results of samples that are prone to moisture absorption, increases the test error, and seriously deviates from the actual data

Method used

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  • Method and device for thermal physical property test of high-temperature phase-change energy storage material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Example 1: LiNO 3 / NaNO 3 Thermophysical property test of high temperature phase change energy storage materials

[0072] According to the mass ratio of 5.5:4.5, weigh 27.50g LiNO with an electronic scale 3 and 22.50g NaNO 3 , mixed and ground into a 50ml nickel crucible. Fix the nickel crucible in an iron box and place it in a resistance furnace at 220°C until the inorganic salt mixture is completely melted, take out the iron box, bury all the thermocouple probes in the molten salt, and place them in the middle of the crucible without touching the bottom of the crucible. Allow it to cool naturally, and use it as a standard sample. After the molten salt is solidified, the thermocouple is also fixed in it, and the nickel crucible with the thermocouple is fixed on the iron box support.

[0073] set up image 3 For the experimental device shown, after connecting the instruments, turn on the digital thermometer and computer using the center309 four-way thermometer, do...

Embodiment 2

[0077] Example 2: Thermal physical property test of LiCl / NaCl high temperature phase change energy storage material

[0078] First weigh 26.08g LiCl and 23.96g NaCl (mass ratio is 1.08:1), mix and grind them and put them into a nickel crucible, then fix the nickel crucible in an iron box and place it in a resistance furnace at 650°C until it is completely melted, take it out After the iron box, bury all the probes of the thermocouples in the molten salt, take out the iron box, bury all the probes of the thermocouples in the molten salt, place them in the center of the crucible without touching the bottom of the crucible, and let it cool naturally. After the molten salt is solidified, the thermocouple is also fixed in it, and the nickel crucible with the thermocouple is fixed on the iron box support.

[0079] The experimental device diagram is the same as in Example 1. After connecting the instruments, open the center309 four-way thermometer and the computer, double-click to op...

Embodiment 3

[0083] Example 3: Ca(NO 3 ) 2 / NaNO 3 Thermophysical property test of high temperature phase change energy storage materials

[0084] First weigh 18.2g Ca(NO 3 )2 and 31.8g NaNO 3 (mass ratio is 4:7), put into nickel crucible after mixing and grinding, then fix this nickel crucible in an iron box and place it in a resistance furnace at 300°C until completely melted, take out the iron box and put all the probes of thermocouples Bury it in the molten salt, take out the iron box, bury all the thermocouple probes in the molten salt, place it in the middle of the crucible, and let it cool naturally without touching the bottom of the crucible. After the molten salt is solidified, the thermocouple is also fixed in it, and the nickel crucible with the thermocouple is fixed on the iron box support.

[0085] The diagram of the experimental device is the same as in Example 1. After connecting the instruments, turn on the center309 four-way thermometer and the computer, double-click ...

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Abstract

The invention relates to a method and a device for the thermal physical property test of a high-temperature phase-change energy storage material, belonging to the technical field of high-temperature phase-change energy storage materials. Two kinds of inorganic salts close to a eutectic point are adopted for inorganic salt mixture, are evenly mixed, are ground into powder and are contained into a nickel crucible. The nickel crucible containing the inorganic salt mixture is placed in an iron box and is put into a box-type resistance furnace till the inorganic salt mixture is fully molten. After the inorganic salt mixture is molten, the molten salt is taken out. The probe of a thermocouple is inserted right into the middle of the molten salt to enable the molten salt to be cooled under natural conditions. The nickel crucible is fixed in the iron box to test a heating curve. The heating curve is observed and the iron box is taken out after the mixed salt is fully molten and the temperature is 30 DEG C to 60 DEG C higher than the temperature of a melting platform. The cooling curve of the mixed salt is tested under room temperature. After the test is completed, data is stored and data processing is conducted. The invention provides an effective means for the thermal physical property test of the phase-change energy storage material with wide temperature change range and high melting point, overcomes the test defects of DSC and DTA, and has the advantages of small investment, low raw material cost and easily obtainable raw materials, easy operation, good repeatability and high applicability.

Description

technical field [0001] The invention belongs to the technical field of high-temperature phase-change energy storage materials, and in particular relates to a method for testing thermal physical properties of high-temperature phase-change energy storage materials and a device thereof. Background technique [0002] With the rapid development of global industry, problems such as the depletion of mineral energy and the aggravation of environmental pollution have gradually become prominent. The phenomenon of energy waste in production and life is serious, and the energy in nature (such as solar energy) cannot be effectively used. demand is increasing day by day. As a kind of energy storage material, phase change material can store these wasted energy or natural energy, and release it according to different needs, so that the energy can be used reasonably. Its application fields mainly include solar thermal power generation, industrial heat utilization and waste heat recovery, po...

Claims

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Application Information

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IPC IPC(8): G01N25/20
Inventor 张东曾亮周春玉
Owner TONGJI UNIV
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