Properties of different particle-sized activated carbon/myristic acid composite phase change material

doi:10.19799/j.cnki.2095-4239.2020.0232

Abstract

Abstract:

The organic phase change materials show good potential for development in the future; they are widely used in building energy saving, low-temperature storage of solar energy, waste heat recovery, intelligent textiles, constant temperature protection of electronic devices, and battery thermal management. Myristic acids (MAs) were used as the main phase change materials, and activated carbons (ACs) of different sizes were used for the framework. All the AC/MA composites as form-stable phase change materials were prepared by the melt-blending method. The physical properties and performance of the composites as form-stable phase change materials were characterized by a tablet pressing machine, infrared thermal imagery, a thermal conductivity instrument, and a resistivity meter. The optimum mass fractions of AC with 200, 300, 325 and 400-mesh in the MA were 47%, 42%, 38% and 35%, respectively. The mass fractions decreased with the decrease in particle size of the AC. The density of the composites as form-stable phase change materials increased with the increasing CA mass fraction and the molding pressure, while the leakage rate decreased with the increase of the pressure and the CA mass. The temperature field distributions of the composites, as form-stable phase change materials, were more evenly distributed, and the heat storage and release time were shorter than that of the pure MA. The thermal conductivity of the composite materials was increased by 1.91～4.11, 2.05～3.93, 1.71～3.93, and 1.97～4.11 times that of the pure MA. The resistivity of the composite material would decrease with the increase of pressure and the graphite adding mass fraction. After adding 10% graphite, the resistivity would decrease by 1～2 orders of magnitude. The resistivity of the mixed material fluctuates less in a liquid state. The fitting analysis shows that there is an exponential attenuation trend between the resistivity and the pressure.

Key words: activated carbon, composites as form-stable phase change materials, temperature field distributions, thermal conductivities, resistivities

CLC Number:

TK 02

Zhong XU, Jing HOU, Jun LI, Enhui WU, Ping HUANG, Yalan TANG. Properties of different particle-sized activated carbon/myristic acid composite phase change material[J]. Energy Storage Science and Technology, 2021, 10(1): 177-189.

Figures/Tables 18

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AC1/MA		AC2/MA		AC3/MA		AC4/MA
AC1/%	T₁/℃	AC2/%	T₁/℃	AC3/%	T₁/℃	AC4/%	T₁/℃
10	2.0	10	3.5	10	3.0	10	2.6
20	2.8	20	1.9	20	3.6	20	2.3
30	3.6	30	3.3	30	4.0	30	1.6
40	2.4	40	2.4	40	1.0	33	3.5
50	2.3	50	0.6	45	1.2	34	2.4
60	0.6	55	0.6	50	0.6	35	0.6

压力/MPa	纯MA		AC1/MA		AC2/MA		AC3/MA		AC4/MA
压力/MPa	T₁/℃	T₂/℃	T₁/℃	T₂/℃	T₁/℃	T₂/℃	T₁/℃	T₂/℃	T₁/℃	T₂/℃
0			3.1	2.7	1.6	0.6	0.6	0.6	1.1	3.6
2	8.4	3.1	6.3	2.9	3.3	0.6	1.8	0.6	0.6	0.5
4	4.1	2.5	4.0	2.4	0.9	0.5	0.6	0.5	2.5	0.7
6	4.6	1.9	0.6	0.6	5.6	2.6	3.1	0.6	8.7	5.7
8	4.9	3.2	0.8	1.3	5.1	2.4	3.9	1.8	5.1	5.1
10	3.5	3.0	0.8	0.6	5.3	1.7	5.6	2.3	3.4	2.3

材料	拟合方程	决定系数R²
AC4	y=2179.7+19534.6×exp(-x/2.0563)	0.98378
AC4+8% graphite	y=396.65+9130.98×exp(-x/1.3769)	0.98929
AC4+10% graphite	y=89.091+6212.06×exp(-x/1.10557)	0.99657
AC1/MA+8% graphite	y=53.7174+3435.53×exp(-x/1.43462)	0.96591
AC2/MA+8% graphite	y=9.18046+2017.35×exp(-x/1.4661)	0.99234
AC3/MA+8% graphite	y=16.3976+7789.82×exp(-x/1.3499)	0.99956
AC4/MA+8% graphite	y=6.58653+320.273×exp(-x/1.8332)	0.99231
AC1/MA+10% graphite	y=12.2668+1867.63×exp(-x/1.1826)	0.97837
AC2/MA+10% graphite	y=4.12206+344.133×exp(-x/1.3839)	0.98201
AC3/MA+10% graphite	y=7.75698+1922.48×exp(-x/1.0871)	0.98899
AC4/MA+10% graphite	y=4.11500+290.631×exp(-x/1.6605)	0.98819
AC4+10% graphite +MA	y=19.8737+2902.24×exp(-x/0.8959)	0.99927

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