Effect of graphite on latent heat and conductivity of activated carbon/fatty acid composite phase change materials

doi:10.16085/j.issn.1000-6613.2020-1617

Abstract

Abstract:

Lauric acid (LA), myristic acid (MA), palmitic acid (PA) and stearic acid (SA) were used as the main phase change materials with different particle sized activated carbon (size of AC were 75μm, 48μm, 45μm and 38μm) as the framework. All the composite materials were prepared by melt-blending method. Graphite was added to enhance the electrical conductivity of the composite phase change materials. The density, leakage rate, latent heat, thermal conductivity and electric conductivity of the composite phase change materials were studied systematically. The results showed that the mass fraction of AC added in fatty acid (FA) decreased with the decrease of particle size by 16%, 12%, 9% and 7%, respectively. AC had the best adsorption effect on MA and the worst adsorption effect on SA. The leakage rate of AC/FA decreased with the increase of AC additive amount and forming pressure, while the density was opposite. The maximum multiples of improvement of thermal conductivity of AC/FA over pure FA were 7.6 times, 10.7 times, 5.1 times and 5.1 times, respectively. AC/FA resistivity decreased with increasing pressure and graphite content. After adding 10% graphite the latent heat of the graphite composite phase change materials was dropped from 52.88—141.9J/g to 36.4—106.4J/g, but the resistivity was reduced from tens of thousands to less than 30.70Ω·cm, and thus the conductive performance was improved.

Key words: different particle sized activated carbon, composite phase change material, thermal conductivity, phase change latent heat, resistivity

摘要：

利用不同粒径活性炭（AC，粒径为75μm、48μm、45μm和38μm）作为支撑材料，以月桂酸（LA）、肉豆蔻酸（MA）、棕榈酸（PA）和硬脂酸（SA）4种脂肪酸（FA）为相变主料，采用熔融共混法制备多种AC/FA复合相变材料，并在其中添加石墨来增强材料导电性能，系统地研究了复合相变材料的密度、泄漏率、潜热、导热和导电性能。结果表明，FA中添加AC质量分数随粒径减小分别降低16%、12%、9%和7%，AC对MA的吸附效果最好，对SA的吸附效果最差；AC/FA泄漏率随AC添加量和成型压力增大而减小，密度正好相反。AC/FA的热导率比纯FA提高的最大倍数分别为7.6倍、10.7倍、5.1倍和5.1倍。AC/FA电阻率随压力和石墨添加量增加而减小，添加10%石墨后，复合相变材料潜热从52.88~141.9J/g下降至36.4~106.4J/g，但电阻率从几万降低至30.70Ω·cm以下，导电性能得到改善。

关键词: 不同粒径活性炭, 复合相变材料, 热导率, 相变潜热, 电阻率

CLC Number:

TK02

XU Zhong, HOU Jing, WU Enhui, LI Jun, HUANG Ping, TANG Yalan. Effect of graphite on latent heat and conductivity of activated carbon/fatty acid composite phase change materials[J]. Chemical Industry and Engineering Progress, 2021, 40(7): 3878-3891.

徐众, 侯静, 吴恩辉, 李军, 黄平, 唐亚兰. 石墨对活性炭/脂肪酸复合相变材料潜热和导电性能的影响[J]. 化工进展, 2021, 40(7): 3878-3891.

Figures/Tables 17

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材料	LA	MA	PA	SA
纯FA热导率/W·m^-1·K^-1	0.220^［5］、0.200^［6］、0.282^［17］、0.124^［22］、0.147^［49］	0.17^［7］、0.254^［17］、0.072^［22］、0.150^［49］	0.162^{［1，27，49］}、0.295^［10］、0.244^［17］、0.226^［22］	0.338^［12］、0.292^［14］、0.251^［16］、0.263^［17］、0.272^［22］、0.172^{［27，49］}
PCM热导率/W·m^-1·K^-1	添加59%粉煤灰0.52^［5］、添加8%CNT为3.91^［6］	添加63%硅灰（0.32）^［7］	45%硅藻土0.581^［10］、30%的EG 14.09^［11］	添加24%AC 0.469^［14］、添加20%的三维石墨多孔碳0.97^［16］

材料	LA	MA	PA	SA
纯FA热导率/W·m^-1·K^-1	0.220^［5］、0.200^［6］、0.282^［17］、0.124^［22］、0.147^［49］	0.17^［7］、0.254^［17］、0.072^［22］、0.150^［49］	0.162^{［1，27，49］}、0.295^［10］、0.244^［17］、0.226^［22］	0.338^［12］、0.292^［14］、0.251^［16］、0.263^［17］、0.272^［22］、0.172^{［27，49］}
PCM热导率/W·m^-1·K^-1	添加59%粉煤灰0.52^［5］、添加8%CNT为3.91^［6］	添加63%硅灰（0.32）^［7］	45%硅藻土0.581^［10］、30%的EG 14.09^［11］	添加24%AC 0.469^［14］、添加20%的三维石墨多孔碳0.97^［16］

材料	实验测试值				文献参考值
材料	H_0m/J·g^-1	T_rm/℃	H_0f/J·g^-1	T_rf/℃	H_0m/J·g^-1	T_rm/℃	H_0f/J·g^-1	T_rf /℃
LA	196.2	46.7	185.1	39.7	169.6~222.3	43.4~47.4	172.5~185.3	41.0~42.5^{［5-6, 17-18, 20, 22-23］}
MA	161.5	62.9	153.3	52.7	179.8~248.8	51.6~56.1	184.9~242.6	50.1~53.0^{［7-8, 17-20, 22］}
PA	224.8	65.9	220.8	57.4	183.4~275.4	61.1~64.9	176.8~284.2	59.3~60.9^{［1, 9-11, 17-19, 22, 27］}
SA	205.7	58.8	203.1	52.1	169.2~239.9	53.3~74.5	158.5~226.7	51.9~67.5^{［12-13, 16-24, 26-27］}

材料	实验测试值				文献参考值
材料	H_0m/J·g^-1	T_rm/℃	H_0f/J·g^-1	T_rf/℃	H_0m/J·g^-1	T_rm/℃	H_0f/J·g^-1	T_rf /℃
LA	196.2	46.7	185.1	39.7	169.6~222.3	43.4~47.4	172.5~185.3	41.0~42.5^{［5-6, 17-18, 20, 22-23］}
MA	161.5	62.9	153.3	52.7	179.8~248.8	51.6~56.1	184.9~242.6	50.1~53.0^{［7-8, 17-20, 22］}
PA	224.8	65.9	220.8	57.4	183.4~275.4	61.1~64.9	176.8~284.2	59.3~60.9^{［1, 9-11, 17-19, 22, 27］}
SA	205.7	58.8	203.1	52.1	169.2~239.9	53.3~74.5	158.5~226.7	51.9~67.5^{［12-13, 16-24, 26-27］}

材料	AC/LA										AC/LA/10%石墨
材料	H_1m/J·g^-1	H_1f/J·g^-1	E/%	ω₀/%	ω₁/%	H_1m/J·g^-1	H_1f/J·g^-1	E/%	ω₀/%	ω₁/%	H_1m/J·g^-1	H_1f/J·g^-1	E/%	ω₀/%	ω₁/%
AC1	56.14	52.88	75.24	38	28.59	52.55	48.14	75.50	34.96	26.39	39.8	36.4	58.41	34.20	19.97
AC2	73.93	72.53	85.41	45	38.43	63.95	60.89	79.09	41.40	32.74	52.00	49.52	65.75	40.50	26.63
AC3	75.21	72.39	77.44	50	38.72	70.55	66.07	77.88	46.00	35.83	52.69	48.95	59.22	45.00	26.65
AC4	95.18	91.88	90.88	54	49.07	81.73	77.77	84.21	49.68	41.84	65.64	63.83	69.90	48.60	33.97