Thermodynamic properties of C8H18-C11H24 mixed alkane system phase change materials

doi:10.19799/j.cnki.2095-4239.2022.0031

Abstract

Abstract:

Mixed alkane is a type of cryogenic phase change material (PCM) with superior performance, because of its adjustable phase change temperature and high phase change enthalpy. Currently, however, there are few studies on low-temperature mixed alkane systems. The thermodynamic properties of of C₈H₁₈, C₉H₂₀, C₁₀H₂₂ and C₁₁H₂₄ binary mixed alkanes systems are investigated. The solid-liquid phase diagram is drawn after studying the influence law of the phase transition temperature, phase transition enthalpy, and composition of the mixed alkane system. Different thermodynamic models predict the binary mixture's phase transition temperature and phase transition enthalpy, and the experimental results are mutually verified. The results show that C₉-C₁₀ and C₉-C₁₁ systems exhibit eutectic behavior, with the eutectic components being 88%C₉ (weight percentage)-12%C₁₀ and 90%C₉-10%C₁₁. The eutectic temperatures are 218.25 K and 215.15 K, respectively. Peritectic phenomena occur in the C₈-C₉ system, while isomorphous phenomena occur in the C₁₀-C₁₁ system. Their minimum melting points are 200.25 K and 234.35 K, respectively. Furthermore, the melting temperatures predicted by the UNIQUAC model are in better agreement with experimental data of C₈-C₉ and C₉-C₁₀ systems. The UNIFAC melting temperature model produces more accurate results for C₉-C₁₁ and C₁₀-C₁₁ systems. The Regular solution model can predict the melting enthalpy more accurately, and the average relative deviation is lower. As a result, the C₉-C₁₀ and C₉-C₁₁ eutectic systems are low-temperature phase change materials suitable for temperatures ranging from 210 K to 220 K, providing data for their use in low-temperature energy storage.

Key words: phase change materials, alkane, thermodynamics, solid-liquid phase diagrams, eutectic, peritectic

CLC Number:

TK 02

JIANG Chengyi, ZHONG Zunrui, WU Zide, PENG Hao. Thermodynamic properties of C₈H₁₈-C₁₁H₂₄ mixed alkane system phase change materials[J]. Energy Storage Science and Technology, 2022, 11(6): 1957-1967.

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纯烷烃	熔点/K			熔化焓/(J/g)
纯烷烃	实验	文献	误差	实验	文献	误差
C₈	216.35	216.3	0.02%	182.8	181.0	0.99%
C₉	219.65	219.6	0.02%	130.3	121.0	7.69%
C₁₀	242.25	243.5	0.51%	184.4	202.0	8.71%
C₁₁	246.35	247.7	0.55%	139.0	142.0	2.11%

混合体系	平均相对偏差/%
	熔化温度			熔化焓
	Ideal	UNIQUAC	UNIFAC	Eutectic	Regular solution
C₈-C₉	1.45	0.91	1.34	14.26	8.68
C₉-C₁₀	1.96	1.79	1.95	15.42	8.54
C₉-C₁₁	1.18	1.20	1.14	12.64	6.70
C₁₀-C₁₁	0.82	1.31	0.80	17.88	9.66

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Thermodynamic properties of C₈H₁₈-C₁₁H₂₄ mixed alkane system phase change materials

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