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Ahmet Sari - One of the best experts on this subject based on the ideXlab platform.
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polystyrene microcapsules with palmitic capric acid Eutectic Mixture as building thermal energy storage materials
Energy and Buildings, 2017Co-Authors: Derya Kahraman Doguscu, Ahmet Sari, Ayse Altintas, Cemil AlkanAbstract:Abstract In this study, palmitic acid (PA) and capric acid (CA) Eutectic Mixture was encapsulated in polystyrene (PS) capsules as new latent heat thermal energy storage (LHTES) material for building applications. Eutectic composition ratio of the Mixture was determined experimentally. Microencapsulated Eutectic Mixtures (MEEMs) were prepared in homogenized emulsions in 3 different PS/(PA-CA) weight ratios. The synthesis reaction was found complete according to Fourier Transformed Infrared (FT-IR) Spectroscopy. The physical and physicochemical characteristics, thermal endurance limits and operating stability of MEEMs were investigated through differential scanning calorimetry, thermal gravimetry, and thermal conductivity, particle size distribution analysis, scanning electron microscopy, and polarized optical microscopy techniques. The onsets of melting of MEEMs were measured between 13.5 and 17.1 °C as those of crystallization were between 16.9 and 17.9 °C. The latent heats of melting of MEEMs were measured between 46.3 and 77.3 J/g as those of crystallization were between −45.0 and −73.6 J/g. As a result, a Eutectic Mixture of PA and CA was depicted for building heating cooling applications and successfully encapsulated in PS shell at different weight ratios.
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micro nano encapsulated n tetracosane and n octadecane Eutectic Mixture with polystyrene shell for low temperature latent heat thermal energy storage applications
Solar Energy, 2015Co-Authors: Ahmet Sari, Derya Kahraman Doguscu, Cemil Alkan, Cinar KizilAbstract:Abstract A series of micro/nano capsules of polystyrene(PS)/tetracosane(C24)–octadecane(C18) Eutectic Mixture were synthesized as encapsulated phase change material (PCM) using emulsion polymerization method. The encapsulated PCMs were characterized chemically using FT-IR spectroscopy. The surface morphology and particle size of the synthesized capsules were investigated POM, SEM and PSD techniques. The results proved that the surfaces of the capsules had not completely spherical appearances and bimodal particle size distributions changed within 0.01–115 μm. The thermal characteristics measured using DSC and TGA techniques indicated that the capsules containing highest amount of the Eutectic Mixture had a melting temperature of 25.96 °C, latent heat of 156.39 J g−1 and high thermal durability. The thermal cycling test confirmed that the PS/(C24–C18) micro/nano capsules with 1:2 shell/core ratio had good thermal reliability after 5000 thermal cycling number. Furthermore, the synthesized PS/(C24–C18)(1:2) micro/nano capsules had a considerable high thermal conductivity. By taking account of all results, it can be drawn a conclusion that especially PS/(C24–C18)(1:2) micro/nano capsules can be considered as promising encapsulated PCM for low-temperature latent heat thermal energy storage applications.
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synthesis and characterization of micro nano capsules of pmma capric stearic acid Eutectic Mixture for low temperature thermal energy storage in buildings
Energy and Buildings, 2015Co-Authors: Ahmet Sari, Cemil Alkan, Aysegul Nazli OzcanAbstract:Abstract In this work, polymethylmethacrylate(PMMA)/capric–stearic Eutectic Mixture (C-SEM) micro/nano capsules were synthesized effectively using emulsion polymerization method. POM and SEM analysis results showed that the synthesized PMMA/C-SEM micro/nano capsules were consisted with spherical shape with uniform structure. The PSD analysis indicated that the mean diameter of the capsules was 1.3 μm and 28.1%-part of the capsules can be characterized as nano-sized spheres. DSC analysis exposed that the synthesized PMMA/C-SEM (1:2) micro/nano capsules has a melting temperature of 21.37 °C, which can be suitable for free cooling of buildings depending on the climatic conditions. It has a latent heat of melting of 116.25 J/g, which can be enough to integrate with conventional building materials. TGA results exhibited that the thermal degradation temperature of the micro/nano capsules is very much higher its melting temperature. Moreover, the synthesized PMMA/C-SEM micro/nano capsules have good thermal reliability, chemical stability and thermal conductivity. By taking into consideration all results, it can be also concluded that the micro/nano encapsulated C-SEM can be used to fabricate new building components.
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preparation and thermal properties of capric acid palmitic acid Eutectic Mixture as a phase change energy storage material
Materials Letters, 2008Co-Authors: Ahmet Sari, Ali KaraipekliAbstract:Abstract This study focuses on the preparation, thermal properties and thermal reliability of capric acid (CA)/palmitic acid (PA) Mixture as phase change material (PCM) for low temperature latent heat thermal energy storage (LHTES). The differential scanning calorimetry (DSC) results indicated that the CA/PA Mixture with Eutectic composition (76.5/23.5 wt.%) was suitable PCM for low temperature LHTES applications in terms of melting and freezing temperatures (Tm = 21.85 °C; Tf = 22.15 °C) and latent heats of melting and freezing (ΔHm = 171.22 J/g; ΔHf = 173.16 J/g). The thermal properties make it potential PCM for LHTES systems used in heating, ventilation, and air conditioning applications. Accelerated thermal cycling tests showed that the Eutectic Mixture as a PCM has good long-term thermal reliability. The probable reasons of the changes occurred in thermal properties of the PCM during accelerated thermal cycling were also investigated using Fourier Transform Infrared (FT-IR) spectroscopy method.
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capric acid and palmitic acid Eutectic Mixture applied in building wallboard for latent heat thermal energy storage
Journal of Scientific & Industrial Research, 2007Co-Authors: Ali Karaipekli, Ahmet SariAbstract:The paper aims: (1) preparation of the phase change gypsum wallboard as novel phase change wallboard (PCW) incorporating with the Eutectic Mixture of capric acid (CA) and palmitic acid (PA) for latent heat thermal energy storage; (2) determination of thermal properties and thermal reliability of prepared PCW using differential scanning calorimetry (DSC) technique; and (3) estimation of thermal performance of PCW by preparing a simple test cell. Maximum CA/PA Eutectic Mixture as phase change material absorbed in PCW was about 25 wt% of total weight. No leakage of the Mixture from PCW was observed after 5000 thermal cycling. The melting and freezing temperatures and latent heats of PCW were measured as 22.94 and 21.66°C, 42.54 and 42.18 J/g, respectively by DSC analysis. These properties make it functional as TES medium, which can be applied to peak load shifting, improved use of waste heat and solar energy as well as more efficient operation of heating and cooling equipment. In addition, PCW has good thermal reliability in terms of the changes in its thermal properties after accelerated 1000, 2000, 3000, 4000, and 5000 thermal cycling. Use of such PCW can decrease indoor air fluctuation and have the function of keeping warmth to improve indoor thermal comfort due to absorption of heat in conjunction with melting of the Eutectic Mixture.
Yongzhong Jia - One of the best experts on this subject based on the ideXlab platform.
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a novel low temperature phase change material based on stearic acid and hexanamide Eutectic Mixture for thermal energy storage
Chemical Physics Letters, 2019Co-Authors: Jinhe Sun, Yue Zhang, Yan Jing, Yongzhong JiaAbstract:Abstract The stearic acid (SA) – hexanamide (HA) binary Mixtures were prepared, and the phase diagram and Tammann plot were constructed. The differential scanning calorimetry results indicated that a Eutectic composition formed by 46.2 mol% SA and 53.8 mol% HA melted at the temperature of 331.15 K with a latent heat of 176.62 J·g−1. Fourier transform infrared spectroscopy and X-ray diffraction results revealed that SA and HA were just physical Mixture. The results of thermogravimetric analysis and 100 thermal cycles test respectively manifested that Eutectic Mixture had good thermal stability and reliability. Therefore, Eutectic Mixture is promising for thermal energy storage application.
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preparation and thermal properties of stearic acid benzamide Eutectic Mixture expanded graphite composites as phase change materials for thermal energy storage
Powder Technology, 2019Co-Authors: Jinhe Sun, Yue Zhang, Yan Jing, Yongzhong JiaAbstract:Abstract A series of stearic acid (SA)/benzamide (BA) binary Mixtures were prepared and demonstrated, and then the phase diagram and Tammann plot were established. The results showed that the molar fraction of SA in SA-BA Eutectic Mixture was 0.757. The Eutectic Mixture melted at 339.05 K with 200.15 J·g−1 latent heat. Expanded graphite (EG) was added to Eutectic Mixture to form composite phase change materials (PCMs) owing to the Eutectic Mixture has low thermal conductivity. It was found that the binary Mixture and EG had good chemical compatibility, and the thermal conductivity of the composite with 12 wt% EG was significant increased by 12.30 times compared to Eutectic Mixture. Besides, the phase change properties of Eutectic Mixture/12 wt% EG composite phase change material (PCM) had a little change after 100 thermal cycles, and had negligible mass loss after leakage test. These results demonstrated that the composite PCM had good thermal reliability and stability. Based on the above results, the composite PCM has great potential in thermal energy storage application.
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preparation and properties of stearic acid acetanilide Eutectic Mixture expanded graphite composite phase change material for thermal energy storage
Energy technology, 2018Co-Authors: Zhao Wang, Jinhe Sun, Yongzhong Jia, Shaolei Xie, Yan JingAbstract:In this study, a series of binary Mixtures of stearic acid (SA) and acetanilide (AA) at various mass fractions were prepared. A novel binary Mixture of SA and AA in the ratio of 81.0:19.0 mol% is shown to be an Eutectic Mixture with melting temperature of 342.45 ± 0.25 K, melting latent heat of 220.04 ± 10.02 J·g-1. In order to improve the thermal properties of SA-AA Eutectic Mixture so as to obtain a better composite phase change materials (CPCM) with high thermal conductivity, large heat storage capacity, good thermal stability and reliability for heat energy storage, expanded graphite (EG) at different mass fractions is added into SA-AA Eutectic Mixture. The results exhibited it remarkable energy storage capacity with a latent heat of CPCM of 176.14 J·g-1 compared to most of the organic Eutectic Mixture composite. The thermal conductivity of the CPCM was enhanced by 14.5 times comparing to SA-AA Eutectic Mixture. And the thermo-physical properties of the SA-AA/EG CPCM after 100 accelerated thermal cycles were slightly decreased which did not distinct influence on heat storage. Thus, the prepared SA-AA/EG CPCM is a promising material for latent heat storage systems.
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thermal properties and stabilities of the Eutectic Mixture 1 6 hexanediol lauric acid as a phase change material for thermal energy storage
Applied Thermal Engineering, 2017Co-Authors: Lipeng Han, Jinhe Sun, Yongzhong Jia, Shaolei Xie, Yan JingAbstract:Abstract Thermal properties and stabilities of the Eutectic Mixture: 1,6-hexanediol (HE) and lauric acid (LA) as a new phase change material (PCM) for latent heat thermal energy storage (TES) were investigated. Differential scanning calorimetry (DSC) results indicated that the aforementioned HE/LA Mixture with Eutectic composition (70/30 wt.%) was a suitable PCM in terms of melting point (Tpeak = 36.92 ± 0.71 °C) and latent heat of fusion (ΔHm = 177.11 ± 7.93 J g−1). After 1000 thermal cycles, the change in melting point for the Eutectic Mixture was in the range of −0.49% to −1.19%, and the change in latent heat of fusion was in the range of −0.22% to −3.24%. The Eutectic Mixture was thermally and chemically stable according to results of thermogravimetric analysis (TGA), volatile test and Fourier Transform Infrared (FT-IR) spectroscopic analysis. Therefore, the HE/LA Eutectic Mixture is an effective TES material to reduce energy consumption.
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thermal properties and reliability of Eutectic Mixture of stearic acid acetamide as phase change material for latent heat storage
The Journal of Chemical Thermodynamics, 2017Co-Authors: Lipeng Han, Jinhe Sun, Yongzhong JiaAbstract:Abstract The thermal properties and reliability of the stearic acid (SA) with acetamide (AC) binary Mixture were characterized using differential scanning calorimetry (DSC), powder X-ray diffraction (XRD), thermogravimetric analysis (TG) and Fourier transform infrared spectroscopy (FT-IR). The phase diagrams for the SA-AC binary Mixture with AC in the metastable and the stable form were constructed. The Eutectic system with stable AC is 0.604 mol fraction SA, and displayed a melting temperature ( T m ) of 64.55 °C and latent heat of melting (Δ H m ) of 193.87 J·g −1 . The Eutectic systems with metastable AC are 0.397 and 0.604 mol fraction SA. The melting temperatures are 62.23 °C and 62.54 °C, and latent heats of fusion are 222.10 J·g −1 and 194.28 J·g −1 , respectively. Following accelerated thermal cycling tests, TG and FT-IR analysis indicate that the Eutectic Mixture (χ SA = 0.397) with the metastable AC has good cyclic and thermal stability. The results show that the SA-AC Eutectic Mixture use as phase change material (PCM) possess good prospect for low temperature thermal energy storage (TES) applications.
Zhengguo Zhang - One of the best experts on this subject based on the ideXlab platform.
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growth of the phase change enthalpy induced by the crystal transformation of an inorganic organic Eutectic Mixture of magnesium nitrate hexahydrate glutaric acid
Industrial & Engineering Chemistry Research, 2020Co-Authors: Shao Lin, Ziye Ling, Xiaoming Fang, Zhengguo ZhangAbstract:Developing phase change materials (PCMs) with high latent heat is significant for latent heat storage technology. Herein, an inorganic-organic Eutectic Mixture PCM of Mg(NO3)2•6H2O (MNH) and glutar...
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fabrication and characterization of form stable capric palmitic stearic acid ternary Eutectic Mixture nano sio2 composite phase change material
Energy and Buildings, 2017Co-Authors: Zigeng Luo, Xuenong Gao, Hua Zhang, Yutang Fang, Zhengguo ZhangAbstract:Abstract Phase change materials (PCMs) have great potential for the regulation of indoor temperature and building energy saving. In this study, capric acid-palmitic acid-stearic acid (CA-PA-SA) ternary Eutectic Mixture was impregnated into nano-silicon dioxide (nano-SiO2) to prepare a form-stable composite PCM (CA-PA-SA/nano-SiO2). The phase change temperature range of the composite PCM is 17.16 °C–26 °C, which is suitable for indoor thermal environment. The high latent heat value and the low thermal conductivity of the composite PCM are 99.43 kJ kg−1 and 0.08239 W (m K)−1, which is helpful to stabilize the indoor temperature for a long time and improve human comfort. Furthermore, after 500 heating/cooling cycles, the composite PCM showed good thermal and chemical stability. The maximum CA-PA-SA mass fraction of the composite PCM was determined as high as 75 wt.%, with no melted CA-PA-SA seeping from the composite PCM. All the results indicated that the composite PCM is suitable for storing excess solar radiation and reducing the amount and rate of heat loss of buildings in the winter, which will help reduce building energy consumption.
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a capric palmitic stearic acid ternary Eutectic Mixture expanded graphite composite phase change material for thermal energy storage
Composites Part A-applied Science and Manufacturing, 2016Co-Authors: Hua Zhang, Xuenong Gao, Caixing Chen, Yutang Fang, Zhengguo ZhangAbstract:Abstract This paper demonstrated a capric acid–palmitic acid–stearic acid ternary Eutectic Mixture/expanded graphite (CA–PA–SA/EG) composite phase change material (PCM) for low-temperature heat storage. The CA–PA–SA ternary Eutectic Mixture with a mass ratio of CA:PA:SA = 79.3:14.7:6.0 was prepared firstly, and its mass ratio in the CA–PA–SA/EG composite can reach as high as 90%. The melting and freezing temperatures of CA–PA–SA/EG composite were 21.33 °C and 19.01 °C, and the corresponding latent heat were 131.7 kJ kg −1 and 127.2 kJ kg −1 . The CA–PA–SA/EG composite powders can be formed into round blocks by dry pressing easily, with much higher thermal conductivity than CA–PA–SA. Thermal performance test showed that the increasing thermal conductivity of CA–PA–SA could obviously decrease the melting/cooling time. Thermal property characterizations after 500 heating/cooling cycles test indicated that CA–PA–SA/EG composite PCM had excellent thermal reliability. Based on all these results, CA–PA–SA/EG composite PCM is a promising material for low-temperature thermal energy storage applications.
Jinhe Sun - One of the best experts on this subject based on the ideXlab platform.
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a novel low temperature phase change material based on stearic acid and hexanamide Eutectic Mixture for thermal energy storage
Chemical Physics Letters, 2019Co-Authors: Jinhe Sun, Yue Zhang, Yan Jing, Yongzhong JiaAbstract:Abstract The stearic acid (SA) – hexanamide (HA) binary Mixtures were prepared, and the phase diagram and Tammann plot were constructed. The differential scanning calorimetry results indicated that a Eutectic composition formed by 46.2 mol% SA and 53.8 mol% HA melted at the temperature of 331.15 K with a latent heat of 176.62 J·g−1. Fourier transform infrared spectroscopy and X-ray diffraction results revealed that SA and HA were just physical Mixture. The results of thermogravimetric analysis and 100 thermal cycles test respectively manifested that Eutectic Mixture had good thermal stability and reliability. Therefore, Eutectic Mixture is promising for thermal energy storage application.
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preparation and thermal properties of stearic acid benzamide Eutectic Mixture expanded graphite composites as phase change materials for thermal energy storage
Powder Technology, 2019Co-Authors: Jinhe Sun, Yue Zhang, Yan Jing, Yongzhong JiaAbstract:Abstract A series of stearic acid (SA)/benzamide (BA) binary Mixtures were prepared and demonstrated, and then the phase diagram and Tammann plot were established. The results showed that the molar fraction of SA in SA-BA Eutectic Mixture was 0.757. The Eutectic Mixture melted at 339.05 K with 200.15 J·g−1 latent heat. Expanded graphite (EG) was added to Eutectic Mixture to form composite phase change materials (PCMs) owing to the Eutectic Mixture has low thermal conductivity. It was found that the binary Mixture and EG had good chemical compatibility, and the thermal conductivity of the composite with 12 wt% EG was significant increased by 12.30 times compared to Eutectic Mixture. Besides, the phase change properties of Eutectic Mixture/12 wt% EG composite phase change material (PCM) had a little change after 100 thermal cycles, and had negligible mass loss after leakage test. These results demonstrated that the composite PCM had good thermal reliability and stability. Based on the above results, the composite PCM has great potential in thermal energy storage application.
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preparation and properties of stearic acid acetanilide Eutectic Mixture expanded graphite composite phase change material for thermal energy storage
Energy technology, 2018Co-Authors: Zhao Wang, Jinhe Sun, Yongzhong Jia, Shaolei Xie, Yan JingAbstract:In this study, a series of binary Mixtures of stearic acid (SA) and acetanilide (AA) at various mass fractions were prepared. A novel binary Mixture of SA and AA in the ratio of 81.0:19.0 mol% is shown to be an Eutectic Mixture with melting temperature of 342.45 ± 0.25 K, melting latent heat of 220.04 ± 10.02 J·g-1. In order to improve the thermal properties of SA-AA Eutectic Mixture so as to obtain a better composite phase change materials (CPCM) with high thermal conductivity, large heat storage capacity, good thermal stability and reliability for heat energy storage, expanded graphite (EG) at different mass fractions is added into SA-AA Eutectic Mixture. The results exhibited it remarkable energy storage capacity with a latent heat of CPCM of 176.14 J·g-1 compared to most of the organic Eutectic Mixture composite. The thermal conductivity of the CPCM was enhanced by 14.5 times comparing to SA-AA Eutectic Mixture. And the thermo-physical properties of the SA-AA/EG CPCM after 100 accelerated thermal cycles were slightly decreased which did not distinct influence on heat storage. Thus, the prepared SA-AA/EG CPCM is a promising material for latent heat storage systems.
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thermal properties and stabilities of the Eutectic Mixture 1 6 hexanediol lauric acid as a phase change material for thermal energy storage
Applied Thermal Engineering, 2017Co-Authors: Lipeng Han, Jinhe Sun, Yongzhong Jia, Shaolei Xie, Yan JingAbstract:Abstract Thermal properties and stabilities of the Eutectic Mixture: 1,6-hexanediol (HE) and lauric acid (LA) as a new phase change material (PCM) for latent heat thermal energy storage (TES) were investigated. Differential scanning calorimetry (DSC) results indicated that the aforementioned HE/LA Mixture with Eutectic composition (70/30 wt.%) was a suitable PCM in terms of melting point (Tpeak = 36.92 ± 0.71 °C) and latent heat of fusion (ΔHm = 177.11 ± 7.93 J g−1). After 1000 thermal cycles, the change in melting point for the Eutectic Mixture was in the range of −0.49% to −1.19%, and the change in latent heat of fusion was in the range of −0.22% to −3.24%. The Eutectic Mixture was thermally and chemically stable according to results of thermogravimetric analysis (TGA), volatile test and Fourier Transform Infrared (FT-IR) spectroscopic analysis. Therefore, the HE/LA Eutectic Mixture is an effective TES material to reduce energy consumption.
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thermal properties and reliability of Eutectic Mixture of stearic acid acetamide as phase change material for latent heat storage
The Journal of Chemical Thermodynamics, 2017Co-Authors: Lipeng Han, Jinhe Sun, Yongzhong JiaAbstract:Abstract The thermal properties and reliability of the stearic acid (SA) with acetamide (AC) binary Mixture were characterized using differential scanning calorimetry (DSC), powder X-ray diffraction (XRD), thermogravimetric analysis (TG) and Fourier transform infrared spectroscopy (FT-IR). The phase diagrams for the SA-AC binary Mixture with AC in the metastable and the stable form were constructed. The Eutectic system with stable AC is 0.604 mol fraction SA, and displayed a melting temperature ( T m ) of 64.55 °C and latent heat of melting (Δ H m ) of 193.87 J·g −1 . The Eutectic systems with metastable AC are 0.397 and 0.604 mol fraction SA. The melting temperatures are 62.23 °C and 62.54 °C, and latent heats of fusion are 222.10 J·g −1 and 194.28 J·g −1 , respectively. Following accelerated thermal cycling tests, TG and FT-IR analysis indicate that the Eutectic Mixture (χ SA = 0.397) with the metastable AC has good cyclic and thermal stability. The results show that the SA-AC Eutectic Mixture use as phase change material (PCM) possess good prospect for low temperature thermal energy storage (TES) applications.
Yan Jing - One of the best experts on this subject based on the ideXlab platform.
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a novel low temperature phase change material based on stearic acid and hexanamide Eutectic Mixture for thermal energy storage
Chemical Physics Letters, 2019Co-Authors: Jinhe Sun, Yue Zhang, Yan Jing, Yongzhong JiaAbstract:Abstract The stearic acid (SA) – hexanamide (HA) binary Mixtures were prepared, and the phase diagram and Tammann plot were constructed. The differential scanning calorimetry results indicated that a Eutectic composition formed by 46.2 mol% SA and 53.8 mol% HA melted at the temperature of 331.15 K with a latent heat of 176.62 J·g−1. Fourier transform infrared spectroscopy and X-ray diffraction results revealed that SA and HA were just physical Mixture. The results of thermogravimetric analysis and 100 thermal cycles test respectively manifested that Eutectic Mixture had good thermal stability and reliability. Therefore, Eutectic Mixture is promising for thermal energy storage application.
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preparation and thermal properties of stearic acid benzamide Eutectic Mixture expanded graphite composites as phase change materials for thermal energy storage
Powder Technology, 2019Co-Authors: Jinhe Sun, Yue Zhang, Yan Jing, Yongzhong JiaAbstract:Abstract A series of stearic acid (SA)/benzamide (BA) binary Mixtures were prepared and demonstrated, and then the phase diagram and Tammann plot were established. The results showed that the molar fraction of SA in SA-BA Eutectic Mixture was 0.757. The Eutectic Mixture melted at 339.05 K with 200.15 J·g−1 latent heat. Expanded graphite (EG) was added to Eutectic Mixture to form composite phase change materials (PCMs) owing to the Eutectic Mixture has low thermal conductivity. It was found that the binary Mixture and EG had good chemical compatibility, and the thermal conductivity of the composite with 12 wt% EG was significant increased by 12.30 times compared to Eutectic Mixture. Besides, the phase change properties of Eutectic Mixture/12 wt% EG composite phase change material (PCM) had a little change after 100 thermal cycles, and had negligible mass loss after leakage test. These results demonstrated that the composite PCM had good thermal reliability and stability. Based on the above results, the composite PCM has great potential in thermal energy storage application.
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preparation and properties of stearic acid acetanilide Eutectic Mixture expanded graphite composite phase change material for thermal energy storage
Energy technology, 2018Co-Authors: Zhao Wang, Jinhe Sun, Yongzhong Jia, Shaolei Xie, Yan JingAbstract:In this study, a series of binary Mixtures of stearic acid (SA) and acetanilide (AA) at various mass fractions were prepared. A novel binary Mixture of SA and AA in the ratio of 81.0:19.0 mol% is shown to be an Eutectic Mixture with melting temperature of 342.45 ± 0.25 K, melting latent heat of 220.04 ± 10.02 J·g-1. In order to improve the thermal properties of SA-AA Eutectic Mixture so as to obtain a better composite phase change materials (CPCM) with high thermal conductivity, large heat storage capacity, good thermal stability and reliability for heat energy storage, expanded graphite (EG) at different mass fractions is added into SA-AA Eutectic Mixture. The results exhibited it remarkable energy storage capacity with a latent heat of CPCM of 176.14 J·g-1 compared to most of the organic Eutectic Mixture composite. The thermal conductivity of the CPCM was enhanced by 14.5 times comparing to SA-AA Eutectic Mixture. And the thermo-physical properties of the SA-AA/EG CPCM after 100 accelerated thermal cycles were slightly decreased which did not distinct influence on heat storage. Thus, the prepared SA-AA/EG CPCM is a promising material for latent heat storage systems.
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thermal properties and stabilities of the Eutectic Mixture 1 6 hexanediol lauric acid as a phase change material for thermal energy storage
Applied Thermal Engineering, 2017Co-Authors: Lipeng Han, Jinhe Sun, Yongzhong Jia, Shaolei Xie, Yan JingAbstract:Abstract Thermal properties and stabilities of the Eutectic Mixture: 1,6-hexanediol (HE) and lauric acid (LA) as a new phase change material (PCM) for latent heat thermal energy storage (TES) were investigated. Differential scanning calorimetry (DSC) results indicated that the aforementioned HE/LA Mixture with Eutectic composition (70/30 wt.%) was a suitable PCM in terms of melting point (Tpeak = 36.92 ± 0.71 °C) and latent heat of fusion (ΔHm = 177.11 ± 7.93 J g−1). After 1000 thermal cycles, the change in melting point for the Eutectic Mixture was in the range of −0.49% to −1.19%, and the change in latent heat of fusion was in the range of −0.22% to −3.24%. The Eutectic Mixture was thermally and chemically stable according to results of thermogravimetric analysis (TGA), volatile test and Fourier Transform Infrared (FT-IR) spectroscopic analysis. Therefore, the HE/LA Eutectic Mixture is an effective TES material to reduce energy consumption.
