Eutectic Fatty Acids Phase Change Materials Improved with Expanded Graphite
Low- and ultra-low-grade thermal energy have significant recycling value for energy saving and carbon footprint reduction. Efficient thermal energy storage technology based on phase change materials (PCMs) will help improve heat recovery. This study aimed to develop a composite eutectic fatty acid o...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-10-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/19/6856 |
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| author | Zanshe Wang Guoqiang Huang Zhaoying Jia Qi Gao Yanping Li Zhaolin Gu |
| author_facet | Zanshe Wang Guoqiang Huang Zhaoying Jia Qi Gao Yanping Li Zhaolin Gu |
| author_sort | Zanshe Wang |
| collection | DOAJ |
| description | Low- and ultra-low-grade thermal energy have significant recycling value for energy saving and carbon footprint reduction. Efficient thermal energy storage technology based on phase change materials (PCMs) will help improve heat recovery. This study aimed to develop a composite eutectic fatty acid of lauric acid (LA) and stearic acid (SA) binary system with expanded graphite (EG). The experimental measured eutectic temperature was 31.2 °C with an LA-to-SA mass ratio of 7:3. Afterwards, 1~15 wt.% EG was composited to the eutectic acid, and the thermophysical properties of the composite PCMs were measured by differential scanning calorimetry (DSC) and transient plane source (TPS) methods. The results demonstrated that the phase transition temperature and latent heat of the composite PCMs were stable when the content of EG was more than 5%, and the thermal conductivity and thermal diffusion coefficient of the composite PCMs (10–15 wt.%) increased by 2.4–2.6 and 3.2–3.7 times compared with the pure eutectic acid, respectively. On this basis, a finned-coil-type reservoir was prepared, and an experimental study of heat storage and heat release performance was carried out. The results showed that the heat storage and heat release effects of the heat reservoir were the best when the EG ratio was 10 wt.%. The heat storage time was reduced by 20.4%, 8.1%, and 6.2% compared with the other three EG ratios, respectively; meanwhile, the heat release time was reduced by 19.3%, 6.7%, and 5.3%, respectively. |
| first_indexed | 2024-03-09T21:30:06Z |
| format | Article |
| id | doaj.art-0668489054e04bb9a392d88a1d05a942 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T21:30:06Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-0668489054e04bb9a392d88a1d05a9422023-11-23T20:57:57ZengMDPI AGMaterials1996-19442022-10-011519685610.3390/ma15196856Eutectic Fatty Acids Phase Change Materials Improved with Expanded GraphiteZanshe Wang0Guoqiang Huang1Zhaoying Jia2Qi Gao3Yanping Li4Zhaolin Gu5School of Human Settlement and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaSchool of Human Settlement and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaSchool of Human Settlement and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaSchool of Human Settlement and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaSchool of Human Settlement and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaSchool of Human Settlement and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaLow- and ultra-low-grade thermal energy have significant recycling value for energy saving and carbon footprint reduction. Efficient thermal energy storage technology based on phase change materials (PCMs) will help improve heat recovery. This study aimed to develop a composite eutectic fatty acid of lauric acid (LA) and stearic acid (SA) binary system with expanded graphite (EG). The experimental measured eutectic temperature was 31.2 °C with an LA-to-SA mass ratio of 7:3. Afterwards, 1~15 wt.% EG was composited to the eutectic acid, and the thermophysical properties of the composite PCMs were measured by differential scanning calorimetry (DSC) and transient plane source (TPS) methods. The results demonstrated that the phase transition temperature and latent heat of the composite PCMs were stable when the content of EG was more than 5%, and the thermal conductivity and thermal diffusion coefficient of the composite PCMs (10–15 wt.%) increased by 2.4–2.6 and 3.2–3.7 times compared with the pure eutectic acid, respectively. On this basis, a finned-coil-type reservoir was prepared, and an experimental study of heat storage and heat release performance was carried out. The results showed that the heat storage and heat release effects of the heat reservoir were the best when the EG ratio was 10 wt.%. The heat storage time was reduced by 20.4%, 8.1%, and 6.2% compared with the other three EG ratios, respectively; meanwhile, the heat release time was reduced by 19.3%, 6.7%, and 5.3%, respectively.https://www.mdpi.com/1996-1944/15/19/6856phase change materialseutectic fatty acidsexpanded graphiteultra-low-grade energythermal energy storage |
| spellingShingle | Zanshe Wang Guoqiang Huang Zhaoying Jia Qi Gao Yanping Li Zhaolin Gu Eutectic Fatty Acids Phase Change Materials Improved with Expanded Graphite Materials phase change materials eutectic fatty acids expanded graphite ultra-low-grade energy thermal energy storage |
| title | Eutectic Fatty Acids Phase Change Materials Improved with Expanded Graphite |
| title_full | Eutectic Fatty Acids Phase Change Materials Improved with Expanded Graphite |
| title_fullStr | Eutectic Fatty Acids Phase Change Materials Improved with Expanded Graphite |
| title_full_unstemmed | Eutectic Fatty Acids Phase Change Materials Improved with Expanded Graphite |
| title_short | Eutectic Fatty Acids Phase Change Materials Improved with Expanded Graphite |
| title_sort | eutectic fatty acids phase change materials improved with expanded graphite |
| topic | phase change materials eutectic fatty acids expanded graphite ultra-low-grade energy thermal energy storage |
| url | https://www.mdpi.com/1996-1944/15/19/6856 |
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