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Preparation and thermal properties of octyl, decyl, dodecyl and tetradecyl stearates as phase change materials for thermal energy storage
AbstractA homologous series of n-alkyl stearates CnS (C17H35COO(CH2)n-1CH3, n=8, 10, 12, 14) was synthesized as solid-liquid phase change materials (PCMs) by esterification of stearic acid with 1-octanol, 1-decanol, 1-dodecanol and 1-tetradecanol. Molecular structures of CnS were confirmed by fourier transform infrared (FT-IR) and 1H nuclear magnetic resonance (1H NMR) spectra. Differential scanning calorimetry (DSC) measurements revealed that the melting temperatures of CnS were in the range of 21.4∼44.4°C and increased with the increase in alkyl chain length. The latent heats of fusion were in the range of 165.8∼191.1kJkg−1. The comparable solidifying temperatures and latent heats of solidification were also observed. The phase change temperatures and latent heats changed little after repeated melting/solidifying cycles. Thermogravimetric analysis suggested that CnS was thermally stable at temperatures up to 215°C. The volumetric latent heat storage capacities of CnS ranged from 146 to 159MJm−3. The latent heat storage/release performance of CnS in a ceramic cell suggested the potential application of the n-alkyl stearates for passive thermal energy storage to reduce the indoor temperature fluctuation.
Preparation and thermal properties of octyl, decyl, dodecyl and tetradecyl stearates as phase change materials for thermal energy storage
AbstractA homologous series of n-alkyl stearates CnS (C17H35COO(CH2)n-1CH3, n=8, 10, 12, 14) was synthesized as solid-liquid phase change materials (PCMs) by esterification of stearic acid with 1-octanol, 1-decanol, 1-dodecanol and 1-tetradecanol. Molecular structures of CnS were confirmed by fourier transform infrared (FT-IR) and 1H nuclear magnetic resonance (1H NMR) spectra. Differential scanning calorimetry (DSC) measurements revealed that the melting temperatures of CnS were in the range of 21.4∼44.4°C and increased with the increase in alkyl chain length. The latent heats of fusion were in the range of 165.8∼191.1kJkg−1. The comparable solidifying temperatures and latent heats of solidification were also observed. The phase change temperatures and latent heats changed little after repeated melting/solidifying cycles. Thermogravimetric analysis suggested that CnS was thermally stable at temperatures up to 215°C. The volumetric latent heat storage capacities of CnS ranged from 146 to 159MJm−3. The latent heat storage/release performance of CnS in a ceramic cell suggested the potential application of the n-alkyl stearates for passive thermal energy storage to reduce the indoor temperature fluctuation.
Preparation and thermal properties of octyl, decyl, dodecyl and tetradecyl stearates as phase change materials for thermal energy storage
Yi, Qiuxia (author) / Tan, Shuai (author) / Jiang, Cui (author) / Guan, Xiaoqin (author) / Wu, Yong (author)
Energy and Buildings ; 152 ; 442-447
2017-07-25
6 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2007
Phase change materials and thermal energy storage for buildings
| Elsevier | 2015
Phase change materials and thermal energy storage for buildings
| Online Contents | 2015