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A platform for research: civil engineering, architecture and urbanism
Shape-stabilized phase change materials based on fatty acid eutectics/expanded graphite composites for thermal storage
Highlights Thermal conductivity improvement of low melting point organic PCMs is investigated for the first time. Expanded graphite (EG) is used to be a heat transfer and a shape-stabilized container. Thermal conductivity of the shape-stabilized PCMs is obviously enhanced. Latent heat of the shape-stabilized PCMs shows little change compared with original PCM. An optimal mass ratio of EG and organic PCMs is discussed.
Abstract Despite the well-known properties of organic phase change materials (PCMs), drawbacks including high phase transformation point, fluid leakage, and low thermal conductivity limit their practical applications. In this study, a kind of PCMs with low melting point (below 25°C) was prepared using capric and lauric acid as substrates with additive oleic acid (C-L-O acid). C-L-O acid was then impregnated into worm-like expanded graphite (EG) to form the shape-stabilized PCMs (SPCMs) without any chemical reaction. EG was used to be not only a heat transfer intensifier, but also a shape-stabilized container for C-L-O acid. The melting enthalpy (ΔH m) of the SPCMs (mass ratio of EG to C-L-O acid was 1:35) was calculated to be 114.65J/g, which was extremely close to the value of original C-L-O acid (115.91J/g). The thermal conductivity of the SPCMs (1:5) was measured to be 3.15W/mK, which was 22.5 times higher than that of original acid (0.14W/mK). The SPCMs also showed good thermal reliability after thermal treatment cycles measurements. With consideration of latent heat and thermal conductivity, the SPCMs (1:15) were eventually selected as the optimal SPCMs with their ΔH m of 109.18J/g and thermal conductivity of 1.95W/mK. These composite SPCMs can be easily mass prepared and further used as potential materials for practical radiant cooling system.
Shape-stabilized phase change materials based on fatty acid eutectics/expanded graphite composites for thermal storage
Highlights Thermal conductivity improvement of low melting point organic PCMs is investigated for the first time. Expanded graphite (EG) is used to be a heat transfer and a shape-stabilized container. Thermal conductivity of the shape-stabilized PCMs is obviously enhanced. Latent heat of the shape-stabilized PCMs shows little change compared with original PCM. An optimal mass ratio of EG and organic PCMs is discussed.
Abstract Despite the well-known properties of organic phase change materials (PCMs), drawbacks including high phase transformation point, fluid leakage, and low thermal conductivity limit their practical applications. In this study, a kind of PCMs with low melting point (below 25°C) was prepared using capric and lauric acid as substrates with additive oleic acid (C-L-O acid). C-L-O acid was then impregnated into worm-like expanded graphite (EG) to form the shape-stabilized PCMs (SPCMs) without any chemical reaction. EG was used to be not only a heat transfer intensifier, but also a shape-stabilized container for C-L-O acid. The melting enthalpy (ΔH m) of the SPCMs (mass ratio of EG to C-L-O acid was 1:35) was calculated to be 114.65J/g, which was extremely close to the value of original C-L-O acid (115.91J/g). The thermal conductivity of the SPCMs (1:5) was measured to be 3.15W/mK, which was 22.5 times higher than that of original acid (0.14W/mK). The SPCMs also showed good thermal reliability after thermal treatment cycles measurements. With consideration of latent heat and thermal conductivity, the SPCMs (1:15) were eventually selected as the optimal SPCMs with their ΔH m of 109.18J/g and thermal conductivity of 1.95W/mK. These composite SPCMs can be easily mass prepared and further used as potential materials for practical radiant cooling system.
Shape-stabilized phase change materials based on fatty acid eutectics/expanded graphite composites for thermal storage
Tang, Xuehui (author) / Zhu, Bei (author) / Xu, Minghan (author) / Zhang, Wei (author) / Yang, Zhi (author) / Zhang, Yafei (author) / Yin, Guilin (author) / He, Dannong (author) / Wei, Hao (author) / Zhai, Xiaoqiang (author)
Energy and Buildings ; 109 ; 353-360
2015-09-30
8 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2015
| British Library Online Contents | 2012