エリスリトールと多価アルコールからなる2成分系混合相変化物質の融点/潜熱量の推算 [in Japanese] Estimation of Melting Point/Latent Heat of Binary Mixtures of Phase Change Material of Erythritol and Polyalcohol [in Japanese]
Access this Article
Search this Article
Author(s)
Abstract
Erythritol（融点119°C，潜熱量340 kJ/kg）に各種の多価アルコールを添加することにより，給湯温度域の有機系潜熱蓄熱材の新規開発を目指した．Erythritol–多価アルコールの2成分系混合PCMの融点および潜熱量はDSCを用いて測定した．多価アルコールとしては，Trimethylolethane, Trimethylolpropane, 2-Ethyl-2-methyl-1,3-propanediol, Pinacol, Dithioerythritol, Xylitol, Sorbitolを用いた．本実験によって得られた潜熱量および融点は，それぞれ2成分系混合物の融解に関する理想エンタルピー変化および固液系熱力学平衡から得られる推算値と比較した．<br>その結果，Erythritolに多価アルコールを加えた2成分有機系PCMの潜熱量は，おのおの両成分の重量分率に対する潜熱量の和によって2乗平均誤差13%以内の精度で推算可能であった．また融点については，溶液の活量係数も考慮した理想溶解度の式によって7%以内の誤差で推算可能であることが明らかになった．
To develop new organic PCMs for use in hot water supply, an attempt was made to adjust the melting temperature as well as the latent heat, by adding polyalcohol to erythritol, which has a melting temperature of 119°C and a latent heat of 340 kJ/kg.<br>The present study employed seven different polyalcohols: trimethylolethane, trimethylolpropane, 2-ethyl-2-methyl-1,3-propanediol, pinacol, dithioerythritol, xylitol and sorbitol. Thermophysical properties of latent heat and melting temperature of the binary mixtures of erythritol and polyalcohol were measured by means of a DSC. The data on the melting temperature and the latent heat were compared with those obtained by ideal enthalpy change in fusion of a binary mixture and thermodynamic equilibrium equation between a liquid and solid phase, respectively.<br>As a result, the latent heat of erythritol–polyalcohol mixtures could be estimated by the sum of latent heat of each component within a mean square error of 13%, in accordance with the weight ratio of erythritol and polyalcohol. Further, the melting temperature of a new organic PCM could be predicted within an error of 7% by an expression for the ideal solubility of a solid solute in a liquid solvent that takes into account the activity coefficient of the solution.
Journal
-
- KAGAKU KOGAKU RONBUNSHU
-
KAGAKU KOGAKU RONBUNSHU 32(5), 429-434, 2006-09-20
The Society of Chemical Engineers, Japan