Study on Measurement of Latent Heat of Aqueous Solutions Using DSC

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  • ASAOKA Tatsunori
    Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology
  • KUMANO Hiroyuki
    Department of Mechanical Systems Engineering, Shinshu University
  • SAITO Akio
    Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology
  • OKAWA Seiji
    Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology

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  • DSC を用いた水溶液の潜熱測定に関する研究
  • DSC オ モチイタ スイヨウエキ ノ センネツ ソクテイ ニ カンスル ケンキュウ

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In evaluating results of calorimetrical analysis of aqueous solutions using DSC, it is generally inadequate to use the usual method for pure materials, since the temperature of the solutions varies in wide range through the phase change process. In this study, the original method, in which the specific enthalpy of aqueous solution is expressed as a function of temperature and initial concentration, is proposed. Additionally, the formulation only using the properties of the solution was proposed and the functions of specific enthalpy were derived from the formulation. The functions were compared with the result obtained from DSC, using ethanol, ethylene glycol and Propylene glycol solutions as samples. Since these values agree well with each other, it is found that the function of specific enthalpy can also be obtained from the formulation. Finally, the advantages of this evaluating method for practical use were discussed.

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