A NEW PHASE-CHANGE MATERIAL EXPERIMENTAL METHOD AND THERMAL BEHAVIOR CALCULATION METHOD

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  • 潜熱蓄熱材の熱特性の測定法および熱的挙動の計算法に関する研究
  • 潜熱蓄熱材の熱特性の測定法および熱的挙動の計算法に関する研究 : パラフィンを対象とした見かけの比熱・熱伝導率の測定および非定常熱伝導計算による相変化挙動の再現(その1)
  • センネツチクネツザイ ノ ネツ トクセイ ノ ソクテイホウ オヨビ ネツテキ キョドウ ノ ケイサンホウ ニ カンスル ケンキュウ : パラフィン オ タイショウ ト シタ ミカケ ノ ヒネツ ・ ネツ デンドウリツ ノ ソクテイ オヨビ ヒテイジョウ ネツ デンドウ ケイサン ニ ヨル ソウヘンカ キョドウ ノ サイゲン(ソノ 1)
  • パラフィンを対象とした見かけの比熱・熱伝導率の測定および非定常熱伝導計算による相変化挙動の再現　その１
  • Part. 1 Paraffin simulation model for reproducing phase change behavior via specific heat and thermal conductivity measurements

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Phase Change Materials (PCM) affect the temperature stability inside houses. PCM is developed and utilized as a mean of passive solar strategy in houses. However, the literature found to lack established experimental methods of PCM installation in buildings. This article aimed to study and propose experimental and calculation methods for a PCM material.<br> Chapter 1 comprised previous studies and introduced the purpose of this research. In previous studies, it was seen that the Differential Scanning Calorimetry (DSC) is a typical method to determine the specific heat of PCM. However, the amount of PCM used DSC is limited, and it is possible that PCM indicates different heat characteristic when used in real houses, in comparison to the DSC. Therefore, the purpose of this research was to propose experimental methods for the PCM intended to be installed in houses, and to propose a calculation method for reproducing the experiment.<br> In Chapter 2, it was observed that the PCM is typically incorporated in the walls of the passive house, floors, and ceilings as a plane (2-dimentiaonl) material rather than small masses or bulk volumes.<br> In Chapter 3, for the PCM as a plane material, the Peltier device is suggested for measuring its specific heat and thermal conductivity. The conductivity of the liquid phase of a Paraffin without gelatinizer can be four times higher compared to the solid phase because of the heat convection in the liquid phase. In terms of the representative temperature for specific heat and enthalpy of the paraffin, the temperature between two PCM packs measured on equal distance from the external plane surfaces is more appropriate than the PCM-surface temperature.<br> The calculation method for reproducing the experiment is proposed in Chapter 4. In order to maintain the heat balanced, the PCM specific heat should be calculated from the temperature at the thermal node. When calculating the node-temperatures, the conductivity shall be considered alongside with the specific heat, because the paraffin's conductivity tends to vary significantly between the liquid phase and the solid phase.<br> There are a number of issues to be considered when applying this calculation to PCM types other than paraffin. These issues are presented in Chapter 5. In next studies, the derived calculation method will be extended to PCM with super-cooling or multiple specific heat peaks.

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