Abstract
The accuracy of differential scanning calorimetry (DSC) used in the dynamic method, which is the method most widely used to measure the thermal performance of existing phase-change materials (PCMs), is limited when measuring the phase-change range and peak temperature of PCMs combined with building materials. Therefore, we measured the thermal performance in a thermochamber; the samples were a sheet of shape-stabilized phase-change material (SSPCM) and a microencapsulated PCM-impregnated gypsum board fabricated by combining PCM building materials with paraffin. Then, we investigated ways to improve the measurement accuracy. We confirmed the setting time of the thermochamber temperature change based on the internal temperature of the PCM and the effect of the PCM capacity on its thermal performance using the dynamic method. The temperature was increased or decreased in uniform steps at regular time intervals. The error of the heat absorption and release was less than 2% when a stabilization time of at least 4 h elapsed before the start of the heating or cooling process. Overall trends in the specific heat and enthalpy, such as the phase-change section and peak temperature of the PCM, were similar regardless of the setting time. Thus, it was confirmed that the latent heat performance did not increase proportionally with the increase in the PCM capacity. The proposed approach can be used to measure the specific heat and enthalpy of various types of PCMs and building materials.
Highlights
The use of thermal energy storage (TES) systems in the building and industrial sectors has great potential for energy conservation [1]
The specific heat and enthalpy of an shape-stabilized phase-change material (SSPCM) and a microencapsulated phase-change materials (PCMs)-impregnated gypsum board fabricated by combining a PCM building material with paraffin were measured under various conditions using the dynamic method
The setting time of the dynamic method did not significantly affect the measurement of the latent heat of the PCM samples when a sufficient stabilization time elapsed before the heating and cooling processes in the thermochamber
Summary
The use of thermal energy storage (TES) systems in the building and industrial sectors has great potential for energy conservation [1]. Lai et al [21] measured the specific heat of gypsum boards incorporating a microencapsulated PCM with a melting point of 28 ◦ C in a thermobath at different temperatures and investigated its heat transfer and heat storage behavior These studies are considered to be insufficient for demonstrating the variation in the experimental results with changes in the temperature of the thermochamber or thermobath, changes in the stabilization setting time, and the method of using the internal temperature of the PCM sample to measure specific heat. We investigated the use of a thermal chamber without DSC equipment to improve the measurement accuracy of the thermal performance of PCM building materials For this purpose, the specific heat and enthalpy of an SSPCM sheet and microencapsulated. We could improve the accuracy of the thermal performance measurement of PCM building materials and identify an effective measurement method
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