Derivation of appropriate temperature change for application of phase change materials in building walls for energy reduction in Korean climatic conditions

IF 3 3区 工程技术 Q2 CHEMISTRY, ANALYTICAL
Ki-Cheol Lee, Seonghyun Park, Chang-Young Park
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Abstract

Studies are underway to apply phase change materials (PCMs) to buildings to reduce energy consumption. PCMs can be expected to achieve energy savings by exploiting their high latent heat capacity and time-lag phenomenon, slowing down the heat transfer within the structure, and accumulating and releasing latent heat. This study analyzed the appropriate melting point and energy-saving effects based on changes in external climate conditions, attachment location, and PCM properties (thickness and thermal conductivity) through building energy simulations. Climate data were quantitatively categorized into climate zones based on heating degree hours, cooling degree hours, and insolation, and a total of 14 climate zones were proposed. The appropriate melting point based on climate was evidently more effective for cooling than for heating, and external attachment was proved to be more advantageous. As the thickness increased, the appropriate melting point decreased, and the energy-saving effect remained effective. The thermal conductivity increased with the graphite content by 0.90–2.37%, and the appropriate melting point also changed by 0.72–0.91 °C. As the thermal conductivity increased, heat was rapidly transferred within the PCM, altering its energy-saving effect by 0.18–3.35%.

Abstract Image

在韩国气候条件下,推导在建筑墙体中应用相变材料以降低能耗的适当温度变化
目前正在研究在建筑物中应用相变材料(PCMs)来降低能耗。PCM 可利用其较高的潜热容量和时滞现象,减缓结构内部的热量传递,并积累和释放潜热,从而有望实现节能。本研究通过建筑节能模拟,分析了基于外部气候条件、附着位置和 PCM 特性(厚度和导热系数)变化的适当熔点和节能效果。根据制热度小时、制冷度小时和日照,将气候数据定量划分为气候区,共提出了 14 个气候区。根据气候选择合适的熔点,显然制冷比制热更有效,而且外部附着被证明更有优势。随着厚度的增加,适宜熔点降低,节能效果依然有效。导热系数随石墨含量的增加而增加,增加了 0.90%-2.37%,适当熔点也变化了 0.72-0.91 ℃。随着导热系数的增加,热量在 PCM 内部迅速传递,其节能效果也随之改变了 0.18-3.35%。
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来源期刊
CiteScore
8.50
自引率
9.10%
发文量
577
审稿时长
3.8 months
期刊介绍: Journal of Thermal Analysis and Calorimetry is a fully peer reviewed journal publishing high quality papers covering all aspects of thermal analysis, calorimetry, and experimental thermodynamics. The journal publishes regular and special issues in twelve issues every year. The following types of papers are published: Original Research Papers, Short Communications, Reviews, Modern Instruments, Events and Book reviews. The subjects covered are: thermogravimetry, derivative thermogravimetry, differential thermal analysis, thermodilatometry, differential scanning calorimetry of all types, non-scanning calorimetry of all types, thermometry, evolved gas analysis, thermomechanical analysis, emanation thermal analysis, thermal conductivity, multiple techniques, and miscellaneous thermal methods (including the combination of the thermal method with various instrumental techniques), theory and instrumentation for thermal analysis and calorimetry.
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