This work focused on characterizing and improving the thermal behavior of metal sheet roofing.To decrease the heat transfer from the roof into a building,we investigated the efficiency of four types of phase change ma...This work focused on characterizing and improving the thermal behavior of metal sheet roofing.To decrease the heat transfer from the roof into a building,we investigated the efficiency of four types of phase change materials,with different melting points:PCMІ,PCM II,PCM III and PCM IV,when used in conjunction with a sheet metal roof.The exterior metal roofing surface temperature was held constant at 50℃,60℃,70℃and 80℃,using a thermal source(halogen lights)for 360 min to investigate and compare the thermal performance of the metal sheet roofing with and without phase change materials for each condition.The thermal behaviors of the phase change materials were analyzed by differential scanning calorimeter(DSC).The results showed the melting points of PCMІ,PCM II,PCM III and PCM IV were around 45℃,50℃,55℃and 59℃,respectively.The integration of PCM IV into the metal roofing sheet increased the thermal performance by reducing the room temperature up to 2.8%,1.4%,1.0%and 0.7%when compared with the normal metal roof sheet,at the controlled temperatures of 50℃,60℃,70℃and 80℃,respectively.The thermal absorption of the phase change materials also caused a time delay in the model room reaching a steady temperature.The integration of phase change materials with metal roofing sheets resulted in better thermal performance and conservation of electrical energy by reducing the demand for cooling.展开更多
The energy consumption in buildings for heating,ventilation,and air-conditioning is increasing with the in-creasing demand for thermal comfort.Thermal energy storage with phase change material(PCM)has attracted growin...The energy consumption in buildings for heating,ventilation,and air-conditioning is increasing with the in-creasing demand for thermal comfort.Thermal energy storage with phase change material(PCM)has attracted growing attention for its role in achieving energy conservation in buildings with thermal comfort.This paper investigates the effect of PCM on the heat transfer rate in a building wall and the role of PCM on the indoor thermal comfort of the building.Two models of building wall fragments were developed for the experimental study.In one model,tests were conducted for different positions of the PCM layer in the building wall to identify the optimal position of the PCM layer inside the wall.In another model,tests were carried out integrating PCM,air gap,and other conventional building materials(brickbat and sand),one at a time,to investigate the role of PCM on the heat transfer rate in the building wall fragment.The results show that placing the PCM layer closer to the heat source gives a low-temperature gain of the cold water bath(indoor state)as compared with the PCM layer near the heat sink.With PCM,the temperature rise of the cold water bath(indoor state)of the building wall fragment was the lowest,and the slope of the temperature rise of the cold water bath becomes steadier with time i.e.,fewer temperature fluctuations.There was a significant time delay for the cold water bath to reach a given temperature.The heat required for a unit degree increase in the temperature of the cold water bath was higher and the peak heat flux of the wall was lower relative to the other building materials.展开更多
为了系统地分析相变材料应用于建筑节能领域的发展态势,以中国知网期刊和Web of Science核心合集引文数据库收录的2001-2021年“相变材料”及“建筑节能”为主题的文献为数据源,利用信息可视化软件Cite Space分析了相变材料应用于建筑...为了系统地分析相变材料应用于建筑节能领域的发展态势,以中国知网期刊和Web of Science核心合集引文数据库收录的2001-2021年“相变材料”及“建筑节能”为主题的文献为数据源,利用信息可视化软件Cite Space分析了相变材料应用于建筑节能的研究现状、研究热点、研究主题和发展趋势,总结并绘制了该领域知识路线图。相变材料应用建筑节能领域可总结为4个主要方面:相变材料传热性能的研究、提高相变材料热导率技术、相变材料应用技术。未来研究重点将是通过添加高导热率材料来提升和改善相变材料的传热性能及其他性能。综合分析表明,近年来相变材料在建筑节能中的应用研究呈现逐年上升趋势,研究热点主要集中于制备及方法研究、储热装置的性能研究和应用研究,其未来研究方向将更加注重降低建筑能耗,以及相变建筑构件的耐久性和稳定性。展开更多
Phase change materials(PCMs)are increasingly capturing the spotlight in the realm of building design and construction owing to their capacity to absorb and release thermal energy throughout phase transitions.This revi...Phase change materials(PCMs)are increasingly capturing the spotlight in the realm of building design and construction owing to their capacity to absorb and release thermal energy throughout phase transitions.This review provides a comprehensive overview of PCMs,outlining their properties and applications in improving energy efficiency,comfort,and sustainability in buildings.It delves into various types of PCMs,discussing their selection criteria,integration methods,and their impact on indoor climate and energy consumption.The exploration covers both passive and active PCM systems across diverse building components,including implications for walls,roofs,windows,and floors,and integrated heating,ventilation and air conditioning(HVAC)and solar energy storage.Additionally,the review addresses challenges associated with PCM implementation in building applications while considering future prospects in this field.展开更多
基金The authors would like to thank the Thailand Science Research and Innovation(TSRI),Faculty of Science,Naresuan University for providing financial support to this research work,and our research center.
文摘This work focused on characterizing and improving the thermal behavior of metal sheet roofing.To decrease the heat transfer from the roof into a building,we investigated the efficiency of four types of phase change materials,with different melting points:PCMІ,PCM II,PCM III and PCM IV,when used in conjunction with a sheet metal roof.The exterior metal roofing surface temperature was held constant at 50℃,60℃,70℃and 80℃,using a thermal source(halogen lights)for 360 min to investigate and compare the thermal performance of the metal sheet roofing with and without phase change materials for each condition.The thermal behaviors of the phase change materials were analyzed by differential scanning calorimeter(DSC).The results showed the melting points of PCMІ,PCM II,PCM III and PCM IV were around 45℃,50℃,55℃and 59℃,respectively.The integration of PCM IV into the metal roofing sheet increased the thermal performance by reducing the room temperature up to 2.8%,1.4%,1.0%and 0.7%when compared with the normal metal roof sheet,at the controlled temperatures of 50℃,60℃,70℃and 80℃,respectively.The thermal absorption of the phase change materials also caused a time delay in the model room reaching a steady temperature.The integration of phase change materials with metal roofing sheets resulted in better thermal performance and conservation of electrical energy by reducing the demand for cooling.
文摘The energy consumption in buildings for heating,ventilation,and air-conditioning is increasing with the in-creasing demand for thermal comfort.Thermal energy storage with phase change material(PCM)has attracted growing attention for its role in achieving energy conservation in buildings with thermal comfort.This paper investigates the effect of PCM on the heat transfer rate in a building wall and the role of PCM on the indoor thermal comfort of the building.Two models of building wall fragments were developed for the experimental study.In one model,tests were conducted for different positions of the PCM layer in the building wall to identify the optimal position of the PCM layer inside the wall.In another model,tests were carried out integrating PCM,air gap,and other conventional building materials(brickbat and sand),one at a time,to investigate the role of PCM on the heat transfer rate in the building wall fragment.The results show that placing the PCM layer closer to the heat source gives a low-temperature gain of the cold water bath(indoor state)as compared with the PCM layer near the heat sink.With PCM,the temperature rise of the cold water bath(indoor state)of the building wall fragment was the lowest,and the slope of the temperature rise of the cold water bath becomes steadier with time i.e.,fewer temperature fluctuations.There was a significant time delay for the cold water bath to reach a given temperature.The heat required for a unit degree increase in the temperature of the cold water bath was higher and the peak heat flux of the wall was lower relative to the other building materials.
文摘为了系统地分析相变材料应用于建筑节能领域的发展态势,以中国知网期刊和Web of Science核心合集引文数据库收录的2001-2021年“相变材料”及“建筑节能”为主题的文献为数据源,利用信息可视化软件Cite Space分析了相变材料应用于建筑节能的研究现状、研究热点、研究主题和发展趋势,总结并绘制了该领域知识路线图。相变材料应用建筑节能领域可总结为4个主要方面:相变材料传热性能的研究、提高相变材料热导率技术、相变材料应用技术。未来研究重点将是通过添加高导热率材料来提升和改善相变材料的传热性能及其他性能。综合分析表明,近年来相变材料在建筑节能中的应用研究呈现逐年上升趋势,研究热点主要集中于制备及方法研究、储热装置的性能研究和应用研究,其未来研究方向将更加注重降低建筑能耗,以及相变建筑构件的耐久性和稳定性。
文摘Phase change materials(PCMs)are increasingly capturing the spotlight in the realm of building design and construction owing to their capacity to absorb and release thermal energy throughout phase transitions.This review provides a comprehensive overview of PCMs,outlining their properties and applications in improving energy efficiency,comfort,and sustainability in buildings.It delves into various types of PCMs,discussing their selection criteria,integration methods,and their impact on indoor climate and energy consumption.The exploration covers both passive and active PCM systems across diverse building components,including implications for walls,roofs,windows,and floors,and integrated heating,ventilation and air conditioning(HVAC)and solar energy storage.Additionally,the review addresses challenges associated with PCM implementation in building applications while considering future prospects in this field.
