Thermal optimization of a novel thermo-optically responsive SS-PCM coatings for building enclosures
Thermal optimization of a novel thermo-optically responsive SS-PCM coatings for building enclosures
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DOI：
10.1016/j.enbuild.2021.111129
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发表时间：
2021-05
影响因子：
6.7
通讯作者：
Zhiying Xiao;Pramod Kumar Mishra;A. M. Nejad;Mingjiang Tao;S. Granados-Fócil;S. Dessel
中科院分区：
文献类型：
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作者：
Zhiying Xiao;Pramod Kumar Mishra;A. M. Nejad;Mingjiang Tao;S. Granados-Fócil;S. Dessel
建筑能耗约占美国总能耗的40%。零能耗建筑（ZEB）在过去十年中受到了广泛关注，因为它们可以减轻建筑物对环境的一些负面影响。新的材料和系统正在出现，可以帮助以被动的方式调节建筑物外壳的热损失和增益，可能导致更具成本效益的ZEB。开发了一种新型的热光响应固-固相变材料（SS-PCM）涂层，以帮助抵消建筑物外壳中的热增益或热损失。该研究通过一系列数值模拟研究了SS-PCM的光学和热过程，以及封闭系统内不同层之间的协同作用。太阳入射角和相变温度对SS-PCM的吸收率的影响，有显着的光和热传递过程的影响，进行了探索。研究了在温暖和寒冷气候下使用SS-PCM系统在建筑围护结构中的可行性和效益。模拟结果：（1）确定SS-PCM涂层在所有方向上减少建筑物外壳的不良热交换的潜力，并确定屋顶为安装SS-PCM系统的优选位置;（2）证实系统全年的热效益，并确定SS-PCM的最佳相变温度，以最大限度地节省能源;和（3）与寒冷气候相比，SS-PCM涂层在温暖气候中表现出更多的热效益和节能，这对于大多数现有的被动式太阳能立面来说是一个挑战。
Building energy consumption constitutes approximately 40% of total energy usage in the US. zero energy buildings (ZEBs) have received much attention in the last decade as they can alleviate some of the negative impacts that buildings have on the environment. New materials and systems are emerging that can help regulate building enclosure heat losses and gains in a passive manner, possibly leading to more cost effective ZEBs. A novel thermo-optically responsive solid–solid phase change material (SS-PCM) coating has been developed to help offset heat gains or losses in building enclosures. The study investigates the optical and thermal processes of the SS-PCM, as well as the synergies among different layers within the enclosure system, through a series of numerical simulations. The impacts of the solar incoming angle and phase transition temperature on the absorptivity of the SS-PCM, which have a significant influence on the optical and thermal transfer processes, are explored. The feasibility and benefits of using the SS-PCM system in building enclosures under both warm and cold climates are investigated. Simulation results: (1) confirm the potential of the SS-PCM coatings to reduce undesirable heat exchange through building enclosure in all orientations and identify the roof as the preferred location of installing the SS-PCM system; (2) substantiate the thermal benefits of the system throughout the year and determine the optimal phase transition temperature of the SS-PCM with maximal energy saving; and (3) demonstrate more thermal benefits and energy saving of the SS-PCM coatings in warm climates compared to cold climates, which has been a challenge for most of existing passive solar facades.