探索相变材料在建筑围护结构中蓄热的潜力

Q4 Energy
Zachary Brozzesi, Darson Dezheng Li, Ann Lee
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引用次数: 0

摘要

建筑,由于其巨大的能源消耗,对未来构成了一个紧迫的问题。供暖、通风和空调(HVAC)系统不足进一步加剧了热管理困难和能源需求。为了应对这些挑战,相变材料(pcm)利用被动式制冷和供暖技术,为建筑领域的可持续节能提供了宝贵的潜力。数值研究探讨了在建筑围护结构中嵌入PCM对能源效率和热工性能的影响。结果表明,与没有PCM的情况相比,PCM集成显著降低了所有剖面的温度。通过被动吸收和储存相变过程中的热能,PCM减轻了通过对流和传导的热量传递,从而提高了能源效率,降低了冷却和加热目的的功耗。在前2小时内,PCM达到其平均熔化过程的50%,随后熔化速度逐渐降低。PCM完全熔化大约需要6个小时。随着PCM熔化过程的进行,系统的熵值增加,反映了无序度的增加。在建筑物顶端,熵值达到130 K/kg·K,是初始值的3倍以上。PCM在建筑围护结构中的集成显示出提高能源效率、热舒适性和耐久性的巨大潜力。未来的研究应侧重于优化PCM的放置和配置,以最大限度地提高其在不同建筑设计和气候条件下的效益。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Exploring the Potential of Phase Change Material for Thermal Energy Storage in Building Envelopes
Buildings, with their significant energy consumption, pose a pressing concern for the future. Inadequate heating, ventilation, and air-conditioning (HVAC) systems further exacerbate thermal management difficulties and energy requirements. To address these challenges, Phase Change Materials (PCMs) offer valuable potential for sustainable energy reduction within the building sector, leveraging passive cooling and heating techniques. Numerical study has been conducted to explore the impact of embedding PCM within the building envelope on energy efficiency and thermal performance. The results reveal that PCM integration significantly reduces temperatures across all sections compared to scenarios without PCM. By passively absorbing and storing heat energy during phase change, PCM mitigates heat transfer through convection and conduction, leading to improved energy efficiency and reduced power consumption for cooling and heating purposes. Within the first 2 hours, the PCM achieves 50% of its average melting process, followed by a gradual decrease in the melting rate. It takes approximately 6 hours for the PCM to completely melt. As the PCM undergoes the melting process, the system's entropy values increase, reflecting an increase in disorder. At the tip of the building, the entropy value reaches 130 K/kg·K, which is more than three times the initial value. The integration of PCM in building envelopes shows promising potential for enhancing energy efficiency, thermal comfort, and durability. Future research should focus on optimizing PCM placement and configuration to maximize its benefits in diverse building designs and climatic conditions.
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来源期刊
Journal of Nuclear Energy Science and Power Generation Technology
Journal of Nuclear Energy Science and Power Generation Technology Energy-Energy Engineering and Power Technology
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