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Assessment of a novel phase change material-based thermal caisson for geothermal heating and cooling
Energy Conversion and Management ( IF 10.4 ) Pub Date : 2021-02-27 , DOI: 10.1016/j.enconman.2021.113928
Masih Alavy , Michael Peiris , Julie Wang , Marc A. Rosen

Space heating and cooling account for major portions of the energy consumption in various types of buildings. Energy use that relies heavily on fossil fuels results in greenhouse gas emissions and ultimately contributes to climate change via global warming. As such, it is important to utilize clean and renewable technologies to meet building energy demands. One such technology is the ground-source heat pump (GSHP), which uses the free and abundant energy from the ground. However, GSHP systems are expensive to install and often suffer from declining efficiencies over time, especially when they are employed in buildings that have unbalanced heating and cooling loads, such as those in extreme Canadian climates. In this study, we introduce a novel concept, a thermal caisson (TC), which not only considerably reduces the capital costs of GSHP systems, but also mitigates their efficiency degradation over time. TCs serve a dual functionality as both structural components that support the building as well as energy system components that provide heating and cooling to buildings. The TC comprises ground heat exchanger loops and a carefully chosen phase change material (PCM), which stores and releases large quantities of latent heat when needed, connected to a high efficiency heat pump inside the building. Results show that TCs could reduce the capital costs of GSHP systems by up to 49% and increase their coefficients of performance by up to 16% (with a median change from 3.7 to 4.3 in January) resulting in much shorter payback periods as well as more stable and improved performance. Compared to fossil-fuel based systems, TCs offer a considerable reduction (close to 30% in this study) in annual operating costs for a much smaller corresponding increase in capital costs. The results suggest that TCs have promise to be widely incorporated in the heating, ventilation, and air-conditioning systems of numerous building types.



中文翻译:

评估用于地热加热和冷却的新型基于相变材料的热沉箱

空间供暖和制冷是各种类型建筑物中能耗的主要部分。严重依赖化石燃料的能源使用会导致温室气体排放,并最终通过全球变暖导致气候变化。因此,利用清洁和可再生技术来满足建筑能源需求非常重要。一种这样的技术是地源热泵(GSHP),它利用来自地面的自由和丰富的能量。但是,GSHP系统安装成本高昂,并且经常会随着时间的流逝而降低效率,特别是当它们用于供暖和制冷负荷不平衡的建筑物中时,例如在加拿大的极端气候中。在这项研究中,我们引入了一种新颖的概念,即热沉(TC),它不仅大大降低了GSHP系统的投资成本,而且还可以缓解其效率随时间的下降。TC具有双重功能,既可以为建筑物提供支持的结构组件,也可以为建筑物提供加热和冷却的能源系统组件。TC包括地面热交换器回路和精心选择的相变材料(PCM),相变材料可在需要时存储和释放大量潜热,并与建筑物内的高效热泵相连。结果表明,TC可以将GSHP系统的资本成本降低多达49%,并将其性能系数提高高达16%(1月份的中位数从3.7更改为4.3),从而导致投资回收期大大缩短,并且回收期更长。稳定和改进的性能。与基于化石燃料的系统相比,TC可以大大降低年度运营成本(在本研究中接近30%),而相应的资本成本却要小得多。结果表明,TC已有望广泛应用于众多建筑类型的采暖,通风和空调系统中。

更新日期:2021-02-28
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