提高近零能耗建筑热容量的PCM改性石膏麻混凝土

IF 1.4 Q4 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Environmental and Climate Technologies Pub Date : 2022-01-01 DOI:10.2478/rtuect-2022-0040
G. Bumanis, D. Bajare
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引用次数: 5

摘要

基于自然资源和可再生资源的低能耗建筑材料越来越受到客户的欢迎。原料的自然发生以及用其天然产物接近自然的想法使人们对大麻混凝土产生了浓厚的兴趣。大麻混凝土是一种除矿物粘结剂外,还以大麻碎骨料作为填料的粘结-骨料材料。这种复合材料的良好技术性能之前已经有过报道,而传统大麻混凝土的“先进材料”一词对土木工程师来说缺乏一些优越的性能。本研究提供了以石膏粘结剂和大麻片为主要成分的先进大麻型材料。此外,在混合物成分中加入相变材料(PCM)以增加其热质量。PCM为建筑提供了额外的热存储,使建筑围护结构在外部温度波动下的热稳定性更加均匀。这可以在供暖和制冷季节提供额外的舒适。将高达20wt .%的微胶囊化PCM悬浮液添加到大麻混凝土混合物中,并通过差示扫描量热法计算和验证热容。物理和机械性能也进行了评估。结果表明,在20 ~ 30℃温度区间内,混凝土的热容可提高到1901 J/(gK),提高幅度达70.4%,与理论热质量计算结果吻合较好。这为该材料的进一步开发提供了有希望的结果,并证明了PCM集成在麻混凝土中的可行性。
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PCM Modified Gypsum Hempcrete with Increased Heat Capacity for Nearly Zero Energy Buildings
Abstract Low energy building materials based on natural and renewable resources have become popular among customers. The natural occurrence of the raw materials and the idea to move closer to nature with its natural products have brought high interest in hempcrete. Hempcrete is a kind of binder-aggregate material where besides mineral binder, hemp shive aggregate act as a filler. A good technical performance of such composites has been reported before, while the term an ‘advanced material’ for traditional hempcrete lacks some superior properties for civil engineers. This research offers advanced hempcrete-type material where gypsum binder and hemp shives are used as the main components. Additionally, phase change material (PCM) was incorporated into the mixture composition to increase their thermal mass. PCM gives additional thermal heat storage for buildings which makes the building envelope more homogenous regarding thermal stability under outer temperature fluctuations. This could give additional comfort during heating and cooling seasons. Up to 20 wt.% of microencapsulated PCM suspension had been added to the hempcrete mixture composition and heat capacity was calculated and validated with differential scanning calorimetry measurements. Physical and mechanical performance was also evaluated. Results indicate that in the temperature interval from 20 to 30 °C, the heat capacity of hempcrete can be increased to 1901 J/(gK) (by 70.4 %) and it correlates well with theoretical thermal mass calculation. This gives promising results for further development of the material and proves the feasibility of PCM integration in hempcrete.
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来源期刊
Environmental and Climate Technologies
Environmental and Climate Technologies GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY-
CiteScore
3.10
自引率
28.60%
发文量
0
审稿时长
16 weeks
期刊介绍: Environmental and Climate Technologies provides a forum for information on innovation, research and development in the areas of environmental science, energy resources and processes, innovative technologies and energy efficiency. Authors are encouraged to submit manuscripts which cover the range from bioeconomy, sustainable technology development, life cycle analysis, eco-design, climate change mitigation, innovative solutions for pollution reduction to resilience, the energy efficiency of buildings, secure and sustainable energy supplies. The Journal ensures international publicity for original research and innovative work. A variety of themes are covered through a multi-disciplinary approach, one which integrates all aspects of environmental science: -Sustainability of technology development- Bioeconomy- Cleaner production, end of pipe production- Zero emission technologies- Eco-design- Life cycle analysis- Eco-efficiency- Environmental impact assessment- Environmental management systems- Resilience- Energy and carbon markets- Greenhouse gas emission reduction and climate technologies- Methodologies for the evaluation of sustainability- Renewable energy resources- Solar, wind, geothermal, hydro energy, biomass sources: algae, wood, straw, biogas, energetic plants and organic waste- Waste management- Quality of outdoor and indoor environment- Environmental monitoring and evaluation- Heat and power generation, including district heating and/or cooling- Energy efficiency.
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