用于热能储存的脂肪酸/扩展石墨复合物相变材料的创新水泥砂的制备和表征
Dongyi Zhou1, Shuaizhe Xiao2, Yicai Liu3
1School of Energy and Mechanical Engineering, Hunan University of Humanities, Science and Technology, Loudi, 417000, China. zhoudongyi2005@163.com.
Scientific reports
|July 17, 2024
概括
这项研究开发了一种新型的复合热能储存水泥砂 (CTESCM),用于建筑节能. 该材料有效地储存热能,对诸如地板加热系统等应用具有前景.
科学领域:
- 材料科学 材料科学 材料科学
- 建筑科学 建筑科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 建筑节能对可持续性至关重要.
- 换相材料 (PCM) 为建筑物中的热能储存提供了潜力.
- 为建筑材料开发有效和兼容的PCM是一个正在进行的研究领域.
研究的目的:
- 开发和描述一种新型的复合热能储存水泥砂 (CTESCM).
- 评估CTESCM用于建筑应用的热性能和物理性能.
- 评估CTESCM在建筑物节能方面的可行性.
主要方法:
- 用不同质量分数的酸-棕酸/扩张石墨 (LA-PA/EG) 复合相变材料 (CPCM) 制造CTESCM.
- 使用差分扫描热量计 (DSC),热重力测量分析 (TGA),导热率和热储/释放试验进行热特性测定.
- 通过扫描电子显微镜 (SEM) 评估物理性质 (密度,压力强度) 和微结构分析.
主要成果:
- 在CTESCM中,相位过渡温度低于基CPCM.
- 隐性热量随着CPCM质量含量减少而减少.
- 加入CPCM导致砂的导热率,密度和压力强度下降.
- 使用20%CPCM的CTESCM显示了建筑节能潜力.
结论:
- 开发的CTESCM是建筑节能可行的材料.
- 该材料的热能存储能力使其适用于诸如地板辐射加热系统等应用.
- 进一步优化可以提高机械性能,同时保持热性能.
更多相关视频
相关概念视频
01:21Masonry in Cold and Hot Weather Conditions
83
In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units...
Other key practices include keeping masonry units...
83
01:29Strength and Heat of Hydration
226
The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
226
01:29Frost Resistant Concrete
75
Concrete's susceptibility to frost damage during freeze-thaw cycles demands strategic measures to enhance its frost resistance. Employing techniques like air entrainment, adjusting the water-cement ratio, proper curing, and selecting appropriate aggregates are essential.
Introducing microscopic air bubbles into the concrete mix through air entrainment creates small voids that accommodate ice expansion, thereby reducing internal pressures and preventing cracking. The optimal amount of...
Introducing microscopic air bubbles into the concrete mix through air entrainment creates small voids that accommodate ice expansion, thereby reducing internal pressures and preventing cracking. The optimal amount of...
75
01:24Hydration of Cement
217
Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
217
01:17Mortar Properties
118
Mortar properties encompass a range of characteristics crucial for construction and masonry work, including workability, water retention, bond strength, durability, compressive strength, volume change, and appearance. Workability refers to mortar's ability to be easily applied and manipulated without sagging or falling off surfaces, which is important for efficient masonry unit placement and alignment. Water retention is essential to prevent the mortar from losing moisture too quickly to...
118
01:29Mortar
209
Mortar, a mixture of Portland cement, hydrated lime, sand, and water, is a crucial binding material in construction. Its primary function is to join masonry units together, filling gaps and ensuring a uniform distribution of weight across the structure. This helps in preventing potential weaknesses. Mortar also serves as a protective barrier against environmental elements such as water and wind, thereby safeguarding the interior of the structure. It also compensates for surface irregularities...
209