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首页> 外文期刊>Journal of Energy Engineering >Understanding the Energy Implications of Phase-Change Materials in Concrete Walls through Finite-Element Analysis
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Understanding the Energy Implications of Phase-Change Materials in Concrete Walls through Finite-Element Analysis

机译：通过有限元分析了解相变材料在混凝土墙中的能量影响

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Dwindling energy resources and associated environmental costs have resulted in a serious need to design and construct energy-efficient buildings. One of the strategies to develop energy efficient structural materials is the incorporation of phase-change materials (PCM) in the structural element. This paper presents details of a finite-element-based framework that is used to study the thermal performance of structural precast concrete wall elements with and without a layer of phase-change material. The simulation platform developed can be implemented for a wide variety of input parameters. In this study, two different locations in the continental United States, representing different ambient temperature conditions, two different types of concrete-normal weight and lightweight-two PCM types, and different PCM layer thicknesses are considered with an aim of understanding the energy flow across the wall member. The energy flow through the inside face of the wall, which determines the indoor HVAC energy consumption, is used as the defining parameter. Phase-change materials incorporating lightweight concrete wall design reduces HVAC costs in hot climates compared with the use of normal concrete. An ad hoc optimization scheme is also implemented where the PCM thickness is fixed but its location and properties are varied. Numerical results show (1) a slightly better response for PCM placed closer to the inside face of the wall compared with other locations, especially for hotter climates, and (2) energy savings are possible with small changes in baseline values, information that a PCM manufacturer can possibly use to design the next generation of phase-change materials.
机译：能源资源的减少和相关的环境成本导致设计和建造节能建筑的迫切需求。开发节能结构材料的策略之一是在结构元素中引入相变材料（PCM）。本文介绍了基于有限元的框架的详细信息，该框架用于研究带有和不带有相变材料层的结构混凝土预制墙构件的热性能。开发的仿真平台可用于多种输入参数。在这项研究中，考虑到美国大陆上的两个不同位置，分别代表不同的环境温度条件，两种不同类型的混凝土（普通重量）和轻质（两种PCM类型）以及不同的PCM层厚度，目的是了解跨墙成员。决定室内HVAC能耗的通过墙壁内表面的能量流将用作定义参数。相较于普通混凝土，相结合材料结合了轻质混凝土墙设计，可降低炎热气候下的HVAC成本。在PCM厚度固定但位置和属性变化的情况下，还可以采用一种临时优化方案。数值结果表明：（1）与其他位置相比，PCM靠近墙的内表面的响应要好一些，尤其是在较热的气候下；（2）基线值的微小变化可以节省能源，这是PCM的信息。制造商可能会使用它来设计下一代相变材料。

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