Using Rammed Earth Materials for Building-Integrated Passive Air Conditioning

使用夯土材料实现建筑一体化被动空调

• 批准号: EP/E025684/1
• 负责人: Matthew Hall
• 金额: $ 24.46万
• 依托单位: University of Nottingham
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2007
• 资助国家: 英国
• 起止时间: 2007 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FE025684%2F1
• 关键词: Using; Rammed; Earth; Materials; Building

One of the most environmentally damaging trends in terms of the way we use energy in buildings is through the widespread use of air conditioning. It is claimed that stabilised rammed earth (SRE) walls can be used as a building-integrated form of 'passive' air conditioning. The walls are 'building integrated' because they form part of the building structure and are load-bearing. Critically, they offer the ability to passively cool a building by naturally absorbing heat. They can store this heat and re-radiate it when the ambient temperature falls such as at night time. This property of energy storage is referred to as the thermal flywheel effect and can greatly increase indoor comfort levels. The porous nature of the SRE material is coupled with the presence of clay minerals that also enable the walls to passively control the humidity of a building's internal environment, i.e. a humidity-based version of the thermal wheel.To date there has been no comprehensive research investigation aimed at quantifying the passive air conditioning properties of SRE materials. Although the passive effects of SRE materials have been exploited & monitored in buildings before, no study has been conducted to find how the material properties control this, how to further increase them, or how to optimise them. For example, knowing how to control material properties such that the passive cooling & dehumidification could be specified would enable these to be tailored to the design of a building. The potential future outcome could be buildings that air condition themselves so that only a relatively small intervention from mechanical building services is required.SRE walls can be constructed using a wide range of raw materials such as natural sub-soils, quarry waste products, and recycled crushed aggregate. There is a definite need to quantify the relevant physical properties of these raw materials as discussed above. An extensive range of SRE test specimens will be produced and used to examine how soil grading & composition affects a range of thermal properties and moisture vapour properties. The experimental work will try to optimise the grading of the soils then look to enhance the physical properties through the novel addition of various other materials. Once the capacity for a given SRE wall to passively control indoor temperature & humidity can be sensibly quantified, a reduction factor can be calculated to determine how much of the conventional air conditioning requirement could be supplied by the SRE. The extensive database passive thermal & moisture properties in SRE materials will be used in computer modelling software such as IES Apache and ESP-r for dynamic modelling of the building's performance. This modelling, along with the laboratory scale experimental testing, will be verified by the full-scale testing of a life-size SRE test building constructed at the University campus by industrial collaborators Earth Structures (Europe) Ltd.

就我们在建筑物中使用能源的方式而言，最具环境破坏性的趋势之一是空调的广泛使用。据称，稳定的夯实土（SRE）墙可以用作建筑物集成形式的“被动”空调。墙壁是“建筑一体化”，因为它们构成建筑结构的一部分，并且是承重的。重要的是，它们提供了通过自然吸收热量来被动冷却建筑物的能力。它们可以储存这些热量，并在环境温度福尔斯下降时（例如在夜间）将其重新辐射。这种能量储存的特性被称为热飞轮效应，可以大大提高室内舒适度。SRE材料的多孔性与粘土矿物的存在相结合，也使墙壁能够被动地控制建筑物内部环境的湿度，即基于湿度的热轮版本。迄今为止，还没有旨在量化SRE材料的被动空调性能的全面研究调查。尽管SRE材料的被动效应以前曾在建筑物中被利用和监测过，但还没有研究发现材料特性如何控制这一点，如何进一步增加它们，或如何优化它们。例如，知道如何控制材料属性，以便可以指定被动冷却和冷却，这将使这些能够根据建筑物的设计进行定制。未来的潜在成果可能是建筑物，空调自己，使只有一个相对较小的干预，从机械建筑服务是必需的。SRE墙可以使用广泛的原材料，如天然底土，采石场废物产品，和回收破碎骨料建造。如上所述，确实需要量化这些原材料的相关物理性质。将生产广泛的SRE试样，并用于检查土壤分级和成分如何影响一系列热性能和水蒸汽性能。实验工作将尝试优化土壤的分级，然后通过添加各种其他材料来提高物理性能。一旦给定的SRE墙被动控制室内温度和湿度的能力可以被合理地量化，就可以计算出减少因子以确定SRE可以提供多少传统的空调需求。SRE材料的被动热和湿度特性的广泛数据库将用于计算机建模软件，如IES Apache和ESP-r，用于建筑物性能的动态建模。这种建模，沿着实验室规模的实验测试，将通过工业合作者地球结构（欧洲）有限公司在大学校园建造的实物大小的SRE测试大楼的全尺寸测试进行验证。

项目成果

Evaporative drying in stabilised compressed earth materials using unsaturated flow theory

• DOI: 10.1016/j.buildenv.2009.07.003
• 发表时间: 2010-03-01
• 期刊: BUILDING AND ENVIRONMENT
• 影响因子: 7.4
• 作者: Hall, M. R.;Allinson, D.
• 通讯作者: Allinson, D.