EPSRC-FAPESP Efficient ground energy systems for deployment in diaphragm walls under challenging application scenarios

EPSRC-FAPESP 高效的地面能源系统，可在具有挑战性的应用场景下部署在地下连续墙中

• 批准号: EP/X032639/1
• 负责人: Fleur Loveridge
• 金额: $ 112.62万
• 依托单位: University of Leeds
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FX032639%2F1
• 关键词: EPSRC; FAPESP; Efficient; ground; energy

This project has been developed under the EPSRC lead agency agreement scheme with FAPESP, Brazil, that allows joint international working. The project is therefore to be delivered by an integrated team in the UK and Brazil ; working across the fields of geotechnical engineering, thermal analysis and building services engineering bringing together a team of Geotechnical and Mechanical Engineers.The project tackles heating and cooling of buildings, which is a key priority for meeting NetZero targets. Almost half of global energy use is related to heating (one quarter of UK emissions). Cooling is a minor, but growing emissions source in the UK, but globally energy consumption for cooling has more than tripled since 1990, and will continue to increase with climate change. In Brazil, cooling public and private buildings is responsible for half of national electricity demand (predicted 40% increase by 2035). Thermal energy solutions that can deliver against these cooling and heating demands urgently need to be developed. In the UK, heat pump deployment is not progressing as fast as is required, while in Brazil, there is an absence of demonstrator projects showing local feasibility. Heat pumps are suited to both heating and cooling, with ground source heat pumps (GSHPs) offering high efficiencies. However, innovation is required to reduce capital costs.Inclusion of heat transfer pipes within sub-structures, so called energy geostructures, is one way to reduce costs of GSHP systems. This project aims to tackle the problem of developing embedded retaining walls for application in thermal energy. Embedded retaining walls, e.g. constructed to support underground car-parks, are themselves costly structures that can have very long lifetimes. Currently their use is restricted to retaining the ground, but they could be built to have dual purpose by incorporating them in a GSHP system. This would seem like an obvious thing to do but it adds additional complexity in design and construction. The benefits and potential for optimisation, especially in difficult ground conditions, are unproven. Thus, research is required to convince industry and developers to adopt these systems. This project will equip them with the appropriate design tools and knowledge to incorporate highly efficient and optimised energy retaining walls into GSHP systems.We will construct a controlled field study site at the University of Sau Paulo (USP) in Brazil that will include an instrumented retaining wall system with different pipework geometries to allow a wide variety of wall operation modes to be studied. This will create an important data set specific to the local South American climate and ground conditions. Initial design of the system will be aided by numerical simulation (University of Leeds) which will also serve as a benchmark to judge subsequent simulation and analytical model development. Scaled physical models of the USP test site and wall arrangements will be fabricated at the University of Dundee and tested on a geotechnical centrifuge. These physical models will be validated against the field data collected. Centrifuge testing will be used to vary different parameters that cannot be easily controlled on site and test deeper walls and ground conditions similar to brownfield land development in the UK. The University of Leeds will then use the data and insights from the field and physical model studies to develop thermal analytical tools for design of these structures. This will result in fast run transient solutions for energy walls that can work in a variety of ground conditions and be integrated with existing building energy modelling software. Development of these tools will then be available for practical design of more efficient embedded retaining wall GSHP systems and remove barriers to adoption.

该项目是根据与巴西FAPESP的EPSRC Lead Agency协议计划开发的，该协议允许联合国际工作。因此，该项目将由英国和巴西的综合团队实施；跨越岩土工程，热分析和建筑服务工程的领域，将岩土工程和机械工程师组成的团队汇总在一起。该项目可以解决建筑物的供暖和冷却，这是实现Netzero目标的关键优先事项。全球能源使用的几乎一半与供暖有关（英国排放量的四分之一）。冷却是次要的，但在英国的排放来源不断增长，但是自1990年以来，全球冷却能源消耗的增加了两倍以上，随着气候变化的速度将继续增加。在巴西，冷却公共建筑和私人建筑物是国家电力需求的一半（预计到2035年增加了40％）。需要迫切需要开发针对这些冷却和加热需求的热能解决方案。在英国，热泵部署的进展并不如要求的那样快，而在巴西，没有示威者项目显示当地的可行性。热泵既适合加热和冷却，又有地面源热泵（GSHP）可提供高效率。但是，需要创新来降低资本成本。包括子结构中的传热管道（所谓的能源地理结构）是降低GSHP系统成本的一种方法。该项目旨在解决开发嵌入式固定壁以应用热能的问题。嵌入的固定壁，例如构建以支持地下汽车公园，本身就是昂贵的结构，可能会有很长的一生。目前，它们的使用仅限于保留地面，但可以通过将它们纳入GSHP系统来建立双重目的。这似乎是一件明显的事情，但它在设计和构造方面增加了更多的复杂性。未经证实的优化的好处和潜力，尤其是在困难的地面条件下。因此，需要研究以说服行业和开发人员采用这些系统。该项目将为他们提供适当的设计工具和知识，以将高效和优化的能源固定墙纳入GSHP系统中。我们将在巴西的Sau Paulo大学（USP）建造一个受控的现场研究地点，其中将包括具有不同管道的仪表式墙壁系统，该系统具有不同的管道式墙壁系统，以允许各种各样的壁操作模式进行研究。这将创建一个针对南美当地气候和地面条件的重要数据集。该系统的初始设计将通过数值模拟（利兹大学）的帮助，这也将作为判断随后的模拟和分析模型开发的基准。 USP测试站点和墙壁布置的规模物理模型将在邓迪大学制造，并在岩土离心机上进行测试。这些物理模型将根据收集的现场数据进行验证。离心机测试将用于改变不同的参数，这些参数无法轻易在现场控制并测试更深的墙壁和地面条件，类似于英国布朗菲尔德的土地开发。然后，利兹大学将使用现场和物理模型研究的数据和见解来开发用于设计这些结构的热分析工具。这将导致可以在各种地面条件下运行的能壁的快速瞬态解决方案，并与现有的建筑能源建模软件集成。然后，这些工具的开发将用于实践设计，以实用更有效的嵌入式固定壁GSHP系统并消除采用障碍。

项目成果

Conduction Shape Factors for Thermally Active Retaining Walls

热活性挡土墙的传导形状系数

• DOI: 10.59490/seg.2023.535
• 发表时间: 2023
• 期刊: Symposium on Energy Geotechnics 2023
• 作者: Gupta A