Performance of Ground Energy Systems Installed in Foundations

安装在地基中的地面能源系统的性能

基本信息

批准号：
EP/H049010/1
负责人：
William Powrie
金额：
$ 60.87万
依托单位：
University of Southampton
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2010
资助国家：
英国
起止时间：
2010 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FH049010%2F1
关键词：
Performance Ground Energy Systems Installed

项目摘要

The UK and the European Union have legally binding targets for reducing carbon dioxide emissions and for the increasing renewable energy generation. As about 25% to 33% of the UK's annual energy usage is expended on space heating, the provision of renewable heat energy is an area of critical importance if emissions and energy targets are to be achieved. Increased use of ground energy systems within foundations and other underground structures would be beneficial in both these respects, and will be eligible for financial support through the forthcoming government Renewable Heat Incentive. However, despite a recent increase in the use of ground energy systems, there remain key areas of uncertainty about their performance. This is especially important in the long term, where multiple installations will interact with each other and where unbalanced heating or cooling loads will lead to changes in the thermodynamic regime in the ground. This project aims to address some of the uncertainties surrounding ground energy systems installed in foundations by comprehensively instrumenting and monitoring two sites in contrasting ground conditions. This will allow the real response of the ground to known heating and cooling loads to be measured, and comparisons made with predictions based on analytical and numerical models. The use of contrasting geological regimes will allow investigation of the impact of groundwater on the performance of systems, something rarely considered and not well understood. The field monitoring will be accompanied by a programme of in situ and laboratory testing to assess differences in thermal behaviour at different scales and temperatures relevant to ground energy systems. The testing programme will address questions relating to degrees of uncertainty in determining key thermal properties and how this may compare with other uncertainties in the system design, such as heating/cooling loads. Numerical modelling, including back analysis of the in situ thermal response testing and operation of the ground energy systems, will allow assessment of the sensitivity of the systems to different input parameters. The modelling will also allow evaluation of the numerical and analytical techniques currently used for the design of ground energy systems and assessment of the importance of key factors (geological variation, groundwater, surface boundary conditions, geothermal gradient) not currently accounted for in existing methods. Taken together, the various strands to the project are expected to provide an important dataset which will add substantially to the understanding of the performance of ground energy systems. By addressing uncertainties surrounding design input parameters, geological conditions and design approaches, the project will also provide relevant lessons for direct application to the design and construction of ground energy systems installed in foundations, which it is expected will ultimately form part of improved guidance for industry.

英国和欧盟具有减少二氧化碳排放和可再生能源发电的法律具有约束力的目标。由于大约25％至33％的年度能源使用是在太空供暖方面花费的，因此如果要实现排放和能源目标，则提供可再生热能是至关重要的。在这两个方面，基础和其他地下结构内的地面能源系统的使用将是有益的，并且通过即将到来的政府可再生热量激励有资格获得财政支持。但是，尽管最近使用地面能源系统的使用，但其性能仍然存在不确定性的关键领域。从长远来看，这一点尤其重要，在这种情况下，多个安装将相互相互作用，而不平衡的加热或冷却负荷会导致地面热力学状态的变化。该项目旨在通过在相比地面条件下全面仪器和监视两个地点，以解决基础中安装的地面能源系统的一些不确定性。这将允许测量地面对已知的加热和冷却载荷的真实响应，并根据分析和数值模型进行预测进行比较。使用对比的地质制度将允许调查地下水对系统性能的影响，这很少被认为并且不太了解。现场监测将伴随一项原位和实验室测试程序，以评估与地面能源系统相关的不同尺度和温度下热行为的差异。测试程序将解决与确定关键热能性能的不确定性程度有关的问题，以及与系统设计中的其他不确定性（例如加热/冷却负载）相比。数值建模，包括对原位热响应测试和地面能量系统操作的背部分析，将允许评估系统对不同输入参数的敏感性。该建模还将允许评估目前用于地面能源系统设计的数值和分析技术，并评估关键因素的重要性（地质变化，地下水，表面边界条件，地热梯度），目前尚未考虑现有方法。综上所述，该项目的各种链条有望提供一个重要的数据集，这将大大增加对地面能源系统性能的理解。通过解决围绕设计输入参数，地质条件和设计方法的不确定性，该项目还将提供相关的课程，以直接应用基金会中安装的地面能源系统的设计和构建，预计最终将构成改进的行业指导的一部分。