Engineered Thermal Transition Zones for Enhanced Geotechnical Foundation Systems

用于增强岩土基础系统的工程热过渡区

• 批准号: 1634493
• 负责人: David Frost
• 金额: $ 26.12万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-06-01 至 2018-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1634493&HistoricalAwards=false
• 关键词: Engineered; Thermal; Transition; Zones; Enhanced

Working with an industry partner, this research will develop a new design configuration and installation methodology for heat exchange thermal piles which deviates from the current approach of internally modifying conventional structural piles. This will be achieved by replacing the conventional system with a transition zone that is manufactured in-place between a conventional structural pile and the surrounding soil to significantly increase thermal performance of the pile system. Proof-of-concept modeling has shown the potential for dramatic increases in the thermal performance of an energy pile that can make them a more feasible renewable and sustainable energy alternative for heating and cooling buildings, including single and multi-family residential buildings. The study will use the new insight from the proof-of-concept modeling as the motivation for laboratory and field scale physical and numerical testing. The broader impacts of being able to dramatically alter the performance and efficiency of thermal pile systems has significant implications on global heating and cooling needs in both developed and developing countries, and can contribute to reducing greenhouse gas emissions. This research is very much aligned with the concept and philosophy of sustainable infrastructure, and encourages a systematic approach to evaluating alternative approaches across the key dimensions most likely to influence system performance including environmental, societal and economic impact, as well as technical factors. Projects based on this research will be developed for the Georgia Tech class "Sustainable Subsurface Infrastructure."In order to better understand the various factors influencing thermal performance of energy piles and to optimize heat transfer characteristics, a series of tasks will build on the insights derived during the proof-of-concept studies. The focus of this investigation is to not only to study the problem in a controlled lab environment, but also to develop practical methodologies for utilization of the results in designing and installing thermally optimized energy piles. To achieve this, the project will first design, fabricate and utilize a laboratory scale apparatus to test model engineered transition zone piles with different soil conditions and different boundary conditions. The tests will be used to validate additional numerical simulations that extend the findings of the original proof-of-concept numerical model studies to design prototype full scale field systems. Working with an industry partner, a full-scale field system will be installed and monitored during a series of trials to assess both the initial response as well as the longer term performance of the system as heating and cooling cycles are applied to the system. The installation method to be used in the field involves the strategic repurposing of existing equipment to allow a staged installation procedure of the new thermal pile configuration. This has important implications for the adoption of the method in practice. Upon completion of the full scale field testing, a design methodology that can be used for future installations in a variety of subsurface conditions with engineered thermal transition zones of different dimensions will be developed.

与行业合作伙伴合作，这项研究将开发一种新的设计配置和安装方法，用于热交换热桩，这偏离了当前内部修改常规结构桩的方法。 这将通过用传统的结构桩和周围土壤之间的过渡区代替常规系统来实现这一目标，从而显着提高桩系统的热性能。 概念验证的建模表明，能量桩的热性能急剧增加的潜力，这可以使它们成为加热和冷却建筑物（包括单户住宅建筑物）的更可行的可再生能源和可持续能源替代方案。 该研究将使用概念验证模型中的新见解作为实验室和现场尺度物理和数值测试的动机。 能够极大地改变热桩系统的性能和效率的更广泛的影响对发达国家和发展中国家的全球供暖和冷却需求产生了重大影响，并且可以促进温室气体排放。 这项研究与可持续基础设施的概念和哲学非常一致，并鼓励采用系统的方法来评估最有可能影响系统绩效（包括环境，社会和经济影响）的关键维度的替代方法，以及技术因素。将为佐治亚理工学院类“可持续地下基础架构”开发基于这项研究的项目。为了更好地了解影响能量堆的热性能并优化传热特征的各种因素，一系列任务将基于验证验证研究期间得出的见解。 这项调查的重点是不仅要在受控的实验室环境中研究该问题，还要是开发实用方法来利用结果，以设计和安装热优化的能量桩。 为了实现这一目标，该项目将首先设计，制造和利用实验室规模设备，以测试具有不同土壤条件和不同边界条件的模型工程过渡区桩。 这些测试将用于验证其他数值模拟，以扩展原始概念验证数值模型研究的发现以设计原型全尺度场系统。 与行业合作伙伴合作，将在一系列试验中安装和监视全面的现场系统，以评估最初的响应以及系统的长期性能，因为加热和冷却周期将应用于系统。 现场使用的安装方法涉及现有设备的战略性重新利用，以允许新的热桩配置的分期安装程序。 这对于在实践中采用该方法具有重要意义。 完成全尺度现场测试后，将开发出一种设计方法，用于在各种地下条件下使用不同维度的工程热过渡区的设计方法。

项目成果

Suction and thermal conductivity of unsaturated loess from Northern France

法国北部非饱和黄土的吸力和导热系数

• 发表时间: 2018
• 期刊: UNSAT 2018
• 作者: Nguyen, V

Water retention and thermal conductivity of a natural unsaturated loess

• DOI: 10.1680/jgele.17.00037
• 发表时间: 2017-11
• 期刊: Geotechnique Letters
• 影响因子: 2.1
• 作者: V. Nguyen;H. Heindl;Jean-Michel Pereira;A. Tang;J. Frost