Ornelles Adam D, Falta Ronald W, Divine Craig E
Department of Environmental Engineering and Earth Sciences, Clemson University, Brackett Hall Room 336, Clemson, SC, 29634-0919.
Arcadis, Nixa, MO, 65714.
Ground Water. 2023 Mar;61(2):245-254. doi: 10.1111/gwat.13265. Epub 2022 Nov 4.
Low temperature heating of the subsurface (increases of about 5-20 °C) can substantially increase rates of biotic and abiotic destruction of dissolved contaminants such as chlorinated solvents. Low-temperature heating can be sustainably and cost-effectively achieved using solar thermal collectors coupled with closed-loop borehole heat exchangers. This technology has been implemented at several sites in the United States and abroad with favorable results. The design of a solar thermal remediation system requires a quantitative understanding of heat transfer from the array of borehole heat exchangers. We present an easy-to-use design tool that is based on a transient three-dimensional analytical heat transfer solution and is programmed in Visual Basic in Excel. This tool can be used to quickly explore the effect of design variables on the forecast temperature field. Typical design variables would include the site-specific average and monthly solar insolation data, solar collector configuration, borehole heat exchanger geometry and spacing, and the effects of environmental variables such as groundwater velocity, background subsurface temperature, and thermal conductivity. The design tool has been verified by comparisons with the TOUGH2 multiphase heat transfer code for a three-dimensional multi-heater system with seasonally variable thermal power rates. The code has been validated by comparisons to observed temperatures measured at a solar thermal field remediation application at a site in Colorado.
地下低温加热（温度升高约5-20°C）可大幅提高生物和非生物对溶解污染物（如氯化溶剂）的破坏速率。利用太阳能集热器与闭环钻孔热交换器相结合，可实现低温加热的可持续性和成本效益。该技术已在美国和国外的多个场地实施，并取得了良好效果。太阳能热修复系统的设计需要对钻孔热交换器阵列的热传递有定量的了解。我们提出了一种易于使用的设计工具，它基于瞬态三维解析热传递解，并在Excel中用Visual Basic编程。该工具可用于快速探究设计变量对预测温度场的影响。典型的设计变量包括特定场地的平均和月度太阳辐射数据、太阳能集热器配置、钻孔热交换器的几何形状和间距，以及环境变量的影响，如地下水速度、背景地下温度和热导率。通过与用于具有季节性变化热功率率的三维多加热器系统的TOUGH2多相热传递代码进行比较，验证了该设计工具。通过与在科罗拉多州一个场地的太阳能热场修复应用中测量的观测温度进行比较，验证了该代码。
