کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6766771 512456 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Spatiotemporal variability of ground thermal properties in glacial sediments and implications for horizontal ground heat exchanger design
ترجمه فارسی عنوان
تنوع اسپکترومغناطیسی خواص حرارتی زمین در رسوبات یخبندان و پیامدهای آن برای طراحی مبدلهای حرارتی زمین افقی
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
چکیده انگلیسی
Thorough characterization of the spatiotemporal variability in soil thermal properties can facilitate better designs for horizontal geothermal heat pump (HGHP) systems by reducing ground heat exchanger (GHEX) costs. Results are presented from a new monitoring network installed across a range of glaciated terrains in Indiana (USA), including the first known observations of the dynamic range of thermal conductivity that occurs at the depth of horizontal GHEX installations. In situ thermal conductivity data can vary significantly on a seasonal basis in coarse-grained outwash sediments (0.8-1.4 W m−1 K−1), whereas clay- and silt-dominated moraine sediments have a dampened seasonal range within 10% of the annual mean. Thermal conductivity across the network ranges from 0.8 to 2.0 W m−1 K−1 depending on soil parent material, climatic setting, and particularly, soil-moisture variability. Results indicate that the standard industry practice to estimate thermal properties from soil type often leads to suboptimal GHEX design (i.e., GHEX design lengths were 44-52% longer than necessary to meet performance specifications). This research suggests that expanding the characterization of soil thermal properties in specific settings where HGHPs are targeted will improve understanding of the dynamic aspects of ground heat exchange and lead to more optimal HGHP system designs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Renewable Energy - Volume 81, September 2015, Pages 21-30
نویسندگان
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