Abstract
In the past 30 years, because of built-in advantages, energy saving, pollution control, and sustainability, the energy pile system has had a rapid development around the world. Many scholars did numerous researches on the parameters’ optimization, heat exchange efficiency, and structure-soil response. Also, the researches of evolutional GSHP system using high temperature in deep mine and lager collection surface of tunnel lining were learned. At present, most of researchers are discussing the geothermal collection for the heating or cooling the building, and plenteous and significant research achievements have been obtained. It is a novel attempt to apply energy pile to geotechnical engineering, and good results have been achieved in engineering practice in Northern China. The area of northern China is a typical seasonal frozen region: the high temperature in summer and the cold weather and accumulated snow in winter will result in huge challenge and resource consumption of maintaince on highway tunnel, pavement, and other geotechnical engineering facilities. In this paper, taking example of using the geothermal heat exchanger to melt snow, the novel idea of using energy piles to prevent track in summer and crack in winter of pavement, and guaranteeing the safety of frost crack on tunnel lining were discussed. Also, through simulation research, we propose a buried pipe form with good heat transfer uniformity-spiral buried pipe, which has better engineering applicability. This shows us that the application of energy pile in geotechnical engineering will provide solutions to geotechnical problems, which will have a brilliant future.
Highlights
In the background of the global energy crisis, energy pile is a form of green and sustainable energy utilization, or one of the solutions to energy problems
Lopez et al evaluated energy consumption and sustainability of road tunnels [67]. e typical tunnel lining was equipped as ground heat exchanger as shown in Figure 4. rough the pipeline buried on the lining surface, the heat on the tunnel surface is collected to the heat collecting pipe to realize the efficient utilization of geothermal energy
In the recent 30 years, a large number of scholars have conducted extensive and in-depth research on the energy pile system. rough experimental research and numerical simulation, from parameter optimization and heat transfer efficiency to structure-soil response, they continuously promote the application of energy pile system from theory to engineering practice
Summary
In the background of the global energy crisis, energy pile is a form of green and sustainable energy utilization, or one of the solutions to energy problems. In the interest of improving the heat exchange efficiency, many scholars did numerous researches on the parameters’ optimization. Bozis et al evaluated the effects of design parameters on the heat transfer efficiency and developed a methodology for comparative estimation of design alternatives of cast-in-place of energy piles [6]. The latest studies show that spiral coil with the largest heat exchange surface of the fluid tube is the optimal type of heat exchanger cast-in-place energy pile. Li et al researched the heat transfer performance of the U-tube heat exchangers with different backfill materials (shape-stabilized phase change materials and crushed stone concrete) [32]. To achieve improvement of the heat exchange efficiency, scholars have discussed the parameters’ optimization, types of heat exchangers cast-inplace energy piles, and the backfill material with high. By studying the above references, plenteous and significant achievements on the research of energy pile system were realized, and it has been widely used in green energy-saving buildings in China, European countries, Canada, Japan, and other countries
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