不同运行策略下能源桩群热力学行为的实验和数值研究

IF 3.5 2区 工程技术 Q3 ENERGY & FUELS
Weibo Yang, Chengrong Wang, Chaoyi Yan, Feng Wang
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引用次数: 0

摘要

能源桩通常以桩群形式运行,其热力学(TM)行为受运行策略的影响很大。为研究不同启停时间比和管道连接形式下能源桩群的热力学行为,建立了布局为 3 × 3 的能源桩群模型试验台。试验结果表明,在目前的试验条件下,提高启停时间比会导致桩群蓄热和取热量的增加,但桩周围土体的温度并没有得到很好的恢复,进而导致桩的变形程度增加。对于桩埋管的连接形式,三种串联形式下的蓄热量均小于传统的并联形式。但串联形式下的桩群力学性能优于并联形式,有助于减轻桩的变形程度。建立了一个 4 × 4 群桩模型,以进一步发现两种操作策略(即冬季模式下在不同位置打开部分桩和内外区桩的非均匀强度操作)对能源桩群 TM 特性的影响。结果表明,与全部打桩相比,部分打桩增加了运行中的桩的轴向力。同时,在汲取热量期间,打八根边桩比打四根内桩和四根角桩每月汲取更多的热量。四种内外分区非均匀强度运行模式具有不同的储能和热力学特性。应根据实际情况选择最合适的模式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental and numerical investigations on thermo-mechanical behaviors of energy pile group under different operational strategies

Energy piles are often operated in the form of pile group, and their thermo-mechanical (TM) behaviors are strongly affected by the operational strategies. A model experimental bench of energy pile group with the layout of 3 × 3 was established to investigate the TM behaviors of energy pile group under different start-stop time ratios and pipe connection forms. The test results show that under the current test conditions, raising the start-stop time ratio leads to the increase of heat storage and extraction amount by the pile group, but the temperature of soil around the pile is not well recovered, which in turn results in the rise of deformation degree of pile. For the connection forms of pile buried pipe, the heat storage amount under three kinds of series connection forms is less than that under the conventional parallel connection form. However, the mechanical properties of pile group under the series connection forms are better than those of parallel connection form, which helps to alleviate the pile deformation degree. A 4 × 4 group pile model was developed to further find the effects of two operation strategies, namely, opening partial piles at different locations in winter mode and non-uniform intensity operation of piles in the inner and outer zones, on the TM characteristics of energy pile group. The results showed that opening partial piles increased the axial force of pile in the running piles relative to opening all the piles. Meanwhile, opening eight side piles extracted more heat per month during the heat extraction period relative to opening four internal piles and four corner piles. The four kinds of internal and external zoned non-uniform strength operation modes have different energy storage and thermodynamic properties. The most suitable mode should be selected considering the actual situation.

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来源期刊
Geothermics
Geothermics 工程技术-地球科学综合
CiteScore
7.70
自引率
15.40%
发文量
237
审稿时长
4.5 months
期刊介绍: Geothermics is an international journal devoted to the research and development of geothermal energy. The International Board of Editors of Geothermics, which comprises specialists in the various aspects of geothermal resources, exploration and development, guarantees the balanced, comprehensive view of scientific and technological developments in this promising energy field. It promulgates the state of the art and science of geothermal energy, its exploration and exploitation through a regular exchange of information from all parts of the world. The journal publishes articles dealing with the theory, exploration techniques and all aspects of the utilization of geothermal resources. Geothermics serves as the scientific house, or exchange medium, through which the growing community of geothermal specialists can provide and receive information.
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