Distribution characteristics and utilization of shallow geothermal energy in China

Xu, Ye‐Shuang; Wang, Xuwei; Shen, Shui‐Long; Zhou, Annan

doi:10.1016/j.enbuild.2020.110479

Cited by 47 publications

(15 citation statements)

References 64 publications

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“…(4) The influence of groundwater on the heat exchange of energy pile is ignored. (5) The change of soil temperature along the depth direction is ignored. (6) The influence of environmental factors on shallow soil temperature is ignored.…”

Section: Basic Assumptionsmentioning

confidence: 99%

“…This technology solves the large footprint of ground source heat pumps (GSHP) and can be constructed at the same time as the pile foundation, shortening the construction period [3]. Due to its stability, large reserves and wide distribution, shallow geothermal materials have broad application prospects in the field of building heating systems [4,5]. Existing geothermal engineering developments and applications show that when the drilling depth is 100~300 m, shallow geothermal materials can be utilized to the greatest extent, and that the heat exchange system has the lowest power consumption when the drilling depth is approximately 100 m [6].…”

Section: Introductionmentioning

confidence: 99%

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Research on Heat Exchange Law and Structural Design Optimization of Deep Buried Pipe Energy Piles

et al. 2021

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A deeply buried pipe energy pile (DBP-EP) combines the advantages of a ground source heat pump (GSHP) and an inside buried pipe energy pile (IBP-EP) and is an efficient, clean, and energy-saving technology. Based on field tests and numerical simulations, this paper explores the temperature distribution and heat exchange effects of DBP-EP under different influencing factors. The results show that when the pile-to-well ratio is approximately 0.3–0.4, the heat exchange of the energy pile obtains the best benefit; the inlet water temperature is the most significant factor affecting the heat exchange effect of the energy pile, and when combined with a reasonable pile-to-well ratio, the energy pile obtains the best heat exchange effect; the flow rate has a significant impact on the heat exchange effect of the energy pile, but needs to be set reasonably according to the pile-to-well ratio; the influence of inlet water temperature, well depth, flow rate, and pile length on the heat exchange efficiency of the energy pile is gradually weakened. The research results of this paper provide a theoretical basis for the structural design optimization of DBP-EP and promote the popularization and application of energy pile technology.

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Section: Basic Assumptionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on Heat Exchange Law and Structural Design Optimization of Deep Buried Pipe Energy Piles

et al. 2021

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“…Also, while the contribution of subsurface urban heat islands to atmospheric temperatures has not yet been quantified, it is likely that cooling the underground will play at least a marginal role in mitigating urban warming 27 . More importantly, shallow subsurface heat recycling is a sustainable and renewable heating source and can therefore reduce this sector’s carbon footprint 28 , 29 . This is particularly relevant as heating is the dominant residential energy use in many locations: 60% and 75% of the residential energy consumption are used for space and water heating in the US 30 and Europe 31 , respectively.…”

Section: Introductionmentioning

confidence: 99%

Shallow subsurface heat recycling is a sustainable global space heating alternative

et al. 2022

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Despite the global interest in green energy alternatives, little attention has focused on the large-scale viability of recycling the ground heat accumulated due to urbanization, industrialization and climate change. Here we show this theoretical heat potential at a multi-continental scale by first leveraging datasets of groundwater temperature and lithology to assess the distribution of subsurface thermal pollution. We then evaluate subsurface heat recycling for three scenarios: a status quo scenario representing present-day accumulated heat, a recycled scenario with ground temperatures returned to background values, and a climate change scenario representing projected warming impacts. Our analyses reveal that over 50% of sites show recyclable underground heat pollution in the status quo, 25% of locations would be feasible for long-term heat recycling for the recycled scenario, and at least 83% for the climate change scenario. Results highlight that subsurface heat recycling warrants consideration in the move to a low-carbon economy in a warmer world.

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“…Shallow geothermal energy (SGE) is a part of geothermal resources, which generally refers to the thermal energy resources in the interior of the earth with a temperature of less than 25 °C from the thermostatic zone to 200 m burial depth, and has the value of development and utilization at present. In China, it has been proven that the SGE resources available within 1.69 × 10 5 km 2 are equivalent to 7 × 10 12 kg of coal (Xu et al, 2020). In 2021, 58.8% of geothermal energy resources was extracted through ground source heat pumps (GSHP) (Lund et al, 2021), which provide energy by the borehole heat exchanger (BHE) (Sarbu et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

AHP-Based Evaluation of the Suitability of Shallow Geothermal Energy Utilization in GSHP System

Dong

Liu

et al. 2022

Front. Energy Res.

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Shallow geothermal energy (SGE) is a part of geothermal resources and is mainly used through ground source heat pumps (GSHP). However, the potential of SGE varies from region to region due to different geological conditions. There is a lack of regulations and codes for assessing SGE, which makes the design and planning of GSHP restricted. In this study, an evaluation system of the suitability of GSHP in a region of Qingdao by using Analytic Hierarchy Process (AHP) is proposed, and the test area is divided into three suitability levels based on suitability scores. The evaluation system contains property indicators, elemental indicators, and their weights. The result shows that the highly suitable area for the application of GSHP in the test area is 110.04 km2, accounting for 41.8% of the whole test area. The area of moderately suitable area is 65.02 km2, accounting for 24.7%, and GSHP should be developed and utilized on the basis of full demonstration in this level. The unsuitable area for GSHP is 88.19 km2, accounting for 33.5%. The indicator weights in this article may only be applicable to the Qingdao area and cities with similar geological conditions to Qingdao. However, the indicators within this evaluation system can be applied to the vast majority of locations where GSHP are to be developed, as it provides a method of assessment in terms of geological conditions, groundwater conditions, construction conditions, and ecological aspects.

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Distribution characteristics and utilization of shallow geothermal energy in China

Cited by 47 publications

References 64 publications

Research on Heat Exchange Law and Structural Design Optimization of Deep Buried Pipe Energy Piles

Research on Heat Exchange Law and Structural Design Optimization of Deep Buried Pipe Energy Piles

Shallow subsurface heat recycling is a sustainable global space heating alternative

AHP-Based Evaluation of the Suitability of Shallow Geothermal Energy Utilization in GSHP System

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