Heat transfer characteristics and heat conductivity prediction model of waste steel slag–clay backfill material

Xu, Yongjie; Yao, Zhishu; Huang, Xianwen; Fang, Yu; Shu, Siyuan; Zhu, Hongwei

doi:10.1016/j.tsep.2023.102203

Cited by 5 publications

(1 citation statement)

References 45 publications

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“…The addition of graphite had little effect on the mechanical properties of backfill materials, but the compressive strength could be increased by 97.5% by adding waste steel slag. Xu et al [28] proposed to use the waste steel slag-clay mixture as the backfill material for ground source heat pumps and investigated the heat transfer rule of the backfill material from the micro-scope perspective. Song et al [29] studied the influence of the thermal conductivity of backfill materials on the heat transfer efficiency in summer conditions by establishing the heat transfer characterization model of double vertical U-tubes.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Mechanism of Heat–Cold Alternate Extraction in a Shallow Geothermal Buried Pipe System under Multiple Heat Exchanger Groups

Shi,

Zhang,

Wang

et al. 2023

Energies

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Shallow geothermal energy usually uses underground buried pipes to achieve the purpose of extracting heat while storing cold in winter and extracting cold while storing heat in summer. However, the heat transfer mechanism under the alternate operation of heat–cold extraction in winter and summer under multiple heat exchanger groups is still worth studying. Based on the constructed flow and heat transfer model in pipelines and reservoirs, this study first analyzes the temperature field evolution of a shallow buried pipe system (SBPS) under the alternate operation of heat–cold extraction, and then discusses the heat transfer performance under different pipeline flow rates, pipeline wall thermal conductivity, heat injection durations, numbers of heat exchanger groups, and flows of underground fluid. The results show that the continuous alternating process of heat–cold extraction has a promoting effect on the temperature increase or decrease in the next operating cycle due to the low- or high-temperature zone produced in the previous operating cycle. As the number of multiple heat exchanger groups increases, the heat transfer efficiency of the SBPS significantly improves. With a rise in the groundwater flow velocity, the heat transfer efficiency first decreases and then increases.

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Section: Introductionmentioning

confidence: 99%

Heat Transfer Mechanism of Heat–Cold Alternate Extraction in a Shallow Geothermal Buried Pipe System under Multiple Heat Exchanger Groups

Shi,

Zhang,

Wang

et al. 2023

Energies

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Recycling Bottom Ash and Steel Slag Containing CaO into Electrically Insulating and Heat‐Dissipating Thermal Interface Materials

Kang,

Hong

et al. 2024

Adv Energy and Sustain Res

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Bottom ash (BA) and steel slag (SS) wastes are generated in large quantities and primarily recycled as raw materials for concrete. However, the influx of expansive components can cause pop‐outs in concrete and reduce the mechanical properties of concrete, prompting the need for alternative recycling methods. Herein, as a new method of recycling BA and SS, an electrically insulating and thermally conductive thermal interface material (TIM) is proposed by incorporating BA or SS filler into a polymer. CaO, which has historically been an obstacle to efficient recycling BA and SS into concrete, is found to improve the thermal conductivity of TIMs. The resulting TIMs exhibit both effective electrical insulation (<2.99 × 10−9 S m−1) and thermal dissipation (3.64 W m−1 K−1) properties. The proposed recycling method based on BA and SS can contribute to the development of low‐cost, electrically insulating, and heat‐dissipating TIMs.

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Assessment of thermal conductivity prediction models for compacted bentonite-based backfill material

Sah,

Kumar

2024

Int. J. Environ. Sci. Technol.

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Heat transfer characteristics and heat conductivity prediction model of waste steel slag–clay backfill material

Cited by 5 publications

References 45 publications

Heat Transfer Mechanism of Heat–Cold Alternate Extraction in a Shallow Geothermal Buried Pipe System under Multiple Heat Exchanger Groups

Heat Transfer Mechanism of Heat–Cold Alternate Extraction in a Shallow Geothermal Buried Pipe System under Multiple Heat Exchanger Groups

Recycling Bottom Ash and Steel Slag Containing CaO into Electrically Insulating and Heat‐Dissipating Thermal Interface Materials

Assessment of thermal conductivity prediction models for compacted bentonite-based backfill material

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