Study on thermal performance of casing-type mine heat recovery device with phase change materials filling in annular space,International Journal of Energy Research

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Study on thermal performance of casing-type mine heat recovery device with phase change materials filling in annular space
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2021-08-01 , DOI: 10.1002/er.7008
Xiaoyan Zhang ₁ , Muyan Xu ₁ , Lang Liu _{1,

2} , Qixing Yang ₁ , KI‐IL Song ₃

Affiliation

The underground mine contains abundant geothermal energy resources. The casing-type mine heat recovery device with encapsulated phase change material (PCM) embedded in the backfill body is efficient technology for extraction of geothermal energy in mines. A heat transfer model of a casing-type mine heat recovery unit was established to study the influence of PCMs thermophysical property and phase transition process on the thermal performance of backfill body. The effects of phase transition temperature, thermal conductivity, specific heat capacity and phase transition latent heat of PCMs on the temperature variation in backfill body and the thermal performance of casing-type mine heat recovery device were studied in the heat storage/release mode. The result indicates that the phase transition temperature is expected to be lower in heat storage mode and higher in heat release mode, respectively. The heat transfer rate can be significantly enhanced by PCMs with larger thermal conductivity in both heat storage and heat release modes. Furthermore, PCMs with large specific heat capacity and latent heat should be used to improve the energy storage effect. After 10 hours of heat storage/release, when the specific heat capacity increases from 1000 to 3000 J/(kg ∙ K), the heat storage capacity and heat extraction capacity increased by 9.11% and 6.69%, respectively; when the phase transition latent heat increases from 100 to 200 kJ/Kg, the heat storage capacity and heat extraction capacity increased by 4.79% and 3.29%, respectively.

中文翻译：

环形空间填充相变材料套管式矿山热回收装置热性能研究

地下矿山蕴藏着丰富的地热能源。在回填体中嵌入包封相变材料（PCM）的套管式矿山热回收装置是矿山地热能提取的有效技术。建立套管式矿山热回收装置传热模型，研究PCMs热物性和相变过程对充填体热性能的影响。研究了相变温度、热导率、比热容和相变潜热对充填体温度变化和套管式矿山热回收装置在蓄热/放热方式下热性能的影响。结果表明，预计相变温度在蓄热模式下较低，在放热模式下较高。在储热和放热模式下具有较大热导率的 PCM 可以显着提高传热率。此外，应使用比热容和潜热大的相变材料来提高储能效果。蓄热/放热10小时后，当比热容从1000增加到3000J/(kg·K)时，蓄热能力和排热能力分别提高了9.11%和6.69%；当相变潜热从 100 kJ/Kg 增加到 200 kJ/Kg 时，蓄热能力和排热能力分别提高了 4.79% 和 3.29%。在储热和放热模式下具有较大热导率的 PCM 可以显着提高传热率。此外，应使用比热容和潜热大的相变材料来提高储能效果。蓄热/放热10小时后，当比热容从1000增加到3000J/(kg·K)时，蓄热能力和排热能力分别提高了9.11%和6.69%；当相变潜热从 100 kJ/Kg 增加到 200 kJ/Kg 时，蓄热能力和排热能力分别提高了 4.79% 和 3.29%。在储热和放热模式下具有较大热导率的 PCM 可以显着提高传热率。此外，应使用比热容和潜热大的相变材料来提高储能效果。蓄热/放热10小时后，当比热容从1000增加到3000J/(kg·K)时，蓄热能力和排热能力分别提高了9.11%和6.69%；当相变潜热从 100 kJ/Kg 增加到 200 kJ/Kg 时，蓄热能力和排热能力分别提高了 4.79% 和 3.29%。应使用比热容和潜热大的相变材料来提高储能效果。蓄热/放热10小时后，当比热容从1000增加到3000J/(kg·K)时，蓄热能力和排热能力分别提高了9.11%和6.69%；当相变潜热从 100 kJ/Kg 增加到 200 kJ/Kg 时，蓄热能力和排热能力分别提高了 4.79% 和 3.29%。应使用比热容和潜热大的相变材料来提高储能效果。蓄热/放热10小时后，当比热容从1000增加到3000J/(kg·K)时，蓄热能力和排热能力分别提高了9.11%和6.69%；当相变潜热从 100 kJ/Kg 增加到 200 kJ/Kg 时，蓄热能力和排热能力分别提高了 4.79% 和 3.29%。

更新日期：2021-09-09

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