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Investigation on Heat Transfer Properties of Supercritical Water in a Rock Fracture for Enhanced Geothermal Systems

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Abstract

Supercritical water (SCW) has shown promise as a working fluid to extract heat from hot dry rock (HDR); however, fundamental research on its heat transfer characteristics in HDR fractures is still required. A 2D heat transfer model that considers the variable thermophysical properties was updated to numerically investigate the effects of mass flow rate, thermal reservoir temperature, and fracture aperture size on the heat transfer characteristics of SCW flow through a single HDR fracture. The heat transfer performance of SCW and supercritical CO2 (scCO2) was compared under the same conditions. The results indicate that the heat transmission performance of SCW is superior to scCO2 at high temperature and high pressure. It is essential to synthesize the thermal reservoir temperature and pressure, site conditions, and heat transmission fluids during HDR development.

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Acknowledgements

The authors gratefully acknowledge support for this work from the National Natural Science Foundation of China (Grant No. 41672252) and the International Science & Technology Cooperation Program of China (S2016G9005) under the cooperation framework of the US–China Clean Energy Research Center (CERC).

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Authors and Affiliations

  1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China

    Yuanyuan He & Xiaochun Li

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Yuanyuan He

  3. Hubei Key Laboratory of Geo-Environmental Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China

    Bing Bai

Authors
  1. Yuanyuan He
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  2. Bing Bai
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Correspondence to Bing Bai.

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He, Y., Bai, B. & Li, X. Investigation on Heat Transfer Properties of Supercritical Water in a Rock Fracture for Enhanced Geothermal Systems. Int J Thermophys 39, 136 (2018). https://doi.org/10.1007/s10765-018-2455-3

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