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Experiment and simulation of temperature characteristics of intermittently-controlled ground heat exchanges

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  • Gao, Qing
  • Li, Ming
  • Yu, Ming

Abstract

Because of poor heat transfer coefficients of soil/rock, ground source heat pumps (GSHP) or underground thermal energy storage (UTES) systems always occupy a large area and need many ground heat exchangers. This initial energy investment is so heavy that it cannot be used on a large-scale. Intermittent operation can reduce the extreme temperatures around the ground heat exchangers (GHEs) and keep the temperature in reasonable range. The aim of this study is to implement an experiment and develop a dynamic model of hydronic heating systems of GSHP in order to get a more fair comparison of energy efficiency between continuously controlled and intermittently controlled systems. Factors such as thermal inertia, temperature levels and lag time are also considered to see how they affect the efficiency. It is shown that temperature variation is related to the intermittent period and that intermittence prolongs the heat transfer without reaching at an utmost temperature (operation limitation). An effectively controlled intermittent process can optimize the capacity of heat exchange units so as to achieve better application of the ground energy. Additionally, the intermittent control can decrease the number of GHEs of GSHP and UTES systems and keep better working conditions.

Suggested Citation

  • Gao, Qing & Li, Ming & Yu, Ming, 2010. "Experiment and simulation of temperature characteristics of intermittently-controlled ground heat exchanges," Renewable Energy, Elsevier, vol. 35(6), pages 1169-1174.
    • Handle: RePEc:eee:renene:v:35:y:2010:i:6:p:1169-1174
    DOI: 10.1016/j.renene.2009.10.039
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    References listed on IDEAS

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    1. Florides, Georgios & Kalogirou, Soteris, 2007. "Ground heat exchangers—A review of systems, models and applications," Renewable Energy, Elsevier, vol. 32(15), pages 2461-2478.
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    Cited by:

    1. Faizal, Mohammed & Bouazza, Abdelmalek & Singh, Rao M., 2016. "Heat transfer enhancement of geothermal energy piles," Renewable and Sustainable Energy Reviews, Elsevier, vol. 57(C), pages 16-33.
    2. Yuan, Yanping & Cao, Xiaoling & Sun, Liangliang & Lei, Bo & Yu, Nanyang, 2012. "Ground source heat pump system: A review of simulation in China," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(9), pages 6814-6822.
    3. Yong Li & Shibin Geng & Xu Han & Hua Zhang & Fusheng Peng, 2017. "Performance Evaluation of Borehole Heat Exchanger in Multilayered Subsurface," Sustainability, MDPI, vol. 9(3), pages 1-16, March.
    4. Qi, Zishu & Gao, Qing & Liu, Yan & Yan, Y.Y. & Spitler, Jeffrey D., 2014. "Status and development of hybrid energy systems from hybrid ground source heat pump in China and other countries," Renewable and Sustainable Energy Reviews, Elsevier, vol. 29(C), pages 37-51.
    5. Zhao, Zilong & Lin, Yu-Feng & Stumpf, Andrew & Wang, Xinlei, 2022. "Assessing impacts of groundwater on geothermal heat exchangers: A review of methodology and modeling," Renewable Energy, Elsevier, vol. 190(C), pages 121-147.
    6. Chaofeng Li & Jinfeng Mao & Zheli Xing & Jin Zhou & Yong Li, 2015. "Analysis of Geo-Temperature Restoration Performance under Intermittent Operation of Borehole Heat Exchanger Fields," Sustainability, MDPI, vol. 8(1), pages 1-14, December.
    7. Zhu, Li & Chen, Sarula & Yang, Yang & Tian, Wei & Sun, Yong & Lyu, Mian, 2019. "Global sensitivity analysis on borehole thermal energy storage performances under intermittent operation mode in the first charging phase," Renewable Energy, Elsevier, vol. 143(C), pages 183-198.
    8. Kindaichi, Sayaka & Nishina, Daisaku, 2018. "Simple index for onsite operation management of ground source heat pump systems in cooling-dominant regions," Renewable Energy, Elsevier, vol. 127(C), pages 182-194.
    9. Ogunleye, Oluwaseun & Singh, Rao Martand & Cecinato, Francesco & Chan Choi, Jung, 2020. "Effect of intermittent operation on the thermal efficiency of energy tunnels under varying tunnel air temperature," Renewable Energy, Elsevier, vol. 146(C), pages 2646-2658.

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