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Performance Analysis of Solar-Assisted Ground-Coupled Heat Pump Systems with Seasonal Thermal Energy Storage to Supply Domestic Hot Water for Campus Buildings in Southern China

Author

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  • Jin Zhou

    (School of Architecture, Hunan University, Changsha 410082, China
    Hunan Key Laboratory of Sciences of Urban and Rural Human Settlements in Hills Areas, Hunan University, Changsha 410082, China)

  • Zhikai Cui

    (College of Civil Engineering, Hunan University, Changsha 410082, China)

  • Feng Xu

    (School of Architecture, Hunan University, Changsha 410082, China
    Hunan Key Laboratory of Sciences of Urban and Rural Human Settlements in Hills Areas, Hunan University, Changsha 410082, China)

  • Guoqiang Zhang

    (College of Civil Engineering, Hunan University, Changsha 410082, China)

Abstract

The supply of domestic hot water (DHW) on college and university campuses is indispensable and is also one of the main components of campus energy consumption. The density of residential patterns and similar occupancy behavior of college students make it economical to use centralized systems to cover the DHW demand, and utilization of solar energy can make the systems more economical. Seasonal thermal energy storage (STES) is a promising key technology that can minimize the imbalance between the availability of solar energy and thermal energy demand. In this paper, a solar-assisted ground-coupled heat pump (SAGCHP) system that meets the DHW demand of 960 students was investigated by means of dynamic simulation and energy-economic analysis. The simulation results in terms of the underground heat balance are compared with a standalone GCHP system and a SAGCHP system without STES. Results show that heat recharging operations during university summer and winter breaks (when there are minimal students on campus) lead to improved underground heat balance and energy performance. Finally, a sensitivity analysis on system performance was carried out by varying solar collector arrays. It was found that there exists an optimal value of solar collector area to achieve the lowest system lifecycle cost (LCC).

Suggested Citation

  • Jin Zhou & Zhikai Cui & Feng Xu & Guoqiang Zhang, 2021. "Performance Analysis of Solar-Assisted Ground-Coupled Heat Pump Systems with Seasonal Thermal Energy Storage to Supply Domestic Hot Water for Campus Buildings in Southern China," Sustainability, MDPI, vol. 13(15), pages 1-23, July.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:15:p:8344-:d:601950
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    References listed on IDEAS

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    1. Zhai, X.Q. & Qu, M. & Yu, X. & Yang, Y. & Wang, R.Z., 2011. "A review for the applications and integrated approaches of ground-coupled heat pump systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(6), pages 3133-3140, August.
    2. Rad, Farzin M. & Fung, Alan S., 2016. "Solar community heating and cooling system with borehole thermal energy storage – Review of systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 60(C), pages 1550-1561.
    3. Ciampi, Giovanni & Rosato, Antonio & Sibilio, Sergio, 2018. "Thermo-economic sensitivity analysis by dynamic simulations of a small Italian solar district heating system with a seasonal borehole thermal energy storage," Energy, Elsevier, vol. 143(C), pages 757-771.
    4. Flynn, Ciarán & Sirén, Kai, 2015. "Influence of location and design on the performance of a solar district heating system equipped with borehole seasonal storage," Renewable Energy, Elsevier, vol. 81(C), pages 377-388.
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    Cited by:

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    2. Jordi García-Céspedes & Ignasi Herms & Georgina Arnó & José Juan de Felipe, 2022. "Fifth-Generation District Heating and Cooling Networks Based on Shallow Geothermal Energy: A review and Possible Solutions for Mediterranean Europe," Energies, MDPI, vol. 16(1), pages 1-31, December.
    3. Dongli Tan & Yao Wu & Zhiqing Zhang & Yue Jiao & Lingchao Zeng & Yujun Meng, 2023. "Assessing the Life Cycle Sustainability of Solar Energy Production Systems: A Toolkit Review in the Context of Ensuring Environmental Performance Improvements," Sustainability, MDPI, vol. 15(15), pages 1-37, July.

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