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Development of the Performance Prediction Equation for a Modular Ground Heat Exchanger

Author

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  • Jaemin Kim

    (Department of Architectural Engineering, Pusan National University, 2 Busandaehak-ro 63, Geomjeong-gu, Busan 46241, Korea)

  • Yujin Nam

    (Department of Architectural Engineering, Pusan National University, 2 Busandaehak-ro 63, Geomjeong-gu, Busan 46241, Korea)

Abstract

Although ground source heat pump (GSHP) systems are more efficient than conventional air source heat pump (ASHP) systems, their high initial investment cost makes it difficult to introduce them into small buildings. Therefore, the development of a method for reducing the installation costs of GSHPs for small buildings is essential. This study proposes a modular ground heat exchanger (GHX) for cost reduction and an improved workability of GSHPs. In addition, a numerical model was constructed for the analysis of the performance of the modular GHX. However, to easily introduce the new GHX at the building design stage, the development of a performance prediction method for the introduction of modular GHXs to small buildings is necessary. Therefore, the entering water temperature (EWT) equation was derived from the calculation methods in the heat transfer process, and the ground temperature model was developed in consideration of the operation condition. The numerical results showed that the average values of EWT and ground temperature were 8.11 °C and 8.00 °C, respectively under an average ambient temperature of 0.42 °C. In addition, the performance prediction model was compared with the numerical results. The results showed that the coefficient of variation of the root mean square error (RMSE) of the ground temperature and EWT model were 5.20% and 1.33%, respectively.

Suggested Citation

  • Jaemin Kim & Yujin Nam, 2020. "Development of the Performance Prediction Equation for a Modular Ground Heat Exchanger," Energies, MDPI, vol. 13(22), pages 1-13, November.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:22:p:6005-:d:446495
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    References listed on IDEAS

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    1. Chang, Keun Sun & Kim, Min Jun, 2016. "Thermal performance evaluation of vertical U-loop ground heat exchanger using in-situ thermal response test," Renewable Energy, Elsevier, vol. 87(P1), pages 585-591.
    2. Selamat, Salsuwanda & Miyara, Akio & Kariya, Keishi, 2016. "Numerical study of horizontal ground heat exchangers for design optimization," Renewable Energy, Elsevier, vol. 95(C), pages 561-573.
    3. Moon, Chung-Eun & Choi, Jong Min, 2015. "Heating performance characteristics of the ground source heat pump system with energy-piles and energy-slabs," Energy, Elsevier, vol. 81(C), pages 27-32.
    4. Naili, Nabiha & Hazami, Majdi & Attar, Issam & Farhat, Abdelhamid, 2013. "In-field performance analysis of ground source cooling system with horizontal ground heat exchanger in Tunisia," Energy, Elsevier, vol. 61(C), pages 319-331.
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    Cited by:

    1. Kim, Yu Jin & Entchev, Evgeuniy & Na, Sun Ik & Kang, Eun Chul & Baik, Young-Jin & Lee, Euy Joon, 2023. "Investigation of system optimization and control logic on a solar geothermal hybrid heat pump system based on integral effect test data," Energy, Elsevier, vol. 284(C).
    2. Joanna Kajewska-Szkudlarek & Jan Bylicki & Justyna Stańczyk & Paweł Licznar, 2021. "Neural Approach in Short-Term Outdoor Temperature Prediction for Application in HVAC Systems," Energies, MDPI, vol. 14(22), pages 1-15, November.
    3. Kwonye Kim & Jaemin Kim & Yujin Nam & Euyjoon Lee & Eunchul Kang & Evgueniy Entchev, 2021. "Analysis of Heat Exchange Rate for Low-Depth Modular Ground Heat Exchanger through Real-Scale Experiment," Energies, MDPI, vol. 14(7), pages 1-13, March.

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