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Development of a Variable Water Flow Rate Control Method for the Circulation Pump in a Geothermal Heat Pump System

Author

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  • Ji-Hyun Shin

    (Department of Architectural Engineering, Graduate School of Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongbuk 38541, Korea)

  • Young-Hum Cho

    (School of Architecture, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongbuk 38541, Korea)

Abstract

This study assessed a variable flow rate control method for a circulation pump based on the geothermal water temperature difference in a geothermal heat pump system. As interest in energy conservation and efficient use is increasing around the world, the development and use of renewable energy is increasing and various related studies are currently underway. Among the renewable energy systems, the interest in geothermal energy system is high because of its efficient year-round operation. Geothermal heat pump system installations have increased in number, but the systems operate inefficiently. Generally in Korea, geothermal heat pump system operates under partial load conditions, but the circulation pump operates at constant speed and supplies a constant flow rate. Therefore, this study examined the operation of the current problems of a geothermal heat pump system. A variable flow rate control method of the circulation pump is proposed to improve the efficiency of the geothermal heat pump system and save energy during the cooling operation. As a result, the total energy consumption was reduced by 57,017 kW compared to the existing flow rate control method and the energy consumption of the circulation pump system was reduced by 35,209 kW.

Suggested Citation

  • Ji-Hyun Shin & Young-Hum Cho, 2018. "Development of a Variable Water Flow Rate Control Method for the Circulation Pump in a Geothermal Heat Pump System," Energies, MDPI, vol. 11(4), pages 1-18, March.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:4:p:718-:d:137597
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    References listed on IDEAS

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    1. Girard, Aymeric & Gago, Eulalia Jadraque & Muneer, Tariq & Caceres, Gustavo, 2015. "Higher ground source heat pump COP in a residential building through the use of solar thermal collectors," Renewable Energy, Elsevier, vol. 80(C), pages 26-39.
    2. Ioan Sarbu & Calin Sebarchievici, 2016. "Performance Evaluation of Radiator and Radiant Floor Heating Systems for an Office Room Connected to a Ground-Coupled Heat Pump," Energies, MDPI, vol. 9(4), pages 1-19, March.
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    Cited by:

    1. Ji-Hyun Shin & Yong-In Kim & Young-Hum Cho, 2019. "Development of Operating Method of Multi-Geothermal Heat Pump Systems Using Variable Water Flow Rate Control and a COP Prediction Model Based on ANN," Energies, MDPI, vol. 12(20), pages 1-18, October.
    2. Tawfik Elshehabi & Mohammad Alfehaid, 2025. "Sustainable Geothermal Energy: A Review of Challenges and Opportunities in Deep Wells and Shallow Heat Pumps for Transitioning Professionals," Energies, MDPI, vol. 18(4), pages 1-29, February.
    3. Ji-Hyun Shin & Hyo-Jun Kim & Han-Gyeol Lee & Young-Hum Cho, 2023. "Variable Water Flow Control of Hybrid Geothermal Heat Pump System," Energies, MDPI, vol. 16(17), pages 1-18, August.

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