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Comparison on the transient cooling performances of hybrid ground-source heat pumps with various flow loop configurations

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  • Lee, Joo Seong
  • Song, Kang Sub
  • Ahn, Jae Hwan
  • Kim, Yongchan

Abstract

A HGSHP (hybrid ground-source heat pump) is proposed to solve the performance degradation of the GSHP (ground-source heat pump) under imbalanced load conditions. The HGSHP is composed of three flow loops: a refrigerant flow loop, a GFL (ground flow loop), and a SFL (supplemental flow loop). In this study, the transient performance characteristics of the HGSHP were measured and analyzed in the cooling mode at various flow loop configurations, including the HGSHPS (HGSHP with the serial configuration) and HGSHPP (HGSHP with the parallel configuration), and GSHP. During the hybrid operation, the HGSHPS showed relatively higher COP (coefficient of performance) than the HGSHPP due to the lower heat accumulation in the ground under the degraded ground thermal condition. In addition, under the steady state condition, the COPs in the HGSHPS and HGSHPP were 15% and 7% higher, respectively, than that in the GSHP.

Suggested Citation

  • Lee, Joo Seong & Song, Kang Sub & Ahn, Jae Hwan & Kim, Yongchan, 2015. "Comparison on the transient cooling performances of hybrid ground-source heat pumps with various flow loop configurations," Energy, Elsevier, vol. 82(C), pages 678-685.
    • Handle: RePEc:eee:energy:v:82:y:2015:i:c:p:678-685
    DOI: 10.1016/j.energy.2015.01.076
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    4. Weibo Yang & Binbin Yang & Rui Xu, 2018. "Experimental Study on the Heat Release Operational Characteristics of a Soil Coupled Ground Heat Exchanger with Assisted Cooling Tower," Energies, MDPI, vol. 11(1), pages 1-17, January.
    5. Daemi, Negar & Krol, Magdalena M., 2019. "Impact of building thermal load on the developed thermal plumes of a multi-borehole GSHP system in different canadian climates," Renewable Energy, Elsevier, vol. 134(C), pages 550-557.
    6. Liu, Zhijian & Li, Yuanwei & Xu, Wei & Yin, Hang & Gao, Jun & Jin, Guangya & Lun, Liyong & Jin, Guohui, 2019. "Performance and feasibility study of hybrid ground source heat pump system assisted with cooling tower for one office building based on one Shanghai case," Energy, Elsevier, vol. 173(C), pages 28-37.
    7. Lee, Minwoo & Ham, Se Hyeon & Lee, Sewon & Kim, Jinyoung & Kim, Yongchan, 2023. "Multi-objective optimization of solar-assisted ground-source heat pumps for minimizing life-cycle cost and climate performance in heating-dominated regions," Energy, Elsevier, vol. 270(C).
    8. Olabi, Abdul Ghani & Mahmoud, Montaser & Soudan, Bassel & Wilberforce, Tabbi & Ramadan, Mohamad, 2020. "Geothermal based hybrid energy systems, toward eco-friendly energy approaches," Renewable Energy, Elsevier, vol. 147(P1), pages 2003-2012.

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