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

Joo Seong Lee, Kang Sub Song, Jae Hwan Ahn, Yong Chan Kim

Research output: Contribution to journalArticle

9 Citations (Scopus)


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 HGSHP<inf>S</inf> (HGSHP with the serial configuration) and HGSHP<inf>P</inf> (HGSHP with the parallel configuration), and GSHP. During the hybrid operation, the HGSHP<inf>S</inf> showed relatively higher COP (coefficient of performance) than the HGSHP<inf>P</inf> 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 HGSHP<inf>S</inf> and HGSHP<inf>P</inf> were 15% and 7% higher, respectively, than that in the GSHP.

Original languageEnglish
Pages (from-to)678-685
Number of pages8
Publication statusPublished - 2015 Mar 15



  • COP (coefficient of performance)
  • Ground heat exchanger
  • Ground thermal condition
  • Heat accumulation
  • Hybrid ground-source heat pump

ASJC Scopus subject areas

  • Energy(all)
  • Pollution

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