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)

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 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
JournalEnergy
Volume82
DOIs
Publication statusPublished - 2015 Mar 15

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Geothermal heat pumps
Cooling
Flow of fluids
Degradation

Keywords

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

ASJC Scopus subject areas

  • Energy(all)
  • Pollution

Cite this

Comparison on the transient cooling performances of hybrid ground-source heat pumps with various flow loop configurations. / Lee, Joo Seong; Song, Kang Sub; Ahn, Jae Hwan; Kim, Yong Chan.

In: Energy, Vol. 82, 15.03.2015, p. 678-685.

Research output: Contribution to journalArticle

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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.",
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AB - 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.

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