The cooling seasonal performance factor of a hybrid ground-source heat pump with parallel and serial configurations

Honghee Park, Joo Seoung Lee, Wonuk Kim, Yongchan Kim

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)


A hybrid ground-source heat pump (HGSHP) is proposed to overcome the decrease in the performance of a ground-source heat pump (GSHP) at the degraded ground thermal condition. In this study, a performance comparison between the GSHP and the HGSHP with parallel and serial configurations was conducted by varying the leaving fluid temperature (LFT) of the ground heat exchanger (GHEX), the fluid flow rate of the supplemental loop, the mean outdoor bin temperature, and the switching temperature of the hybrid operation. At the LFT of the GHEX of 40 °C, the coefficient of performances (COPs) for the HGSHP with the parallel and serial configurations were 18% and 6% higher than that of the GSHP, respectively. The cooling seasonal performance factors (CSPFs) of the HGSHPs with the parallel and the serial configurations were 6.5% and 2.0% higher, respectively, than that of the GSHP for Daegu city in South Korea.

Original languageEnglish
Pages (from-to)877-884
Number of pages8
JournalApplied Energy
Publication statusPublished - 2013

Bibliographical note

Funding Information:
This research was supported by the Human Resources Development program (No. 20124010203250) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy, the Korean Evaluation Institute of Industrial Technology (No. 10035530) and a Korea University Grant.


  • COP
  • Configuration
  • Cooling seasonal performance factor
  • Ground thermal degradation
  • Heat rejection ratio
  • Hybrid ground-source heat pump

ASJC Scopus subject areas

  • Building and Construction
  • General Energy
  • Mechanical Engineering
  • Management, Monitoring, Policy and Law


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