Comparative heating performance evaluation of hybrid ground-source heat pumps using serial and parallel configurations with the application of ground heat exchanger

Minwoo Lee, Dowon Cha, Sungho Yun, Seok Mann Yoon, Yongchan Kim

Research output: Contribution to journalArticlepeer-review

Abstract

Hybrid ground-source heat pumps (HGSHPs) were introduced to prevent performance degradation under thermal imbalance between heating and cooling loads. However, the performance of an HGSHP with a parallel configuration has been rarely investigated in heating-dominated areas. In this study, the heating performances of HGSHPs with serial and parallel configurations are analyzed experimentally by varying the entering secondary fluid temperature (EFT) and flow rate of the supplementary heat exchanger as well as the ground temperature. Compared with the serial configuration, the parallel configuration demonstrates a 16.3% greater heating capacity and 12.6% higher coefficient of performance at an optimal flow rate of 10 LPM with an EFT and ground temperature of 19 °C and 14 °C, respectively. Moreover, for EFTs less than 22 °C, the parallel configuration demonstrates a reduced heat extraction rate from the ground as well as a higher exergy efficiency. Overall, the parallel configuration exhibits superior heating performance, even under severe ground thermal conditions.

Original languageEnglish
Article number113743
JournalEnergy Conversion and Management
Volume229
DOIs
Publication statusPublished - 2021 Feb 1

Keywords

  • Ground thermal imbalance
  • Heating performance
  • Hybrid ground-source heat pump
  • Parallel configuration
  • Serial configuration

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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