Performance improvement of solar-assisted ground-source heat pumps with parallelly connected heat sources in heating-dominated areas

Minwoo Lee, Dongchan Lee, Myeong Hyeon Park, Yong Tae Kang, Yongchan Kim

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


Solar-assisted ground-source heat pumps (SGSHPs) with a serial configuration have been introduced to reduce the performance degradation of ground-source heat pumps (GSHPs) for their long-term operation. However, SGSHPs with parallel configurations have rarely been investigated in heating-dominated areas. In this study, the heating performances of a GSHP and SGSHPs with serial and parallel configurations in a heating-dominated building are analyzed using TRNSYS and compared for 20 years by varying the borehole length and solar collector area. With a borehole length of 120 m and solar collector area of 10 m2, an SGSHP with a serial configuration showed a 12.6 and 11.5% higher ground temperature and solar collector efficiency, respectively, than the parallel configuration owing to the solar heat injection into the ground. However, an SGSHP with a parallel configuration decreased the energy consumption by 19.6 and 13.8% compared to those for the GSHP and SGSHP with a serial configuration, respectively, owing to an improved heating capacity. Furthermore, an SGSHP with a parallel configuration can considerably decrease initial costs by reducing the borehole length.

Original languageEnglish
Article number122807
Publication statusPublished - 2022 Feb 1

Bibliographical note

Funding Information:
This work is supported by the Korea Agency for Infrastructure Technology Advancement( KAIA ) grant funded by the Ministry of Land, Infrastructure and Transport (Grant 20HSCT-B157909-02 ).

Publisher Copyright:
© 2021 Elsevier Ltd


  • Heating-dominated areas
  • Parallel configuration
  • Serial configuration
  • Solar-assisted ground-source heat pump

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Modelling and Simulation
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Pollution
  • General Energy
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Management, Monitoring, Policy and Law
  • Electrical and Electronic Engineering


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