Study on hybrid ground-coupled heat pump systems

Man Yi, Hongxing Yang, Fang Zhaohong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

92 Citations (Scopus)


Although ground-coupled heat pump (GCHP) systems are becoming attractive air-conditioning systems in some regions, the significant drawback for their wider application is the high initial cost. Besides, more energy is rejected into ground by the GCHP system installed in cooling-dominated buildings than the energy extracted from ground on an annual basis and this imbalance can result in the degradation of system performance. One of the available options that can resolve these problems is to apply the hybrid ground-coupled heat pump (HGCHP) systems, with supplemental heat rejecters for rejecting extra thermal energy when they are installed in cooling-dominated buildings. This paper presents a practical hourly simulation model of the HGCHP system by modeling the heat transfer of its main components. The computer program developed on this hourly simulation model can be used to calculate the operating data of the HGCHP system according to the building load. The design methods and running control strategies of the HGCHP system for a sample building are investigated. The simulation results show that proper HGCHP system can effectively reduce both the initial cost and the operating cost of an air-conditioning system compared with the traditional GCHP system used in cooling-dominated buildings.
Original languageEnglish
Pages (from-to)2028-2036
Number of pages9
JournalEnergy and Buildings
Issue number11
Publication statusPublished - 7 Jul 2008


  • Ground heat exchanger
  • Heat pump
  • Hybrid ground-coupled heat pump systems
  • Initial and operating cost
  • Simulation model
  • Supplemental heat rejecter

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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