Experimental study on the performance of a simultaneous heating and cooling multi-heat pump with the variation of operation mode

Hoon Kang, Youngju Joo, Hyunjoon Chung, Yong Chan Kim, Jongmin Choi

Research output: Contribution to journalArticle

15 Citations (Scopus)


The cooling load in the winter season becomes significant in commercial buildings and hotels because of the wide usage of office equipment and improved wall insulation. In this study, a simultaneous heating and cooling multi-heat pump having four indoor units and an outdoor unit was designed and tested in five operation modes: cooling-only, heating-only, cooling-main, heating-main, and entire heat recovery. The performance of the system with R410a was optimized by adjusting the system's control parameters. In the cooling-main mode, the rate of the bypass flow to the heating-operated indoor unit was optimized by controlling the EEV opening of the outdoor unit. In the heating-main mode, the mass flow rate to the cooling-operated indoor unit was optimized by adjusting the EEV opening in the outdoor unit. In the entire heat recovery mode, the compressor speed was controlled to improve the system COP with appropriate heating and cooling capacities.

Original languageEnglish
Pages (from-to)1452-1459
Number of pages8
JournalInternational Journal of Refrigeration
Issue number6
Publication statusPublished - 2009 Sep 1



  • Chauffage
  • Compresseur
  • Compressor
  • Cooling
  • Détendeur électronique
  • Electronic expansion valve
  • Expérimentation
  • Experiment
  • Heat pump
  • Heating
  • Optimisation
  • Optimization
  • Pompe à chaleur
  • R410A
  • Réfrigération
  • Variable speed
  • Vitesse variable

ASJC Scopus subject areas

  • Mechanical Engineering
  • Building and Construction

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