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2025 Vol.19, Issue 6 Preview Page

Research Article

Energy Benefit of Air-Conditioning System Based on Central Air Source Heat Pump in Office Buildings

사무소 건물의 중앙 열원 공급식 공기열 히트펌프 냉난방 시스템의 에너지 절감 가능성 분석

Soo-Jin Lee1
,
Min-Geon Park2
,
Su-Yeon Hong2
,
Min-Young Choi2
,
Jae-Weon Jeong3*
이 수진1
,
박 민건2
,
홍 수연2
,
최 민영2
,
정 재원3*
1Postdoctoral Researcher, Department of Architectural Engineering, Hanyang University, Seoul, Korea
2M.S. Student, Department of Architectural Engineering, Hanyang University, Seoul, Korea
3Professor, Department of Architectural Engineering, Hanyang University, Seoul, Korea
1한양대학교 건축공학부 박사후연구원
2한양대학교 건축공학부 석사과정
3한양대학교 건축공학부 교수
*Corresponding Author
30 December 2025. pp. 407-415
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Abstract

This study proposes and evaluates an air-conditioning system for office buildings that utilizes a central air-source heat pump (ASHP) to supply heating and cooling water to individual heat pumps. The proposed system aims to overcome the limitations of conventional decentralized air-to-air heat pumps, whose performance varies significantly with outdoor air temperature. To assess its performance, a thermodynamic cycle analysis and annual energy simulation were conducted using TRNSYS 18 and Engineering Equation Solver (EES) program, considering a typical office building model. Results show that the proposed system achieved higher isentropic efficiency for both individual and central heat pumps, with values of approximately 0.66 and 0.80, respectively, due to the reduced compression ratio. The coefficient of performance (COP) of the individual heat pumps in the proposed system improved by about 45% compared to the conventional system, reaching an average COP of 5.77. Moreover, the total annual energy consumption of the proposed system, including the central unit and circulation pumps, was approximately 99.4 MWh, which represents an 18% reduction compared to the reference central system (115.29 MWh). These findings indicate that the proposed central-source integrated ASHP system can significantly enhance overall energy efficiency by stabilizing heat source temperatures and optimizing the operation of distributed heat pumps.

Keywords
Electrification building
Heat pump
Isentropic efficiency
Energy consumption
키워드
전기화건물
히트펌프
등엔트로피 효율
에너지 사용량
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Information
  • Publisher :Korean Institute of Architectural Sustainable Environment and Building Systems
  • Publisher(Ko) :한국건축친환경설비학회
  • Journal Title :Journal of Korean Institute of Architectural Sustainable Environment and Building Systems
  • Journal Title(Ko) :한국건축친환경설비학회논문집
  • Volume : 19
  • No :6
  • Pages :407-415
  • Received Date : 2025-11-17
  • Revised Date : 2025-11-25
  • Accepted Date : 2025-11-26
  • DOI :https://doi.org/10.22696/jkiaebs.20250035
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