Comparison of Actual Building Energy Consumption with Simulated Building Energy Consumption and Economic Analysis between VRF ASHP and GSHP

VRF ASHP시스템의 실제 건물에너지 사용량과 시뮬레이션 비교분석 및 GSHP 적용시 경제성 분석에 관한 연구

  • Park, Doo-Yong ;
  • Kim, Kang-Soo
  • 박두용 ;
  • 김강수
  • Received : 2013.08.23
  • Accepted : 2014.01.20
  • Published : 2014.02.28


Variable refrigerant flow(VRF) refers to the ability of the system to control the amount of refrigerant flowing to the multiple evaporators (indoor units). This study compares analysis of the actual energy usage of a building with VRF ASHP and the simulation results on EnergyPlus. Also, this study aims to verify the energy savings when VRF ASHP system is replaced with the GSHP system. The actual value of the energy consumption and EnergyPlus simulation results both satisfied ASHRAE standards with MBE = 6.7% and Cv(RMSE) = 9.8%. When VRF ASHP system was replaced with the GSHP system, the total secondary energy consumption was estimated to be saved by 25.0%. Also, GSHP system, compared with VRF ASHP system, does not guarantee economical benefit even when we consider the cost of 25 years of equipment life cycle. If 50% of initial installation cost for the GSHP system is supported, the payback period will be 8 years. Also, if policies that support the cost of the initial installation is implemented, life cycle cost will be improved.


Variable Refrigerant Flow Air source heat pump(VRF ASHP);Ground source heat pump(GSHP);EnergyPlus


  1. 박두용, 윤갑천, 김강수, EnergyPlus와 eQUEST를 이용한 공동주택의 난방에너지소비량 비교분석에 관한 연구, 한국태양에너지학회 33권1호 2013.2
  2. 김동균, 전종욱, 김강수, EnergyPlus의 시뮬레이션 결과와 실제 냉방에너지 사용량의 비교 분석 및 GHP와 EHP의 에너지 성능비교에 관한 연구, 대한건축학회 27권5호 2011.5
  3. Xiaobing Liu, Tianzhen Hong, Comparison of energy efficiency between variable refrigerant flow systems and ground source heat pump systems, Energy and Buildings, 2010
  4. Laeun Kwon, Field performance measurements of a ASHP system with sub-cooler in educational offices for the cooling season, Energy and Buildings, 2012
  5. United Satates Department of Energy, Energy Plus Manual Engineering Reference, Version 3.0
  6. Eskilson, P.,Thermal Analysis of Heat Extraction Boreholes, Ph.D. Thesis, Department of Mathematical Physics, University of Lund, Lund, Sweden, 1987
  7. Yavuzturk, C., J.D. Spitler, A Short Time Step Response Factor Model for Vertical Ground Loop Heat Exchangers, ASHRAE Transactions, 1999
  9. 손병후, 강신형, 단독주택용 지열 열펌프 시스템의 경제성과 이산화탄소 배출저감 가능성 평가, 대한설비공학회 2009 하계 학술발표대회 논문집, p.p. 0064-0069
  10. M&V Guidelines : Measurement and Verification for Federal Energy Projects Version 3.0, U.S. Department of Energy

Cited by

  1. Model-based multi-objective optimal control of a VRF (variable refrigerant flow) combined system with DOAS (dedicated outdoor air system) using genetic algorithm under heating conditions vol.107, 2016,