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냉각수 급수온도에 따른 직팽식 AHU-수랭식 VRF 민감도 분석
연상훈(Sang Hun Yeon),이제헌(Je Hveon Lee),문진우(Jin Woo Moon),이광호(Kwang Ho Lee) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
Recently, VRF(Variable Refrigerant Flow) system has been attracting attention in commercial buildings due to its energy efficiency and capability to control characteristics and load of each room. VRF heat pump system can be actively controled under part load operation and it is possible to control the flow rate of the refrigerant individually according to the load by connecting a large number of indoor units to a single outdoor unit. This study is to assess a direct expansion (DX) air handling unit (AHU)-water source VRF system through co-simulation between EnergyPlus and Matlab and to perform the sensitivity analysis of cooling energy depending on the entering condenser fluid temperature. As a result, when condenser fluid temperature was elevated from 28 ℃ to 34 ℃, there was a tradeoff between outdoor unit energy reduction and cooling tower energy increase and thus the total cooling energy variation was only around 4%.