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배흥희(Heung hee Bae),이상헌(Sanghun Lee),김병순(Byengsoon Kim) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
The present study has been conducted control logic of a new freeze protection for a water source VRF system. The freeze of PHE(Plate Heat Exchanger) is related with low temperature and the volume of circulating refrigerant. In this study, the suggested method is based on the volume of refrigerant and ratio of operating indoor units. As a result, it is observed that there is no freeze in a PHE while a water source VRF heat pump system is operated in the suspension or low volume of water supply without gate valve..
수열원 냉난방 동시형 히트펌프 시스템의 실외 열교환기 유량제어를 통한 성능개선에 관한 연구
배흥희(Heung Hee Bae),이동혁(Dong Hyuk Lee),이상헌(Sanghun Lee),김병순(Byengsoon Kim),안영철(Young Chull Ahn) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.3
The present study has conducted cycle design and control technology of a water source VRF heat pump system. Previously, study of a simultaneous heating and cooling in an air source VRF heat pump system has been conducted. However, performance data and design methods for simultaneous heating and cooling in a water source VRF heat pump system are limited in the literature, due to various system parameters and operating conditions. In this study, the operating characteristics and performances of a simultaneous heating and cooling heat pump system are carried out, in simultaneous operation modes. Control logics of an EEV are developed for flow rate control to the outdoor unit, and are verified. When the control logics are applied, the simultaneous cooling and heating performances are sufficiently achieved, and system COPs are increased by up to 23.4%.