| Title |
Experimental Study on the Performance Improvement of a Simultaneous Heating and Cooling Heat Pump in the Cooling-main Operating Mode |
| Authors |
정현준(Hyun Joon Chung) ; 주영주(Youngju Joo) ; 강훈(Hoon Kang) ; 김용찬(Yongchan Kim) ; 최종민(Jongmin Choi) |
| Keywords |
동시냉난방 ; 열펌프 ; 열회수 ; 운전모드 Simultaneous heating and cooling ; Heat pump ; Heat recovery ; Operating mode |
| Abstract |
The cooling load in winter is significant in buildings and hotels because of the usage of office equipments and the improved wall insulation. Hence, a multi-heat pump is required to cover heating and cooling simultaneously for each indoor unit. In this study, the operating characteristics and performance of a simultaneous heating and cooling heat pump in the cooling-main operating mode were investigated experimentally.The system adopted a variable speed compressor using R410A with four indoor units and one outdoor unit. In the cooling-main mode, the heating capacity decreased due to reduction of flow rate to the indoor unit under heating mode operation. The EEV opening was adjusted to increase flow rate to the indoor unit under heating mode operation. The total capacity and COP in the cooling-main mode increased by 20.5% and 29.2%, respectively, compared with those in the cooling-only mode |