| Title |
Experimental Study on the Performance Improvement of a Simultaneous Heating and Cooling Heat Pump in the Heating-main Operating Mode |
| Authors |
강훈(Hoon Kang) ; 정현준(Hyenjoon Jung) ; 주영주(Youngju Joo) ; 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 high efficiency of wall insulation. Hence, the development of a multi-heat pump that can cover heating and cooling simultaneously for each indoor unit is required. In this study, the operating characteristics and performance of a simultaneous heating and cooling heat pump in the heating-main operating mode were investigated experimentally. The system adopted a variable speed compressor with four indoor units and one outdoor unit with R-410A. In the heating-main mode, the cooling capacity was lower than the design cooling capacity due to the reduction of the flow rate in the indoor unit for the cooling, with the increase of the heating capacity. To solve these problems, the performance characteristics of the simultaneous heating and cooling heat pump in the heating-main mode were investigated by varying the flow rate to the indoor unit for the cooling and the compressor rotating speed. In addition, the adequate control methods were suggested to improve the system efficiency. |