장배관 및 고낙차를 고려한 멀티형 히트펌프 시스템의 성능특성에 관한 수치적 연구

The performance of a multi-type heap pump system was degraded with the increases of pipe length and head when it was installed in buildings. To investigate the performance of a multi-type heat pump according to pipe length and head, a simulation model containing five modules of a compressor, evaporator, condenser, electronic expansion valve, and pipes was developed in the heating and cooling mode operation. The system was composed of one outdoor unit with a 10 HP compressor, and five indoor units. The maximum length and head of the pipe were 100 m. The simulation results showed that the system capacity was more affected by the pipe head than the length. The pipe length had less effects on the system performance in the cooling mode than that in the heating mode.