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GHP/EHP 하이브리드 시스템에서 최적운전 조건 결정을 위한 연간 에너지사용 비용 시뮬레이션 연구
황일남(Ilnham HWANG) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6
This study evaluates several operation logics of hybrid GHP(Gas engine Heat Pump) by calculating yearly energy cost based on a specific hybrid GHP system compared with EHP(Electric Heat Pump) system having equivalent capacity. The maximum energy cost saving of gas and electricity was 17.9% and it was achieved when the hybrid GHP has the operation logic where EHP only operates under 40% load demand and both of EHP and GHP operate above 40% load demand except GHP running under -5℃. Main factor of energy cost saving is decreased amount of basic electricity fee by reducing peak power consumption of EHP side. Saving differences between several logics were less than 3% and these differences will change if weather condition or energy cost changes.
수랭식 VRF시스템에서 변유량 방식 냉각수 유량제어와 정유량 제어 방식간의 냉방 전기 소비량의 시뮬레이션 비교
황일남(Ilnham Hwang),남현진(Hyunjin Nam),강윤태(Youn Tai Kang),권민호(Minho Kwon) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
This sudy compares electricity consumptions of a water-cooled VRF system during cooling season between the constant condensing water flow control and the variable water flow control by the simplified simulation considering variation of the heat rejection at the dry cooler according to the weather data representing 6 cities. The average accumulative electricity amount of 6 cities in the variable water flow control type water-cooled VRF is 11% smaller than the value in the constant water flow type. In the variable water flow control type, the total compressor power consumption in the variable water flow is 1.1% higher than in the constant water flow type. However, the variable water pump showed 57.1% lower electricity consumption totally than the constant water flow type.
데이터센터 냉방 시스템 공랭식 VRF와 수냉식 칠러 열원별 에너지 사용량 시뮬레이션 비교 연구
금기정(Kijung Keum),강윤태(Yountai Kang),황일남(Ilnham Hwang),이재용(Jaeyong Lee),유태진(Taejin Yu) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
As the inverter technology of air-cooled VRF system is developing, the VRF system’s efficiency is improving. The Refrigerant circulating the VRF system can make use of the latent heat, so compared to the coolant of the chiller, the density of the transmitted energy to unit mass is low, and can reduce the conveyance power. Therefore, the VRF system can be the high efficiency system datacenters need. The energy simulation analysis of the air cooled VRF system and the water-cooled chiller system consumes around 9.1% less energy due to its higher efficiency at low partial load conditions.