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발전소 온배수 열회수를 위한 열교환기의 파울링 특성 및 예측
허재혁(Jaehyeok Heo),이동원(Dong Won Lee),김민휘(Min Hwi Kim),윤린(Rin Yun) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
Available heating energy from Domestic power plant effluent is about 465,182 Tcal, but only a few is used for fishing culture and agriculture and mostly release to the sea. Recently, the power plant heat effluent was included in new and renewable energy in Korea, and the rapid growth of the related research and market are expected. For efficient usage of heat effluent, sea water fouling is a important factor to overcome. In this research, general fouling characteristics in a heat exchanger were investigated and the performance degradation by sea water fouling was estimated.
가스 인젝션 난방사이클에서 시스템 운전조건의 변화가 최적충전량 형성에 미치는 영향
허재혁(Jaehyeok Heo),정민우(Min Woo Jeong),김보성(Bosung Kim),이선일(Sunil Lee),김용찬(Yongchan Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
For heat pumps used in the cold region, it is very important to obtain appropriate heating capacity. Gas injection technique has been proved as an effective method to enhance heating capacity of a heat pump operated in cold climate. Several control devices should be implemented into the gas injection cycle due to a wide operating range of the system. In this study, a gas/liquid separator was used to inject vapor refrigerant into the twin rotary type compressor. In addition, two EEVs and an injection valve were installed to control the refrigerant flow rates in the main and injection loops. Although the gas injection cycle operates at various operating conditions, refrigerant charge amount should be fixed. Therefore, it is very important to investigate the effects of operating conditions on the optimal refrigerant charge of the gas injection cycle. In the present tests, the heating performance of the gas injection cycle was measured by varying refrigerant charge amount, EEV opening, and compressor frequency at the standard heating condition. The optimal refrigerant charge was very sensitive with openings of the first and second EEVs. On the other hand, the optimal refrigerant charge was not dependent on compressor frequency.