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인젝터 하이브리드 팽창 시스템을 이용한 히트펌프의 성능향상 연구
노철우(Chul Woo Roh),한경호(Kyeongho Han),김민수(Min Soo Kim) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
In this study, we propose an injector-hybrid expansion system (IHES) and its operating control methods in a R410A heat pump system. The use of injector in a heat pump system is the first try in the world. By the injector operation, the mass flow rate of refrigerant in a heat pump system is boosted by 150 % of the mass flow rate in a steady-state operating condition. The temporary increased mass flow rate increases heating and cooling capacity as well as heating and cooling coefficient of performance (COP). Test results show that the heating capacity was increased by about 5% and the heating COP was increased by about 6.2% with using the IHES.
주택면적의 변화에 따른 초소형 연료전지 열병합 시스템의 경제성 분석에 관한 연구
노철우(Chul Woo Roh),김민수(Min Soo Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The fuel cell system is environment-friendly and energy efficient system. Especially, the fuel cell cogeneration systems providing heat and electricity to buildings have been developed and applied to a lot of sites in the world to cope with the global warming and CO₂ emission problem. This paper presents the result of study on the economic evaluation with super-micro fuel cell (SMFC) cogeneration system by varying the floor area (132 ㎡~331 ㎡) of the house, whose system capacity ranges from 0.10 ㎾e to 0.50 ㎾e. The electricity demand, heat demand, and saved energy cost have been simulated for various capacities of fuel cell cogeneration system. As a result, this study suggests the fuel cell system's capacity decision strategy for a given house area. Contrary to conventional design assumptions, the smaller capacity fuel cell cogeneration system is more economical and appropriate for the house of large floor area.
플러그인 하이브리드 전기자동차의 연료 경제성에 관한 연구
노철우(Chul Woo Roh),김민수(Min Soo Kim) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.4
The most concerning issue of these days is the energy crisis caused by increasing threat of dependence on imported oil and volatile market trend. Under these circumstances, the PHEV(plug-in hybrid electric vehicle) is drawing attention for the next generation’s car which could give a chance to decrease the dependence on imported oil and reduce the environmental impact of vehicle. The fueling cost of PHEV, one of the core factor of decision about buying car, should be calculated in the circumstances of Korea to make sure that PHEV has competitive power in real market. The fuel cost saving of PHEV versus CV(conventional vehicle) is simulated and discussed in the condition of increasing gasoline cost, electricity rate, and city-gas rate. In conclusion, the PHEV60-FS shows the best economic feasibility when gasoline price goes up. The PHEV20 has the most stable economic feasibility as electricity rate increases. The fuel cell cogeneration system for RPG could be an alternative for charger of PHEV in the near future.
재생에너지 변동성 완화를 위한 고온 전력저장 시스템의 성능 특성 및 경제성 비교에 관한 연구
노철우(Chulwoo Roh),조준현(Junhyun Cho),신형기(Hyungki Shin),백영진(Young-Jin Baik),이길봉(Gilbong Lee),조종재(Jongjae Cho),이범준(Beomjoon Lee),최봉수(Bongsoo Choi) 대한설비공학회 2019 설비공학 논문집 Vol.31 No.5
Electricity storage is a key aspect in mitigating the volatility of renewable energy in sustainable energy systems. Particularly, a new lasting and cost-effective electricity storage technology with a discharge duration of 10 to 100 hours at rated power is required to support the energy time shift and many other stationary electricity storage applications commonly used on the grid today. A high-temperature electricity storage system requires chemical, thermal and mechanical technical approaches to achieve the long-duration and cost-effective electricity storage. This study presents a schematic of the high-temperature electricity storage system. The analysis of the roundtrip efficiency of the system and the levelized cost of storage (LCOS) is conducted based on the various operating conditions.
Active 기술로서의 초고효율 열펌프 시스템 미래 기술 연구 동향
노철우(Chulwoo Roh),신형기(Hyungki Shin),백영진(Young-jin Baik),이길봉(Gilbong Lee),이범준(beomjoon Lee),조준현(Junhyun Cho),최봉수(Bongsoo Choi),조종재(Jongjae Cho),허균철(Gyunchul Heo) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6
In this study, candidate technologies for maximizing energy efficiency are reviewed when heat pumps are to be applied as technologies to actively reduce the energy consumption in buildings. In order to improve the efficiency of heat pump system compared to various existing technologies, it is necessary to escape from the traditional technology approaches. Electrochemical approaches, methods using radiation other than convection, or non-vapor compression methods through material innovation are being considered worldwide. Industrial research efforts are increasingly intensifying to simultaneously reduce greenhouse gas emissions and satisfying consumer preferences. Especially, this paper focuses on the future technology acquisition strategy of the Korea Institute of Energy Research compared to cases of global research institutes.
PHEV 시장 형성 시 전력망에 미치는 영향 및 최적 충전 제어전략에 관한 연구
노철우(Chul Woo Roh),김민수(Min Soo Kim) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.4
Plug-in hybrid electric vehicle (PHEV) with capability of being recharged from the power-grid will reduce oil consumption. Also, the PHEV will affect the utility operations by adding additional electricity demand for charging. In this research, the power-grid impact by demand of PHEV charging is presented and the optimal charging control strategy for utility operators is proposed with simulated data. The penetration of PHEV is assumed to be 50% in the circumstances of Korean passenger car market and Korean power-grid market limitedly. To obtain smooth load shape and utilize the surplus electricity in power-grid at midnight and dawn, the peak of charging demand should be controlled to be located before 4:00 a.m., and the time slot which can supply the electricity power to PHEV should be allowed between 1:00 a.m.~7:00 a.m.