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초고층 공동주택 외기전담 시스템 기반 중앙 공급식 환기시스템의 적정 급기조건 설정
김민휘(Kim Min-Hwi),김진효(Kim Jin-Hyo),권오현(Kwon Oh-Hyun),정재원(Jeong Jae-Weon) 한국태양에너지학회 2009 한국태양에너지학회 학술대회논문집 Vol.2009 No.11월
The main thrust of this paper is to investigate acceptable supply air conditions of a dedicated outdoor air system (DOAS) for highrise apartment buildings. As for a typical 132-㎡ apartment unit, it was assumed that centralized DOAS-Ceiling Radiant Cooling Panel was installed. Transient behavior and control characteristics of each system were modeled numerically using a commercial equation solver program. The optimized dew point temperature of the DOAS was discussed on the basis of the ASHRAE standard 62.1-2007 and the current Korean ventilation standard for apartments. It was found that the optimized dew point temperature of the DOAS supply air accommodating total latent load of a space is 11-12℃ and the appropriate supply air temperature of the DOAS is 11-12℃ in cooling period and neutral temperature of 18-20℃ in intermediate period.
외기전담시스템의 병원건물에 대한 적용성 및 냉난방 에너지 절감 효과에 관한 연구
김민휘(Kim Min-Hwi),김진효(Kim Jin-Hyo),권오현(Kwon Oh-Hyun),석윤진(Seok Yoon-Jin),정재원(Jeong Jae-Weon) 한국건축친환경설비학회 2009 한국건축친환경설비학회 논문집 Vol.3 No.4
The purpose of this paper is to investigate supply air conditions and energy saving potentials of a dedicated outdoor air system (DOAS) applied to a patient room of health care facilities. The design of HVAC systems for healthcare facilities is a specialized field of engineering. Based on the current health care facilities design satandards, it was assumed that four 25.8m2 unit patient rooms are served by the three different HVAC systems; a constant air volume system(CAV) with fan coil unit(FCU), a variable air volume system (VAV), and a dedicated outdoor air system (DOAS) with fan coil unit (FCU). Control strategies and energy saving potentials of each system were modeled and estimated using the TRNSYS 16 energy simulation program. Annual cooling and heating coil loads and fan energy reduction were calculated. It was found that the DOAS+FCU system can reduce the fan energy consumption over 65% annually compared with the conventional CAV+FCU system. In addition, over 57.5% of annual cooling coil load can be reduced by use of DOAS+FCU system.
대용량 메모리 어레이 시뮬레이션을 위한 양극성 저항 변화 메모리 회로 모델링
김민휘(Min-Hwi Kim),정성헌(Sunghun Jung),김성준(Sungjun Kim),박병국(Byung-Gook Park) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
In this paper, a circuit model of the filamentary-type resistive memory cell was proposed for RRAM array circuit simulations. DC characteristics are fitted for fabricated and measured RRAM devices by optimizing three resistor elements. Transient characteristics of the model have been investigated. It was found that switching characteristics can be improved by minimizing the parasitic capacitances. For different materials and conduction mechanisms, the characteristics of resistive memories can be fitted simply by controlling several parameters.
김민휘(Kim Min-Hwi),임희원(Lim Hee-Won),신우철(Shin U-Cheul),김효중(Kim Hyo-Jung),김현기(Kim Hyun-Ki),김종규(Kim Jong-Kyu) 한국태양에너지학회 2018 한국태양에너지학회 논문집 Vol.38 No.2
South Korea aims to shift the 20 percent of electricity supplement from the fossil fuel including the nuclear to renewable energy systems by 2030. In order to realize this agenda in the buildings, the plus energy house is necessary to increase the renewable energy supplement beyond the zero energy house. This paper suggested KePSH (KIER Energy-Plus Solar House) and energy performance of house and renewable energy systems was investigated. The KePSH has the target of generating 40% surplus energy than the conventional house energy consumption. The plus energy house is the house that generates surplus energy from the renewable energy sources than that consumes. In order to minimize the cooling and heating load of the house, the shape design and passive parameters design were conducted. Based on the experimental data of the plug load in the typical house, the total energy consumption of the house was estimated. This paper also suggested renewable energy sources integrated HVAC system using air-source heat pump system. Two cases of renewable energy system integration methods were suggested, and energy performance of the cases was investigated using TRNSYS 17 program. The results showed that the BIPV (building integrated photovoltaic) system (i.e., CASE 1) and BIPV and BIST system (i.e., CASE 2) shows 42% and 29% of plus energy rate, respectivey. Also, CASE 1 can generate 59% more surplus energy compared with the CASE 2 under the same installation area.