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유병호,Yu, Byeong-Ho 한국과학기술단체총연합회 2002 과학과 기술 Vol.35 No.3
세계는 지금 전선없는 과학기술 전쟁을 하고 있는 느낌이다. 이러한 무한 경쟁시대에 우리나라 과학기술의 질을 높이기 위해선 우리 생활 저변에 과학을 사랑하는 열린 마음으로 과학문화운동이 이뤄져야 할 것이다.
국내 기상조건하 주거용 건물 가스 보일러의 부분부하 특성과 에너지 사용량 분석
유병호(Byeong Ho Yu),서병모(Byeong-Mo Seo),문진우(Jin-Woo Moon),이광호(Kwang Ho Lee) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.9
Residential buildings account for a significant portion of the total building-energy usage in Korea, and a variety of research studies on the domestic boiler have therefore been carried out; however, most of these studies examined the boiler itself, whereby the part-load ratio characteristics and the corresponding gas-energy consumption patterns were not analyzed. In this study, the part-load ratio and operating characteristics of a domestic gas boiler were analyzed within a residential building equipped with a radiant floor-heating system; in addition, the energy consumption between condensing and conventional boilers was comparatively analyzed. Our results show that significant portions of the total operating hours, heating load, and energy consumption are in the part-load ratio range of 0 through 40%, whereby the energy consumption was significantly affected by the boiler efficiency under low part-load conditions. These results indicate that the part-load operation of a boiler is an important factor in residential buildings; furthermore, replacing a conventional boiler with a condensing boiler can reduce annual gas-energy usage by more than 20%.
사무소 건물에서 냉동기의 부분부하율 및 냉방 에너지 성능 특성 분석
서병모(Byeong-Mo Seo),유병호(Byeong-Ho Yu),이광호(Kwang-Ho Lee) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.11
Commercial buildings account for significant portions of the total building energy in Korea, and thus, a variety of research on chiller operation has been carried out. However, most of the studies were carried out on the chiller itself, i.e., the part load ratio characteristics and the corresponding electricity energy consumption patterns were not analyzed in existing studies. In this study, the part load ratio and the operating characteristics of the vapor compression chiller were analyzed within an office building equipped with the conventional variable air volume system. As a result, significant portions of total operating hours, cooling load, and energy consumption turned out to be in the part load ratio range of 0 through 50%. Thus, energy consumption was significantly affected by the chiller COP at low part load conditions, indicating that chiller operation at the part load is an important factor in commercial buildings.
CFD를 활용한 바닥공조시스템 디퓨저의 성층화 모델 예측
손정은(Jeong-Eun Son),유병호(Byeong-Ho Yu),방승기(Seung-Ki Pang),이광호(Kwang Ho Lee) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.3
Underfloor air distribution (UFAD) is an air distribution strategy for providing ventilation and space conditioning in buildings. UFAD systems use the underfloor plenum beneath a raised access floor to provide conditioned air through floor diffusers that create a vertical thermal stratification during cooling operations. Thermal stratification has significant effects on energy, indoor air quality, and thermal comfort performance. The purpose of this study was to characterize the influence of a linear bar grille diffuser on thermal stratification in both interior and perimeter zones by developing Gamma-Phi based prediction models. Forty-eight simulations were carried out using a Computational Fluid Dynamics (CFD) technique. The number of diffusers, the air flow supply, internal heat gains, and solar radiations varied among the different cases. Models to predict temperature stratification for the tested linear bar grille diffuser have been developed, which can be directly implemented into dynamic whole-building simulation software such as EnergyPlus.
손정은(Jeong-Eun Son),유병호(Byeong-Ho Yu),김홍욱(Hong-Wook Kim),이광호(Kwang Ho Lee) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
Properly controlled UFAD systems under cooling operation produce thermal stratification exhausting the conditioned-air supplied from floor diffuser to the return plenum after removing the heat load of occupied zone. Thermal stratification is one of the important features of UFAD systems; it eliminates the necessity to consider heat from convection that occur in areas other than lower occupied zone. Hence, the system is more energy effective compared to conventional overhead systems that presume the entire space as an air conditioning space. Thus, enhancing the thermal stratification is necessary for the UFAD systems performance. In this study, we assess the UFAD energy performance by considering the thermal stratification as an input variable through the EnergyPlus simulation. As a result, enhancing thermal stratification improves the cooling energy saving potential by more than 15% as expected. On the other hand, the reduction of thermal stratification causes the increase in supply air volume so that air conditioning of occupied zone as well as upper mixed zone is needed.
바닥공조 시스템에서 슬래브의 단열재 설치에 따른 바닥공간 온도상승 및 에너지 사용량 변화
권혁주(Hyuk-Ju Kwon),연상훈(Sang-Hun Yeon),유병호(Byeong-Ho Yu),이광호(Kwang Ho Lee) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
Generally, the UFAD (Under Floor Air Distribution) system used in office buildings, as compared with the CBAD (Ceiling Based Air Distribution) system, have many advantages such as reduced floor height as well as the improvement of the indoor air quality. Moreover, UFAD has great potentials to possibly save energy by conditioning only occupied zone due to stratification. However, the thermal decay which is defined as the increase of the supply air temperature in the supply plenum can adversely affect the energy performance. Therefore, this study, by installing insulations in the slab to reduce thermal decay and enhance cooling performance, analyzed the potential of the cooling energy performance improvement using the EnergyPlus simulation. As a result, thermal decay was reduced when installing insulation on the slab, but the cooling load of the interior zone increased. Nevertheless, the building was able to slightly reduce the total cooling energy. The results indicate that impact of cooling load change in supply plenum is larger than that in occupied zone.