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상변화 물질 통합 조명기구의 냉방 에너지 저감 효과 분석
임한솔(Hansol Lim),이현화(Hyun Hwa Lee),최경석(Gyeong-Seok Choi),이용준(Yong-Jun Lee),강재식(Jae-Sik Kang) 한국생활환경학회 2021 한국생활환경학회지 Vol.28 No.1
The phase chase material (PCM) integrated lighting fixture is suggested to reduce the heat from lightings in the building by inserting PCM in a cover of lighting. Thereby, the heat from the lightings expects to be absorbed to the PCM during the working time and rejected during the night time without occupants. The thermal performance of PCM integrated lighting fixture has been estimated using Physibel Voltra which provides three-dimensional transient heat transfer analysis. The results shows that it can successfully decrease the surface temperature of lighting about 2℃ and reduce the heating load within averaged 47%. Based on the analyzed results, the detail energy simulation has been performed using theoretical equations and empirical models from the Energyplus to evaluate the energy saving potential of PCM-integrated lighting fixture during the cooling season. The target building is normal office building with the variable air volume (VAV) system for air conditioning and ventilation. As results, the 5.8% of energy savings is expected from the chiller, pump and fan by using PCM-integrated lighting fixture. In addition, it can be expected that if the heating loads from lightings could be more decreased up to 10% by improving heat transfers of PCM layers, the energy consumption could be saved maximum 13.2% during the cooling season.
고온공기 공급에 따른 액체연료의 연소특성에 관한 실험적 연구
강재호,임인권 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-
An experiment on the combustion characteristics of pre-heated air combustion with oil fuel is performed. With the high-temperature air supply, although real air flow rates are less than that of stoichiometric condition, stable distribution of high-temperature combustion region is obtained with increase of flame intensity. The flame temperature with pre-heated air is much higher than reference where the air is not pre-heated. When pre-heated air is introduced in the chamber, the temperature distribution in the chamber is more uniform in a high level. CO emission is decreased, but NOx emission is increased compared to the flame in a reference, although the amount is small. It is found that with the use of pre-heated air, the flame intensity and combustion region can be extended due to increase of the combustion intensity and the air flow velocity.