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송성훈 ( Song Seong-hoon ),서동현 ( Seo Dong-hyun ) 충북대학교 건설기술연구소 2018 建設技術論文集 Vol.37 No.2
Construction of curtain-wall buildings are growing in south Korea due to various demands from building owners. Nowadays, however, government has realized that this kind of buildings cause imbalance of indoor environment in terms of visual and thermal aspects. In 2015, Korean government implemented a code for mandatory exterior shade design on some public building so it is expected such a design practice will be popular. In this research, detailed building energy simulation tool, Energyplus, is used to predict artificial lighting energy saving potential when venetian blind is applied for a unit space. To calibrate daylight impact on the building model, actual daylight performance is measured for a day with hourly interval. The calibrated space model showed good agreement after some modification of input, and then lighting energy savings are simulated with respect to slat angle. The result showed that above 50 degrees of slat angle, lighting energy saving is limited because of abundant indoor luminance. To find appropriate slat control criteria of exterior luminance, vertical beam irradiance was used which usually 200 W/㎡ is common. Between 150~300 W/㎡ with 25 W/㎡ interval, every 5 degrees slat angle are tested. The 126 times of simulation result showed that in lower slat angle range (0~30 degree), limit of the beam irradiance showed larger saving with larger irradiance, however, in above 50 degrees, no significant saving was found between the irradiance range due to already enough indoor luminance.
오준성 ( Joon-seong Oh ),김성대 ( Sung-dae Kim ),최재훈 ( Jae-hun Choy ),송성훈 ( Seong-hoon Song ),문태화 ( Tae-hwa Mon ),이선희 ( Seon-hui Lee ) 한국환경기술학회 2012 한국환경기술학회지 Vol.13 No.1
음식폐기물로부터 연중 고농도의 CH<sub>4</sub>을 함유하는 바이오가스를 발생시키기 위하여 L×W×H=900×2,000×2,100(mm) 규격의 건식혐기분해가스화실을 제작하였으며 수분량을 낮추기 위한 수분조절제 등을 혼합시켜 건식혐기분해가스화실험을 수행하였다. 8개의 건식혐기분해가스화실에 8일 간격으로 음식폐기물을 투입하여 각각 64일간 체류시키므로서 5개의 건식혐기분해가스화실에서 연중 CH<sub>4</sub>농도 50%이상과 가스발생량 1㎥/㎥·d(혼합음식폐기물 1㎥에서 바이오가스발생량 1㎥/d)이상을 유지하는 건식혐기분해가스화실은 5개실로 조사되었다. In order to produce biogas from domestic food waste were installed dry anaerobic digestion chambers of the size L×W×H=900×2,000×2,100(mm). High moisture of the food waste was reduced with mixing of dry biodegradable matters and the mixed food waste was digested at the keeping temperature 30℃, 40℃ and 50℃ in the chambers. The following result were obtained for year-round biogas production from the food waste : ○ The 3 biodegradable matters : dry dead leaves, rice chaff and wood sawdust were suitable as a moisture reducing matter of domestic food waste. ○ The highest CH<sub>4</sub> concentration 58% of biogas was measured each after 40 and 52 storage days at keeping temperature 50℃ and 40℃. ○ Under the operating condition of keeping temperature 40℃ and storage time 64 days was obtained the year-round CH<sub>4</sub> concentration over 50% and biogas volume over 1㎥/d from mixed food waste 1㎥ at the 5 chambers of 8 dry anaerobic digestion chambers.
NiAl/Ni₃Al 2상 합금의 상변태 및 미세조직에 미치는 제3원소 첨가효과
송성훈,김수현,오명훈,위당문 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.12
The microstructural evolution of b-NiAl/γ' -Ni3Al two-phase (Ni_(66)Al_(34))_(100-x)X_(X)(X=Ti, Si, Nb) alloys during various heat treatment (quenching and aging) were systematically studied. It was found that the microstructural features of the two-phase NiAl/Ni₃Al alloys could be divided into three types : lamellar, mesh and Widmansttten microstructures. The reason why those three types of microstructure were formed could be explained by the change of austenite start temperature(As temperature) depending on the ternary elements. In case of As>250℃, the lamellar microstructure was formed by following phase transformation: Martensite→Ni5Al3→β+γ' . In this case, the NiAl martensite was quickly transformed into the Ni5Al3 phase at 250℃ by a re-ordering reaction. In case of 20℃ <A_(s)<250℃, two types of mesh microstructure were formed depending on the ternary element. When Ti and Nb were added as a ternary element, the β→Ni_(5)Al3 transformation occurred very quickly, but not in the case of Si addition. Hence, the final mesh microstructures showed somewhat different microstructural features. On the other hand, in case of A_(s)<20℃, the direct β→β+γ' transformation occurred because the martensitic transformation could not occur due to its very low M_(s) temperature, resulting in the Widmanstatten type microstructure.