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위명환,김성오,어재혁,김진환 한국공업화학회 2005 응용화학 Vol.9 No.1
A Na-CO₂ heat exchanger is one of the key equipments in the concept of coupling the supercritical CO₂ Brayton cycle to the KALIMER-150 design. The exchanger is a shell and tube counter flow type with a hot sodium on the shell side and a supercritical carbon dioxide on tube side. In this study, a computational design methodology was developed and the sensitivity study was done on the major design parameters for the development of preliminary design. In the designing process, the design requirements are pressure drops and sodium maximum velocity in the shell side and aspect ratio of the heat exchanger. The evaluation revealed that the gap design of doubel wall tube has noticeable effects on the thermal-hydraulic characteristics of the heat changer. Maintaining the operating condition to be identical to those of KALIMER-150, the heat transfer area of He packed case was 4 times more than that of LBE packed case.
위명환,김성오,전원대,어재혁,김진환 한국공업화학회 2004 응용화학 Vol.8 No.2
The DWTSG concept is proposed as a advanced steam generator of liquid metal reactor to avoid sodium-water reaction incidents in the SG. The optimization of steam generator from economic viewpoint is to minimize the total cost of heat transfer area and pumping power. The baffles are primarily used in shell and tube steam generator for inducing cross flow over tube bundles, and as a results, improving heat transfer performance. In this paper a computer based design method, which covers segmentally baffled steam generator is developed for preliminary DWTSG design. And parametric sensitivity studies are done to determine required heat transfer area to meet the specified heat capacity by calculating minimum or allowable shell-side pressure loss.
景福宮 興福殿 圈域의 發掘調査結果와 『北闕圖形』ㆍ『景福宮配置圖』의 比較ㆍ檢討
오동선,김태민,위명환,이윤혜 한국전통문화대학교 한국전통문화연구소 2013 한국전통문화연구 Vol.12 No.-
본고는 경복궁 흥복전 권역 발굴조사결과와 해당 권역의 사료와 도설(『북궐도형』ㆍ『경복 궁배치도』)을 비교ㆍ검토하여 향후 해당 권역 건물의 정비ㆍ복원시 고려해야할 점들을 제시하는데 목적이 있다. 경복궁 흥복전 권역은 침전권역과 향원정 사이의 공간으로 경복궁 의 중심 축선상에 위치한다. 관련 기사는 고종연간 흥선대원군의 경복궁 중건(1867년)이 후 부터『조선왕조실록』,『승정원일기』,『일성록』등에서 확인되는데, 주로 왕의 편전으로 서 외국사신 접견,신하 접견,경연 등의 장소로 이용되었다. 조사결과 일제강점기 왜식정원 조성으로 인해 크게 파괴된 흥복전 주전각을 비롯하 여 사료와 도설에 설명된 건물 대부분의 기초시설이 확인되었다. 조사결과와 사료ㆍ도설을 비교했을 때 『북궐도형』에‘今無’로 표기된 건물의 경우 『북궐도형』보다는 『경복궁배치 도』와 더 유사하고, 나머지 건물은 북궐도형과 유사한 양상으로 확인된다. 이외 흥복전 권역 복원을 위한 건물 내외부와 건물 간의 해발고도 차이, 구지형과 이와 관련된 세부적인 축조과정,지하에 시설된 암거형 배수로와 배수 체계,건물 내부의 난방시설(고래, 아궁이), 건물 외부의 굴뚝과 계단기초시설, 담장유구가 확인되었다. Purpose of this paper is suggesting consideration point of comparision with result of excavacation Gyeongbokgung Palace Heungbokjeon area and BukkwoldohyongㆍGyeongbokgung-Bachido to restoration of this area. Gyeongbokgung Palace Heungbokjeon area is located between Chimjeon area and Hyangwonjeong district. And this position is in a direct middle line of Gyeongbokgung Palace from south to north area. During the Gojong year after rebuilding Gyeongbokgung palace by Heungseondaewongun(1867), there were many involved article about Heungbokjeon area in historical material; the Annals of the Joseon Dynasty, the daily records of royal secretariat of Joseon Dynasty, Ilseongnok, etc. The main uses of building is not only the king's private quarters but also visiting area for the foreign minister and the center of performances. As a result of excavation, we checked the most part of the structure-foundation explained by historical materials and illustration included Heungbokjeon main palace which were destroyed the greater part of the area by Japanese style garden. Comparing excavation result with historical materials and illustrations, the area signed‘Geum-moo(Not exist)’is similar with Gyeongbokgung-Bachido and other part of the building is suitable for Bukkwoldohyong. In addition to comparison result, we verified elevation differences between inside and outside of the building, and past topography involved detail process of constructing, underdrain and drainage system. Besides we investigated inside of the building; heating and cooking facility like Korean hypocaust and fireplace as well as outside of the building; chimney, foundation of stairs and walls.