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나노유체를 적용한 태양열집열시스템 열전달 성능향상 연구
손지훈(J. H. Son),정정열(J. Y. Jung),이호생(H. S. Lee),김현주(H. J. Kim) 한국해양환경·에너지학회 2013 한국해양환경·에너지학회 학술대회논문집 Vol.2013 No.11
해양온도차발전의 경우 적도 및 아열대 해역에서는 1년 내내 효율이 유지가 되지만, 고위도에서는 하절기와 달리 동절기에는 표층수의 온도가 떨어져 심층수와의 적정온도차를 만족하지 못해 효율이 하락하는 등의 문제점이 발생함으로 인해 동절기에 해양온도차발전 운전시 해양표층수를 대체할 온열원의 공급이 필요하다. 동절기에 해양온도차발전의 온열원 확보를 위해 같은 전력으로도 좀 더 높은 온도의 온열원 공급을 위해 산화알루미늄 나노유체를 태양열집열시스템에 적용하였다. 이에 본 연구에서는 평판형 태양열집열기를 기반으로 하는 태양열집열시스템의 큰 관을 적용하여 실험장치 2개 set를 제작하였고, 실제 태양열의 평균일사량 대비 평판형 태양열집열기의 평균 집열열량을 기준으로 가동을 하여 순수물과 산화알루미늄 나노유체의 비율별 가동실험을 수행하여 열전달 성능을 비교하였다. In case of OTEC, its efficiency is maintained all through the year in tropical and subtropical regions. However in high latitude region, the efficiency of OTEC decreases due to less temperature difference between surface and deep waters in winter while the temperature difference is enough for OTEC in summer. Because the temperature of surface water goes down in winter, an additional heat source is necessary to compensate the energy of surface water to operate OTEC. In this study, solar energy is considered as the additional heat source because it is the most abundant energy resource on earth. Also nanofluid, a colloid with suspended nanoparticles, is used to enhance the heat transfer rate of solar collecting system. Al2O3/water nanofluids were prepared to used as an working fluid for solar collecting system. We installed same two sets of solar collecting system with flat-plate solar collectors and carried out experiments to compare heat transfer performances of pure water and Al2O3/water nanofluids.
안동(安東) 온계종택(溫溪宗宅) 소장(所藏) 가도(家圖)를 통한 반가(班家) 평면형식 고찰
이호열,Lee, Ho-Yeol 한국건축역사학회 2008 건축역사연구 Vol.17 No.1
As a result of analyzing the floor plan shown in the three drafts, there were a great deal of differences in composing the space of the inner main hall. The inner room facing to the east with the arrangement crossing the inner floor at right angles in the 'Baekdangguje Draft' faces to the south in the east or west in front of the main house thereafter. This represents that it reflects the intent of the owner of the architecture emphasizing the size increase and ceremonies of the main house in the 'ㅁ shape', which has changed to the directions of easily accommodating the Confucian ceremonial activities in the floor plan of the inner house as the size of the main house was gradually increasing from 24 sections to 30 or 38 sections. The expansion in the size of main house further divided the functions of floor into one for daily life and the other for ceremonies as well. In other words, the 30 Sections in Yijeong Draft as being the first planned draft for reconstruction had a hall for memorial services in the main hall of the inner house, whereas the 'Draft with 38 Sections' as being the second planned draft for reconstruction was planning a room with a floor (two sections of Bangdang) for memorial purpose in the back of the inner main hall. The variations in the guest house (or space for men) shown in the drafts confirms the establishment of space for men as the size of the main house increases. We can see the change that a large guest house is placed over the south and in the south and east of the main house as the number of main house increases by 30 sections or 38 sections. Especially, a guest house with a wide space in a 'ㄴ shape' is arranged from the south of main house to the east wing in the Draft with 38 Sections. In addition, the backward sections are advanced in the front and back of guest house in the drafts with 30 and 38 sections, while a back floor or a back floor connecting to the back room or sleeping room or inner house is installed in the backward sections.