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홀로그래피 간섭 토모그래피 개발 및 3차원 자연대류 열전달에의 적용
이수만(Soo-Man Lee),강민구(Min-Gu Kang),차동진(Dong-Jin Cha),주원종(Won-Jong Joo),강보선(Bo-seon Kang) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
In this study, a practical holographic interferometric tomography system, which is instantaneous and non-contact for measuring three dimensional flow field, was developed. The system consists of holographic recording reconstruction system, fringe analysis code and computational tomography code and it is developed with GUI environment for general users. The developed system was applied to three-dimensional natural convection from a discrete flush-mounted circular heat source on the bottom of a cubic enclosure. The heat source was located at the offcenter of the bottom plate so that three-dimensional temperature field can be achieved. A set of multi-directional holographic interferograms was recorded by employing a double-reference beam, double-exposure holographic technique. Optical pathlength data were extracted from the recorded interferometric data and finally three dimensional temperature field inside the cube was reconstructed.
이수만(Soo Man Lee),김동윤(Dong Yun Kim),안정혁(Jung Hyuk An),이철성(Cheol Seng Lee),신우철(U Cheul Shin) 대한설비공학회 2019 설비공학 논문집 Vol.31 No.10
In this study, we analyzed the annual heating and cooling energy requirements of reference building with 97 certificated windows using TRNSYS 17, to review the applicability of the “Window Energy Consumption Efficiency Rating System” to the office building. The analyzed model was a medium-size office building with lightweight curtain walls and a window-to-wall ratio of 52%. The results are as follow : First, the annual total thermal load was 60,261 to 111,616 kWh and the ratio of heating load to cooling load was 1:9 showing that cooling was the main factor of the thermal load. Second, the total thermal load by SHGC showing an almost perfect linear relationship. The F-test significance probability in the regression model was 0.000 meaning statistical significance and the coefficient of determination was 0.9656 showing high correlation. In contrast, the F-test significance probability in the regression model by U-value was 0.00484 showing statistical significance but the coefficient of determination was 0.0805 showing low correlation. Third, the SHGC of window was the main factor of the total thermal load in the office building. It showed the limitation of subject in “Window Energy Consumption Efficiency Rating System” which was limited to insulation performance and airtight performance. Thus, in to evaluate the window sets in terms of energy saving, the “Window Energy Consumption Efficiency Rating System” with SHGC should be considered.
실증실험을 통한 측정 위치에 따른 주거공간 환기성능 평가
곽병창,이수만,김길태,김종엽,Kwag, Byung Chang,Lee, Soo Man,Kim, Gil Tae,Kim, Jong Yeob 한국토지주택공사 토지주택연구원 2022 LHI journal of land, housing, and urban affairs Vol.13 No.3
Ventilation plays an important role in controlling indoor air quality. Due to the recent spread of infectious diseases such as COVID-19 and with people spending more time indoors, there's been increased attention on the importance of ventilation performance. In many countries, ventilation is regulated by airflow rates and the number of air changes per hour (ACH). However, airflow rates and ACH alone do not provide an accurate account of actual indoor pollutant removal and ventilation uniformity in a space. This study looked into the ventilation performance of an actual residential unit using several sampling points instead of basing it off of airflow and air change rates. Literature review was used to derive relevant influencing factors and the tracer gas dilution method was used for the field test. The study measured air velocity, age of air, and ventilation efficiency at several locations and compared them to the average value at the center of the test space to determine the differences in ventilation performance at the selected measurement points. The study showed that different sampling locations resulted in different ventilation values. Findings of this study will be used to develop an experimental procedure for evaluating indoor ventilation performance of actual residential spaces.