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적외선 열화상 기술을 이용한 반사판 재질에 따른 비가시 영역의 결함 측정 평가
김창오,강성훈,박일철,정현철,김경석,김상채 한국비파괴검사학회 2019 한국비파괴검사학회지 Vol.39 No.2
The objective of this study is to measure defects using reflectors and to evaluate the reflectors as well as defects by precise measurements of defects for various reflectors. In the study, a reflector was used to overcome the measurement limitations caused by invisible areas, such as the backsides of pipes, via infrared thermal imaging. Reflectors were selected according to the temperature change and energy change rate per unit time of the reflector and heat source according to the material, and the defects in the invisible regions were measured and evaluated using each of the selected reflectors. Thus, It was possible to improve the detection rate of defects by selecting an appropriate reflector considering the space limitation and thermal characteristics of the target material. 본 연구는 적외선 열화상(infrared thermography)시스템을 구성하여 반사판에 따른 결함을 측정하고, 이를 이용하여 여러 가지 반사판별로 결함을 정밀 계측하여 반사판과 결함을 평가하는데 목표가 있다. 적외선 열화상을 이용하여 배관의 후면과 같은 보이지 않는 영역의 측정 한계를 극복하기 위하여 반사판을 사용하였다. 재질별 반사판과 열원의 단위시간당 온도변화와 에너지 변화율에 따라 반사판을 선정하였으며 선정된 반사판을 이용하여 비가시 영역의 결함을 측정 평가 하였다. 공간 제한 및 대상 물질의 열적 특성을 고려하여 적절한 반사판을 선택하여 결함의 검출율을 향상 시킬 수 있을 것이다.
에탄올을 첨가한 TMA 포접화합물의 냉각특성에 대한 연구
김창오,정용우,박호진,김진흥,정낙규 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.1
The purpose of this study is to investigate the propriety of TMA clathrate as a cold storage medium. Particularly, this is to examine the extent of subcooling improvement when the additives are added to the TMA clathrate, because water used cold storage material has low phase change temperature and subcooling. This study has been analyzed and compared with TMA 30 wt% clathrate how phase change temperature, subcooling and specific heat in the various concentrations are changed. This results view to be improved phase change temperature and subcooling of TMA 30wt% as a cold storage medium, when it had some additive. Additionally, it is found that the additive must be controlled under available solution limit and study for new additive must be lasted to know its effect.
에탄올을 첨가한 TMA 포접화합물의 냉각특성에 대한 연구
김창오,김진흥,정낙규,김석현 대한설비공학회 2002 설비공학 논문집 Vol.14 No.8
The purpose of this study is to investigate the propriety of TMA clathrate as a cold storage medium. Particularly, this is to examine the extent of subcooling improvement when the additives is added to the TMA clathrate, because water used for cold storage ma terial has low phase change temperature and subcooling. This study has been analyzed and compared pure water with TMA 30 wt% clathrate how phase change temperature, subcooling and specific heat in the various concentrations are changed. This results prove low phase change temperature and subcooling control effect when the ethanol is added to the TMA 30 wt% clathrate than the TMA 30 wt% clathrate. In addition, it results low specific heat when there is added to the TMA 30 wt% clathrate over 0.5 wt% ethanol in the cold heat source temperature under $-7^{\circ}C$. The other side, it results high specific heat when the ethanol is added in it at the cold heat source temperature under $-5^{\circ}C$. Therefore, it is found that the additive must be controlled by available solution limit and study for new additive must be lasted to know its effect.
김창오,서동표,정낙규,오율권,김진흥 朝鮮大學校 機械技術硏究所 2001 機械技術硏究 Vol.4 No.2
One way to reduce abroad dependence for energy is to utilize solar energy when we are now confronted with not only insufficiency of natural resources but also the serious problems of environmental pollution. Therefore, full attention must now be paid to the development of solar energy system as alternative energy resource. To achieve this, solar hot water heating system was established at Chosun university, Gwang-ju. and experimental data were obtained based on meteorological data and solar radiation. This study has used the monthly mean values of the daily measurements obtained by data acquisition software Labview. Experimental study shows Gwang-ju is a good region for the utilization of solar energy.