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표면 열전달 저항이 배제된 건물 벽체 열성능 현장 측정 기법
김승철,김상봉,나환선,Kim, Seungchul,Kim, Sangbong,Nah, Hwanseon 한국전력공사 2020 KEPCO Journal on electric power and energy Vol.6 No.2
In this paper, a new experimental method to determine the thermal resistance of building wall was proposed by improving the heat flow method (HFM) based on the air-surface temperature ratio theory. This technique measures the thermal resistance of the wall excluding the inner and outer surface heat transfer resistance. Unlike conventional HFM, this value can be compared directly with the theoretical reference value. Its performance was verified using three mock-up structures with a theoretical thermal transmittance of 0.5, 3.3, and 0.18 W/㎡·K respectively. After measuring the variations in the temperature and heat transfer rate of the mock-ups for 383 hours, the thermal transmittances were determined to be 0.47, 3.10, and 0.18 W/㎡·K, which corresponded to errors of 5.2, 6.2 and 0.5%, respectively, compared to the theoretical values. It was concluded that this technique can directly compare the thermal resistance of the wall between the existent stage and initial stage after construction.
황성욱(Hwang, Sungwook),정훈(Jung, Hoon),나환선(Nah, Hwanseon),원종률(Won, Jongryul),김정훈(Kim, Junghoon) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
Reasonable usage methods of energy resources, which are limited for human beings to use, consists of new & renewable energy (NRE) and demand side management (DSM). All technologies and policies for energy resources are classified into two fields, methods for using new energy resources and methods for using conventional fuel energy resources. Various development activities for these fileds have been implemented and various subsidy programs have been operated to penetrate into markets rapidly. These subsidy programs have various types of subsidy by energy resources and programs and the budget are funded by government, which is called Electric Power Industry Basis Fund and is managed considering technology level, economic analysis, global environment, etc. These subsidy programs are managed by Korea Energy Management Corporation (KEMCO) for NRE and by Korea Electric Power Corporation (KEPCO) for DSM, the management are different among two corporations because the purposes and features of establishment are different though these are all public organization. KEMCO is managing the NRE subsidy programs according to the government will, while the management of KEPCO subjects to power system operations though the government will for DSM is considered. NRE which is on the initial phase of diffusion would not affect on power system seriously but the affects could be grown when the diffusion and importance are expanded. Hence some integrated affection analyses considering NRE and DSM are required and this paper shows the concept of integrated operation strategies with ground source heat pump systems which are related with two fields simultaneously.
전기에너지주택 보급을 고려한 수요관리 프로그램의 운영전략 개선에 관한 연구
황성욱(Sungwook Hwang),이현주(Hyeonju Lee),나환선(Hwanseon Nah),김정훈(Junghoon Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
This paper proposes a methodology for operation strategies of DSM programs considering the diffusion of all-electrified houses, which is one of the strategic load growth in DSM program patterns. In this methodology the DSM portfolio with B/C analysis and power system analysis are carried out to find the optimal solution.
나환선 ( Nah¸ Hwan-seon ),서용표 ( Suh¸ Yong-pyo ),송영철 ( Song¸ Young-chol ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
The purpose of this study is to quantitatively evaluate the aging status of epoxy coating onto containment structure in nuclear power plant. Prior to main accelerated aging test, pre-test under short term acceleration was performed to identify the reliability of relation between visual and ultrasonic testing results. Time-dependent degradation results of epoxy coating taken by VT were different from results taken by UT. According to aging acceleration factor, degradation pattern of epoxy coating by VT was similar not only to that by UT, but also to that by elongation change. The possibility to develop new methodology for investigation of time-dependent epoxy coating was identified.