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김형덕,고철균,문승재,Kim, Hyung-Deok,Koh, Churl-Kyun,Moon, Seung-Jae 한국플랜트학회 2013 플랜트 저널 Vol.9 No.2
최근 발전회사들은 연료비 절감 방안으로 석탄화력발전소의 연료로 저열량탄 사용을 확대하고 있다. 하지만, 저열량탄 사용으로 비용절감이라는 장점을 가져오는 반면, 발열량이 낮은 탄종 연소 시 터빈에 공급되는 증기온도보다 높은 온도의 연소가스량 증가로 인한 대류열전달이 증가되어 재열기 온도 상승을 초래하게 되었다. 재열기 온도 상승은 재열기 튜브 피로증가와 발전소 효율 저하요인인 재열저감수 사용의 결과를 가져오게 된다. 따라서 재열기 출구온도와 관계된 운전변수들을 분석하여 재열기 출구온도를 적정하게 유지하여 재열저감수 사용량을 절감할 수 있는 방안에 관하여 논하였다. When four operation parameters are adjusted, the temperature of reheater steam is around the designed operator temperature and the decrease of reheater spray flow rate is achieved. As a result, the decrease of thermal efficiency also can be prevented. To keep the reheater exit temperature on the designed value and decrease the use of reheater spray flow rate, the control of four operation parameters is considered and applied in the operation of a thermal power plant.
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최우영,고철균,이재헌,류해성 대한설비공학회 1999 설비공학 논문집 Vol.11 No.5
A load calculation program based on TFM(Transfer function method) has been proposed in this study. The validity of the current method has been verified by comparing heat gain calculation by TRF(Thermal response factor) with that by CTF(Conduction transfer function) adopted in ASHRAE. In addition, it seems that the CTF coefficients given in ASHRAE tables have somewhat ambiguity The load calculation program developed in the current study has been employed to calculate cooling load from the exterior walls and roof of example 6 in the ASHRAE. The results are found in good agreement.
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이효승,고철균,문승재,Lee, Hyo-Sung,Koh, Churl-Kyun,Moon, Seung-Jae 한국플랜트학회 2013 플랜트 저널 Vol.9 No.2
펌프실 내 펌프가 1대 배치되는 경우 펌프 동력과 펌프기초 면적이 주어지면 펌프실 면적을 찾을 수 있다. 다만, 일부 펌프는 펌프와 발전소 배치 특이성에 따라 펌프실 면적이 결정된다. 그러나 펌프실 내 펌프가 2대 배치되는 경우 펌프 동력과 펌프기초 면적을 이용한 펌프실 면적을 구하는 연계관계를 찾을 수 없다. 그리고 펌프 동력과 펌프기초 면적의 연계관계도 찾을 수 없다. For areas installed with one pump, the trend for expected sizes of pump room areas is observed once pump power and floor dimensions are provided. However, these pump rooms with auxiliary charging pumps, turbine driven auxiliary feedwater pumps, and pump rooms with a separate valve room have unique ways to determine the pump room area. No definite trends are identified for areas installed with two pumps using pump power and floor dimensions. The relationship between pump power and floor dimensions is also unable to be found.
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배진효,박만흥,고철균,이재헌,Bae, Jin-Hyo,Park, Man Heung,Koh, Chul-Kyun,Lee, Jae-Heon 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.10
The Regulatory Guide 1.82 recommends an analysis of hydraulic performance for sump of ECCS (Emergency Core Cooing System) when LOCA(Loss of Coolant Accident) occurs in a nuclear power plant. The present study deals with 3-dimensional, unsteady, turbulent and two-phase flow simulation to examine the behavior of mixture of reactor coolant and debris near the floor of containment building in conjunction with appropriate assumptions. The dispersed solid model has been adjusted to the interfacial momentum transfer between reactor coolant and debris. According to the results, the counterclockwiserecirculation zone had been formed in the region between sump and connection aisle about 376 second after LOCA occurs. The debris thickness accumulated on a sump screen periodically increases or decreases up to 2000 second, afterwards its peak decreases.
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노홍구,이재헌,고철균 대한설비공학회 1999 설비공학 논문집 Vol.11 No.5
Heat dissipation in the domestic switching room has been gradually increased. Therefore, numerical study on the cooling characteristics of the telecommunication system in a switching room for three kinds of the air supply and return flow system was investigated to develop effective flow system. As a result, the cooling performance of the under floor air supply and overhead return flow system was the best.
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송규석,김경환,이승철,고철균,이재헌,오명도,Song, Kyu-Soek,Kim, Kyung-Hwan,Lee, Seung-Chul,Ko, Chul-Kyun,Lee, Jae-Heon,Oh, Myung-Do 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.7
The electronic refrigerating kimchi jar operates with a low noise because it contains no compressor but it consumes more energy than that of an refrigerator with compressor. In this paper, the heat flow characteristics and cooling performance of an electronic refrigerating kimchi jar are studied by means of experiments. When the storage temperature is kept in a range of $-5.7^{\circ}C$ to $4.1^{\circ}C$. in the case of three ambient temperatures; $12.7^{\circ}C$, $22.3^{\circ}C$ and $32.2^{\circ}C$, the cooling performance of $20{\ell}$ kimchi jar is investigated. The experiments show that the temperature difference that exists between kimchi jar and its ambient provides a measure of the coefficient of performance of kimchi jar. It is also found that ratio of net pumping heat to the heat pumping rate of thermoelectric module is independent of the temperature difference.
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