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백영진(Baik, Young-Jin),김민성(Kim, Min-sung),장기창(Chang, Ki-Chang),윤형기(Yoon, Hyung-Kee),이영수(Lee, Young-Soo),나호상(Ra, Ho-Sang) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
In this study, HFC ORCs (Organic Rankine Cycles) are investigated for a low-temperature geothermal power generation by a simulation method. A steady-state simulation model is developed to analyze and optimize cycle's performance. The model contains a turbine, a pump, an expansion valve and heat exchangers. The turbine and pump are modelled by an isentropic efficiency. Simulations were carried out for the given heat source and sink inlet temperatures, and given flow rate that is based on the typical power plant thermal-capacitance-rate ratio. 3 HFC fluids are considered as a candidate for a working fluid of low-temperature ORCs. In this study, all optimized HFC ORCs are shown to yield almost the same performance in terms of power for a low-temperature heat source of about 100?C.
Cloning of ada Gene of E. Coli K12 into E. Coli ada Mutants
백영진,정선호,양철학,Baik, Young-Jin,Chung, Sun-Ho,Yang, Chul-Hak 생화학분자생물학회 1986 한국생화학회지 Vol.19 No.3
E. coli ada 변종인 I-27을 MNNG-변이화 방법으로 분리하였다. 이 I-27 변종은 MNNG, MMS와 같은 간단한 알킬화 시약에 대해 증가된 민감성을 나타내었고 MNNG에 대한 적응반응을 유도하지 못하였다. 이 변종은 $O^6$-methylguanine methyltransferase와 3-methyladenine DNA glycosylase II 효소의 활성을 유도하지 못하였다. E. coli K12의 DNA를 제한효소 PstI으로 부분 가수분해한 뒤 pBR322 vector에 접합하여 ada 유전자를 cloning하였다. 재조합 plasmid인 pEMT1은 ada 변종인 I-27이 MNNG에 저항성을 나타내도록 하였으며, 또 유도되지 않은 상태에서도 methyltransferase의 활성을 나타내도록 하였다. pEMT1을 제한효소 Hind III로 가수분해하여 pBR322에 접합시킨 뒤 I-27에 넣어서 subcloning을 하였으며 이 때의 재조합 plasmid인 pEMT2는 Hind III 로 가수분해 한 pEMT1의 3.1 kb 크기의 DNA 조각을 포함하고 있었다. An Escherichia coli ada mutant, I-27, was isolated by N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) treatment. This mutant showed increased sensitivity to simple alkylating agents such as MNNG and methyl-methanesulphonate (MMS) and was unable to induce the adaptive response to MNNG. The I-27 was defective in inducing activities of $O^6$-methylguanine methyltransferase and 3-methyladenine DNA glycosylase II. The $ada^+$ gene was cloned from wild type E. Coli K12 by ligating bacterial DNA partially digested with PstI into pBR322. The recombinant plasmid, obtained above, gave MNNG resistance to ada mutant, I-27, and resulted in the constitutive synthesis of methyltransferase. Further subcloning of pEMT1 was achieved by ligating a Hind III digest of pEMT1 into pBR322 and transforming it into the 1-27, an ada mutant. The resultant recombinant plasmid, pEMT2, contained a 3.1 kb Hind III fragment of the pEMT1 DNA.
백영진(Young-Jin BAIK),신형기(Hyung-Ki SHIN),이길봉(Gilbong LEE),이범준(Beomjoon LEE),조준현(Junhyun CHO),노철우(Chul Woo ROH),나호상(Ho-Sang RA) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In response to the growing interest in supercritical carbon dioxide (S-CO2) power cycle technology because of its potential enhancement in compactness and efficiency, the S-CO2 cycles have been studied intensively in the fields of nuclear power, concentrated solar power (CSP), and fossil fuel power generation. By utilizing carbon dioxide’s property changes near the critical point, the compression work can be reduced, which results in a significant efficiency improvement. In this study, the current status of the research project on the supercritical carbon dioxide power cycle in KIER (Korea Institute of Energy Research) was introduced. During the first phase of the project, the un-recuperated supercritical Brayton cycle, which was designed to have a net power of 12.6 ㎾, was built. The cycle was composed of the turbo-alternator-compressor unit (TAC) of maximum speeds of 70,000 rpm, two PCHEs (Printed Circuit Heat Exchangers) and a thermal oil heater of capacity of 697 ㎾. The maximum design pressure and temperature of the cycle was 135 bar and 180℃, respectively, while the minimum of those was 79 bar and 35.9℃, respectively. After a successful cold-run test of the TAC unit at a target spin speed of 70,000 rpm, the cycle test loop was test-run up to the spin speed of 30,000 rpm with supercritical CO2. In the second phase of the project, the recuperated supercritical Brayton cycle has been being optimized and designed.
저온 지열발전의 출력 극대화를 위한 흡수식 동력 사이클의 시뮬레이션
백영진(Young-Jin Baik),김민성(Minsung Kim),장기창(Ki-Chang Chang),이영수(Young-Soo Lee),윤형기(Hyung-Kee Yoon) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.2
본 연구에서는 지열발전 등과 같은 저온 열원을 에너지원으로 하는 발전에 응용될 수 있는 흡수식 동력 사이클의 출력 최적화를 수행하였다. 이를 위해 정상상태 사이클 시뮬레이션을 수행하여 사이클의 성능을 고찰하였다. 시뮬레이션은 열원과 열침의 입구온도 및 유량을 고정한 상태에서 수행하였으며, 일반적인 발전소의 열원-열침 유량비를 고려하였다. 사이클의 성능은 두 개의 독립변수를 이용하여 나타내었는데, 이는 분리기 입구 암모니아 농도와 터빈 입구 압력이다. 시뮬레이션 결과, 100℃의 지열수와 20℃의 냉각수(지열수 유량의 5배) 조건에서, 흡수식 동력 사이클을 이용하면 지열수 유량 1 ㎏/s 당 최대 약 14 ㎾의 출력을 얻을 수 있음을 보였다. In this study, an absorption power cycle, which can be used for a low-temperature heat source driven power cycle such as geothermal power generation, was investigated and optimized in terms of power by the simulation method. A steady-state simulation model was adopted to analyze and optimize its performance. Simulations were carried out for the given heat source and sink inlet temperatures, and the given flow rates were based on the typical power plant thermal-capacitance-rate ratio. The cycle performance was evaluated for two independent variables: the ammonia fraction at the separator inlet and the maximum cycle pressure. Results showed that the absorption power cycle can generate electricity up to about 14 ㎾ per 1 ㎏/s of heat source when the heat source temperature, heat sink temperature, and thermal-capacitance-rate ratio are 100℃, 20℃, and 5, respectively.