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지역별 기상조건과 급수온도에 따른 태양열 온수공급 시스템 성능에 관한 연구
손진국 한국태양에너지학회 2019 한국태양에너지학회 논문집 Vol.39 No.6
The purpose of this study is to analyze the performance of solar thermal system according to regional weather conditions and feedwater temperature. The performance analysis of the system was carried out for the annual and winter periods in terms of solar fraction, collector efficiency and it’s optimal degree. The system is simulated using TRNSYS program for 6 cities, Seoul, Incheon, Gangneung, Mokpo, Gwangju, and Ulsan. Simulation results prove that the solar fraction of the system varies greatly from region to region, depending on weather conditions and feedwater temperatures. Monthly average solar fraction for winter season from November to February, a time when heat energy is most required, indicated that the highest is 73.6% in Gangnueng and the lowest is 56.9% in Seoul. This is about 30% relative difference between the two cities. On the other hand, the collector efficiency of the system for all six cities was analyzed in the range between 40% and 42%, indicating small difference compare to the solar fraction. The annual average solar fraction is rated the highest at 40 collector degree, while monthly average solar fraction during winter season is rated at 60 degree.
영농형 태양광발전시스템 적용을 위한 모듈배치 유형별 일사량 해석 및 분석
손진국(Jin Kug Son),송기오(Ki O Song),전현익(Hyun Ik Jeon),조선영(Sun Young Cho),여정수(Jeong Su Yeo),이동규(Dong Kyou Lee),김창건(Chang Geon Kim),박성환(Sung Hwan Park) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
In recent years, the problem of unstable income of farmers has been raised due to the decrease of rice consumption and rice prices. So residents-led rural photovoltaic is attracting attention. However, residents’ rural solar photovoltaic systems have problems with food security because they install solar power without farming. Farming solar power can sell electricity by solar power generation in parallel with farming, thereby securing food security and increasing farmers’ income. In this study, two types of modules were arranged for the application of fanning solar power, and the amount of solar radiation reaching rice was analyzed and measured according to the module arrangement. Simulation and Measurement Results When the modules were installed separately, the shading rate decreased by 5 ~ 7%.
손진국(Sohn Jin-Gug) 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.3
In this paper, performances of solar hot water supply systems arc parametrically analyzed with the variations of solar collector area, slope of collector and volume of storage. All simulations arc conducted by using TRNSYS computer program. Average solar fractions, collector efficiencies and temperatures of storage arc investigated monthly as well as annually. For system analysis, the maximum value of monthly average solar fractions has a limitation of 90 percent. As a result, the designed solar thermal system with 6㎡ collector area, 50° slope and 0.36㎥ storage volume could provide almost an annual average solar fraction of 72 percent. By increasing the storage volume to 0.42㎥, the annual solar fraction of system increases up to 73 percent.
손진국(Jin Kug Son),김형진(Hyung Jin Kim),서영호(Young Ho Seo),김병희(Byeong Hee Kim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
This paper presents characterization of blood-flow in various shapes of microchannels. The microchannel was fabricated using a polymethylmethacrylate substrate and dry film photoresist. The dry film photoresist was the bonded on polymethylmethacrylate substrate by the laminator at 90℃. The channels were fabricated two types. The first type of channel had dry film photoresist on both sides wall of chip, and the second one had dry film photoresist on one side wall of chip. The depth of microchannel was fabricated 35, 70 and 105 ㎛. The used blood was 20ul. In the experimental results of fabricated microchannel, the chip using dry film photoresist on one side wall of channel could be confirmed most effective blood flow.
온수 급탕 및 난방을 위한 히트 펌프 태양열 시스템의 성능 분석
손진국(Sohn Jin-Gug) 한국태양에너지학회 2018 한국태양에너지학회 논문집 Vol.38 No.5
This study aims to analyze the performance of solar thermal system with heat pump for domestic hot water and heat supply. There are four types of system. Systems are categorized based on the existence of a heat pump and the ways of controlling the working fluid circulating from the collector. Working fluid is controlled by either temperature level (categorized as system 1 and 2) or sequential flow (system 3 and 4). Heat balance of the system, the solar fraction, hot water and heating supply rates, and performance of heat pump are analyzed using TRNSYS and TESS component programs. Technical specifications of the main facilities are as follow; the area of the collector to 25 ㎡, the volumes of the main tank and the buffer tank to 0.5 ㎥ and 0.8 ㎥, respectively. Heating capacity of the heat pump in the heating mode is set to 30,000 kJ / hr. Hot water supply set 65 liters per person each day, total heat transfer coefficient of the building to 1,500 kJ / kg.K. Indoor temperature is kept steadily around 22℃. The results are as follows; 6 months average solar fraction of system 1 turns out to be 39%, which is 6.7% higher than system 2 without the heat pump, indicating a 25% increase of solar fraction compared to that of system 2. In addition, the solar fraction of system 1 is 2% higher than that of system 3. Hot water and heating supply rate of system 1 are 93% and 35%, respectively. Considering the heat balance of the system, higher heat efficiency, and solar fraction, as whole, it can be concluded that system 1 is the most suitable system for hot water and heat supply.
윤진국,손인진 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.8
Nanopowders of AlCr2 and Al2O3 were synthesized during high energy ball milling. Densely nanostructured AlCr2-2Al2O3composite was consolidated by high-frequency induction heated sintering within 2 min from milled powders. Highly denseAlCr2-2Al2O3 composite with relative density of up to 96% was produced under application of a 80 MPa pressure and theinduced current. The fracture toughness of a AlCr2-Al2O3 composite in this study is similar to that of previous study, whilethe hardness of a AlCr2-Al2O3 composite in this study is better than that of previous study due to the grain refinement. Thefracture toughness of AlCr2-2Al2O3 composite is higher than that of pure Al2O3. The microstructure and mechanical propertieswere investigated using FE-SEM with EDS and Vickers hardness tester.
펄스 전류 활성 연소합성에 의한 나노구조의 2MoSi<sub>2</sub>-SIC제조 및 기계적 성질
손인진,김동기,정인균,도정만,윤진국,고인용,Shon, In-Jin,Kim, Dong-Ki,Jeong, In-Kyoon,Doh, Jung-Mann,Yoon, Jin-Kook,Ko, In-Yong 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.4
Dense nanostructured $2MoSi_{2}-SiC$ composites were synthesized by the pulsed current activated combustion synthesis (PCACS) method within 3 minutes in one step from mechanically activated powders of $Mo_{2}C$ and 5Si. Simultaneous combustion synthesis and densification were accomplished under the combined effects of a pulsed current and mechanical pressure. Highly dense $2MoSi_{2}-SiC$ with relative density of up to 96% was produced under simultaneous application of a 60 MPa pressure and the pulsed current. The average grain size of $MoSi_{2}$ and SiC were about 120 nm and 90 nm, respectively. The hardness and fracture toughness values obtained were 1350 $kg/mm^{2}$ and 4 $MPa{\cdot}m^{1/2}$, respectively.
Properties and Pulsed Current Activated Consolidation of Nanostuctured MgSiO3-MgAl2O4 Composites
손인진,Song-Lee Du,도정만,윤진국 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.5
Nanocrystalline materials have received much attention as advanced engineering materials with improved physical and mechanical properties. As nanomaterials possess high strength, high hardness, excellent ductility and toughness, undoubtedly, more attention has been paid for the application of nanomaterials. Nanopowders of MgO, Al2O3 and SiO2 were made by high energy ball milling. The simultaneous synthesis and consolidation of nanostuctured MgAl2O4-MgSiO3 composites from milled 2MgO, Al2O3 and SiO2 powders was investigated by the pulsed current activated sintering process. The advantage of this process is that it allows very quick densification to near theoretical density and inhibition of grain growth. Highly dense nanostructured MgAl2O4-MgSiO3 composites were produced with a simultaneous application of 80 MPa pressure and a pulsed current of 2000A within 1min. The fracture toughness of MgAl2O4-Mg2SiO4 composites sintered from 60mol%MgO-20mol%Al2O3-20mol%SiO2 powders milled for 4 h was 3.2MPa·m 1/2. The fracture toughness of MgAl2O4-MgSiO3 composite is higher than that of monolithic MgAl2O4.