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가솔린 직접 분사 인젝터 방사소음 원인 분석 및 신호처리
곽윤상 ( Yun Sang Kwak ),박준홍 ( Jun Hong Park ) 한국액체미립화학회 2014 한국액체미립화학회 학술강연회 논문집 Vol.2014 No.-
A gasoline direct injection (GDI) engine uses its own injectors for high pressure fuel supply to the combustion chamber. High frequency impact sound during the injection process is one of the main contributors to engine combustion noise. This impact noise is generated during opening and closing by an injector rod operated by a solenoid. Also low frequency sound radiate during the injection process caused by high pressure fuel. For design of an injector with reduced noise generation, it is necessary to analyze its sound radiation mechanism and propose consequent evaluation method. Spectral and modal characteristics of the injectors were measured through vibration induced by external hammer excitation. To evaluate impulsive sounds more effectively, signal processing and Prony method of sounds was used for verifying influence of injection fuel and injector modal characteristics.
윤상국(Yun Sang-Kook),곽희열(Kwak Hee-Youl) 한국태양에너지학회 2010 한국태양에너지학회 논문집 Vol.30 No.3
The evaporative desalination system using solar thermal energy would be the efficient and attractive method to get fresh water from brine due to low carbon dioxide generation. In this research the solar desalination system as a heating source of refrigerant R123 in the evaporator was considered. The circulation of refrigerant in the evaporator can reduce the energy consumption of the system, because of using the latent heat of the refrigerant 123 instead of the sensible heat of present hot water. The system was comprised of the single-stage fresh water production unit on the capacity of 1ton/day with shell and tube type evaporator, heaters instead of solar collector to supply the proper heat to refrigerant, and refrigerant and brine circulation systems. Various operating flowrate and temperature ranges were varied in the experiments to get the optimum design data. The results showed that the optimum flow rate of brine feed rate to evaporator was 1.2Liter/min, and the yield of fresh water was increased as higher temperature of feed brine. It was confirmed that the circulation flowrate of heating source of refrigerant was decrease of one fifth of the present warm water system, and very efficient system for solar desalination.
윤상국(Yun Sang-Koo),정일영(Jeong Il-Young),곽희열(Kwak Hee-Youl),주홍진(Joo Hong-Jin),황인선(Hwang In-Seo) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.4
The evaporative desalination system using solar thermal energy would be the efficient and attractive method to get fresh water from brine due to various advantages. In this research the solar desalination system as a heating source of refrigerant R123 in the evaporator was considered. The circulation of refrigerant in the evaporator can reduce the energy consumption of the system, because of using the latent heat of the refrigerant instead of the sensible heat of present warm water. The system was comprised of the single-stage fresh water production unit on the capacity of 1ton/day with shell and tube type evaporator, heaters instead of solar collector to supply the proper heat to refrigerant, and refrigerant circulation system. Various operating flow rate and temperature ranges were imposed in the experiments to get the optimum design data and the results showed that the optimum flow rate of brine feed rate to evaporator was 1.2Liter/min, and the yield of fresh water was increased as higher temperature of feed brine. It was confirmed that the circulation flow rate of heating source of refrigerant was decrease of one fifth of the present warm water system, and very efficient system for solar desalination.
김정배(Kim Jeongabe),윤상국(Yun Sang-Kook),이장호(Lee Jang-Ho),곽희열(Kwak Hee-Youl) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-
Parametric experiments for evaluating the performance of fresh water generator applied plate type heat exchanger were performed in this study. The test facility for the performance test were designed and manufactured. The maximum fresh water yield of the fresh water generator applied in this study was designed as 1.5 Ton/day. The parameters relating with the performance of fresh water generator are known as sea water inlet temperature, hot water inlet temperature, and hot water flow rate. The test ranges for each parameters were 10, 20, and 3 0℃ for sea water inlet temperature, 65, 75, and 85℃ for hot water inlet temperature, 2.0, 2.5, and 3.0m3/hr for hot water inlet volume flow rate, respectively. And the experiments to reveal the accuracy of experimental apparatus and to show the repeatability and reproducibility were also performed. The quantitative analysis for the heat transfer mechanism and mass balance under physically possible assumptions is also conducted with simple thermodynamic equations. The experimental and estimated quantities were compared. Through the experiments and simple analysis, this study showed detail operation characteristics of fresh water generator with plate type heat exchanger.
증발식 다중효용 담수기에서 열교환기 튜브 배열 및 형상에 따른 액막 유동에 관한 수치해석
정일영(Jung, Il-Young),윤상국(Yun, Sang-Kook),주홍진(Joo, Hong-Jin),곽희열(Kwak, Hee-Youl) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.11
This study was performed numerical analysis in order to analyze liquid film flow of heat exchanger tube arrangement and configuration of evaporative multi effect distillation system using medium-temperature. Simulation was accomplished the two-dimensional calculations using commercial analyses program FLUENT based on the FVM(finite volume method). Fresh water generator of this study used Shell & Tubes heat exchanger with Cu_Nitube, configuration of tube used bare tube and corrugated tube, and arrangement of tube used in-line array and staggered array. Performance of heat exchanger through the formation of liquid film was compared and analyzed. Liquid film flow occurred that falling on heat exchanger tube wall. Result of simulation showed that liquid film thickness of in-line arrangement was found0.57mm with bare tube and 0.67mm with corrugated tube, respectively. And liquid film thickness of staggered arrangement was found 0.39mm with bare tubes and 0.62mm with corrugated tubes, respectively. Liquid film thickness of corrugated tube showed thicker than bare tube, but heat transfer rates of corrugated tube showed higher than bare tube. The reason was considered that surface area of corrugated tube was wider than bare tube. And liquid film thickness of staggered arrangement showed thinner than in-line arrangement, so thermal performance of staggered arrange mentshowed higher than in-line arrangement.
태양에너지 해수담수화를 위한 증발식 다중효용 담수기 개발
주홍진(Joo Hong-Jin),황인선(Hwang In-Seon),윤상국(Yun Sang-kook),윤응상(Yun Eung-San),서태범(Seo Tae-Beom),곽희열(Kwak Hee-you) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.4
This study was carried out to evaluate the performance for Multi Effect Distillation(MED) with solar energy desalination system. It designed and manufactured Multi effect distillation with 3㎥/day capacity in order to perform of evaluation. The parameters relating with the performance of Multi Effect Distillation are known as hot water flow rate. The experimental conditions for each parameters were 18℃ for sea water inlet temperature, 75℃ for hot water inlet temperature, 2.4, 3.6, and 4.8 ㎥/hour for hot water inlet volume flow rate, respectively. The results are as follows, Development for Multi effect distillation is required about 40㎾ heat source to produce 3㎥/day of fresh water. Based on the results of this study, It makes possible to secure economics of desalination system with solar energy which is basically needed development of high efficiency fresh water generator