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3차원 연소장에서의 핀-튜브 형태의 스털링엔진 고온 열교환기 설계를 위한 수치해석 연구
강석훈(Seok Hun Kang),김혁주(Hyuck Joo Kim),정대헌(Dae Hun Chung) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.11
Numerical study is conducted to design the high temperature heat exchanger of Stirling engine by using the commerical CFD solver, FLUENT. The Fin-tube type of heat exchanger is designed as a reference model, considering the type of engine which is β-configuration. To find the optimal design of heat exchanger numerical calculation is conducted by changing the shape, number and material of fin in three-dimensional combustion field. Adjusted one-way constant velocity is considered as the representative velocity of oscillating flow. The optimal design of heat exchanger considering the heat transfer capability will be suggested by using the calculation results.
강석훈(Seok Hun Kang),정대헌(Dae Hun Chung) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
The Organic Rankine Cycle (ORC) that generates electric power by using low temperature heat source is developed and experimental research is conducted. The radial turbine and high speed DC generator are designed and manufactured in this study also. As a working fluid R245fa is adopted, considering operation condition of cycle and environmental feasibility. Experiments to analyze the operation characteristics for the designed ORC system are conducted. Pressure drop phenomenon is found in condenser which is plate type heat exchanger. Study to solve pressure drop and increase cycle efficiency is conducted.
핀-튜브 형태의 스털링엔진 고온 열교환기 설계를 위한 수치해석 연구
강석훈(Seok Hun Kang),정대헌(Dae Hun Chung),김혁주(Hyuck Joo Kim) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
Numerical analysis is conducted to design the high temperature heat exchanger of Stirling engine by using the commercial CFD solver FLUENT. The fin-tube type of heat exchanger is designed, considering the type of engine which is β configuration. To find the optimum design of heat exchanger numerical calculation is conducted by changing the shape, number and material of fin, shape of working fluid channel, etc in three-dimensional combustion field. Adjusted one-way constant velocity is used as the representative velocity of oscillating flow. The optimum design of heat exchanger considering the heat transfer capability is suggested by using the calculation results.
강석훈(Seok Hun Kang),정대헌(Dae Hun Chung) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The Organic Rankine Cycle (ORC) that generates electric power by using low temperature heat source is developed and experimental study is conducted. The radial turbine and high speed DC generator are designed and developed in this study also. As a working fluid R245fa is adopted, considering operation condition of cycle and environmental friendly characteristic. Experiments to analyze the operation characteristics for the designed ORC are conducted. The maximum cycle, turbine efficiencies and power output are shown to be 5.22%, 78.7% and 32.8㎾ respectively. The factors that influence on the efficiency of the ORC are analyzed and discussed.
강석훈(Seok Hun Kang),정대헌(Dae Hun Chung) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
The Organic Rankine Cycle (ORC) that generates electric power by using low temperature heat source is developed and experimental research is conducted. The radial turbine and high speed DC generator are designed and manufactured in this study also. As a working fluid R245fa is adopted, considering operation condition of cycle and environmental feasibility. Experiments to analyze the operation characteristics for the designed ORC system are conducted. The maximum thermal (cycle) efficiency is shown to be 5.2%. And the efficiency of the developed radial turbine is shown to be more than 80%. The factors that influence on the efficiency of the developed ORC system are analyzed and discussed.
3차원 연소장 내의 스털링엔진 열교환기 설계를 위한 수치해석 연구
강석훈(Seok Hun Kang),정대헌(Dae Hun Chung),김혁주(Hyuck Joo Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Numerical analysis is conducted to design the high temperature heat exchanger of Stirling engine by using the commercial CFD solver, FLUENT. The fin-tube type of heat exchanger is designed, considering the type of engine which is ft-configuration. To find the optimal design of heat exchanger numerical calculation is conducted by changing the shape and material of fin, shape in three-dimensional combustion field. As a combustion model Methan-air-2step is used. And radiative heat transfer is also analyzed by using the discrete ordinates model. Adjusted one-way constant velocity is used as the representative velocity of oscillating flow. The optimal design of heat exchanger considering the heat transfer capability is suggested by using the calculation results.
1㎾급 스털링엔진 고온열교환기 설계를 위한 수치해석 연구
강석훈(Seok Hun Kang),김혁주(Hyuck Joo Kim),정대헌(Dae Hun Chung) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
Numerical study is conducted to design the high temperature heat exchanger of Stirling engine by using the commercial CFD solver, FLUENT. The Fin-tube type of heat exchanger is designed as a reference model, considering the type of engine which is β-configuration. To find the optimal design of heat exchanger numerical calculation is conducted by changing the material and shape and material of fin in three-dimensional combustion field. Adjusted one-way constant velocity is considered as the representative velocity of oscillating flow. The study is being conducted to find the optimal design of heat exchanger in its heat transfer capacity.
정전 분무를 이용한 미세 물 액적 생성 및 습식 사이클론 적용 방안에 관한 연구
최종원(Jong Won CHOI),정대헌(Dae Hun CHUNG),이계중(Kye Jung LEE),김정근(Jeong Guen KIM),최영찬(Young Chan CHOI),이욱현(Wook Hyun LEE),우영민(Young Min WOO),오상현(Sang Hyun OH),윤민혜(Min Hye YOUN) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
A historically well-known technique for atomizing the liquid water droplets may be electrospray, which is induced by electrostatic charging inside a confined geometry such as needle, nozzle or slit. Based on the Rayleigh’s theory of instability and Taylor’s theory, the electrospray enables to produce fine water droplets as forming a conical shape (Taylor cone) due to the highly concentrated free charge from high intensity of electrical potential between two oppositely charged electrodes. We herein applied this technology to the wet electrostatic precipitator, especially in cyclone structure. The wet electrostatic precipitator has been reported to possess a few flaws such as un-uniform water film formation on the wall, excessive waste water and large energy consumption. Applying the negative potential to the needles and the positive potential to the collector body, we observed sub-100㎛ water droplets are generated by means of an electrospraying process without any pressure. Such highly charged droplets pull the fine particles inside a flue gas, stick to the collector body and then finally free fall down. In this study, we designed and fabricated the electrospray driven wet cyclone electrostatic precipitator, investigating the particle collection performance with the tangential velocity of ~10 m/s at the cyclone inlet, for various voltages and water flowrates. The experimental results show that the effective flowrate through one needle for reaching the PM2.5 collection efficiency of 95% and the power consumption per a needle are measured as 20 ccm and 0.35 W (35 kV and 0.01 mA). Comparing that the the ratio of water to flue gas and power consumptions of the previously commercialized wet electrostatic precipitators for the treatment capacity of 50 CMM have been reported as 1.0 L/m<SUP>3</SUP> and 840 kW, our measurement gave us 0.2 L/m<SUP>3</SUP> and 175 W, which are merely 20% and 20.8% over those of the commercialized one, respectively