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축방향 사다리꼴 그루브 히트파이프의 열성능에 대한 실험적 연구
서정세,이운,Suh, Jeong-Se,Lee, Woon 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.4
Analysis and experiment are performed to investigate the thermal performance of a heat pipe with axial grooves. The heat pipe was designed in a 6.5 mm I.D., 17 axial trapezoidal grooves. 1000 mm long tube of aluminium, and ammonia as working fluid. A mathematical equations fur heat pipe with axial grooves is formulated to obtain the capillary limitation on heat transport rate in a steady state. As a result, heat transport factor of heat pipe has the maximum at the operating temperature of 293K in 0m elevation. As the elevation of heat pipe increases. the heat transport factor of the heat pipe is reduced markedly, comparing with that of horizontal elevation of the heat pipe. It may be considered that such behavior of heat pipe is caused by the working fluid swarmed back to the condenser port due to gravity force and supercooled by a coolant of heat exchanger. Analytical results of heat transport factor are in a good agreement with those of experiment.
태양열이용 Baffle식 축열조를 갖는 급탕난방시스템의 열성능 해석
서정세(Jeong-Se Suh),이중섭(Chung-Seub Yi),윤지훈(Ji-Hoon Yoon) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.11
A numerical study has been performed to investigate the thermal performance of solar heating system with baffle type of storage tank by using the commercial code TRNSYS. As a result, the solar fraction depends strongly on the efficiency and heat loss coefficient of solar collector as well as the heating capacity of house and the water temperature supplied to the shower. In addition, the solar fraction has been basically ranked to higher level in baffle type of storage tank than typical type of single storage tank for the range of operation condition.
태양열이용 Baffle형 축열탱크를 갖는 온수난방시스템의 열성능 해석
서정세(Jeong-Se Suh),이중섭(Chung-Seub Yi) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
A numerical study has been performed to investigate the thermal Performance of Solar heating system with baffle type of storage tank by using the commercial code TRNSYS. As a result, the solar fraction depends strongly on the efficiency and heat loss coefficient of solar collector as well as the heating capacity of house and the water temperature supplied to the shower. In addition, the solar fraction has been basically ranked to higher level in baffle type of storage tank than typical type of single storage tank for the range of operation condition.
Baffle형 축열탱크를 갖는 태양열 온수난방시스템의 열성능 평가
서정세(Jeong-Se Suh),이중섭(Chung-Seub Yi),홍정규(Jung-Kyu Hong),신유인(Yoo-In Shin) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
A numerical study has been performed to investigate the thermal Performance of Solar heating system with baffle storage tank by using the commercial code TRNSYS. As a result, the solar fraction depends strongly on the efficiency and heat loss coeficient of solar collector as well as the heating capacity of house and the water temperature supplied to the shower. In addition, the solar fraction has been basically ranked to high level in the range of operation condtion.
서정세(Jeong-Se Suh) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
Effect of external heating rate on the conversion efficiency for the steam reforming of methanol is investigated numerically considering both heat and mass transfer of the species in a packed bed microreactor. In a results from the numerical simulation, the conversion efficiency of methanol has been obtained for the external heating rate. The axial variation of mole fraction of methanol has been additionally presented for several cases of external heating rates. The results show that for the constant inlet temperature condition the conversion efficiency of methanol increases with external heating rate over the range of operating conditions.
초크랄스키 단결정 성장에서 자기장이 용질분포에 미치는 영향
김무근,서정세,Kim, Moo Gewi,Suh, Jeong Se 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.3
Numerical simulations are carried out for the magnetic Czochralski single crystal growth system. It Is shown that a magnetic field significantly suppresses the convective flow and as the strength of magnetic field becomes to be stronger, the heat transfer in the melt is dominated by conduction rather than convection. By imposing a cusp magnetic field, the growth interface shape becomes convex toward the melt. When the axial magnetic field is imposed, there occurs an inversion of the interface shape with increase of the magnetic field strength. The oxygen concentration near the interface decreases with increasing cusp magnetic field strength while axial field causes an increase of an oxygen concentration at the central region and decrease of that at the edge of the crystal. The results show that the cusp magnetic field has advantages over an axial magnetic field In the radial uniformity of oxygen as well as in the additional degree of control.