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朴伊東,權養球 成均館大學校 科學技術硏究所 1993 論文集 Vol.44 No.1
1) Parallel operation : The parallel operation having a different capacity brings about a head loss due to the reverse flow of the unbalance in pressure between two pumps at some condition. So it should be operated in the careful consideration of frictional head loss and pump's head capacity to operate in parallel operation. But it can be obtained from this study that the capacity of small pump is equal to that of large pump and the performance of parallel operation is Tmproved. And therefore, it could be otained the optimum operation at Case Ⅶ (N_L = 2,000, N_s = 000) and Case Ⅷ(N_L = 2,000, N_s = 2,500) in parallel operation. 2) Series operation : The series operation having a different capacity brings about a head loss at some condition due to the flow limit of small pump. And it can be obtained from this study that the capacity of small pump is approachaed to large pump and the performance of series operation is Tmproved. And therefore it can be obtained the optimum operation at Cast I (N_L =3,000, N_s = 3,000), Case Ⅳ (N_L = 2,500, N_s = 3,000), Case Ⅶ(N_L = 2,000, N_s = 3,000) in series operation.
LDV를 이용한 저속 원심회전차내 유동 속도 측정에 관한 연구
박이동,권양구 成均館大學校 科學技術硏究所 1993 論文集 Vol.44 No.2
To understand the flow phenomena within a channel of impeller and estimate the performance of compressor or pump, the flow velocity was measured by LDV with the advantages of non-intrusion in a flow field. The object of this study is to present a measuring method of flow velocity by LDV and to improve the measuring techniques. In order to estimate the characteristics of flow field within a channel, the flow velocity has been measured with respect to variation of blade angle of exit and to increase the S/N ratio of LDV, the half angle of lens has been increased and the hub wall coated with the soot to absorb the diffused reflection light. For the blade angles of exit, flow losses and deviation angle were small at 54° and large at 122°, and energy transfer coefficient had a good performance at 90°.
朴伊東,金東燮,權養球 成均館大學校 科學技術硏究所 1995 論文集 Vol.46 No.2
The distribution of pressure in an impeller of a centrifugal pump was investigated to operate under the optimum, conditions according to the variation of dynamic factors such as rotational speed and flowrate in an impeller. The interchange of energy actually are as follows. 1) The variations of pressure in the radial direction had almost the same patterns as the flowrate was changed and the outlet pressure decreased with the increase of the flowrate. 2) It showed that the pressure increased in the radial direction of impeller as the rotational speed increased, and the same phenomenon took place with the variation of flowrate. Otherwise there was little recovery of pressure in the region of low rotational speed and high flowrates(5.0, 5.5 lps) . 3) The head-flowrate of the characteristic curves increased simultaneously according to the increase of rotational speed, and the power gradient of the power-flowrate curve increased as the rotational speed increased and the efficiency-flowrate curve showed that the efficiency was the same in a low flowrate and higher in a high flowrate according to the increase of rotational speed.
환기효율의 정량적 평가를 통한 필요환기량 산정방법에 관한 연구(제1보) : 각종 환기방식에 따른 실내기류 및 온도분포의 수치예측
김용경,정순성,권양구,이정재 대한건축학회 1999 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.19 No.1
The purpose of this paper is to analyse the performance of a different types of ventilation system under all of the heating, cooling, and isothermal conditions so as to numerically predict the air flow and the temperature distribution in an office building. In order to predict the air flow, the temperate distribution, and the air quality, we use Computational Fluid Dynamics including the effect of room geometry, heat sources, and occupants in the design process of ventilation systems. The results according to location of the inlet and opening position, and the room temperature on thermal comfort and ventilation capacity were computed. It leads to know the optimal location of the inlet and opening position under three control variables. Though the processes mentioned above, there, is possibility of CFD in that ventilation requirement using evaluation of ventilation effectiveness can be easily obtained.
최석용,정순성,권양구,이정재 대한건축학회 1999 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.19 No.1
It is a serious subject for energy conservation to prevent the energy loss caused by mixing of heated and cooled air jets in a building which two types of air-conditioning systems are adopted in the perimeter and interior zones. The purpose of this paper is to clarify the quantitative and qualitative mechanisms of the mixing loss and to propose preventive methods for it. In this paper, by using the dynamic heat calculation, heat extraction load of a typical office building is calculated. According to the result, numerical simulation based on the computational fluid dynamics were performed in order to measure the minting loss in physical size HVAC system. Then, the distribution of air temperature and velocity is analyzed in order to grasp the relations among factors influencing the mixing loss.