http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
태양열을 이용한 온수 및 난방 일체형 복합시스템의 성능예측에 관한 연구
한유리(Y. Han),류남진(N. J. Ruy),박윤철(Y. C. Park) 한국동력기계공학회 2008 한국동력기계공학회 학술대회 논문집 Vol.2008 No.11
In this study, a simulation program was developed with heat transfer model in the storage tank and analysis was conducted with variation of operating condition and schedule of operation to analyze performance of a hot water supply and panel heating system with a solar collector and burner combined thermal storage tank. The simulation program is divided two sections. One part is calculation of temperature variation of water which flows through the panel in the floor for heating of the residential house during 24 hours, and the other part is heat transfer calculation for the reaction time to get desired water temperature in the thermal storage tank. As results, light oil consumption and system performance during operation period were analyzed with variation of climate condition and with or without solar collector. Most of the case, oil could be saved about from 24 to 41% with installing the solar collector. The performance of the system is more dependent on radiation time of the solar collector rather than the intensity of the solar radiation.
윤소남 (Y. S. Nam),함덕용 (D. Y. Ham),한유리 (Y. Han),이근우 (K. W. Lee),정병홍 (B. H. Jeong) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
This study presents the possibility of the refrigerant control using electronic expansion valve which is operated by stepping motor. The electronic expansion valve is a type of flow control equipment that is a combination of a poppet, a positioner, three reduction gears and a stepping motor. The poppet modulates orifice its opening to maintain the controlled refrigerant flow. So, pitch control of the positioner and pulse control of the three reduction gears are very important design parameters for performance improvement of this study object valve. In this paper, the effects of the nonlinearity, the hysteresis on the performance and flow rate characteristics of electronic expansion valve were investigated. The input pulse of stepping motor, displacement characteristics and flow rate characteristics of this valve were analyzed through the experimental setup.
윤소남(S. N. Yun),함덕용(D. Y. Ham),한유리(Y. Han),이근우(G. W. Lee),정병홍(B. H. Jeong) 한국동력기계공학회 2008 한국동력기계공학회 학술대회 논문집 Vol.2008 No.11
In this study, EEV(Electronic Expansion Valve) which is consist of a stepping motor, 3-stage reduction gear, a positioner and a poppet valve and controls the mass flow in air conditioning system was researched. The steady state characteristics of the convential type EEV were disscussed by experiment and various types of EEV were also analyzed through the FEM calculation method. From this study, new model with a double bellows structure for air conditioning system was suggested and the performance characteristics were also evaluated.
윤소남(S. N. Yun),함덕용(D. Y. Ham),한유리(Y. Han),정병홍(B. H. Jeong) 유공압건설기계학회 2008 유공압건설기계학회 학술대회논문집 Vol.2008 No.10
An air conditioner(air conditioning system) is a cooling equipment that has a the process of the one-cooling cycle such as compression, condensation, expansion and evaporation. Expansion process is operated by expansion valve that is a kind of mass flow control component. The characteristics of a expansion valve design parameters such as linearity, repeatability and hysteresis are very important because these parameters affect the variation of the COP(Coefficient of Performance). This paper presents the static and dynamic characteristics of a bellows type expansion valve. The static and dynamic analysis by experiments and the structure analysis by FEM tool were accomplished for development of the new structure of expansion valve. The torque characteristics of the stepping motor and the displacement variation of the poppet valve were also analyzed through the experimental setup. In this study, the new structure of the expansion valve through the theoretical analysis and experiment was suggested. And it was confirmed that the suggested model is proper to apply in the air conditioning system.