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강정길,김기효,박태영,김종수,Kang, J.K.,Kim, K.H.,Park, T.Y.,Kim, J.S. 대한설비공학회 1995 설비공학 논문집 Vol.7 No.1
The object of the present study is to develop a high performance evaporator for automotive air conditioner. The experiment has been conducted on evaporative heat transfer coefficient inside a plate type heat exchanger with a sharp 180-degree turn flow. The test plates have different formed surface, cross-ribbed channel and elliptical-ribbed channel. Also experimental study has been performed to determine optimal design in elliptical-ribbed plate heat exchanger with different turn clearance. In addition to the above experiments, refrigerant behavior and surface temperature distribution in the plate heat exchanger were observed using color thermoviewer(infrared thermometer). In this experiment, working fluid was used R-12 and test conditions were as follows : (1) saturation pressure of $2.116kg/cm^2$, (2) mass fluxes of 40 to $70kg/m^2s$, (3) heat fluxes of 4,500 to $7,300W/m^2$, (4) inlet quality of 0.1 to 0.7. The results indicated that the evaporative heat transfer coefficient of an elliptical-ribbed plate heat exchanger was higher than that of cross-ribbed plate heat exchanger. Also optimal turn clearance in an elliptical-ribbed plate heat exchanger was determined.
양승대(Yang, Seung-Dae),정승환(Jung, Seung-Hwan),최주엽(Choi, Ju-Yeop),최익(Choy, Ick),이상철(Lee, Sang-Chul),이동하(Lee, Dong-Ha) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.11
This paperis aboutthe study ofa stand-alone photovoltaic powerconditioning system with an energy storage system with battery.The paper proposes the appropriate circuit modelof stand-alone PV PCS considering the maintenance of the battery system. It also proposes the buck converter modeling by a state-spaceaveraging method considering characteristics of solar cell. Lastly, it shows the way to choose the suitable battery and to design the model of bi-directional converter for charging and discharging battery. PSIM simulation is used to validate the proposed algothim of the system.