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수냉식 CPU 냉각 시스템의 냉각성능에 관한 실험적 연구
함형창(Hyoung Chang Ham),박인환(In Hwan Park),박창용(Chang Yong Park) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
In this experimental study, a CPU cooling system with water was applied for cooling the CPU of a desk top computer, instead of a conventionally used air-cooled fin-fan type CPU cooler. The performance of the CPU water cooling system was measured with the variation of water flow rate from 0.6 to 1.3 L/min, radiator fan speed from 1300 to 2400 rpm, and CPU operating load from idle to full conditions. Time taking to reach a study state for the cooling system increased with the increase of water flow rate and fan speed. The measured temperature difference at the inlet and outlet of a waterblock and a radiator was influenced by the CPU load conditions and water flow rate, but the effect of fan speed on the temperature difference was minor. The temperature difference was less than 1.1℃ for all test conditions, which implied that the system cooling capacity was significantly higher than the heat generation rate of the CPU. The pressure drop of water at the inlet and outlet of the waterblock and radiator was relatively small and its values ranged from 0.5 to 3.2 ㎪.
핀-관 응축기의 핀과 관의 종류가 성능에 미치는 영향에 관한 수치적 연구
조다영(Da Young Cho),함형창(Hyoung Chang Ham),박창용(Chang Yong Park) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
A numerical study on the effects of tube and fin types on a fin-tube condenser was performed. In the condenser model developed in this study, the air and refrigerant distribution on the condenser was assumed to be uniformed. The model was validated by the comparison with an experimental results. Various correlations were applied for several different types of fins and tubes. Simulation results showed that the condenser with wavy fin and herringbone tube has the largest capacity, even though the capacity difference to other combinations of fins and tubes was small except the usage of plate fin. From the calculated thermal resistance for refrigerant and air side, it was concluded that effect of tube types on the capacity of the condenser, investigated in this study, was small.
Al2O3-물 나노유체의 농도 및 입자크기에 따른 열전도 계수변화에 관한 실험적 연구
김재성(Je Sung Kim),함형창(Hyoung Chang Ham),박창용(Chang Yong Park) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
In this study, the thermal conductivity of nanofluids was experimentally measured by using a transient hot-wire method. The base fluid was water The thermal conductivity of nanofluids was increased with the decrease of particle size and the increase of volumetric concentration for the nano particle. The enhancement of thermal conductivity was significant at low concentrations below 1.0%, and its enhancement rate was decreased at concentrations above 1.0%. The experiment was performed up to 3% due to the sedimentation of nano particles.