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해수온도차발전 적용을 위한 자기열량효과 발전시스템 성능연구
김영민(Yeongmin Kim),양용우(Yong Woo Yang),고윤정(Yoonjung Ko),오승진(Seung Jin Oh) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
This study aimed to performance analysis of a magnetocaloric effect power generation system that can be operate at a low temperature difference of ocean thermal energy conversion system. The major components of the system are gadolinium(Gd) and permanent magnet, rotational motion is generated by the interaction of gadolinium with a permanent magnet. The electromagnetic and piezoelectric generator were connected to the gadolinium rotor, and the power generation performance by rotational motion was measured. The electromagnetic generator generated an output of open voltage 2V and a short circuit current 6mA when the temperature difference between hot and cold water was about 6.5℃ and the rotation speed was 130rpm. Under the same conditions, the piezoelectric generator produced an open circuit voltage and a short circuit current of 8V and 8.2μA, respectively.
Numerical study on a multi-stage counter-flow indirect evaporative cooler
Seung Jin Oh(오승진),Yong Woo Yang(양용우),Yoon Jung Ko(고윤정) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
This study presents the numerical modeling and the simulation of a counter-flow indirect evaporative cooler (IEC) that is thermodynamically multi-staged in order to maximize its performance. The proposed indirect evaporative cooler is basically a stack of identical IEC modules. The working principle is such that a certain portion of the dry air at the outlet of the first module is purged into the wet channel of the next module that is located underneath and the remaining is transferred to the dry channel. A series of simulation was conducted to investigate the performance of the multi-stage IEC The developed model was validated against experimental data within 2% discrepancy. Key results revealed that the proposed multi-stage counter-flow IEC produced higher cooling capacity (around 20% higher), as well as higher dew-point effectiveness under the same operating conditions. A parametric study was also made in order to find optimal operating conditions as well as optimal dimension. The results revealed that lower product air temperature and higher dew-point effectiveness were achieved with longer channel length and larger purge ratio. However, the maximum cooling capacity approached its maximum with longer channel length and 35% purge ratio.
주홍진(Hong-Jin Joo),양용우(Yong-Woo Yang),곽희열(Hee-Youl Kwak) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.5
This study was accomplished to get the foundation design data of VMD(Vacuum Membrane Distillation) system for Solar Thermal VMD plant. VMD experiment was designed to evaluate thermal performance of VMD using PVDF(polyvinylidene fluoride) hollow fiber hydrophobic membranes. The total membrane surface area in a VMD module is 5.3㎡. Experimental equipments to evaluate VMD system consists of various parts such as VMD module, heat exchanger, heater, storage tank, pump, flow meter, microfilter. The experimental conditions to evaluate VMD module were salt concentration, temperature, flow rate of feed sea water. Salt concentration of feed water were used by aqueous NaCl solutions of 25g/l, 35g/l and 45g/l concentration. As a result, increase in permeate flux of VMD module is due to the increasing feed water temperature and feed water flow rate. Also, decrease in permeate flux of VMD module is due to increasing salinity of feed water.VMD module required about 590 kWh/day of heating energy to produce 1㎥/day of fresh water.