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함영복(Y. B. Ham),최준혁(J. H. Choi),서우석(W. S. Seo),조정대(J. D. Jho),박상진(S. J. Park) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This paper presents a novel energy recoverable hydrostatic pressure exchanger to apply the sea water desalination equipments. In a reverse osmosis (RO) system for desalting sea water, more than 70 percent of the supplied sea water (brines) which were impassable RO membrane are bypassed, resulting in a high energy losses. In this paper, the hydrostatic pressure exchanger which consists of a embedded water hydraulic motor and water hydraulic pump was proposed and investigated in order to recover the energy of the bypassed brines. The pressurized brines are supplied to the embedded water hydraulic motor as power sources and the water hydraulic pump is driven by the output torque of the embedded motor, as a result, the energy of the bypassed brines can be recovered. To examined the optimal volumetric displacement of the embedded water hydraulic motor, the simulation model was constructed using the AMESim<SUP>®</SUP> commercial software. Through simulation results, the feasibility of energy recovery effect on the proposed hydrostatic pressure exchanger was investigated.
연료전지 Stack Cooling을 위한 압전 공진펌프 설계에 관한 연구
함영복(Y. B. Ham),송종진(J. J. Song),박중호(J. H. Park),안국영(K. Y. Ahn) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In the stack cooling of household fuel cell system(1kW), cooling water pump has been demanded for compact size, low power consumption and constant delivery-performance of the cooling water. To obtain sufficient performance for practical application in above-mentioned area, in this paper, we studied on piston pump using multi-layer PZT actuator(5mm×5mm×18mm). The piston pump used a multi-layer PZT(16㎛ displacement at 100 Vpp) as a reciprocating motion actuator and structure producing resonance to amplify the displacement of a moving piston. The pump composed of two springs and the piston that could be supported a multi-layer PZT. We also decided the mass of moving parts, the stiffness coefficient of two springs with simulation. In this simulation, we predicted the resonant displacement and frequency of the pump. Then, based on the obtained results, without a mechanical amplification, we could make a large displacement.