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Myristic acid를 사용한 축열장판의 열성능 연구
곽희열(H.Y.Kwak),강용혁(Y.H.Kang),전명석(M.S.Jeon),이태규(T.K.Lee),이동규(D.G.Lee),한귀영(G.Y.Han) 한국태양에너지학회 1998 한국태양에너지학회 논문집 Vol.18 No.3
본 논문은 미세캡슐을 함유한 축열장판의 열성능에 관해서 조사였고 기존 시판되고 있는 장판과 비교를 하였다. 상변화물질로는 myristic acid (CH₃(CH₂)_12COOH)를 사용했고 이물질을 PMMA와 왁스로 3중 코팅을 하였고 1~1.5mm인 캡슐로 제조를 하였다. ANSI/ASHRAE를 토대로 하여 열전달 매체로 공기를 사용한 밀폐형 실험장치를 구성하였으며, 공기유량은 오리피스를 통해서 측정된다. 실험에 사용된 두 개의 서로다른 장판(미세캡슐 함유율 중량비 10% 장판, 0% 장판)의 열성능을 평가하기 위해서 서로다른 공기유량에 대해서 방열시 열전달 특성에 관한 실험을 수행하였다.<br/> 실험결과를 보면 방열과정시 미세캡슐 함유율이 10%인 장판의 표면온도는 미세캡슐을 함유하지 않은 장판보다 더 높은 온도를 유지했다. 그리고 장판표면에서의 열전달계수는 미세캡슐을 함유하지 않은 장판과 비교해 볼 때 미세캡슐을 함유한 장판에서 더 높게 나타났다. The thermal performance of a heating board with microencapsualted PCM was investigated and compared to conventional heating board. The employed PCM was the myristic acid <CH₃(CH₂)_12COOH> and was encapsulated by the multiple layers of PMMA and paraffin wax. The size of encapsulated PCM was 1 ~ 1.5mm.<br/> Accoring to ANSI/ASHRAE test procedure, the close-loop test configuration was installed. Air was used as the heat transfer fluid and a calibrated orifice was employed for the measurement of air flow rates. The thermal performance test of two different heating boards (with 10 wt% PCM and without PCM) was conducted for different air flow rates and the heat transfer characteristics during cooling was compared.<br/> The test results showed that the surface temperature of heating board with 10 wt% PCM maintained higher during the cooling process than that of the heating board without PCM and experimentally determined heat transfer coefficient in heating board with PCM showed higher value compared to heating board without PCM.
이지연(G.Y.Lee),손건석(G.S.Son),김대중(D.J.Kim),이용래(Y.R.Lee),이귀영(K.Y.Lee) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
Twelve samples from field-aged catalyst were investigated. The conversion performance was measured in a model gas test. The samples taken from the inlet side of the monolith were more deactivated than the corresponding ones from the outlet. However, samples taken from peripheral positions always showed better performance than samples originating from the center. In order to explain observed variations in activity the total surface area(B.E.T) and poisoning of each sample(EDS) were examined. It was concluded that thermal deactivation was mainly responsible for the difference between peripheral and central position while the poisoning due to S, Pb and P had the largest effect on the inlet samples.<br/>
[論文] 흡기다기관 시스템의 구조진동 저감에 대한 연구
윤성호(S.H.Yoon),이귀영(K.Y.Lee) 한국자동차공학회 1992 오토저널 Vol.14 No.5
Vibration of intake manifold is important as it could worsen the noise levels radiated from surface itself and support bracket, and it eventually leads to the failures of a Throttle Position Sensor and an Idle Air Control Valve. In this study, structural modification method is proposed to reduce structural vibration of an intake manifold system. At first, vibration problems are identified through tests on a running engine. Then modal data acquired by modal testing and finite element analysis are helpful to understand vibration mechanism of the system, and used as the design guide when structural modifications are attempted. After the system model is validated by comparison of the modal data obtained from analysis and experiment, iterative calculations are performed to find optimized structure of the system by finite element analysis. As a result, a newly designed plenum bracket is suggested in such a way that the intake manifold is stiffened, and that design of the support bracket is changed in terms of bolting position, thickness, shape, and minimum weight increase. Finally, it is shown that a new design achieves a significant reduction of vibration of an intake manifold system and it is confirmed by tests on a running engine.