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RISS 인기검색어
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- 저자 : 정남조(N. J. Jeong) (검색결과 3 건)
- 무료
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수냉각에 의한 실리콘계열 Photovoltaic 모듈의 출력향상 장기 실증실험
유상필(S. Phil. Yu),김이현(E. H. Kim),정성대(S. D. Jeong),서용석(Y. S. Seo),정남조(N. J. Jeong) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.6
The module of solar photovoltaic power generator of crystalline silicon shows about a 0.5% decrease in output when the temperature increases 1℃ because of the change of electromotive force by temperature. For this reason, as the amount of the concentrated light increases, the efficiency of development tends to decline since the temperature of the module also increases. Therefore, the profits of commercial solar photo voltaic power generator plants have been declining. As of cooling systems, water cooler is excellent at the effect of heat transfer, and is a suitable method for increasing the amount of the concentrated light on the surface of the module. We have been experimenting the effect of the increases in the output about the module of solar photovoltaic power generator in crystalline silicon by using the cooling systems over the years. As a result of the experiment, we measured a cooling effect by seasons and the effect of the increases in output quantitatively. In the event of the country, we could get the effect of 10%~15% output and is considered to get the effect of 8%~12% output according to the net profit, except for operational costs.
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실리콘계열 태양광발전 모듈 수냉각에 의한 출력향상 실증실험
유상필(S. Phil. Yu),김이현(E. H. Kim),정성대(S. D. Jeong),정찬희(C. H. Jeong),김근(K. Kim),심영우(Y. W. Shim),서용석(Y. S. Seo),정남조(N. J. Jeong) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
The module of solar photovoltaic power generator of crystalline silicon shows about a 0.5% decrease in output when the temperature increases 1℃ because of the change of electromotive force by temperature. For this reason, as the amount of the concentrated light increases, the efficiency of development tends to decline since the temperature of the module also increases. Therefore, the profits of commercial solar photovoltaic power generator plants have been declining. As of cooling systems, water cooler is excellent at the effect of heat transfer, and is a suitable method for increasing the amount of the concentrated light on the surface of the module. We have been experimenting the effect of the increases in the output about the module of solar photovoltaic power generator in crystalline silicon by using the cooling systems over the years. As a result of the experiment, we measured a cooling effect by seasons and the effect of the increases in output quantitatively. In the event of the country, we could get the effect of 10%~15% output and is considered to get the effect of 8%~12% output according to the net profit, except for operational costs.
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벽과 분무사이의 유동에 대한 저 Reynolds 난류모델의 비교평가
홍기배,유흥선,정남조 중앙대학교 생산공학연구소 1998 생산공학연구소 논문집 Vol.7 No.2
소형 디젤엔진의 발달에 벽과 분무액적과의 상호작용은 공기와 분사연료의 혼합뿐 아니라 연소에 큰 영향을 끼쳐왔다. 본 논문에서는 벽 부근에서 난류가 액적 거동에 미치는 영향을 분석하기 위해서 Yoshizawa의 비등방성 난류 모델과 Reynolds에 의해서 제안된 수정 k-ε 모델을 사용하였다. 또한 Fujimoto등에 의해서 측정된 실험값과 계산된 결과를 비교하였다. 비교 결과 다른 수정 k-ε모델보다 Yoshzawa의 모델이 실험값과 가장 잘 일치하였다. The spray/wall interaction is considered as one of the most important phenomena influencing air-fuel mixing and combustion in the development of compact diesel engine. In this paper we used the Yoshizawa's anisotropic turbulence model and the κ-εmodel modified by Reynolds in order to analyze the effect of turbulence on the drops behavior in the near-wall region and the calculated results are compared with the experimental data of Fujimoto et. al. It can be concluded that the calculated results by Yoshizawa's model rather than those of the modified κ-εmodel agree well the experimental data
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