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Study on the Flow Characteristics in the Channel with Corrugated Wall
YongHan Shin(신용한),ZhenHua Jin(김진화),S. Wibowo(위보워),Li XueSong(이설송),HanShik Chung(정한식),HyoMin Jeong(정효민) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
In this paper, presented pressure drop characteristics in a channel of plate heat exchanger by experimental method. Plate Heat Exchanger(PHE) have become popular in chemical, power, food and refrigeration industries due to the efficient heat transfer performances, extremely compact design and flexibility of extend or modify to suit changed duty. In the experiment, test section constructed by two corrugated plates with 60 degree of chevron angle. Consequently, experiments carried out the pressure profile along 15 measure points according to mass flow rate. This results provided to investigate flow characteristics of PHE channel flow that highly turbulent even with low Reynolds number. Moreover, numerical simulation was compared with experimental results and present flow behavior in the test section.
신용한(Yonghan Shin),사이드(S.M. Sayeed-Bin-Asad),전영철(YoungChul Jeon),정한식(Hanshik Chung),정효민(Hyomin Jeong) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
A numerical simulation on the flow field was carried out to improve cylindrical shell with baffle. The steady incompressible 3-D Navier-Stokes solution is obtained with the actual operational condition and geometry of the heat exchanger. The effect of the location of inlet and outlet on the cylindrical shell with baffle is investigated by varying flow rate. The present results show that the pressure drop is dependent on Reynolds number in the inlet area and position of inlet and outlet; i.e., the pressure drop increases with increasing Reynolds number and the pressure drop decreases with increasing angle between baffle cutting part and position of inlet and outlet.
정효민(Hyomin Jeong),신용한(Yonghan Shin),사이드(S.M. Sayeed Bin Asad),박진관(Chenkuan Park),정한식(Hanshik Chung) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
LNG(Liquified Natural Gas) must be vaporized to be used as fuel in the industries, home application and soon. The cold energy generated about latent heat of 120 ㎉/㎏ and 80 kca/㎏ of sensible heat, while the vaporization process. Because air type vaporizer can't effect its vaporization performance properly due to the condensation of moisture in air outside the vaporization of moisture in air outside the vaporizer, 2~3 vaporizers are used alternately. To prevent freezing on the surface of vaporizer and solve the low performance, The heating source of gasification will use the geothermal energy. In this study, as the fundamental investigation to develop the highly efficient LNG vaporizer, When cold energy (Heat Flux : -100, -200, -300 W/m2) is connected to the ground, The soil temperature have been investigated numerically by the unsteady heat conduction equation.
지열 현장 시공 사례 및 경제성 분석에 관한 연구 (PP.463-466)
박진관(ChenKwan Park),정홍도(HongDo Jung),신용한(YongHan Shin),정효민(HyoMin Jeong),정한식(HanShik Chung) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
Renewable energy is growing based on low-carbon green energy Government policies. According to this policy, geothermal energy is highly efficient and environmentally friendly energy which is being expanded nowadays. However, construction companies are generated disorderly but their ability has not been verified due to the poor geothermal facility which was reported in the media. In the process of introducing on Busan region's largest geothermal facility, it was confirmed that thermal efficiency of the underground is close to heat exchanger performance. Therefore the study improving the efficiency of underground heat exchange found progressed. The results showed voids between Borehole and Ground Heat Exchanger should not be raised. And then geothermal facilities were installed very successfully through the principle grouting operation. As compared to the energy consumption on the basis of operating results energy usage was less than any other heat sources.
박진관(ChenKwan Park),정홍도(HongDo Jung),신용한(YongHan Shin),정효민(HyoMin Jeong),정한식(HanShik Chung) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
According to the KEMCO(Korea Energy Management Corporation) reports that the university facilities account for the majority of wasted energy in the domestic building. The reason that a lot of energy to use in university facilities is the university facilities have to use in a lot of energy because of structural problems. More than all, but, the members of the university lack the awareness of energy conservation. Thus, in this paper we focus a discussion on the cases of wasted energy and the methods of energy conservation.