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CFD를 이용한 접시형 태양열 집열기의 Transient 열전달 성능 해석
오상준(Oh, Sang-June),이주한(Lee, Ju-Han),서주현(Seo, Joo-Hyun),이진규(Lee, Jin-Gyu),조현석(Cho, Hyun-Seok),서태범(Seo, Tae-Beom) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
A numerical and experimental studies are carried out to investigate the transient heat transfer characteristics of 5kWth dish type solar air receiver. Measured solar radiation and temperatures at several different locations are used as boundary conditions for numerical simulation. Many parameters' effects (reflectivity of the reflector, the thermal conductivity of the receiver body, transmissivity of the quartz window, etc.) on the thermal performance are investigated. Discrete Transfer Method is used to calculate the radiation heat exchange in the receiver. A transient heat transfer model is developed and the rate of radiation, convection and conduction heat transfer are calculated. Comparing the experimental and numerical results, good agreement is obtained. Using the numerical model, the transient heat transfer characteristics of volumetric air receiver for dish type solar thermal systems are known and the transient thermal performance of the receiver can be estimated.
CFD를 이용한 접시형 태양열 집열기의 과도 열전달 모델 해석
오상준(Oh, Sang-June),이주한(Lee, Ju-Han),서주현(Seo, Joo-Hyun),이진규(Lee, Jin-Gyu),조현석(Cho, Hyun-Seok),서태범(Seo, Tae-Beom) 한국신재생에너지학회 2008 신재생에너지 Vol.4 No.4
A numerical and experimental studies are carried out to investigate the transient heat transfer characteristics of 5kWth dish type solar air receiver. Measured solar radiation and temperatures at several different locations are used as boundary conditions for numerical a. Many parameters' effects (reflectivity of the reflector, the thermal conductivity of the receiver body, transmissivity of the quartz window, etc.) on the thermal performance are investigated. Discrete Transfer Method is used to calculate the radiation heat exchange in the receiver. A transient heat transfer model is developed and the rate of radiation, convection and conduction heat transfer are calculated. Comparing of the experimental and the numerical results, results of both are in good agreement. Using the numerical model, the transient heat transfer characteristics of volumetric air receiver for dish type solar thermal systems are known and the transient thermal performance of the receiver can be estimated.
접시형 태양열 집광 시스템과 산화세륨 및 페라이트산화물을 이용한 열화학 사이클의 수소생산
권해성(Kwon Hae Sung),오상준(Oh Sang June),서태범(Seo Tae Beom) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3
The two-step water splitting thermochemical cycle is composed of the T-R (Thermal Reduction) and W-D (Water Decomposition) steps. The mechanism of this cycle is oxidation-reduction, which produces hydrogen. The reaction temperature necessary for this thermochemical cycle can be achieved by a dish-type solar thermal collector (Inha University, Korea). The purpose of this study is to validate a water splitting device in the field. The device is studied and fabricated by Kodama et al (2010, 2011). The validation results show that the foam device, when loaded with CeO2 powder, was successfully achieved hydrogen production under field conditions. Through this experiment, we can analyze the characteristics of the catalyst and able to determine which is more advantageous thing to produce hydrogen compared with previous experiment that used ferrite-device.
김진호(Jin-Ho Kim),오상준(Sang-June Oh),황경수(Kyung-Su Hwang) 충남대학교 사회과학연구소 2010 사회과학연구 Vol.21 No.2
More recently, there have been various kinds of conflicts on the rise in South Korean society with the advancement of democratization. There is no exception of national security. Lee Myuong-Bak government's pointing out the utility in every spheres of state affairs. In the case of the national security, it's linking to the effect on the people's lives. Becoming the a national project, it's striving to be a great possibility of breaking out the social disputes more than anything else. In this regard, performing the decision making of national security is more complex combining together the internal and external environments. It's difficult to do the national project without resolving the conflicts between the persons concerned. Accordingly, it is becoming the social issues, being deep into the unreasonable terms. Such as;s yeongtaek Dislocation Plan, Jeju Naval Base Construction Plan. In the process of these cases, there are emerging the traits; cleavages between the progressives and conservatives. This situation has been getting worse and worse for the cause of the division of territory with ideological disputes among civic groups. On the contrary, we try to review a different view of these cases. We're dealing with the case of Second Lotte World Construction. Here is inherent in new facts; security-consevative vs. economy-conservative. This is the new type of internal ideological conflicts. And so, we examine the cause, process, and the solution of the conflicts behind the construction of second Lotte World using the content analysis for case study with the secondary sources including articles, magazines, newapapers.
접시형 태양열 집광 시스템과 산화세륨 및 페라이트산화물을 이용한 열화학 사이클의 수소생산
권해성(Kwon, Hae Sung),김동연(Kim, Dong Yeon),오상준(Oh, Sang June),서태범(Seo, Tae Beom) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.11
The two-step water splitting thermochemical cycle is composed of the T-R (Thermal Reduction) and W-D (Water Decomposition) steps. The mechanism of this cycle is oxidation-reduction, which produces hydrogen. The reaction temperature necessary for this thermochemical cycle can be achieved by a dish-type solar thermal collector (Inha University, Korea). The purpose of this study is to validate a water splitting device in the field. The device is studied and fabricated by Kodama et al (2010, 2011). The validation results show that the foam device, when loaded with CeO2 powder, was successfully achieved hydrogen production under field conditions. Through this experiment, we can analyze the characteristics of the catalyst and able to determine which is more advantageous thing to produce hydrogen compared with previous experiment that used ferrite-device.
고온 태양열 2단계 열화학 반응기 형상에 따른 수소 생산량의 변화 연구(Ⅰ)
신예원(Shin Ye-won),오상준(Oh Sang-June),N. Gokon,T. Kodama,서태범(Seo Tae-beom) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
A two step thermochemical cycle includes a T-R(Thermal Reduction)step and W-D(Water Decomposition)step and the mechanism is oxidation/reduction reaction. The react temperature for T-R step is about 2200℃ and for W-D step is about 1000℃. In this study, NiFe₂O₄ and Fe₃O₄ supported on monoclinic ZrO₂ is used to device and Ni powder is help to reduce the T-R step reaction temperature. The experiment performed a field scale with dish type solar heat concentrated system(Inha dish-1, Songdo, Incheon). In this study, hydrogen production is analyzed varying the number of cycles and a sharply fluctuated environment with 2nd reactor. The cycle repeated 5 times, ferrite conversion rate are 4.49~29.97% and hydrogen production rate is 0.19~1.54mmol/g-ferrite. And it perform a basic research for improving a reactor design to increase a hydrogen production and stabilize. For this subject, results of 2nd and 3rd reactor is compared when the cycle is finished.
공기식 흡수기의 유동 방향에 따른 5kW_t급 접시형 태양열 집열기의 열성능 분석
서주현(Seo, Joo-Hyun),강경문(Kang, Kyung-Moon),이주한(Lee, Ju-Han),오상준(Oh, Sang-June),서태범(Seo, Tae-Beom) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
The thermal performance of air receiver with a change of flow direction for dish solar collector. This system is installed and operated in Incheon, Korea. The thermal capacity of the system is about 5 kW thermal. The aperture diameter of the cylindrical-shape receiver which is made of stainless steel is 100 mm, and the height is 210 mm. Experiments are being carried out to investigate the thermal performance variation of the receivers with several design parameters such as the shape of the receiver, the flow directions and the flow rate of air. First, air flows into the upper part of the receiver, which is the opposite side of the aperture. After the air flows through the inside receiver, that goes out of the receiver through 3 exits which are located near the aperture. Second, air flows into the backside of the receiver, Which is the forward side of the aperture. After the air flows through the inside receiver, that goes out of the receiver through 1 exit. The results show that the system efficiency and receiver efficiency increase as the volume flow rate increases as expected.
접시형 고온 태양열 화학 반응기의 열전달 및 수소생산 성능 분석
양승복(Seung-Bok Yang),고만석(Man-Seok Ko),오상준(Sang-June Oh),서태범(Tae-Beom Seo) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
The purpose of this research is to develop the high performance of solar chemical reactor for producing hydrogen by methane reforming reaction with steam. Two shape of chemical reactor is suggested: first type is filled with porous material and second type is spiral type. These reactors is installed on the dish-type thermal system of Inha University, Inha Dish-1. Performance analysis of these two reactors is conducted from getting methane conversion.
수치모델을 이용한 자동차 헤드램프 내부의 습기발생 현상 해석 연구
정영국(Young-Guk Jung),이주한(Ju-Han Lee),오상준(Sang-June Oh),서태범(Tae-Beom Seo) 대한전기학회 2010 전기학회논문지 Vol.59 No.5
Increasing styling features for automotive headlamps speed up the focus of understanding condensation at inner surfaces. Water vapor condensation on the inside surface of the headlamp lens is an essential factor that affects secure front view and headlamp life. One of the headlamps of automobile which is one of the most popular in Korea was chosen for the present analysis. In the basis of the experimental data of automobile given by a manufacturer, boundary conditions were defined and free convection of the air inside the headlamp and radiation from the bulb to the other surfaces are considered. As a result, temperature distribution of the inside surface of the headlamp lens are approximately the same as the experimental result.