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반사경 배치 및 흡수기 형상에 따른 접시형 태양열 집열기의 열손실 해석
서주현(Joo-Hyun Seo),마대성(Dae-Sung Ma),김용(Yong Kim),강용혁(Yong-Heack Kang),서태범(Tae-Beom Seo) 대한설비공학회 2008 설비공학 논문집 Vol.20 No.1
The radiative heat loss from a receiver of a dish solar collector is numerically investigated. The dish solar collector considered in this paper consists of a receiver and multi-faceted mirrors. In order to investigate the performance comparison of dish solar collectors, six different mirror arrays and four different receivers are considered. A parabolic- shaped perfect mirror of which diameter is 1.40 m is considered as the reference for the mirror arrays. The other mirror arrays which consist of twelve identical parabolic-shaped mirror facets of which diameter are 0.405 m are suggested for comparison. Their reflecting areas, which are 1.545 ㎡, are the same. Four different receiver shapes are a conical, a dome, a cylindrical, and a unicorn type. The radiative properties of the mirror surfaces and the receiver surfaces may vary the thermal performance of the dish solar collector so that various surface properties are considered. In order to calculate the radiative heat loss in the receiver, two kinds of methods are used. The Net Radiation Method that is based on the radiation heat balance on the surface is used to calculate the radiation heat transfer rate from the inside surface of the receiver to the environment. The Monte-Carlo Method that is the statistical approach is adopted to predict the radiation heat transfer rate from the reflector to the receiver. The collector efficiency is defined as the results of the optical efficiency and the receiver efficiency. Based on the calculation, the unicorn type has the best performance in receiver shapes and the STAR has the best performance in mirror arrays except the perfect mirror.
서주현(Seo Joo-Hyun),마대성(Ma Dae-Sung),김용(Kim Yong),서태범(Seo Tae-Beom),한귀영(Han Gui-Young) 한국태양에너지학회 2007 한국태양에너지학회 논문집 Vol.27 No.4
The 5㎾t dish solar collector is designed and the preliminary performance test for this is carried out. The diameter of the parabolic dish is 3.2 m, and its focal length is 2 m. It consists of 10 small reflectors which have their own curvatures, and the effective reflecting area is 5.9 ㎡, and the rim angle of the dish is 43.85°. The reflectivity of reflectors is 0.95, and the thermal capacity of the system is about 5 ㎾ thermal. The aperture diameter of the cylindrical-shape receiver which is made of stainless steel is 100 ㎜, and the height is 210 ㎜. A quartz window is installed at the receiver aperture to minimize the convective heat loss and prevent air leakage. In order to increase the heat transfer area, porous materials (nickel-alloy) are inserted into the receiver. Air flows into the upper part of the receiver which is the opposite side of the aperture. After the air flows through the inside of the receiver, that goes out of the receiver through 3 exits which are located near the aperture. The volumetric flow rates of air are varied from 600 to 1200 L/min. The results show that the system efficiency and receiver efficiency increase as the volume flow rate increases.
서주현(Joo-Hyun Seo),이주한(Ju-Han Lee),서태범(Tae-Beom Seo),강용혁(Yong-Heack Kang) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The thermal performance of the air receiver filled with porous material for 5㎾t dish solar collector installed in Inha University, Korea, is experimentally investigated. The diameter of the parabolic dish is 3.2 m, and its focal length is 2 m. It consists of 10 small pieces of glasses which have their own curvatures, and the effective reflecting area is 5.9 ㎡. The reflectivity of the glass is 0.95, and the thermal capacity of the system is about 5 ㎾ thermal. The aperture diameter of the cylindrical-shape receiver which is made of stainless steel is 100 ㎜, and the height is 210 ㎜. A quartz window is installed at the receiver aperture to minimize the convective heat loss and prevent air leakages. In order to increase the heat transfer area, porous material (nickel-alloy) is inserted into the receiver. 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. The volumetric flow rates of air are varied from 600 to 1200 L/min. The thermal efficiency of the receiver ranges from 82% - 92% depending upon the flow rate. The results show that the system efficiency and receiver efficiency increase as the volume flow rate increases as expected. These results from the experiment will be useful for the applications to air heating receivers and solar reactors.
반사경 배치 및 흡수기 형상에 따른 접시형 태양열 집열기의 복사 열손실 해석
서주현(Seo Joo-Hyun),마대성(Ma Dae-Sung),김용(Kim Yong),강용혁(Kang Yong-Heack),서태범(Seo Tae-Beom) 한국태양에너지학회 2007 한국태양에너지학회 학술대회논문집 Vol.- No.-
The radiative heat loss from a receiver of a dish solar collector is numerically investigated. The dish solar collector considered in this paper consists of a receiver and multi-faceted mirrors. In order to investigate the performance comparison of dish solar collectors, six different mirror arrays and four different receivers are considered. A parabolic-shaped perfect mirror of which diameter is 1.40 m is considered as the reference for the mirror arrays. The other mirror arrays which consist of twelve identical parabolic-shaped mirror facets of which diameter are 0.405 m are suggested for comparison. Their reflecting areas, which are 1.545 ㎡, are the same. Four different receiver shapes are a conical, a dome, a cylindrical, and a unicorn type. The radiative properties of the mirror surfaces and the receiver surfaces can vary the thermal performance of the dish solar collector so that various surface properties are considered. The Net Radiation Method that is based on the radiation heat balance on the surface is used to calculate the radiation heat transfer rate from the inside surface of the receiver to the environment. The Monte-Carlo method that is the statistical approach is adopted to predict the radiation heat transfer rate from the reflector to the receiver. Based on the calculation, the unicorn type has the best performance in receiver shapes and the STAR has the best performance in mirror arrays except the perfect mirror.
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.