The Power Technology Division of the Lewis Research Center is presently structuring a program to further evaluate HTSC for space power systems applications. The previous Lewis-Argonne studies indicated that, for space power systems applications, the HTSC technology must be evaluated in a ‘total systems context' to truly assess its benefits both from the viewpoint of system architecture and operations and this will be the approach of the Lewis Power Technology Division Program. This paper will discuss some preliminary results of previous studies, the Lewis program, its thrusts, and its intended outputs and give general insights on the anticipated impact of HTSC for space power applications. (Paper number IAF- ICOSP89-3-7.) 4. SOLAR DYNAMIC SYSTEMS & TECHNOLOGY 4-2. Study on Parabolic Solar Concentrators Sumio Kato', Hiroshi Oda', Yasuhiro Takeshita', Yoshinori Sakai', Tatsusaburo Nakamura1 & Osamu Muragishi1 'Aircraft Engineering Division, Kawasaki Heavy Industries Ltd., 1 Kawasaki-cho, Kakamigahara City, Gifu 504, Japan; "Technical Institute, Kawasaki Heavy Industries Ltd., 1-1 Kawasaki-cho, Akashi City, Hyogo 673, Japan. Conceptual design of solar concentrators, which are key elements of Solar Dynamic Power Systems (SDPS), was carried out, and a mirror segment model which is the key element of the concentrator was fabricated and tested. Basic assumptions in the design are as follows: the Closed Brayton Cycle System is employed. The SDPS is launched by H-II or STS. Power output levels are 1.5 kW, 10 kW and 15 kW. Based on trade studies, reflector type and offset configuration were selected. Each concentrator consists of many units. The parabolic surface of the units is approximated by spherical surfaced mirror segments. The collector error requirement was set based on the collector efficiency requirement, and it was shared into each error source; angular spread of the sunlight, slope errors, etc. The optical analysis of divided parabolic concentrator constructed with spherical surfaced segments was conducted in order to examine the relation between the number of divisions, the radius of curvature of the segments, the sun image size on the receiver, etc. The reflected sunlight flux distributions on the receiver from each segment were calculated by the ray-tracing method using computer. Based on the spherical slope error requirement and the analysis mentioned above, requirements concerning the number of divisions and so on were set. Three kinds of units, each of which consists of triangular, square, or hexagonal segments, were compared and discussed. Many kinds of mirror segment constructions were investigated and two kinds of honeycomb type constructions (glass specular surface type and resin specular surface type) were selected as candidates. The hexagonal mirror was fabricated based on the results of the study, and know-how about the materials, structure and fabrication process was obtained. Performance data of the mirror were also obtained. With these studies and the mirror fabrication test results, feasibility of the concentrator development was confirmed. (Paper number IAF-ICOSP89-4-2.) 4-3. Proposal of Gr/Ep Mirror without Glass Base for Solar Collector Hideo Morita', Masahito Oguma', Norihiro Inutake' & Nobuhiro Tanatsugu1 'Ishikawajima-Harima Heavy Industries Co. Ltd., Research Institute, Shinnakahara-cho, Isogo- ku, Yokohama 235, Japan; "Institute of Space and Astronautical Science, Yoshinodai 3-1-1, Sagamihara-shi, Kanagawa 229, Japan.
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