Abstract: NASDA is progressing with the development of the third stage H-I rocket motor and the apogee boost motor -For geosynchronous satellites in 550 kg class. H--I rocket will be launched at Tanegashima in the summer of 1987. Although N-I and N-II rockets use Thiokol's motors, the upper stage motors ATTACHMENT : developed in Japan can be provided for the H-I and the later rockets. This paper mainly presents an outline of the third stage motor and the schedule of the development program. Title: Space solar electric power generation system with Stirling engine Source: Proceedings of the Second ISAS Space Energy Symposium, Institute of Space & Astronautical Science, 4-6-1 Komaba, Meguro-ku, Tokyo 153, Japan, Dec. 13-14, 1982. (Paper No. 11-3) Authors: Tanatsugu, Nobuhiro; <Institute of Space and Astronautical Science> Date: 12-13-82 Classification: u Keywords: space energy conversion, alternative systems, solar cells Abstract: Major electric power systems currently used in various space applications utilize the solar cell, which converts directly a solar energy to an electric energy by means of the photovoltaic effect. A solar cell has higher reliablity and safety compared with other options because it does not have any ATTACHMENT : moving parts in the conversion mechanisms. A solar cell power system, however, needs to extend a large area toward the sun due to its low conversion efficiency. Current production type silicon solar cells have initial (i.e., unirradiated) efficiencies of between 10 and 13 percent, but a further improvement of efficiency in the future seems to be to some little extent, taking into consideration that the theoretical 1y possible efficiency of them is now estimated to be as high as 22 percent Cl J. In the present paper, the compact solar electric power generation system with a heat engine, which has higher conversion efficiency, is discussed as an alternative to a solar cell power system. A power system with a heat engine such as the Stirling engine can attain a conversion efficiency of more than twice that of a solar cell power system. Title: Introductory note on the 10 MW SPS conceptual study Source: Proceedings of the Second ISAS Space Energy Symposium, Institute of Space & Astronautical Science, 4-6-1 Komaba, Meguro-ku, Tokyo 153, Japan, Dec. 13-14, 1982. (Paper No. 11-4) Authors: Nagatomo, Makoto; <Institute of Space and Astronautical Science> Date: 12-13-82 Classification: u Keywords: prototype systems Abstract: The necessity of an operational test of a subscale model of SPS prior to construction of an operational one has been discussed in the previous Space Energy Symposium (1). The purpose of this study is to provide a realistic concept of an intermediate test model between operational SPS and the presently ATTACHMENT : conceived space station using a moderate size of SPS. This is introduction to the major subsystem study, which will be included as Paper No. II-4 thru -11 of this proceedings.
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