Conclusions Characteristics of thermal storage units using composite latent thermal storage materials were obtained from the experimental results of the model storage units and the numerical analyses. The composite materials were made of honeycombed matrix of silicon carbide or spongy matrix of porous carbon impregnated with lithium fluoride (SiC/LiF or C/LiF). The numerical analyses are based on a three dimensional heat transfer model including thermal radiation effects. Conclusions are as follows: (1) Advantages of the composite latent thermal storage materials and bayonet type receivers are confirmed for heat transfer and thermal stress. (2) The SiC/LiF seems to be a good thermal storage material for space solar dynamic power systems. Further optimization of the volume ratio between SiC and LiF is required. (3) The C/LiF shows poor thermal characteristics due to low filled ratio of the composite in the canister. A production method to obtain the higher filled ratio should be developed for practical application. (4) Thermal resistance between composites and canisters should be reduced. Acknowledgments The authors acknowledge Space Power Developing Group of Toshiba Corporation for support on the experiments, Mitubisi Pencil Co., Ltd. for making the spongy matrices of porous carbon, Ibiden Co. Ltd. for making honeycombed matrices of SiC and Sinku-Riko Co. Ltd. for measuring thermal conductivity of the spongy matrices of porous carbon. References [1] Tanaka,K., Kanari.K., Kamimoto,M., Abe,Y., Takahashi,Y., Sakamoto,R. & Ozawa,T. (1987) Preliminary examination of latent heat thermal energy storage materials, 3. Screening of eutectics mixtures over a range from 200'C to 1500'C, Bulletin of the Electrotechnical Laboratory, 51-7, pp.469-483 [2] Inoue,T., Nakagawa,M., Mochida,Y., Ohtomo,F., Shimizu,K., Tanaka,K., Abe,Y., Nomura,0. & Kamimoto,M. (1991) Test facility of thermal storage equipment for space power generation, Proceedings of 26th Intersociety Energy Conversion Engineering Conference, pp.308-312 [3] Nomura,O., Kanari,K., Abe,Y., Tanaka,K. & Kamimoto,M. (1992) Thermal characteristics of solar receiver for space dynamic power generator, 5 th Symposium on Numerical Statics, 314
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