while thermal stress is observed with the aid of an optical instrument through windows. The detailed design has been completed and construction is nearly done. Conclusion Two new LTES concepts to be applied to CBC space solar receivers have been discussed. The addition of carbon fabric fins inside the containment canister not only enhances heat transfer but also relaxes mechanical stress caused by volumetric change of the PCM. This method offers the potential of reducing the specific mass of the receiver by about 20%. For an advanced type of space solar receiver, composite materials with silicon carbide and fluoride salts (LiF, MgF2) have been developed. Thermal stability and thermal properties have been confirmed experimentally. These composite uncanistered LTES systems are expected to be used in higher temperature applications. Receivers using SiC/LiF or SiC/MgF2 composite materials as the LTES have the possibility of achieving specific masses of approximately 50 kg/kWe or 40 kg/kWe, respectively. This results in an expected weight reduction of 30-50% as compared to receivers using conventional canisters. REFERENCES [1] Boyle R.V., Coombs, M.G. & Kudija, C.T. (1988) Solar dynamic power option for the space station, Proceedings of the 23rd IECEC, Vol. 3, p. 319. [2] Kesseli, J.B. & Lacy D.E. (1987) Advanced solar receiver conceptual design study, Proceedings of the 22nd IECEC, Vol. 1, p. 162. [3] Tanaka, K., Kanari, K., Kamimoto, M., Abe, Y., Takahashi, Y., Sakamoto, R. & Ozawa, T. (1987) Preliminary examination of latent heat-transfer energy storage materials; third report, screening of eutectic mixtures over a range from 200°C to 1500°C, Bulletin of the Electrotechnical Laboratory, 51(7), p. 19 (in Japanese). [4] Tanaka, K., Abe, Y., Takahashi, Y., Kamimoto, M. & Tanatsugu, N. (1988) Latent thermal storage for solar dynamic power system, Proceedings of the 23rd IECEC, Vol. 3, p. 63. [5] Takahashi, Y., Abe, Y., Sakamoto, R., Tanaka, K., Kanari, K. & Kamimoto, M. High temperature fluoride composites for latent thermal storage in advanced space solar dynamic power system, Proceedings of the 24th IECEC, August, Washington, DC. IEEE. [6] Takahashi, Y., Abe, Y., Tanaka, K. & Kamimoto, M. (1989) Latent heat of thermal storage materials for space use at high temperature, Proceedings of the 2nd ATPC, September, Sapporo, Japan. [7] Lichtenecker, K. (1926) The electrical conductivity of periodic and random aggregates, Phys. Z., 27, p. 115. [8] Strumpf, H.J., Coombs, M.G. & Lacy, D.E. (1988) Advanced space solar receivers, Proceedings of the 23rd IECEC, July, Denver, CO, Vol. 3, p. 357, ASME.
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