experiment the ratio of profit (expected results) to cost was very similar. Furthermore, the experiments are expected to be profitable, i.e. they will reduce the TES development costs by more than they will cost. Conclusions Microgravity experiments are necessary for the development of a solar dynamic space power system with heat of fusion thermal energy storage. Three types of planned microgravity experiments were presented in detail. Their objective is to evaluate all microgravity induced phenomena, which influence performance and lifetime of the heat of fusion storage. The analysis of costs and profit indicated positive results for all three. REFERENCES [1] Solardynamische Energieversorgungssysteme in der Raumfahrt, Schluflbericht, Aug. 1987. BMFT-Auftrag 8603/8. [2] Weingartner, S., Blumenberg, J. & Lindner, F. (1989) Spacelab experiment preparation for heat of fusion storage media analysis, to be published in Zeitschrift fur Flugwissenschafien und Weltraumforschung (ZFW). [3] Blumenberg, J. & Weingartner, S. (1988) Preparation of a D2-Experiment for analyzing the Thermal Properties of Relevant High Temperature Storage Media in Microgravity, IAF-88-211. [4] Kesseli, J., Pollak, T. & Lacy, D.E. (1988) An Experimental Analysis of a Doped Lithium Fluoride Direct Absorption Solar Receiver, 23th IECEC. [5] Tanaka, K., Abe, Y., Takahashi, Y., Kamimoto, M. & Tanatsugu, N. (1988) Latent Thermal Storage for Space Solar Dynamic Power System, 23th IECEC. [6] Tanatsugu, N. (1988) On-Orbit Experiment Plan on Solar Thermodynamic Power System, IAF-88-217. [7] Migra, R.P. (1986) Conceptual Definition of a Technology Development Mission for Advanced Solar Power Systems, NASA-CR-179482, July. [8] Strumpf, H.J., Coombs, M.G., Lacy, D.E. (1988) Advanced Space Solar Dynamic Receivers, 23th IECEC.
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