(HA) is explained by the necessity of power supply of the consumers on the eclipse parts of the space vehicle trajectory. A greater solar power concentrator surface provides a heat rejection surface at low financial and weight costs. It gives the opportunity to decrease low cycle temperature and consequently to increase the thermodynamic efficiency of the plant. A number of problems should be solved when such power systems are being worked out. • creation of new materials for the concentrator covering, light absorbing materials for a heat receiver and their approbation in outer space conditions; • compatibility of construction materials with phase change materials; • designing of reliable rotor bearing to provide the required life time. In heat transfer: • distribution of radiant heat flux along the real receiver construction is necessary to avoid construction elements burnout; • heat transfer of semitransparent phase change material; • performance both of separate units and the whole power system in non - stationary operating conditions etc. There are a number of difficulties connected with the specific features of such power systems one of which is the necessity of the accurate orientation to the Sun (1 to 1.5 degree). We think that the creation of such power systems with the power up to 1 MW within the framework of SPS is not difficult in principle. A number of problems will be eliminated such as the provision of high efficiency of the turbine and compressor and provision for the high degree of recuperation. The presence of gyroscopic moment in this case may become a stabilizing factor for the SPS. In the CIS at present there are 2 designs of the dynamic power system with the Brayton cycle of the operation with electric power of 3.5 and 10 kW respectively. The energy system with the power of 3.5 kW is being developed by the "Foton" experimental laboratory at the Dniepropetrovsk University. The results of the preliminary development of this power system are presented in my report for SPS'91. The energy system with the power of 10 kW is being developed by the working group headed by Semenov V.F. The working group headed by Semyonov V. L. in Moscow developed the 5.5 kW power plant, which has an operation time of 10000 hours. The efficiency of the turbine and the compressor equals to 0.8 and 0.87 respectively. The design group at Dniepropetrovsk State University, "Foton", has created the real designs of a concentrator and a heat receiver. They are being tested at present. Following characteristics have been achieved: • number of cycles = 250; • maximum temperature = 1150K; • reflection coefficient = 0.92. • At present selected performances for the 10 kW power system are as follows: turbine efficiency and compressor efficiency are 0.9 and 0.85 respectively; • rotation frequency = 24000 heat storage cycles per minute;
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