4. One turbomachine per absorber/receiver allows a power module to be shut down for maintenance or repair without affecting the operation of other turbomachines. 5. Primary radiator fluid distribution line and manifold requirements are reduced. 6. Integration into a shallow, planar, modular structure is allowed. 7. Smaller more manageable components are used. 8. ''Boot-strap" startup is allowed with small start up energy storage requirements. The disadvantages of a small module include: 1. Weight-to-power ratios are higher. 2. There is a lower Brayton cycle conversion efficiency for a given A T. 3. The small module is incompatible with the two-axis orientable ''flat-facet" concentrator approach. After the baseline was initially established with 544 turbomachine/ absorber modules, an analysis was conducted to study the effect of variations in the number of modules for a 10 GW SPS. There are certain advantages and disadvantages for a small number of modules as shown in the previous list. All of the factors listed were not quantified, but data were generated or obtained for most of the primary items. Factors that were considered include turbomachinery weight and outage time as a function of turbomachine generating capacity. Historical data indicate that the time to repair or perform maintenance for large turbomachines is greater than that of smaller units. Absorber weight was analyzed based on the unit size. Since the radiator requires the same area to dissipate a given amount of heat for small or large radiators, the effect of radiator weight was neglected. Total SPS weight is shown in Figure 7-33 as a function of the number of turbomachines for variations in the number of turbomachines per absorber. The discrete points are indicated by points on the curves for more than one turbomachine per absorber. For example, if there are 40 turbomachines per absorber, the total number of turbomachines will vary in increments of 40 as 40, 80, 120, etc. A preliminary assessment indicates that
RkJQdWJsaXNoZXIy MTU5NjU0Mg==