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Extra resources for Advanced Potassium Rankine Power Conversion Sys [space reactor designs]
Example text
ALKASYS calculates generator length, generator outer diameter, volume, and mass based on the following equations. New equations and values based on the recent assessment are shown. The original ALKASYS values are indicated in square brackets. 5/rpm (m) These equations are based on reference designs where the average stator diameter was approximately 34% larger than the rotor diameter. 23 value used in ALKASYS. 34 was selected because it matches the lower– power (95 kWe and 520 kWe) machine data better.
Vertical), and the co-current sodium/potassium flow in these tests vs. the countercurrent flow of ref. 4. 2 Review of Previous Boiler Designs All boiler designs with liquid metals reviewed from the open literature are oncethrough boilers. 3 MWt. Both boilers produced potassium vapor inside the tubes and are heated by sodium or lithium circulated in counter-flow outside the tubes. Helical inserts are required for tube lengths of under 3 m. The 10 MWt boiler requires 130 tubes, 90 in. 92 in. 33 cm) in ID with helical inserts (P/D=2).
The primary selection criteria would be specific creep strength normalized to the turbine inlet temperature. This parameter usually drives the selection of the turbine blade and disc materials toward the tantalum alloys (T-111 or ASTAR) at temperatures above about 1350 K. 35 Fig. 14. Number of turbine stages is driven by maximum allowable tip speed. Using molybdenum or tantalum alloys for moving blades and wheels of a turbine operating in liquid potassium systems that are contained in niobium alloys should not pose any mass transfer problems because they would be exposed primarily to potassium vapor and not liquid.