AAE450 Senior Spacecraft Design Project Aquarius Rogge - 1 Courtney Rogge Week 6: February 22 nd, 2007 Power Group Nuclear Power Capabilities TV Nuclear Power System Earth Taxi, Mars Taxi, Electric Propulsion Systems, Sample Return, Mars Crawler

AAE450 Senior Spacecraft Design Project Aquarius Rogge - 2 Transfer Vehicle Power Supply Edwin Sayre, et al, Ref. 1 Solution from code ReactorSizing.m by Courtney Rogge

AAE450 Senior Spacecraft Design Project Aquarius Rogge - 3 Thermoelectric (TE) Nuclear Power System Donut Shield Reactor Thermoelectric Converter Heat Pipe Based on concept (component placement) by Edwin Sayre, et al, Ref. 1

AAE450 Senior Spacecraft Design Project Aquarius Rogge - 4 Backup Slides Thermoelectric Nuclear Power System (TE NPS)

AAE450 Senior Spacecraft Design Project Aquarius Rogge - 5 TE NPS Mass vs Power

AAE450 Senior Spacecraft Design Project Aquarius Rogge - 6 TE NPS Volume vs Power

AAE450 Senior Spacecraft Design Project Aquarius Rogge - 7 TE NPS Characteristics Assumptions for basic reactor characteristics based on Edwin Sayre, et al, Ref.1 & Alan Marriot, et al, Ref 2 & Kenneth Metcalf, et al, Ref 4

AAE450 Senior Spacecraft Design Project Aquarius Rogge - 8 TE NPS Fuel and Power These equations yield fuel mass and thermal output needed by the reactor.

AAE450 Senior Spacecraft Design Project Aquarius Rogge - 9 TE NPS Converter Sizing Area of each thermoelectric converter is fixed. Calculate conversion capacity of each unit, then the number of units required. TE units modeled as circular. Overall circumference of the TE converter system is based on summing the diameters of required TE converter units.

AAE450 Senior Spacecraft Design Project Aquarius Rogge - 10 TE NPS Heat Pipe Sizing Diameter, thickness, length, and heat capacity of each heat pipe fixed. Calculate total area needed to reject waste heat. Determine number of heat pipes required for heat rejection. Total circumference based on summing diameters of all required heat pipes. Heat pipes assumed to be made from Titanium (Ti).

AAE450 Senior Spacecraft Design Project Aquarius Rogge - 11 TE Nuclear Power System Total mass is the sum of all component masses (core, TE converter, converter shield, heat pipe radiation) Total volume is sum of all components Total length is sum of all component lengths –Assumed configuration is stacked

AAE450 Senior Spacecraft Design Project Aquarius Rogge - 12 TE NPS Continuing Work Optimize Configuration –Decrease overall length –Decrease total diameter of converter and heat pipe systems Continue to verify and update assumptions as necessary

AAE450 Senior Spacecraft Design Project Aquarius Rogge - 13 TE Nuclear Power System Technological Readiness: ready by 2020 Advantages –Less edge wear on TE converter than flat plate –No moving parts in converter and radiator systems Disadvantages –Low efficiency

AAE450 Senior Spacecraft Design Project Aquarius Rogge )Sayre, Edwin D., Sam Vaidyanathan, “A Solid Core Heatpipe Reactor with Cylindrical Thermoelectric Converter Modules”, Space Technology and Applications International Forum (STAIF 2006), edited by M.S. El-Genk, AIP, pp )Marriot, Alan, Toshio Fujita, “Evolution of SP-100 System Designs”, JPL, year(after 1992). 3)Lamarsh, John R., Anthony J. Barrata, Introduction to Nuclear Engineering, Third Ed.. Prentice Hall, New Jersey, )Metcalf, Kenneth J., “Lunar PMAD Technology Assessment”, NASA, )Ben Collins, Nuclear Engineering Senior, Purdue University. References