AAE450 Spring 2009 Lunar Lander Power Systems Thursday March 12 th Adham Fakhry Power Group Lunar Lander Descent Night Thermal

AAE450 Spring 2009 Final Power Systems [Adham Fakhry] [POW] gram LanderMass (kg)Dimensions (m)Cost ($) Solar Cells m 2 250,000 Batteries X X DC-DC Converters X 0.05 X ,000 PCDU (Power Conditions and Distribution unit) X X , kg LanderMass (kg)Dimensions (m)Cost ($) Solar Cells m 2 250,000 Batteries X X DC-DC Converters X 0.05 X ,500 PCDU (Power Conditions and Distribution unit) X X ,000

AAE450 Spring 2009 Final Power Systems for Arbitrary [Adham Fakhry] [POW] 3 Arbitrary LanderMass (kg)Dimensions (m)Cost ($) Solar Cells m 2 250,000 Batteries X X DC-DC Converters X 0.06 X ,000 PCDU (Power Conditions and Distribution unit) X X ,000

AAE450 Spring 2009 Backup Slide 1: Power Available to the Lander [Adham Fakhry] [POW] 4

AAE450 Spring 2009 Backup Slide 2 - Battery Design  Battery is designed for meet three power goals for 100 g Lander: –Delivers 124 W for 250 seconds for operating the Lander engine –Delivers 30 W for 576 seconds of attitude –Delivers 58.4 W for 30 minutes for all communication gear [Adham Fakhry] [POW] 5

AAE450 Spring 2009 Backup Slide 3 - Battery Design  Battery is designed for meet three power goals for 10 kg Lander: –Delivers 150 W for 450 seconds for operating the Lander engine –Delivers 30 W for 900 seconds of attitude –Delivers 58.4 W for 30 minutes for all communication gear [Adham Fakhry] [POW] 6

AAE450 Spring 2009 Backup Slide 4 - Battery Design  Battery is designed for meet three power goals for Arbitrary Lander: –Delivers 275 W for 500 seconds for operating the Lander engine –Delivers 30 W for 900 seconds of attitude –Delivers 58.4 W for 30 minutes for all communication gear [Adham Fakhry] [POW] 7

AAE450 Spring 2009 Backup Slide 5 – Solar Array Deployment [Adham Fakhry] [POW] m

AAE450 Spring 2009 Backup Slide 6: Solar Array sizing  Solar array Calculations:  Dimensions of Solar cells: –Area of Lander roof = π(1/2)2 = m2 –Solar efficiency = 300 W/m2 –Potential max power = W  Cost of Solar Cells: –Cost of cells per watt = 1000 $/W –Cost of Cells = 235, = $235,600 –Total cost = $235, ,400 (for additional costs) = $250,000 [Adham Fakhry] [POW] 9

AAE450 Spring 2009 Backup Slide 7: Code for battery  %Lunar Lander Arbitrary case  clc  clear  %Dimensions of Lander/Provided by Ryan Nelson  %du = ; %Upper diameter of lander  %dl =; %Lower diameter of Lander  %h=; %Height of Lander  %SA = ; %Surface Area of Lander   %Solar cells/Data taken from Ian Megginis and from Spectrolabs  mass_density = 2.06; %Mass denisty in kg/m^2  cost_density = 1000; %Cost density in $/W  power_density = 330; %Power density in W/m^2   %area = pi*((du-.2)/2)^2; %Area of Solar Cells in m^2  %mass = area*mass_density; %Mass of solar cells in kg  %power = power_density*area; %Maximum power generated by solar cells in W  %cost = power*cost_density; %Cost of solar cells in $   %Batteries  %Usages are calculated to determine the size needed for battery  %Propulsion  prop_usage = 275;  usage_time_prop = 500*(1/3600); %Usage time in hours for 500 second  w_prop = prop_usage*usage_time_prop; [Adham Fakhry] [POW] 10

AAE450 Spring 2009 Backup Slide 8: Code for battery 2  %Communications  comm_usage = 52.4;  usage_time_comm = 0.5; %Usage time is in hours for 1800 s  w_comm = comm_usage * usage_time_comm;   %Propellant  % k=0.005; %Thermal Conductivity of MLI in W/m-K  % t=200/1000; %Thickness of MLI in m  % dt=280.3; %Temperature change in K  % A=0.97; %Area of tanks in m^2  % fuel_usage = k*A*dt/t; %Power usage need for fuel in W  % usage_time_fuel = 250*(1/3600); %Time fuel requires heat in s  % w_fuel =fuel_usage*usage_time_fuel; %Power need to heat fuel in W-hr  w_fuel = 0;   %Attitude  att_usage = 30; %Power used by coolers in W  usage_time_att = 0.25; %For a period of 900 seconds  w_att = att_usage*usage_time_att; %Watt usage in W-hr   %Total  w_total = w_prop+w_comm+w_fuel+w_att  Amp_hour = w_total/3.6 [Adham Fakhry] [POW] 11

AAE450 Spring 2009 Backup Slide 7: References  References: – – – able.com/corpinfo/Resources/ultraflex.pdfhttp:// able.com/corpinfo/Resources/ultraflex.pdf – – [Adham Fakhry] [POW] 12