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I n t e g r a t e d D e s i g n C e n t e r / M I s s I o n D e s I g n L a b o r a t o r y N A S A G O D D A R D S P A C E F L I G H T C E N T E R Do.

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Presentation on theme: "I n t e g r a t e d D e s i g n C e n t e r / M I s s I o n D e s I g n L a b o r a t o r y N A S A G O D D A R D S P A C E F L I G H T C E N T E R Do."— Presentation transcript:

1 I n t e g r a t e d D e s i g n C e n t e r / M I s s I o n D e s I g n L a b o r a t o r y N A S A G O D D A R D S P A C E F L I G H T C E N T E R Do not distribute this information without permission from Gerry Daelemans X-ray Missions Delta: AXSIO Redux Thermal Kimberly Brown 30 April – 1 May, 2012

2 Thermal, p2 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans Thermal Control Subsystem Summary for S/C Bus Passive S/C radiators for spacecraft components –Thermal coating applied to exterior of closeout panels on anti-sun side –Heat pipes embedded in radiator panels Cho-therm interface material used for box to panel interface (electrically and thermally conductive) except for battery (Nusil interface) Heat pipes transfer heat from boxes (not mounted to radiators) to radiator panels Active heater control via mechanical thermostats (operational and survival) –Primary and redundant heat circuits –Two thermostats in series per circuit –Kapton film heaters attached to components, including propellant tanks –Line heaters on propellant lines and fill-and-drain valves Internal surface coatings has high emittance (Aeroglaze Z307 black paint) Except for radiators, exterior of S/C bus and metering structure is insulated with MLI blankets (15 layers make-up) S/C bus is thermally isolated from FMA (24 mounting points) Back side of portion of solar array that serves as sunshield is insulated with MLI Flight thermistors for telemetry of temperatures

3 Thermal, p3 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans Thermal Control Subsystem Summary for Instruments FMA is cold biased and has active heater control via heater controllers –Primary and redundant heat circuits –Same heater circuits for operational and survival (10ºC lower set point for survival) FMA is thermally isolated from S/C bus Passive radiators for XMS and XGS components –Radiators shaded from sun –Heat pipes isothermalize radiator panels, except for XGS CCD radiator Heat pipes transfer heat from components to radiator panels, except for XGS CCDs Active heater control via mechanical thermostats (survival mode) –Primary and redundant heat circuits –Two thermostats in series per circuit –Kapton film heaters attached to components Heat pipes and backside of radiators are insulated with MLI blankets (15 layers make-up) Flight thermistors for telemetry of temperatures

4 Thermal, p4 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans S/C Bus Thermal Control Subsystem Functional Block Diagram Battery (Li-Ion) Thermostatically controlled heaters Avionics Comm System MLI Radiators RW RWE Gyro Thrusters PSE Radiators Reject Waste Heat to Space FMA Propellant Tanks, Lines and Fill- and-Drain Valves RW RWE

5 Thermal, p5 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans Orbit Thermal and Charged Particle Environment L2 provides excellent thermal environment for passive (radiative) cooling –Earthshine and moonshine negligible Thermal disturbances –Sun angle changes due to ±10º roll and ±45º pitch –Seasonal variation of solar flux Charged particles environment requires electrically conductive thermal coatings –Radiators (anti-sun side) have NS43G yellow paint which has a high emittance (0.9) Flown on WIND, POLAR, MAP, etc. –MLI outer covers have silver conductive composite coating (ITO/SiOx/Al2O3/Ag) which has a low absorptance (0.08 at BOL) and high emittance (0.6) Flown on WIND, IMAGE, etc.

6 Thermal, p6 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans Instrument Radiator Sizing Cryocooler (Compressor & Control Electronics) Electronics Boxes XMS Cryocooler Radiator E-Box Radiator Ammonia Heat Pipe (Redundancy Not Shown)

7 Thermal, p7 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans Instrument Radiator Sizing XGS Power (W)IXOAXSIO Option A* AXSIO Option B* Scaled From XGS Total # of signal chains: IXO: 128; AXSIO-A: 64 (total); AXSIO-B: 40 *Option A: 2 pair of 30-deg gratings sectors, 2 x 8-CCD cameras Option B: 1 pair of 45-deg grating sectors, 1 x 10-CCD camera Radiator Cools CCDs to -90 ° C Passively CCD Power Dissipation: 0.1 W each (1.6 W Total) DEA & DPA Power Dissipation: 50 W ( -40 ° C to 50 ° C operating; -55 ° C to 60 ° C survival) CCDs are cold biased and trim heaters maintain temperature stable Ethane heat pipes isothermalize CCDs Ammonia Heat Pipe Transport Heat from DEA & DPA to Remote Radiator Instrument shown will be scaled down from 32 to 16 CCDs

8 Thermal, p8 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans XGS CCD Parasitic Heat Load Number of Conductors per Ribbon40 Number of Ribbons16 Conductor MaterialStainless Steel 316 Conductor Size28 AWG Conductor Diameter mm Conductor Length0.5 m Thermal Conductivity of Conductor16 Wm -1 K -1 at -50ºC DEA temperature20ºC FPA Temperature-120ºC Heat transfer by DEA harness to FPA0.230 W Number of heater circuits (primary and redundant) 2 Number of conductors4 Conductor MaterialCopper Conductor Size22 AWG Conductor Diameter0.644 mm Conductor Length0.5 m Thermal Conductivity of Conductor400 Wm -1 K -1 at -50ºC DPA temperature20ºC FPA Temperature-120ºC Heat transfer by heater harness to FPA W Number of heater controller temperature sensors (primary and redundant)2 Number of flight temperature telemetry sensors for FPA, paddle and radiator (instrument and S/C)12 Number of conductors28 Conductor MaterialPhosphor-Bronze Conductor Size32 AWG Conductor Diameter mm Conductor Length0.5 m Thermal Conductivity of Conductor65 Wm -1 K -1 DPA temperature20ºC FPA Temperature-90ºC Heat transfer by temperature sensor harness to FPA0.020 W CCD Radiator Heat Rejection: 1.6 W W = 2 W (2.6 W after adding 30% contingency)

9 Thermal, p9 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans Instrument Power Dissipation Summary Power Dissipation (W) With 30% Contingency XMS Electronics Boxes XGS DEA & DPA5065 XMS Cryocooler One radiator for cryocooler (compressor and control electronics) and one radiator for XMS electronics boxes and XGS DEA and DPA

10 Thermal, p10 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans Radiator and Heat Pipe Orientation Cryocooler compressor motor mount and control electronics located slightly below radiator –Allows cryocooler CCHP operate in reflux mode to overcome gravity problem in ground testing CCHPs transfer heat from electronics boxes to radiator –CCHP attached to exterior of components (IceSat GLAS heritage) –Multiple CCHPs provides sufficient heat transport capacity and redundancy cm diameter ammonia pipe; 1372 W-m limit 1.27 cm diameter: 152 W-m limit –Radiators slightly above CCHP evaporators to allow CCHP operate in reflux mode in ground testing

11 Thermal, p11 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans Instrument Survival Heater Circuits Survival heaters and thermostats attached to exterior of electronics boxes and cryocooler motor mount –Set point of primary heater circuit thermostats is 3ºC larger than redundant heater circuit –Powered by S/C bus directly ControlPrimary CircuitsRedundant Circuits XMS Electronics BoxesMechanical Thermostats 16 XMS Cryocooler (Compressor and Control Electronics) Mechanical Thermostats 22 XGS DEA & DPAMechanical Thermostats 22 XGS CCDMechanical Thermostats 11 Total22

12 Thermal, p12 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans FMA Thermal Requirement Mirror segment temperature gradient requirement depends on gradient topology Rule of thumb is 20°C±0.5 ° C Recent IXO STOP analysis has a ± 0.1 ° C goal

13 Thermal, p13 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans FMA Thermal Design FMA is cold biased Active heater control maintain mirror segment temperature stable and meets thermal gradient requirement Heater locations –Conductive portion of thermal pre-collimator –Exterior of module walls –Fore section of metering structure Non-conductive portion of thermal pre-collimator minimizes heater power Sunshield prevents direct solar impingement on FMA FMA thermally isolated from S/C bus

14 Thermal, p14 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans FMA Heater Locations Conductive Portion of Pre-collimator Non-Conductive Portion of Pre-collimator Fore Portion of Metering Structure Exterior

15 Thermal, p15 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans S/C Bus Power Dissipation Nominal Average (W) Nominal Average with 30% Contingency (W) PSE C&DH ACS6281 Propulsion*56.5 Data Systems4457 Total372484** Safehold (W) Safehold with 30% Contingency (W) PSE83108 C&DH2938 ACS6078 Propulsion56.5 Data Systems4457 Total Launch (W) Launch with 30% Contingency (W) PSE4356 C&DH2938 ACS2335 Propulsion56.5 Data Systems00 Total *Pressure Transducer **Used for radiator sizing

16 Thermal, p16 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans S/C Bus Thermal Control MLI on Exterior of Metering Structure MLI on Exterior of S/C Bus with Exception of Radiators MLI on Backside of Sunshield Portion of Solar Array Sunshield MLI

17 Thermal, p17 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans S/C Bus Thermal Control MLI on interior to radiatively isolate from FMA CCHP isothermalizes mounting interfaces for FMA (redundancy not shown) CCHP embedded in honeycomb radiator panel

18 Thermal, p18 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans S/C Bus Propulsion Subsystem Thermal Control Heaters, thermostats and MLI to maintain temperature of propellant tanks, lines and valves above 10ºC. Heater circuits have redundancy. Propellant tanks, lines and valves are thermally isolated from S/C bus structure Cat-bed heaters commanded to heat reactors on prior to firing Aluminum tape spreads heat along propellant lines m Diam.

19 Thermal, p19 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans Thermal Model S/C Bus Metering Structure Instrument Radiators S/C Bus Radiators Solar Array XGS CCD Radiator XMS Cryocooler Radiator

20 Thermal, p20 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans Thermal Model Mirror Module Pre-collimator Stray Light Baffle Conductive Portion of Pre- collimator (Heater Controlled)

21 Thermal, p21 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans Summary of Radiator Sizes ComponentsRadiator Area (m 2 )Coating XMS Cryocooler Radiator1.46NS43G XMS Electronics Boxes and XGS DEA/DPA Radiator 3.1NS43G XGS CCD Radiator0.07NS43G S/C Bus Radiator1.45NS43G

22 Thermal, p22 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans Summary of Instrument Survival Heater Power Peak Heater Power (W) Orbital Average Heater Power (W) XMS Electronics Boxes XMS Cryocooler (Compressor and Control Electronics) XGS DEA & DPA3726 XGS CCD1.41 Total960672

23 Thermal, p23 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans Summary of S/C Bus Survival Heater Power Peak Heater Power (W) Orbital Average Heater Power (W) Total142100

24 Thermal, p24 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans Mass Estimates/TRL S/C Components Mass Each (kg)Qty Mass Total (kg)TRL MLI (15-layers) for Metering Structure (71 m2) MLI (15-layers) for S/C Bus (17.7 m2) Heat Pipes (CCHP) Embedded in S/C Closeout Panels (1.2 m long; 1.27 cm diam.) Heat Pipes (CCHPs) for Transpoting Heat from Electronics Boxes to Radiators (1.5 m long; cm diam.) Heat Pipes (CCHPs) for Isothermalizing FMA Mounting Interfaces (6 m long; cm diam.) S/C Bus Radiator Radiator Paint (NS43G silicate; 1.45 m2) Heaters on Propellant Tanks (redundancy included) Heaters on Propellant Lines (redundancy included) Thermostats on Propellant Tanks (redundancy included) Thermostats on Propellant Lines (redundancy included) Thermostats for Survival Heaters -- Honeywell 3100 Series (redundancy included; 8 per box) Survival Heaters (redundancy included; 8 per electronics box or cryocooler) -- Kapton Film 5.5 cm x 6.4 cm MLI (15-layers) for Propellant Tanks and Lines (1.1 m2) MLI on Solar Array Backside (2.4 m sunshield) (7.2 m2; 15-layer) S/C Bus Thermistors for Telemetry

25 Thermal, p25 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans Mass Estimates/TRL S/C Components Mass Each (kg)Qty Mass Total (kg)TRL XMS Cryocooler Radiator (1.46 m2; cm aluminum) XMS Cryocooler Radiator Paint (1.46 m2; NS43G silicate) XMS and XGS Electronics Radiator (3.1 m2; cm aluminum) XMS and XGS Electronics Radiator Paint (3.78 m2; NS43G silicate) XGS CCD Radiator (0.07 m2; cm thick; aluminum) XGS CCD Radiator Paint (0.07 m2; NS43G silicate) Heat Pipes (CCHP) on XMS Electronics (2 m long; cm diam.; aluminum; ammonia)1227 Heat Pipes (CCHP) on XGS Electronics (0.8 m long; cm diam.; aluminum; ammonia) Spreader Heat Pipes (CCHP) on XMS & XGS Electronics Box Radiator (1.3 m long; 1.27 cm diam.) Spreader Heat Pipes (CCHP) on XMS Cryocooler Radiator (1 m long; 1.27 cm diam.) MLI (15-layers) on Cryocooler Radiator Backside (1.46 m2) MLI (15-layers) on XMS & XGS Electronics Radiator Backside (3.1 m2) MLI (15-layers) on XGS CCD Radiator Backside (0.07 m2) MLI (15-layers) Tent for XMS Electronics (5 m2)3139 MLI (15-layers) Tent for XGS Electronics (0.8 m2) XMS & XGS Sunshield MLI (6 m2; 15-layer with Dunmore fabric) Buttons, Velcro and Tape for MLI

26 Thermal, p26 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans Mass Estimates/TRL S/C Components Mass Each (kg)Qty Mass Total (kg)TRL Thermostats for XMS & XGS Electronics Survival Heaters -- Honeywell 3100 Series (redundancy included; 8 per box) Survival Heaters (redundancy included; 8 per electronics box or cryocooler) -- Kapton Film 5.5 cm x 6.4 cm XMS & XGS Thermistors/Platinum RTDs for Telemetry and Heater Control Total

27 Thermal, p27 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans Conclusions and Recommendations S/C bus, XMS and XGS thermal design meets temperature requirements and have sufficient margin Instrument radiators must be above CCHP evaporators to make CCHP testable (in reflux mode) during ground testing STOP analysis is needed to evaluate if FMA thermal design meets thermal-structural distortion requirement Evaluate thermal effect of solar array as sunshield on FMA mirror temperature gradient –If necessary, consider optical solar reflector/ITO (no solar cells) on sunshield portion of solar array

28 Thermal, p28 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans Delta Charts for AXSIO Redux Change in the MEL are the following: Removed mass for –XMS Cryocooler Radiator, Paint, MLI on backside of Radiator –XMS Spreader heat pipes for XMS Cryocooler Raditor –XMS Electronics Radiator, Paint, MLI on backside of Radiator –XMS Electronics MLI Tent –Buttons, Velcro and Tape for MLI (included in MLI weights)

29 Thermal, p29 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans AXSIO Redux MEL AXSIO Redux New MEL includes: –Metering Structure MLI, thermistors –S/C MLI, paints, heaters, thermostats, thermistors –Heat Pipes embedded in S/C closeout panels –Heat Pipes for transporting heat from electronic boxes to radiators –Heat Pipes for isothermalizing FMA mounting interfaces –XGS Electronics MLI tent, heaters, thermistors, thermostats, Radiator, Radiator Paint, MLI on backside of Radiator. –XGS CCD Radiator, Radiator Paint, MLI on backside of Radiator. Sized a Radiator for XGS based on 50 Watts m2 to add in MEL Removed 12 heaters for tanks and lines from MEL (estimate) of how many per tank

30 Thermal, p30 Final Version M i s s i o n D e s i g n L a b o r a t o r y 30 April – 1 May, 2012 X-ray Delta: AXSIO Redux Do not distribute this information without permission from Gerry Daelemans S/C Bus Thermal Control Subsystem Functional Block Diagram Battery (Li-Ion) Thermostatically controlled heaters Avionics Comm System MLI Radiators RW RWE Gyro Thrusters PSE Radiators Reject Waste Heat to Space FMA Propellant Tanks, Lines and Fill- and-Drain Valves RW RWE


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