science floor - lunar and planetary institute · science floor emmrtg discretionary energy for msl...
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~8.5 yrs of constant energy for science operations from the eMMRTG relative to the MSL Mission Design
2 times the energy of the MMRTG per sol at ~5.5 yrs
The eMMRTG still produces 78% of the discretionary energy the MMRTG produced at landing at EODL
MSL used a linear degradation for conservatism; the RTG community typically uses an exponential decay rate for RTG power degradation
Science Floor
eMMRTG Discretionary Energy for MSL
BOL – Beginning Of Life, fueling EDL – Entry, Descent, and Landing EODL – End Of Design Life, 17 yrs from BOL
If MSL had an eMMRTG
Five Take Away Points 1. Increased EODL power, 80-100% more than MMRTG 2. Graceful degradation 3. Quiescent power 4. Operates in vacuum and planetary atmospheres 5. Enhanced RPS Power in a flight-proven package; rugged
David Woerner: JPL/California Institute of Technology [email protected]
Office: 818-393-2000 Cell: 626-497-8451
SKD couples Advanced SKD MMRTG modules
Skutterudite (SKD) materials
Liner changes boost operating temperature
Operating temperature rises from 520C to 600C
enhanced MMRTG
New SKD materials with higher performance and maximum operating temperature than MMRTG TE materials
+ 10% increase in conversion efficiency over MMRTG couples
14% increase in conversion efficiency over MMRTG couples
24% increase in conversion efficiency over MMRTG
MMRTG enhanced MMRTG enhancement BOL Power (W) 122 * ~166 ** 36%
Power at EODL (W) 54 ~109 101%
Degradation Rate *** 4.8% 2.5% ~ 2x
No. of GPHS Bricks 8 8
No. of Couples 768 768
Hot Junction Temp 520 oC 600 oC
Cold Junction Temp ~170 oC ~170 oC
Mission Usage Multi-Mission Multi-Mission
Development Risk None Low – Moderate
Addressed Program MSL and Mars 2020 Europa, Discovery, New Frontiers
BOL – Beginning Of Life, fueling EDL – Entry, Descent, and Landing EODL – End Of Design Life, 17 yrs from BOL
* 28V, Thermal Inventory = 250 Wth; 4k thermal sink ** 32V, Thermal Inventory = 250 Wth, 4k thermal sink
*** Steady-state thermal sink, Mars hot case
JPL Led Technology Maturation (TechMat) DOE Led Flight Development
SKD Tech Maturation
Sys Risk Reduction
Module
Decision Gate 1
F4 F5
F6 F7
Start Flight Program Based on Acceptable Risk Level
Decision Gate 2
Launch
Design Qual Unit
Testing
Notional Schedule
Flight Development Gate
Notional Schedule Provided for Reference Only
eMMRTG Sys Eng
FY17 FY18 FY16 FY15 FY19 FY20 FY21 FY22 FY23 FY24 FY14
Launch
Low Risk Enhancements Are there potential customers in PSD’s Decadal Survey?
1 – 4 eMMRTGs
1 – 6 eMMRTGs
Data courtesy of RPS Program’s Mission Analysis Team
The MMRTG plus these highlighted
changes
What is being enhanced?
And many more that could benefit from the eMMRTG
were excluded from the Survey
results.
Technology Transfer & Maturation + MMRTG design mods = eMMRTG
PRESS RELEASE
Pre-Decisional Information -- For Planning and Discussion Purposes Only""