Small Stirling dynamic isotope power system for robotic space missions
The design of a multihundred-watt Dynamic Isotope Power System (DIPS), based on the US Department of Energy (DOE) General Purpose Heat Source (GPHS) and small (multihundred-watt) free-piston Stirling engine (FPSE), is being pursued as a potential lower cost alternative to radioisotope thermoelectric generators (RTG's). The design is targeted at the power needs of future unmanned deep space and planetary surface exploration missions ranging from scientific probes to Space Exploration Initiative precursor missions. Power level for these missions is less than a kilowatt. The incentive for any dynamic system is that it can save fuel and reduce costs and radiological hazard. Unlike DIPS based on turbomachinery conversion (e.g. Brayton), this small Stirling DIPS can be advantageously scaled to multihundred-watt unit size while preserving size and mass competitiveness with RTG's. Stirling conversion extends the competitive range for dynamic systems down to a few hundred watts--a power level not previously considered for dynamic systems. The challenge for Stirling conversion will be to demonstrate reliability and life similar to RTG experience. Since the competitive potential of FPSE as an isotope converter was first identified, work has focused on feasibility of directly integrating GPHS with the Stirling heater head. Thermal modeling of various radiatively coupled heat source/heater head geometries has been performed using data furnished by the developers of FPSE and GPHS. The analysis indicates that, for the 1050 K heater head configurations considered, GPHS fuel clad temperatures remain within acceptable operating limits. Based on these results, preliminary characterizations of multihundred-watt units have been established.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
- OSTI ID:
- 6235211
- Report Number(s):
- N-93-28686; NASA-TM--105785; E--7215; NAS--1.15:105785; CONF-9208114--; CNN: RTOP 596-13-11
- Country of Publication:
- United States
- Language:
- English
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Small stirling dynamic isotope power systems for multihundred-watt robotic missions
Related Subjects
070300* -- Isotopic Power Supplies
DESIGN
ENERGY SYSTEMS
ENGINES
HAZARDS
HEALTH HAZARDS
HEAT ENGINES
HEAT SOURCES
NESDPS Office of Nuclear Energy Space and Defense Power Systems
POWER RANGE
POWER RANGE 100-1000 W
POWER SYSTEMS
RADIATION HAZARDS
RADIOISOTOPE HEAT SOURCES
STIRLING CYCLE
STIRLING ENGINES
THERMODYNAMIC CYCLES
WATT POWER RANGE