SNAP-DYN: Concepts for multikilowatt space power applications

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SNAP-DYN: Concepts for multikilowatt space power applications

Determan, W.R.

SNAP-DYN systems (SNAP reactors with dynamic power converters) are designed to use the demonstrated power conversion technologies of the organic Rankine cycle (ORC), the closed Brayton cycle (CBC), and the free-piston Stirling engine (FPSE) to achieve high overall system power conversion efficiencies of 16 to 20 %. The ORC, CBC, and FPSE technologies have been demonstrated in previous ground engineering tests at various power levels (1.3 to 25 kWe). These tests have shown that each has the inherent capability of more than 60.000 hr of operation. This capability is achieved in all three designs using a hermetically sealed system, working fluid lubricated bearings, and one or two moving parts. The major component technologies required for the space power system are reviewed to determine their technology status rating for early deployment of the system on near-term missions. The system concept is reviewed to determine its feasibility issues and characterize the system size, mass, and efficiency in the 10- to 50 kWe power range.