Free Piston Stirling Cycle Free piston Stirling cycle engine (FPSE) dynamic conversion was modeled because it provides a thermodynamic advantage over the Brayton cycle. For equivalent performance it operates at a lower cycle temperature ratio which translates to reduced radiator size. It is mechanically simple with few moving parts, which are not in contact during operation. Although on a specific weight basis the Stirling engine does not scale favourably with increased power level, its specific weight is lower than the Brayton
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