[QUOTE=LaurV;582416]Nope, he means [URL="https://en.wikipedia.org/wiki/Stirling_engine#Configurations"]stirling engine[/URL]. :razz:
:busy:[/QUOTE]Nope, that GIF is most likely a simplified schematic of an air cooled radial piston [U]internal [/U]combustion engine. A nearby university's Mechanical Engineering Department had a cut-open actual aircraft radial engine on display in the 1970s with that cylinder count and layout. IIRC it was designed for military aircraft used in WWII, with outstanding specific fuel consumption and other specifications for its time, rotatable by hand on the truncated prop blades, and with deburring/edge breaks but no finger guards at the cuts. [URL="https://en.wikipedia.org/wiki/Pratt_%26_Whitney_Wasp_series"]https://en.wikipedia.org/wiki/Pratt_%26_Whitney_Wasp_series[/URL]
Stirling engines are [U]external [/U]combustion or other heat source and consequently have several times the heat exchange requirement per unit of output power:[URL="https://en.wikipedia.org/wiki/Stirling_engine"] https://en.wikipedia.org/wiki/Stirling_engine[/URL]
Internal combustion engines, for fuel input Q, produce roughly Q/3 output work, Q/3 cooling system load, Q/3 heat content of the exhaust flow, while external combustion engines like the Stirling engine of equal efficiency need Q heat exchange in, 2Q/3 heat exchange out; 5Q/3 total heat exchange, versus Q/3 for the internal combustion engine; 5-fold higher. Plus Stirling engines typically operate at lower hot side temperature, so lower absolute temperature ratio, lower theoretical maximum efficiency, increasing the heat exchange/work output ratio above 5:1.
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