Is a Stirling Cycle Engine Still Valid with an Open Cold Reservoir?

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A Stirling engine can function with an open cold reservoir, as it would still operate under the principles of the Stirling cycle. Allowing air exchange with the ambient environment may not negatively impact the engine's performance, provided the cold reservoir maintains a standard temperature and pressure. This configuration could be classified as an open Stirling cycle engine rather than a closed system. The discussion highlights the potential for innovative designs in Stirling engines that leverage ambient conditions. Overall, the viability of such an engine remains valid within the Stirling cycle framework.
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Let's say that I have a stirling motor designed in such a way that the cold reservoir is always at standard temperature and pressure (or at least very close to it).

So, if I were to put a hole in the cold reservoir there should be no effect on the engine running, but it might exchange air with the outside world (due to diffusion or turbulence or something) -- in fact, the cold reservoir could just be an opening to the ambient air.

Would the resulting engine still qualify as a stirling cycle engine?
 
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I believe is would qualify as a Stirling cycle - and perhaps it would be considered open as opposed to closed.
 
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