Aviator168 wrote:You have 3 displacers here?
No, just one displacer, but it has holes in it. Like this:
The regenerator consists of tubes running from top to bottom.
My reasoning for having the heat on top is that heat rises.You might also want to switch cold and hot ends.
As explained, there's just the one displacer. I imagine the regenerator having some sort of ceramic (non heat conducting) housing with steel wool in the tubes and also steel wool sandwhiched on top and bottom pressed against the hot and cold ends of the displacer chamber.Suggestion. If you get rid of the two side displacers and encase the regenerator section with insulation, it would be a good beta heat exchanger.
I'm not entirely sure what you mean in that last sentence.Keep in mind, Stirling engine cylinder surface does not scale well with volume. Increase of surface area is not proportional to increase in volume.