PM Research Solar Engine #3

That combustion is so very "external", it looks incredibly inefficient. Even so, very interesting.
How exactly do these work? Is it a kind of Stirling engine?
 
graham-xrf said:
That combustion is so very "external", it looks incredibly inefficient. Even so, very interesting.
How exactly do these work? Is it a kind of Stirling engine?
Click to expand...

I honestly don't really grasp how they work. I think there different from a Stirling engine.
 
OK - here is a start. They are also called "vacuum engines".
The term "engine" is hardly applicable.

 
graham-xrf said:
OK - here is a start. They are also called "vacuum engines".
The term "engine" is hardly applicable.

Click to expand...

I have some Chinese ones and they are exercises in frustration.

The PMR one does have some power to it, I can easily run some accessories off it.
 
They are heat displacement...

Notice the large fins.

The flapper valve is usually very thin, feeler gage often.

Timing is simple valve is open as piston goes out then shuts at end of stroke with cylinder full of hot air.

The fins dissipate the heat cooling the air.

Cooling air is smaller volume creating the vacuum to pull piston up.

Simple design in interesting to watch.

Sent from my SM-G781V using Tapatalk
 
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