Stirlingengineforum.com

Vamoose I'm very sorry if I appear to be a purveyor of 'subtle opportunistic antagonisms', it was not, and is not my intention to be antagonistic and am dismayed that I appear that way. I am very fortunate to have gained some knowledge from very experienced people on the subject of Hot Air engines a...

It doesn't bother me, I am simply being polite to the originator of this thread.

GeoffV

Dave This is the problem, most academic analysis has referred to publications such as Kays and London for heat exchanger performance. Unfortunately, and as has now been realised/accepted, all the heat transfer data is for steady fluid flow and consequently appears to be very wide of the mark when ap...

Derwood Apologies for the diversion. Vamoose The Thermomechanical Generator is simply a very short stroke Beta Stirling cycle engine, short stroke because the displacer is held by a flat spring which limits its travel and very similar in operation to the Free Piston Beta engines developed by SunPowe...

Dave I have emailed this link to Allan for his suggestions as he has travelled this path, probably more comprehensively than any other academic to date. It is likely he will decline to offer advice as it is essentially impossible to measure many of the inputs you need and therefore it will be based ...

could it not be just as plausible that the engine ceased working because the speed of sound in helium is 3 x that of air? Having discussed this matter at length with a very close friend, Allan Organ, and with reference to the article from the University of Gent, I do not believe there is any signif...

Gentlemen I must reiterate my dislike of the term 'Lamina Flow', these engines function due to a Thermal Lag, which is also present in the Stirling cycle but detrimental to the performance, and the gas flow within the engine is certainly turbulent, NOT lamina. The Thermal Lag can be demonstrated, as...

Fullofhotair You are quite correct when you suggest that the heater exhaust should be as near ambient temperature as possible. Stacking engines on top of each other is not the most elegant way to achieve this as the coolest running engine would see so little heat that the efficiency would be very ve...

Zhivko The chart I published shows heat transfer from a solid to air, not a solid to air to a solid! For heat transfer to take place there must be a temperature difference, so by definition the fins will be cooler than the temperature of the air by conduction alone. There will be some radiant heatin...

Zhivko

How do you intend to join the fins to the outer casing of the heater? if they are not welded to the case, there will be very little heat transfer.

GeoffV

RenewableEnergy Regarding your proposed design, I must ask why you favour the three gear Rhombic as depicted in the video. Most of the noise generated in a Rhombic is from the syncronizing gears and adding a third gear will simply increase the noise and the friction, I see no point. I also fail to u...

Jim Thank you for posting the links to these development projects. Unfortunately nothing has been seen or heard of the Stirling Cycle engines since being published in, 2008 for the Red Ferret report and 2009 for the Kamen press release. It begs the question " are these projects still active&quo...

Derwood For the purpose of measurement and comparison, the capacity of your TLE is, bore area x stroke (swept volume), Hot air engine derivitives are normally categorised this way with a few exceptions such as, the vee twin alpha. Because the working volume in a vee twin alpha cannot be equal to the...

Derwood I believe I now understand why your engine is so dependant on choke size, FRICTION, if I may expand my thoughts. From my test results, the choke produces a more 'peaky' curve and slightly less power than the tubular cooler head and changing the choke size in small increments demonstrates tha...

Derwood

Apologies for the distraction.

Vamoose

Thanks for the link, it works well.

GeoffV