Stirlingengineforum.com

If you have a textbook anything like this, please share. To kick this can further down the road... Just my all text book says hot end connected beta same pv as normal beta. Cause you can draw it anyway - power pistom from any side of displacer will see same pressure on expansion. Especialy if one i...

My small addition - it is beta hot end connected. Not gamma ?

Not sure what RPM has to do with power necessarily. You could have low RPM and higher torque for example. Below 3000 rpm we do not see significant dynamical load on pistons and other moving parts. Mostly static, due to different forces. Above 6000 rpm - dynamic forces will break conrods etc if engi...

Do not be afraid of my workshop :) back to wilson engine. What i was able to show - extra volume do cost extra loses. Can we negate them other ways or ?
Can we add simple valve in single acting hot gamma? Or only twi hot gamma ?

Kind of none. We are at best of 3000rpm with some helium gas. Or 1500 with air/n2

VincentG wrote: ↑Mon Jun 24, 2024 10:16 am Beautiful shop.

Thank you.

Have you read the Andy Ross book "Making Stirling Engines" ? (link to free download was recently posted) Do you have a novel gamma ??? My first stirling which do run and produced some power. But hard to assemlby and harder to modify - too many places with silicone sealant. https://stirlin...

Matt - alfa is always limited to high temperatures/ideal mechanism. Not 600/300, but 900/300 region. Reason - compression piston consumes 70% of expansion piston made power. And all this is diluted by piston side pressures etc. Where gamma or beta have only power extracted and returend to same pisto...

Btw - for 69mm cylinder one can buy 68mm diametr cup holder from stainless stell. It fits with good gap for hot cap. Sad, its only limited for 30mm stroke or a little more. Cylinders are 47.5mm long, skirts is 5mm height. Screenshot_2024-06-19-19-16-25-350_com.alibaba.aliexpresshd-edit.jpg Screensho...

Modeled numbers are below. Cold pp have wrong gas in wrong place, and need twice amount of hx sizes to have similar result compared to more compact hot pp.

Good discussion. I have attached some of mine more complex diagrams - calculating equivalent alpha striling engines. Which for our 300 / 600 K asks for 130-140 degree of phase and 0.7-0.8 volume ratios cold / hot. Found in Allan books, and more than one practical examples. Cold pp - 153 degree of ph...

I am curious about the current "go to" piston ring for a large working Gamma. The small brass desktop demonstrators seem to have no seal, or use a rubber O-ring. The 1880's Rider-Alpha used leather seals that were lightly oiled, and the design simply accepted a certain amount of air leaka...

Indeed, the same gas mass produces more power when hot PP vs cold PP, but if we have equal size PP, we can equalize output (cold vs hot PP) via increasing the gas mass and DP volume relative PP volume proportional to the thermal ratio. Therefore, in this 300-600k example, if the cold PP volume equa...

I suspect a well-made Gamma (or possibly a dual-Gamma) would perform as good as a well-developed Wilcox, and a part of me is interested in the Wilcox simply because they are not well-known. By that I mean that...if the two types performed the same, I would still be more interested in the Wilcox. I'...

I'd definitely stay with cold PP since this solves most of the secondary nasties (sealing, lube, etc) and allows repurposing various parts. Even if hot PP has far greater output per given size (~2x within typical DIY values) and reduces regen loss by same as if magic, the wide range of design/build...