Search found 8 matches

by LES_Thermodynamics
Thu Oct 12, 2023 2:35 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Rarefication
Replies: 33
Views: 26356

Re: Rarefication

There is an interested type of Stirling engine called the horn engine, which has a large horn at the top with a narrow long body. It was made to test the idea of gasses expanding at the bottom due to heat and condensing at the top due to more space and cooler temperatures. The only one that I’ve see...
by LES_Thermodynamics
Wed Oct 11, 2023 6:22 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Rarefication
Replies: 33
Views: 26356

Re: Rarefication

I have this plan someday to fill a tri-clamp pipe to the top with salt, with one end welded closed. Then heat that up- which would heat up the bottom of the engine once attached. Molten salt, which is then combined with water to create steam - then pumped through a turbine is how most people receive...
by LES_Thermodynamics
Wed Oct 11, 2023 5:02 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Rarefication
Replies: 33
Views: 26356

Re: Rarefication

Hi all, I’ve been meaning to reply but have been caught up in projects. To Tom’s point - yes it would be ideal to have a container that is not conductive IF you wanted power only when heated. When you use something like 304ss it holds heat like a phase change material, which will allow the engine to...
by LES_Thermodynamics
Fri Oct 06, 2023 7:23 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Rarefication
Replies: 33
Views: 26356

Re: Rarefication

Les, The trouble with that description of Adiabatic processes, is twofold: 1. In the real world, and especially in hot-air engines, there is ALWAYS some heat transfer in/out of the walls of the engine. 2. Timing. At low speed, or in step-by-step analysis, all of the working-fluid changes temp/press...
by LES_Thermodynamics
Wed Oct 04, 2023 7:42 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Rarefication
Replies: 33
Views: 26356

Re: Rarefication

Yes, the expansion and compression of a gas inherently come with temperature changes, even in the absence of direct heat transfer with external heat sinks. This phenomenon is a fundamental principle of thermodynamics and can be explained using the ideal gas laws and the concepts of adiabatic expansi...
by LES_Thermodynamics
Tue Oct 03, 2023 4:10 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Rarefication
Replies: 33
Views: 26356

Re: Rarefication

Also adding this video to show the thermoacoustic effect without a diaphragm. (Watch your volume)

https://youtube.com/shorts/vCZ-Nm5N9aU? ... pbEkkPxypI
by LES_Thermodynamics
Tue Oct 03, 2023 1:12 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Rarefication
Replies: 33
Views: 26356

Re: Rarefication

Sure! I will only talk about my specific engine, since that is what I have the most experience with. Thermoacoustic Effect: In my vertically oriented design, when the base is heated, air ascends through an internal stack. Adjacent to the upper portion of this stack, there's an ice sleeve, facilitati...
by LES_Thermodynamics
Mon Oct 02, 2023 12:57 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Rarefication
Replies: 33
Views: 26356

Re: Rarefication

Hi all, I was redirected here from reference traffic to my website. I am the creator of the Stirling engine in this thread.

AMA!