Search found 156 matches

by Stroller
Thu May 09, 2024 3:44 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's Ambient Heat Engine revisted
Replies: 232
Views: 45584

Re: Tesla's Ambient Heat Engine revisted

OK, no problem. I'll leave you with a last attempt to be helpful. If your power piston is graphite, just be aware that it has an emissivity around 4x that of aluminium. That means it radiates energy much more effectively than the top plate. That will cause it to have a higher temperature, given prox...
by Stroller
Thu May 09, 2024 2:17 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's Ambient Heat Engine revisted
Replies: 232
Views: 45584

Re: Tesla's Ambient Heat Engine revisted

as can also be seen in the videos I did check the temperature from time to time. But of course, you're prone to pass judgement, criticise and comment on videos of experiments you haven't bothered to watch but supposedly "skimmed through". I'm not passing judgement, and my criticisms are o...
by Stroller
Wed May 08, 2024 11:38 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's Ambient Heat Engine revisted
Replies: 232
Views: 45584

Re: Tesla's Ambient Heat Engine revisted

Tom Booth wrote: Wed May 08, 2024 7:34 pm Not to forget the boiling water it's been sitting over for three hours.
Did you measure the temperature of that three hour old "boiling" water?
by Stroller
Tue May 07, 2024 8:35 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Heating a LTD Stirling engine efficiently
Replies: 5
Views: 2356

Re: Heating a LTD Stirling engine efficiently

Thanks Vincent. Overspeeding power piston momentum is a problem I'd like to be having to deal with. At the moment, getting more heat in faster is the issue. My increased surface area idea isn't complicated, and can be machined onto the existing engine plates with a single point cutter on a CNC machi...
by Stroller
Tue May 07, 2024 8:29 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Wilcox Caloric, 1860, open-cycle, regenerator
Replies: 25
Views: 7393

Re: Wilcox Caloric, 1860, open-cycle, regenerator

I wonder how many of these ever got made.

If an oven door had been fitted to the cavity on the left, the operator would have been able to keep his lunch warm while he waited for the beast to get up to working temperature...
by Stroller
Mon May 06, 2024 10:44 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling essex - beta or gamma ?
Replies: 35
Views: 17662

Re: Stirling essex - beta or gamma ?

Does any-one have any ideas ? Does essex stirling engine is the answer to question about typical 1/1.5 ratio of power piston to displacer found in normal gamma engines with cold expansion space ? If you're asking about the stroke lengths, it's around 1:0.6 displacer/power-piston ratio according to ...
by Stroller
Mon May 06, 2024 11:01 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's Ambient Heat Engine revisted
Replies: 232
Views: 45584

Re: Tesla's Ambient Heat Engine revisted

This is after three hours running on boiling hot water. That entire engine top has an aluminum cylinder fused together with the aluminum top plate. A stock engine. The power cylinder and cold plate are stock, as they came in the kit, unmodified, not insulated, no acrylic, no aerogel. Only the sides...
by Stroller
Sun May 05, 2024 6:37 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's Ambient Heat Engine revisted
Replies: 232
Views: 45584

Re: Tesla's Ambient Heat Engine revisted

BTW original project focused on 100W from 100C differential (which req'd minor mod) Maybe they were looking at the viability of generation from the waste heat of watercooled ICE engines. Hence the antifreeze at 130C. I guess it doesn't matter so much how small the output is if the input energy is '...
by Stroller
Sun May 05, 2024 2:59 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's Ambient Heat Engine revisted
Replies: 232
Views: 45584

Re: Tesla's Ambient Heat Engine revisted

Molar mass of Ethylene Glycol is 62.068 g/mol Specific gravity is 1.13 in 0.33litres there will be 376.66/62.068 = 6.068 mol Specific heat capacity of Ethylene Glycol in liquid form at 125C is 149.5 J/(mol·K) 149.5 * 6.068 mol * 10K temperature drop = 9072J Is this right or have I fouled up? 9072 Wa...
by Stroller
Sun May 05, 2024 1:33 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's Ambient Heat Engine revisted
Replies: 232
Views: 45584

Re: Tesla's Ambient Heat Engine revisted

Thanks Matt. There's some data there we can calculate with. I've summarised it in this image. Info from here: http://www.bekkoame.ne.jp/~khirata/academic/kiriki/yama1/index.html Unfortunately, they don't tell us which of the three configurable stroke lengths the power piston had been set at for the ...
by Stroller
Sat May 04, 2024 11:13 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's Ambient Heat Engine revisted
Replies: 232
Views: 45584

Re: Tesla's Ambient Heat Engine revisted

If only I could afford the shipping I'd take your "junk" off your hands for you. 12kW of solar energy costs no more than time and effort, plus some space blankets and ingenuity, Over at my petite ruine in France I have many 20' lengths of 2" bamboo to lash up a parabolic framework wi...
by Stroller
Sat May 04, 2024 11:04 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's Ambient Heat Engine revisted
Replies: 232
Views: 45584

Re: Tesla's Ambient Heat Engine revisted

I at least skimmed through all the videos you linked. They are interesting. I missed that the scalloped foam piece rose and fell (how far?) and thought the air was being moved by the spiral cut white material "thermal valve"attached to the displacer rod. What was the start and end time, th...
by Stroller
Sat May 04, 2024 2:07 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's Ambient Heat Engine revisted
Replies: 232
Views: 45584

Re: Tesla's Ambient Heat Engine revisted

If only I could afford the shipping I'd take your junk off your hands for you. 12kW of solar energy costs no more than time and effort, plus some space blankets and ingenuity, Over at my petite ruine in France I have many 20' lengths of 2" bamboo to lash up a parabolic framework with. And an ac...
by Stroller
Sat May 04, 2024 2:00 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's Ambient Heat Engine revisted
Replies: 232
Views: 45584

Re: Tesla's Ambient Heat Engine revisted

That project's a 'problem' I'd love to have.
by Stroller
Sat May 04, 2024 1:55 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's Ambient Heat Engine revisted
Replies: 232
Views: 45584

Re: Tesla's Ambient Heat Engine revisted

I'm a lazy engineer. I don't stuggle to make sense of tiny temperature differences with comparatively big error ranges for unusable power outputs when I can play with bigger projects. If I were you, I'd be spending this part of the year making parabolic mirrors and stocking up on free tube and rebar...