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by Tom Booth
Sat Jan 13, 2018 9:29 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's "Ambient Heat Engine" Experiment
Replies: 22
Views: 5621

Re: Tesla's "Ambient Heat Engine" Experiment

Wellington wrote:
Tom Booth wrote:According to an article by......



hello tom. can you provide a link to the material you reference. thanks.



http://www.unz.org/Pub/Century-1900jun-00175

The relevant sections start around page 200:

"A DEPARTURE PROM KNOWN METHODS—POS-SIBILITY OF A "SELF-ACTING" ENGINE..."
by Tom Booth
Fri Jan 12, 2018 4:38 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's "Ambient Heat Engine" Experiment
Replies: 22
Views: 5621

Re: Tesla's "Ambient Heat Engine" Experiment

I think the question hinges on what actually goes on in the inner workings of a heat engine. The predominant view had always been and to a great extent still is: for a heat engine to operate heat entering the engine must pass through the engine and out the other side, much like water passing through...
by Tom Booth
Mon Jan 08, 2018 7:20 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's "Ambient Heat Engine" Experiment
Replies: 22
Views: 5621

Re: Tesla's "Ambient Heat Engine" Experiment

I thought I might mention something I've been working on recently and am also curious to know if anyone else here has ever heard of it or done anything with it. https://en.m.wikipedia.org/wiki/Vuilleumier_cycle This "heat pump" is quite interesting. I think the patent is quite facinating a...
by Tom Booth
Sun Aug 20, 2017 10:00 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's "Ambient Heat Engine" Experiment
Replies: 22
Views: 5621

Re: Tesla's "Ambient Heat Engine" Experiment

Removing heat from the ice is really not a correct statement. If you study how a heat pump or refrigerating system actually works, it is more like the heat is removed during compression of the gas refrigerant. In those days refrigeration was accomplished by compressing air. The old "Cold Air Ma...
by Tom Booth
Sun Aug 20, 2017 9:43 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's "Ambient Heat Engine" Experiment
Replies: 22
Views: 5621

Re: Tesla's "Ambient Heat Engine" Experiment

Tom I have run my LTD motor on ice, the ambient temperature was 20*C, so there was a 20* (a little less) temperature differential. The but is the amount of energy required to make the ice. You certainly make a valid point. Energy is required to make ice in the first place of course. As quoted above...
by Tom Booth
Fri Aug 18, 2017 7:08 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's "Ambient Heat Engine" Experiment
Replies: 22
Views: 5621

Re: Tesla's "Ambient Heat Engine" Experiment

OK, so lets say you CAN get a Stirling engine to run on ice with NO or VERY LITTLE waste heat reaching the cold side of the engine. I'm theorizing that a Stirling can possibly be designed in a way where it might not contribute much if any heat to melting the ice,.. might even contribute to keeping t...
by Tom Booth
Fri Aug 18, 2017 2:07 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's "Ambient Heat Engine" Experiment
Replies: 22
Views: 5621

Re: Tesla's "Ambient Heat Engine" Experiment

Here is why I think this can possibly work. Take a lamina flow type Stirling. Lets say at point "a" of the cycle, air in the cylinder is expanding and pushing the piston out. At some point pressure inside the cylinder and atmospheric pressure outside the cylinder will equalize. But the pis...
by Tom Booth
Fri Aug 18, 2017 1:40 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's "Ambient Heat Engine" Experiment
Replies: 22
Views: 5621

Re: Tesla's "Ambient Heat Engine" Experiment

I think this is a significant update. I submitted the idea discussed here in this forum to a recent National Geographic Magazine contest. It got through the initial screening process. I've purchased a metal lathe, drill press and other tools and just recently got lucky in finding a place where I can...
by Tom Booth
Sun Oct 16, 2016 3:09 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's Heat Engine
Replies: 20
Views: 5858

Re: Tesla's Heat Engine

This pdf describes air-cycle refrigeration.

http://www.grimsby.ac.uk/documents/frpe ... search.pdf
by Tom Booth
Sun Oct 16, 2016 2:57 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's Heat Engine
Replies: 20
Views: 5858

Re: Tesla's Heat Engine

Sounds to me like you are talking about a variation on what is currently known as an "Air Source Heat Pump" I can't say I understand it well enough though, to do the maths to check whether it is theoretically possible or not. Well.. I think "air source" just refers to where the ...
by Tom Booth
Thu Oct 06, 2016 6:02 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Burnt pancake displacer (carbon foam)
Replies: 4
Views: 1152

Re: Burnt pancake displacer (carbon foam)

Some interesting info regarding the heat conductivity of various carbon materials. Very variable depending on how it is made. Interesting that pyrolytic carbon is or can be MORE heat conductive than copper by a factor of 5X. http://www.christinedemerchant.com/carbon_characteristics_heat_conductivity...
by Tom Booth
Thu Oct 06, 2016 1:58 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Burnt pancake displacer (carbon foam)
Replies: 4
Views: 1152

Re: Burnt pancake displacer (carbon foam)

One other thing. It's quite possible that starch is not the culprit as far as chalkiness goes. Possibly the opposite as some bread recipies call for added corn starch to make the dough more plastic and give the bread a better texture. The corn starch heated with some water seperately to make a goo w...
by Tom Booth
Thu Oct 06, 2016 10:19 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Burnt pancake displacer (carbon foam)
Replies: 4
Views: 1152

Re: Burnt pancake displacer (carbon foam)

The white bread hamberger bun was not very permeable. Not much air could get through. Some made out of a whole grain slice of bread ended up with very open pores that air could very easily flow through. It does also seem that various similar carbon fiber/mesh materials have been used as regenerators...
by Tom Booth
Tue Oct 04, 2016 2:38 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Burnt pancake displacer (carbon foam)
Replies: 4
Views: 1152

Burnt pancake displacer (carbon foam)

Recently I've been re-researching what sturdy lightweight materials might be used for an LTD displacer. The engine I got from amazon had some black foam rubber type displacer that shrunk and warped when I tried to run it on top of my wood stove for a few minutes just to see how fast it might go. The...
by Tom Booth
Sun Sep 18, 2016 6:19 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's Heat Engine
Replies: 20
Views: 5858

Re: Tesla's Heat Engine

Looks like a variation on the "Icy Ball" ammonia absorption refrigerator. https://youtu.be/jA6UBKi13BY As some here may be aware I've previously posted about the possibility of a heat engine running on ambient heat. Tesla worked on building such an engine........ . Take a look at Robert mu...

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