Search found 107 matches
- Fri Jul 05, 2019 9:49 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Torque question.
- Replies: 3
- Views: 14120
Re: Torque question.
I would say that this is a question of finding the 'sweet spot'. If you think about it, if you have a displacer stroke of zero, then the working fluid doesn't get moved from hot to cold to hot, so no energy can be obtained, but at the other extreme, if you have an incredibly long displacer (and stro...
- Tue Jun 25, 2019 6:19 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Stirling engine software
- Replies: 7
- Views: 16238
Re: Stirling engine software
Nlog looks to be a very complex bit of software - in a commercial environment you would have to pay a lot of money to get anyone to write anything that sophisticated, but having said that half an hour to initialise (as mentioned on that site) does seem inordinately slow.
- Thu Jun 20, 2019 7:09 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Proposed Air Cooling Tower
- Replies: 7
- Views: 20650
Re: Proposed Air Cooling Tower
How long would you expect this to run? You would get a very high rate of evaporation from this, which would aid the cooling, but might make it 'unexpectedly' run dry.
- Thu Mar 28, 2019 7:05 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: My stirling engine school project
- Replies: 28
- Views: 34195
Re: My stirling engine school project
That diagram still shows a large space behind your diaphram, which will be detrimental to the performance of the engine - make that as small as possible, so that the pipe essentially just goes straight onto the back of the diaphram.
- Fri Jan 04, 2019 7:19 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Burnt pancake displacer (carbon foam)
- Replies: 10
- Views: 14948
Re: Burnt pancake displacer (carbon foam)
I can see this kind of material being useful for displacers, particularly if you are using an inert gas, but surely not very useful for "open air" applications (such as round the hot cap, as suggested). Basically, what you have is open-cell graphite, so given enough heat, and any amount of...
- Fri Aug 31, 2018 2:41 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Alpha vs Beta
- Replies: 3
- Views: 10320
Re: Alpha vs Beta
So if the power-to-weight advantage is due to the 1:1 ratio, why isn't that used for the other configurations?
- Fri Aug 31, 2018 2:36 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Dual stirling generators electrically heated
- Replies: 16
- Views: 13600
Re: Dual stirling generators electrically heated
Running two engines off a single flame is not the same thing - the flame isn't dependant on the output of either engine. Unfortunately, every type of engine has an upper-limit to efficiency - this is often described as being a "Theoretical Limit" but that isn't really good grammar, as ther...
- Fri Jun 15, 2018 5:18 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Tesla's "Ambient Heat Engine" Experiment
- Replies: 175
- Views: 191700
Re: Tesla's "Ambient Heat Engine" Experiment
Is that a double displacer there? and 180 degrees out of phase with each other?
- Wed Jan 10, 2018 6:13 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Tesla's "Ambient Heat Engine" Experiment
- Replies: 175
- Views: 191700
Re: Tesla's "Ambient Heat Engine" Experiment
So, if no heat ever goes into the ice, what effect does it have on the system???? I think what Tesla was really getting at, (probably incorrectly) was that if the engine was 100% efficient (no chance) then the _output_ of the engine could be used to cool the ice/cold end. Which sounds to me rather l...
- Fri May 19, 2017 6:25 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Multi cylinder Stirling engine question.
- Replies: 4
- Views: 7930
Re: Multi cylinder Stirling engine question.
What info are you looking for? I'd have thought that the problems involved in building an eight cylinder engine are pretty much the same as for twelve cylinders, just with different angles. (And not necessarily then - sometimes multi-cylinder IC engine designs are merely two/three/four cylinder desi...
- Tue Apr 25, 2017 4:59 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Volum alfa model
- Replies: 26
- Views: 23769
Re: Volum alfa model
That picture shows the cylinder being vented at the right hand side - is that a mistake in the drawing, or how you've built it??
- Tue Apr 25, 2017 4:50 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Carnot and Stirling cycles
- Replies: 3
- Views: 6494
Re: Carnot and Stirling cycles
Even in an ideal Stirling Engine the piston has to move to draw power, which will result in a small change in volume.
- Tue Mar 14, 2017 8:58 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Stirling Generators
- Replies: 8
- Views: 11783
Re: Stirling Generators
Do you want enough power to run a computer, or just enough to be able to charge a device - there's a massive difference between the two figures.
- Fri Oct 14, 2016 4:10 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Tesla's Heat Engine
- Replies: 19
- Views: 19011
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.
I can't say I understand it well enough though, to do the maths to check whether it is theoretically possible or not.
- Fri Sep 04, 2015 7:09 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: varible phasing
- Replies: 27
- Views: 24462
Re: varible phasing
For the record, you can also get small ball bearings out of certain types of computer back-up tapes - I've grabbed a few from DLT tapes.
But am I reading you correctly - the 'proper' ball bearings have _more_ friction than your 'hand made' bearings?
But am I reading you correctly - the 'proper' ball bearings have _more_ friction than your 'hand made' bearings?