Search found 11 matches

by Deferr
Tue Apr 21, 2009 7:06 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Hi everybody, I am new to the forum :)
Replies: 3
Views: 2838

Re: Hi everybody, I am new to the forum :)

Great to have you on the forum. If you are able post pictures or drawings of you rotary Stirling engine. We would love to see it.
by Deferr
Mon Apr 20, 2009 6:26 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Large scale Geothermal developement
Replies: 5
Views: 4182

Re: Large scale Geothermal developement

A thermal engine will never reach carnot efficiency. Carnot efficiency suppose infinite stable thermodynamics transformations. This is important. I should have mentioned it in my post. The Carnot cycle is the ideal efficiency of any thermodynamic cycle operating between two temperature resovoirs. T...
by Deferr
Mon Apr 13, 2009 7:52 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: My first can engine
Replies: 1
Views: 2850

Re: My first can engine

Nice engine. I have not had such luck with can type engines.
by Deferr
Mon Apr 13, 2009 7:51 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Displacer Chamber PSI ?
Replies: 3
Views: 3180

Re: Displacer Chamber PSI ?

It is very common and widely accepted to use an isothermal analysis in first order analyzes. I agree with CanadaPhysics. The easiest, most conservative way is to assume that the cylinder is at some static pressure before heating, calculate the mass of the air, and calculate volume of the air. Then a...
by Deferr
Mon Apr 13, 2009 7:44 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: I am new to the Forum, here are some of my engines.
Replies: 3
Views: 5858

Re: I am new to the Forum, here are some of my engines.

Very impressive engines. The videos are a very nice touch. Did the original Stirling fan require restoration? Do you have anymore information on who made it, how much it originally cost, etc?
by Deferr
Mon Apr 13, 2009 7:40 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Usable Power for Stirling Engines?
Replies: 2
Views: 2894

Re: Usable Power for Stirling Engines?

There is a larger problem with running a Stirling engine in a freezer. In order to keep the freezer cold the freezer must use electrical energy. Much of this energy is wasted in the form of friction and heat dissipated out of the back of the freezer. The user, however, is paying for this lost heat i...
by Deferr
Mon Apr 13, 2009 7:29 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Large scale Geothermal developement
Replies: 5
Views: 4182

Re: Large scale Geothermal developement

This sort of engine would definitely need to be low temperature difference. This means a large displacer diameter to stroke ratio is required for efficient operation. This also means a shorter power piston stroke would be necessary. It should be noted that the efficiency of a heat engine cannot exce...
by Deferr
Mon Apr 13, 2009 11:42 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Building a small alternator
Replies: 4
Views: 4008

Re: Building a small alternator

I am very impressed with the ingenuity of the hinged angle displacer. Next engine it would be great if we could all see in-progress pictures. It's always nice to see how others go about making things. Great work.
by Deferr
Mon Apr 13, 2009 11:37 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling engine design feasibility
Replies: 3
Views: 4212

Re: Stirling engine design feasibility

I agree with the previous post that this engine design is not feasible as drawn; however, with a few modifications it may be possible to run a free piston ringbom stirling engine similarly. I have attached a depiction of such an engine. I hope this may help. http://www.moteurstirling.com/images/free...
by Deferr
Mon Apr 13, 2009 11:33 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: LTD builders info
Replies: 1
Views: 2093

Re: LTD builders info

This experimental finding matches with LTD stirling engine analytical work as well as published experimental findings. Many experimental LTD engines have variable power piston stroke in order to re-adjust the swept volume of the power piston based on the running temperature difference.