Search found 9 matches

by denisbudyak
Mon Jun 01, 2015 6:49 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Heat conductance losses in wire mesh stacks
Replies: 9
Views: 6153

Re: Heat conductance losses in wire mesh stacks

Ok, thanks, I'll maybe take a look at Xylan.
by denisbudyak
Sat May 30, 2015 5:35 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Heat conductance losses in wire mesh stacks
Replies: 9
Views: 6153

Re: Heat conductance losses in wire mesh stacks

Thank you, that's very interesting! Can you give some specific oil names and reference to data on their thermal stability? I dislike teflon as its thermal decomposition in the flame gives off very toxic gases (e.g. smoking is prohibited in a room where PTFE is stored). But if it is the only way to g...
by denisbudyak
Fri May 29, 2015 7:22 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Heat conductance losses in wire mesh stacks
Replies: 9
Views: 6153

Re: Heat conductance losses in wire mesh stacks

Hi! Thanks, I've seen the book. Definitely, foil has much greater heat conductivity losses than mesh stack and I checked this. IMO 0.02mm thick foil is required. Even if the regenerator foil is cut as in Kirk V2 Rider, local losses would occur between cuts. Totally, mesh stack seem to have smaller l...
by denisbudyak
Sat May 16, 2015 3:43 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Heat conductance losses in wire mesh stacks
Replies: 9
Views: 6153

Re: Heat conductance losses in wire mesh stacks

The most complex part of the problem is the heat conductivity in the contact of subsequent layers in the stack. Data on individual metals won't help here :( Also wire's surfaces are close enough to each other at some points, so gas heat conduction should be taken into account. I plan to use hydrogen...
by denisbudyak
Fri May 15, 2015 4:05 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Heat conductance losses in wire mesh stacks
Replies: 9
Views: 6153

Heat conductance losses in wire mesh stacks

Hi! Are there any estimates on that losses? I only found that http://www.ncbi.nlm.nih.gov/pubmed/11543366 but I don't know how to get full text. It is usually assumed that heat conductance losses are negligible, but I plan to do regenerator from phosphor bronse and not from SS. Bronse have several t...
by denisbudyak
Sun May 03, 2015 1:19 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Philips MP1002CA question
Replies: 5
Views: 4419

Re: Philips MP1002CA question

No :)
This is a picture from fig 2a

[album]154[/album]

If I didnt err,
9,5 at = 137psi
14 at = 202psi

So, pressure in the crankcase seem to be 137psi while working area has peak pressure no less than 202psi.
But this still does not answer my initial pressure.
by denisbudyak
Thu Apr 30, 2015 12:47 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Philips MP1002CA question
Replies: 5
Views: 4419

Re: Philips MP1002CA question

Hi! Thank you, but I have read these instructions already. Pressure gauge is located at the frame and it measures pressure in the frame, not in the crankcase or in the working space. Pipe connection scheme in the manual and on real engine do not match.
by denisbudyak
Fri Apr 24, 2015 11:32 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Philips MP1002CA question
Replies: 5
Views: 4419

Philips MP1002CA question

Hi! I'd like to know how presure inside working volume of MP1002CA was regulated. I consider two possibilities: 1. Working volume was fed with air from the crankcase through a check valve. In this case MINIMUM working pressure inside working volume is approximately equal to pressure inside crankcase...
by denisbudyak
Fri Apr 24, 2015 10:57 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Beta stirling engine simulator
Replies: 8
Views: 7159

Re: Beta stirling engine simulator

Hi! Schmidt theory is completely inadequate for real engine and it can not be useful for predicting its performance. Real program must use more accurate model of physical processes and calculate many kinds of losses which occur in real engine. Also good program must be tested carefully with real eng...