use the attach option dimas;)
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use the attach option dimas;)
some more of my evap pics :)
http://helderfonseca.planetaclix.pt/evaps/rev4both.jpg
http://helderfonseca.planetaclix.pt/evaps/rev441mm.jpg
http://helderfonseca.planetaclix.pt/...aprev435mm.jpg
http://helderfonseca.planetaclix.pt/...rev435mm01.jpg
http://helderfonseca.planetaclix.pt/...vapsanxu04.jpg
http://helderfonseca.planetaclix.pt/...apperico02.jpg
http://helderfonseca.planetaclix.pt/...completo01.jpg
like always all is done by me, from lathe to brazing jejejej
I'm currently building my evap, not finished yet but before I finishing it, I want to know what you think about the design.
sadly I havn't access to a lathe anymore 'cause my old friend have sold it.
But I still have my own miller at home.
I attach a image of the design, hope you understand.
http://goto.glocalnet.net/timedlund/Untitled-1.jpg
what do you think about the design? should it work proper?
chanals is 5mm wide, ports between inner/outer ring is 8mm (8*5 between the two lower "stages").
5mm holes in the top stage, and 3/8" out for suctionline, capilary tube goes inside the suction and spray liquid r404 in the bototm.
It probably will work quite decent. Basically bit more advance than Baker's evap from looks. However, bit more distance in bottom plate will help most likely as I see very short amount of time liquid travels in bottom of evap.
the only thing all those layers do is make it harder to build and more expensive.
Surface area should be in the solid piece that has contact with the cpu.
My layman's opinion is that adding layers is adding barriers, or imperfect conduction, between the cpu and the upper part of the evap. More layers also equals more brazing = more chance for leak. More layers = more expensive.
The evaps job is to move as much heat from the cpu into the refrigerant as possible - I think one peice units do that most effectively as there are no added thermal barriers (imperfect,limited or very minimal contact between layers can occur). When I'm thinking about design - I like to think about "when the refrigerant gets to this point - how does this point conduct back to the heat source - what path must the heat take?" Does that make sense? While balancing volume, mass, and surface area is important - if you have layers then you have to add thermal barriers in there as an added consideration.
Chilly's evaps, and other steppers in sleeves, have to conduct from the plate and back to the massive center column and down (thats backward really - but you get the idea) no stops - just pure copper all the way. In layer designs - imperfect contact between them might mean the only way to conduct is out to the outer edge and down - and then through layers of brazing - just doesn't seem as good as the solid design.
If the brazing were perfect and the conductivity between layers acting as though they were one piece of copper - then I think its a great design.
But - I'm not an expert on evaps - I don't even play one on TV.
This is my first design - should have the prototype in about a week.
<a href="http://img209.imageshack.us/my.php?image=evap5asa2.jpg" target="_blank"><img src="http://img209.imageshack.us/img209/7720/evap5asa2.th.jpg" border="0" alt="Image Uploaded by ImageShack Toolbar"/></a>
It's a bit expensive because its a little more complicated than a stepper.
Another I'm working on is based on Eleven's evap.
<a href="http://img212.imageshack.us/my.php?image=11basedlu7.jpg" target="_blank"><img src="http://img212.imageshack.us/img212/6470/11basedlu7.th.jpg" border="0" alt="Image Uploaded by ImageShack Toolbar"/></a>
Any reason it isn't an effective design?
edited for typos
well, the price of making it doesn't matter 'cause I produce it myself.
but the lost of friends lathe make it difficult to make a solid evap.
I have pretty good miller so the evap parts will fit perfect on less then a 0,01mm differens.
[edit]
by the way I have to reconstruct the evap 'cause I'm going to use cpev, the capilary tube isn't going thought the suctionline then.
quasi, i like your design. mind if i give it a try in the near future while im trying other designs? i dont think i will make one exactly like pictured, i would modify it some to simplify machining (all my work is done manually)
Evaporator should have good heat conduction channels to large surface area which should be NOT shining smooth. Ive read from some cold machinery book that rough surface area can be multiple times effective in case of boiling than same size surface which is shining (i think that cross-like Dimas? evaporator might be somewhat decent if it had roughened surface because otherwise it conducts heat well).
Most evaporators are just trying to be different and are more like visual shows than actually have some desingn in these aspects (multiple layer evaporators for example).
Some kind simple of pin-type block with directed refrigant flow channels might do the job nicely.
Just piece of my mind.. Im hoping DetroitAc will remove some myths about the subject some day with his testing system. Seems very promising this far.
well, this is an ideia to mix maze and steep.
my and sl4ck evaps thred: http://www.xtremesystems.org/forums/...d.php?t=116847
some pics:
http://img132.imageshack.us/img132/9750/3d1cp0.jpg
http://img360.imageshack.us/img360/807/1go8.jpg
http://img98.imageshack.us/img98/5476/2rf9.jpg
http://img98.imageshack.us/img98/2386/1ww0.jpg
http://img165.imageshack.us/img165/3106/1tq7.jpg
http://img356.imageshack.us/img356/4157/5lh1.jpg
http://img174.imageshack.us/img174/4654/3hm1.jpg
DetroitAC has done some great work building that steady state calorimeter. That will stop all the guessing and conjecture and assign a actual value. I have a feeling there going to be some surprises :) . I also have a feeling there going to be a explosion in new designs,the great thing his testing will show if a design is moving the performance in the right or wrong direction. :woot: :toast:
Ps: detroitac ,I seen your evap kits did you think of offering one a t a slightly lower price and leave the drilling of holes or slots and the brazing up to the customer. If anyone is untested,I sure someone will want his own unique flow pattern.
In any case your work WILL move evap design forward. :clap: :clap: :clap:
|RickY| your evap looks great ;)
thanks
By the way: here is one evaporator which i made pretty long time ago for compressor setup which i never finished really :wth:
http://koti.mbnet.fi/ilkkahy/sekalai...evaporator.JPG
http://koti.mbnet.fi/ilkkahy/sekalaiset/evap%201.jpg
http://koti.mbnet.fi/ilkkahy/sekalaiset/evap%202.jpg
Seems that ive lost the best pictures where its finished but youll get the idea.
Thanks for the encouraging words guys :toast:
I was thinking pins also ikkahy, this is one concept evap I'll test that is 72 rods perpendicular to the flow direction, four passes, with an increasing cross sectional area. As you can see I didn't plan for the size of my suction tube very well and lost one rod. I don't like the thin blocker plates on this, I'll never do that again, and this one took a really long time to build...but you know, it's just a one-off concept.Quote:
Originally Posted by ilkkahy
http://img220.imageshack.us/img220/5...evap043xh8.jpg
http://img181.imageshack.us/img181/7...evap044jf6.jpg
http://img181.imageshack.us/img181/6...evap042ya7.jpg
The bottom part is missing in those pics or have i understood wrongly? If that big piece is meant to be bottom im not sure if the refrigant flows that well in those holes.
Very nice machine work anyways. I wish i had mill at my usage.
The small piece (with the thin plates sticking out) is the base. It has short holes drilled in to hold the rods in place. The big piece has holes that go through, and the rods were inserted with the two pieces assembled. The base was made extra thick so I can mill it down in between tests to (try to) find the optimum base thickness.
Hmm.. that was unexpected. You want to use pins for creating turbulence? I dont see the benefit from their surface area unless they are well "thermally connected" to cpu.
DetroitAc: would you happen to be intrested in realizating evaporator if i desinged something special with care? I pretty much know what kind of constructions are possible, too hard or just impossible to make with basic machinery.
They are inserted into and then brazed to the base, so yes directly thermal conduction to the base, and added turbulence and conduction area. PM me with your idea ilkkahy
http://www.extremecooling.net/index/...0_dscn4247.jpg
http://www.extremecooling.net/index/...0_dscn4250.jpg
http://www.extremecooling.net/index/...0_dscn4251.jpg
http://www.extremecooling.net/index/...0_dscn4253.jpg
http://www.extremecooling.net/index/...ilder_015_.jpg
http://www.extremecooling.net/index/...ilder_014_.jpg
http://www.extremecooling.net/index/...ilder_018_.jpg
the small one is 10mm high :)
made for NB or GPU
easy to braze
costs less than 10€
Nice evap, but are you purging while brazing? Do you have mounting for it?
thanks
lol, thats exactly what my german people asked me. :p:
No, i didn't purge them but the next I will! :)
For the mounting, I need plastic like you use for your mounting but I dont know where I get it local... :(
Do you sell mountings for GPU evaps? My Evap has 28mm diameter.
Every evap has different mounting, i can make it if you send me evap, but on your i don't see any groove for oring or something like that...
thanks
Here is one basic principle of channel type evaporator that i think might be pretty damn effective. The idea is pretty simple but if the channels were threaded it would have plenty of surface area and very good heat conducting properties. The edges would require accurate milling but i think it might be worth trying. Suction and refrigant channels would come to evaporator from the edge plates that arent seen in the picture.. i just got that 3d program today so i didnt bother to draw them yet :D
http://koti.mbnet.fi/ilkkahy/sekalaiset/evaporator.JPG
Here is my evap cleaned :D
http://ld-phasechange.com/images/evaps/2.jpg
thanks
sexy LD. That thing must have taken for ever to polish like that.