Evaporator help

[vab206]

so im new to the whole phase change deal and with all the information on this forum it seems like the only hard part will be getting all the parts and making my evaporator.

ive decided to make my own because ive only got about $100 usd in my system right now and all i need are schrader valves, cap tube, and a chassis. ive went through the evap gallery thread countless times and i think ive came up with a pretty decent design.

im not even going to tempt you all with my 3rd grade drawing skills so just work with me and get a mental picture here. for the base im planning on using a copper plate 3/16" thick (dimensions havent yet been decided probably 65mm x 65mm) and to add a good amount of surface area and some turbulence into my evap im wanting to braze this chipset heatsink (http://www.frozencpu.com/products/5521/vid-85/Enzotech_Forged_Copper_Northbridge_Heatsink_-_Artic_Silver_Cramique_Included_CNB-R1.html?tl=g40c16s229&id=3rQP3e8Z) to that plate directly centered then cap it all off with a 2" copper pipe cap.

i have a couple of questions though, #1 im assuming my suction line should come out of the top side of the evap (i dont know why but it just makes sense that the vapor form should come out the top) am i right to think this? #2 where should my cap tube run to, i was thinking slightly lower than the suction line but coming in at an angle to spray directly on the center of the heatsink within the cap (any help here would be appreciated, im pretty confused lol)

if anyone knows another better way to go about making an evap it would be greatly appreciated to point me in the direction of where i could find information on it.

thanks

[one_servant]

First, I applaud you for putting in the time to give this a try. It won’t be easy but nothing in life worth doing is easy! Also, welcome to the forums!

:welcome:

Now to your questions:

1: It is not only customary but practical for a CPU evaporator to have the suction line exiting the unit from top side. If you were building a GPU evap this might not be practical but with a CPU it is a practical necessity for a number of reasons. So, yes, make the suction line exit the top of your evap.

2: You want the cap tube to terminate as far as possible into the evaporator to create the largest distance possible between the suction intake and the capillary tube discharge opening. Theoretically speaking you can run your capillary tube INSIDE your suction line for a performance boost and have the tube exit the suction line several feet from the evaporator through a standard tee fitting. However, if you don’t want to go this route I would consider having the cap tube enter the evaporator near the suction line terminating deep within the evaporator.

I hope this is some help. If I wasn’t as clear as you’d like please let me know where you’re foggy. These other fella’s will have some good advice as well…stay tuned. :up:

[[XC] gomeler]

One issue that I've run into with capillary tubing inside of the suction line is the noise it generates. As the turbulent and fast gas flows through the suction line, it was causing the capillary tubing to vibrate inside the suction line and it drove me insane. Just something to keep in mind :up:

If you want to make an evap you might want to try your hand at an end-cap evaporator. I say this as if you have a single end cap and that pin heatsink, you'll blast refrigerant against the pins and then it'll be immediately sucked out of the evap. You won't get immensely high efficiency here and a lot of floodback. Now with an end-cap evap you'll force the refrigerant to stay within the evaporator for a longer period of time and therefore picking up more heat.

[vab206]

i think i know what your saying and im starting to think that an evap like that wont work very well, at least not being turned 90 degrees like in a normal case. id basically just have a big bucket with all the liquid boiling at the bottom side rather then on the core. time to re-think

[[XC] gomeler]

Endcap evap costs $20 ;) Great way to start, that's what I started with and it worked fine for a single-stage.

[Buckeye]

What if you installed that HS with the pins in it's own chamber. That is it has a copper plate brazed above it. Then a second chamber where the suction lines comes into.

So the cap line would go through the top chamber into the bottom chamber with all the pins. The seperating plate would have a hole drilled into it to have the gass below come up into the top chamber.

Don't know, it was just a thought.

[DetroitAC]

Yeah, Gomeler is spot on. A cap in cap evaporator would be better than what you're proposing. The refrigerant that flows into the evap from the captube is mostly vapor by volume with very little liquid, in fact roughly 99% vapor, so it behaves physically most like a vapor. The suction connection can be thought of like the hose of a shop-vac stuck into the evaporator, everything dumped into the evap is immediately sucked. With your idea a lot of the liquid might not even touch copper before it is sucked out. Good evaporators force the liquid/vapor mixture to flow with a lot of turbulence next to a lot of copper surface area before the flow is allowed to exit.

[vab206]

i see what your saying buckeye but i cant really get a mental picture, ill think about it and figure it out

[vab206]

im kindly stumped on a simple way to make an end cap evap... im probably thinking about it WAY too hard at this point lol. but i did find this (http://www.frozencpu.com/products/5129/ex-blc-316/Thermaltake_Aqua_Brazing_W1_Universal_CPU_Liquid_C ooling_Block_CL-W0087.html?tl=g30c85s139#blank) any way that would work as a evap? its brazed but idk how it would hold up to a pressure test. im thinking an endcap evap is what ill have to end up doing... time to google for another hour or so

[Postal Dude]

What Buckeye is saying is. Build the evap the way you were thinking. But make the pin array have its own chamber in the evap. THe pin array will have the inner chamber, which the cap line will run into, a small hole in this chamber so gas can be sucked out into the outer chamber where your suction line will be. This will restrict the immediate suction from out suction line and make it a bit more efficient

[vab206]

only bad thing im thinking about is that this is going to be in an upright system, so idk how well my whole idea would work out in the 1st place

[vab206]

ive decided on a chilly1 evap if i can get ahold of him, props to detroit thermo though, pretty sure usps set a land speed record getting my condenser to me!

[danlm]

Hey, vab206, runmc's under the ice(www.under-the-ice.com) has the chilly1 evap kits for $50. Not a bad price considering the thermaltake block you linked is $40-$45. I got a chilly1 from the site for my build. Ron is pretty fast too...I had my stuff two days after ordering. Check it out.

[teyber]

Hey, vab206, runmc's under the ice(www.under-the-ice.com) has the chilly1 evap kits for $50. Not a bad price considering the thermaltake block you linked is $40-$45. I got a chilly1 from the site for my build. Ron is pretty fast too...I had my stuff two days after ordering. Check it out.

wait! there is no chilly1evap KIT for $50! :( its the evap itself. The mounting and everything from my experience costs ME at least far more then the evap itself and a lot more time.

Thanks for posting- i hope you understood that before you purchased that as buying a separate mounting is the s*ck and very hard to find.
reed

[n00b 0f l337]

Though there are certain people who sell mounts, like Teyber ^^.

[danlm]

I was planning on making my own mount. If I get clever, it can be done. I was aware that it was just the evap. By kit, I meant just the unbrazed spiral and outer sleeve, not the housing, insulation, and mounting head. Sorry about that. Even if vab206 makes the copper cap evap, he is still going to have to find a way to house and mount the thing. For the money though, it's a good starting point, even if the housing and mounting are needed. Teyber, thanks for pointing that out, though :).

[vab206]

id like to get ahold of soddemFX's evap, i really like the way that stepping evap works and think it would perform quite well

[vab206]

actually if anyone knows how to get ahold of anyone who makes evaps and sells them either hit me on on a pm or post here, im kinda at a lack for info on this part

[one_servant]

You should talk to piotres (aka Peter). His work is top notch and he has plenty of refrences. Check this thread: http://www.xtremesystems.org/forums/showthread.php?t=170725&highlight=suction+lines

[vab206]

wow, his work looks top notch. and i really like how its a stepper :D