Simply awesome! When can we expect some numbers? :)
Simply awesome! When can we expect some numbers? :)
i am very anxious also
How is testing going??? :D
:toast:
that is a very nice build.
I can wait to see that mobo freeze over while you bench :clap:
chilly how come this not a sticky yet in the big projects section :stick:
is there progress or has something gone wrong?
Looks very nice sofar :toast:
That thing is a BEAST, can't wait to see it in action :banana:
I hope corvette aint blowed up or anything...
Spoke to him today and he is charging the unit!///
Sweeet. I can't wait to see. What sorta computer is going in this? Intel? Amd? I'd think intel to avoid cold bugs correct?
OMG this project is the mother of all projects, very nice work. hope to see results soon. good job soo far
I think the hardware is in his sig:Quote:
Originally Posted by n00b 0f l337
AMD FX-57, ATi EXPRESS 200 Motherboard, 1GB TCCD, 74GB Raptors in 0-Raid, RADEON X850 XT Platinum PCI Express, Logitech Z-5500 Speakers, Samsung 191T+
would be nice to play on wile running -100° temps :D
8th Update 9-3-05
We found 5 leaks in all. The system was stable at 300 psi for 3 days with no pressure drops.
Every time I found a leak I would take the pressure off the system braze the joint to stop the leak and when putting pressure back on the system I would watch to make sure the system on the suction and discharge would be about the same. By watching this I found out that one of my A7-A valves was in wrong. That would have sucked if I didn't catch that. Some of the brazing was done out side of the case and not in place, because it would have been to hard. That valve was done out side of the case so I can see how I missed it up. But it sucks.
Before insulating anything I wanted to trace all the lines down to make sure I have everything right. I have done it before but I just wanted to make on last check. I have used 50 feet of 1/4" tubing, and 20 feet of 3/8", there is some scrap as you can see but there is a lot tubing to trace.
The scrap box
http://www.public.iastate.edu/~nknau...ct%20(212).jpg
I made on last important discovery. The suction accumulator was on back words also. I had the in coming from the compressor and not the evap. That was a easy fix.
With everything checking out I can get started on the least fun part of this project insulating everything. I don't mind it but there are some areas that you can't get your hands into.
Insulating the suction accumulator
http://www.public.iastate.edu/~nknau...ct%20(213).jpg
http://www.public.iastate.edu/~nknau...ct%20(214).jpg
I put some glue on the tubing before putting the insulation in place
http://www.public.iastate.edu/~nknau...ct%20(215).jpg
http://www.public.iastate.edu/~nknau...ct%20(216).jpg
I would slight the insulation like this
http://www.public.iastate.edu/~nknau...ct%20(177).jpg
And put it around the suction lines like this. I called to find out what wall thickness I would needed if I have a -100C suction line temp. I was told 3/4", no one had any 3/8" ID 3/4" wall insulation so I made my own. I used two 3/8" wall.
http://www.public.iastate.edu/~nknau...ct%20(178).jpg
http://www.public.iastate.edu/~nknau...ct%20(179).jpg
I left the high stage suction line with only 3/8" since it will only have a temp of -50C
http://www.public.iastate.edu/~nknau...ct%20(180).jpg
Some of the other line were not as easy. This is the suction line coming back from the evap blocks for the CPU and GPU, the CPU line is insulated and the GPU is only half done.
http://www.public.iastate.edu/~nknau...ct%20(181).jpg
You can see I put some insulating tap on the cap lines to the expiation tanks.
http://www.public.iastate.edu/~nknau...ct%20(184).jpg
As you can see this is the line to the evap block for the CPU. You can see that the suction line has a 3/8" wall insulation on it. I put the 1/8" line that feeds the block on the out side of the 3/8" insulation along with the two blue wires. Those wires power the heater in the block, the green wire is a wire I put in place as a put wire. Once I get my controller with temp probes I will attach one of the temp probes to the evap block and pull the led up through the insulation with the green wire.
http://www.public.iastate.edu/~nknau...ct%20(182).jpg
http://www.public.iastate.edu/~nknau...ct%20(183).jpg
http://www.public.iastate.edu/~nknau...ct%20(188).jpg
http://www.public.iastate.edu/~nknau...ct%20(185).jpg
I pulled that insulation all the way up to the sub cooling HX.
http://www.public.iastate.edu/~nknau...ct%20(186).jpg
http://www.public.iastate.edu/~nknau...ct%20(189).jpg
This is the GPU side
http://www.public.iastate.edu/~nknau...ct%20(190).jpg
I taped the wires for the heater to insulation.
http://www.public.iastate.edu/~nknau...ct%20(191).jpg
http://www.public.iastate.edu/~nknau...ct%20(192).jpg
http://www.public.iastate.edu/~nknau...ct%20(194).jpg
http://www.public.iastate.edu/~nknau...ct%20(195).jpg
The two low stage suction lines done.
http://www.public.iastate.edu/~nknau...ct%20(196).jpg
The high stage suction line
http://www.public.iastate.edu/~nknau...ct%20(193).jpg
http://www.public.iastate.edu/~nknau...ct%20(197).jpg
See where my sensing bulbs are, there are two one on each suction line, CPU and GPU.
http://www.public.iastate.edu/~nknau...ct%20(198).jpg
http://www.public.iastate.edu/~nknau...ct%20(199).jpg
Both insulated
http://www.public.iastate.edu/~nknau...ct%20(200).jpg
http://www.public.iastate.edu/~nknau...ct%20(201).jpg
looking good, but its starting to get crammed up in there.
Excellent work :toast: I hope you can find some room for a nice exhaust fan at the back of the case where you have those slots cut out.
Regards
John.
9th Update 9-3-05
IT’s Alive!! IT’s Alive!!
IT’s Alive!! IT’s Alive!!
IT’s Alive!! IT’s Alive!!
You can see the box of the R402a
http://www.public.iastate.edu/~nknau...ct%20(204).jpg
This is a electronic sight glass
http://www.public.iastate.edu/~nknau...ct%20(202).jpg
http://www.public.iastate.edu/~nknau...ct%20(203).jpg
http://www.public.iastate.edu/~nknau...ct%20(207).jpg
http://www.public.iastate.edu/~nknau...ct%20(208).jpg
This is after 10 minutes of run time.
http://www.public.iastate.edu/~nknau...ct%20(211).jpg
After 10 minutes of run time the flat plate HX get down to -22ºC and stop, I let the system run for 1 hour and I've hit a wall. That's 28ºC higher than I need. Something isn't working as planned.
I've checked my sub cooling at the condenser, at 10 minutes I have 7ºF degrees , and at 1 hour I have 10ºF degrees .
Those Refrigeration Research sub cooling HX really work, thank you James. They have a 3/8" line in the center and the 1/4" line raped around them. After 1 hour of run time I have 45ºF degrees sub cooling.
I have been working with Darin Stoll at Mechanical Comfort, Reggie Wing aka Chilly1 at http://xtremesystems.org, and Gene Ziegler at Sporlan/Parker to come up with a solution to our problem.
I've taken the bulbs off the suction line, taken the cages out of the TXV's, I've taken the out orfes of them also, and it floods back to the compressor. I only let it do this for less than 5 seconds.
Everyone thinks something else is going on. To answer every ones questions I put a real sight glass in just before my TXV'x and a pressure tap to check pressure to see if I have a pressure drops and any flashing going on. Nothing
1st idea
That's it for this week, next week I'm calling Danfoss to check about the compressors, and Flatplate about the HX. I wanted to make sure there all sized properly.
2nd idea
I have an idea of seeing if my compressor is big enough for the HX. I think I might pinch off one of the valves and see if with just one HX what the compressor can do.
3rd idea
The TXV'x have the wrong heads
This isn't something I expected but it is fixable, it just takes time.
I know anything worth doing doesn't come easy.
All of you have a great weekend and I'm be back hard at it on Tuesday.
Are the txv bulbs placed after or before the subcoolers ?
Is the flow through the hx going upwards or downwards ?
Quote:
Originally Posted by berkut
12-14" after the flatpat HX and 10" before the subcoolers
What is the sucktion side pressure ?
Were the bulbs and TXV's insulated ?
You should fill the system with the bottle upside down
R402 (R22/R125/R290).
like berkut saids, blends must be filled in liquid form
Berkut is correct on the bulb placement. Critical to how the valve will respond.
Liquid charge is also correct, we see the bottle upright in the pic. If you filled the system with the bottle upright the gas in the bottle would now be considered fractionated?? Im not positive about 402a though.
I insulate the bulbs and vavle on my cascades.
Ok, you have two stages cooled by one. I built this config and tested. I would suggest per my observations (correct me in I am wrong) you should set the first stage around 20 psi @ -40c for the first stage maximum capacity to NOT dip when second stage is under full load. I would avoid going into a vacuum on the first stage.
http://www.public.iastate.edu/~nknau...ct%20(198).jpg
i found one.
the bulp must be placed on top of the tube, if there is oil in the tupe the valve will respond different.
<a href="http://img123.imageshack.us/my.php?image=bulb9ps.jpg" target="_blank"><img src="http://img123.imageshack.us/img123/2594/bulb9ps.th.jpg" border="0" alt="Free Image Hosting at www.ImageShack.us" /></a>