CryoStar Sli and CPU evaporators by Gosmeyer

[gosmeyer]

They must take ages on the milling machine!

Not as long as you think!

[sparkY1000]

Fantastic looking evap Gosmeyer and Runmc!

Do you have anyway to test it compared to a traditional stepped evaporator or a chilly1?
I would love to see a direct comparison using the same refrigerant, compressor, condensor, etc...

[n00b 0f l337]

And if you have a charging scale ron, the same amount of refrigerant. Then calculate everything out and see if ones more efficienct then the other.

[Barnsley-Bill]

Realy good results Ron and boy them evaps look great a credit to gosmeyer btw is your milling Machine cnc ?.

[runmc]

Hi Ron - Thanks

I don't understand the KWh figure

But 2.3A, is this at 115v? If so, 265W input power would give you a COP of greater than 1 - this is very, very good for a CPU single stage!

Tom

Killawatt hour = KHW This is the rate at which we are charged for our electrical service.
115v is correct.

Are you going to mass produce them once you've found the best design?

Yes

I don't have the time, patients, or desire to test and create the exact same environment for each evaporator. I think this evaporator has well proved itself. The newer design about will hopefully work as well or better.

That would be a good endeavor for you to try n00b

[Roger_D25]

SoddemFX,
Just curios, when you calculated the COPr I assume you used 265w for Win, but what did you use for Qin? Granted I'm no expert but it's very interesting to see an application for all the stuff I learned for my degree! Am I correct in thinking this is what you used for calculate the COPr,

COPr=Qin/Win (I suppose I could calculate Qin using, Qin=(COPr)(Win) but not sure exactly what the COPr was)?

If I'm completly lost could you please let me know what you used? By the way runmc/gosmeyer great job on that evap, it will be interesting to see which varient (suction/cap tube placment) works best. Plus there have been alot of different idea's and thoughts about whats the best way to setup the evap so it will be interesting to see how those thoughts and idea's compare to the real world results!

[wdrzal]

Hi Ron - Thanks

I don't understand the KWh figure

But 2.3A, is this at 115v? If so, 265W input power would give you a COP of greater than 1 - this is very, very good for a CPU single stage!

Tom

I believe those kill-a watts measure wattage and give you the average over time being monitered. so if a fridge ran 30 out of a hour it would give average over 1 hour. thats was the one I saw,they may be able to be set to give direct readings

[Brettbeck]

Not as long as you think!

Do you have an approx time? Just curious , because I may have access to lots of milling machines soon .

Is it a CNC lathe?

[Pansuu]

This time i have to say WOW, realy cool looking design

[gosmeyer]

btw is your milling Machine cnc ?.

Do you have an approx time? Just curious , because I may have access to lots of milling machines soon .

Thanks guys
Barnsley-Bill, Yes

Brettbeck, It takes a few hours from raw stock to finished machined part, not counting brazing.
It would take ages if it was on a manual mill with a rotary table, back in the day that’s the way we had to do it.

[wdrzal]

A cnc lathe won't make that , its probably made on a 4 axis cnc mill. but could be made on a 3 axis cnc mill

[n00b 0f l337]

I'm waiting on NF11fx tests

[DetroitAC]

1.57 KWH - 2.3AMPS

Hi Ron - Thanks
I don't understand the KWh figure

I don't understand it either. Did the system run for 5.93 hours

264.5W x 5.93hours = 1.57 kWh

[runmc]

This is what it says about the kill a watt meter. Evidently I had set a timer some how.

Connect your appliances into the Kill A Watt, and assess how efficient they are. A large LCD display counts consumption by the Kilowatt-hour just like utility companies. You can figure out your electrical expenses by the hour, day, week, month, even an entire year. Monitor the quality of your power by displaying Voltage, Line Frequency, and Power Factor.

Measures:


Cumulative kWh over time (using built in timer)
Watts (active power)
VA (apparent power)
Volts
Current (amps)
Frequency (hertz)
Power Factor

[SoddemFX]

SoddemFX,
Just curios, when you calculated the COPr I assume you used 265w for Win, but what did you use for Qin? Granted I'm no expert but it's very interesting to see an application for all the stuff I learned for my degree! Am I correct in thinking this is what you used for calculate the COPr,

COPr=Qin/Win (I suppose I could calculate Qin using, Qin=(COPr)(Win) but not sure exactly what the COPr was)?

If I'm completly lost could you please let me know what you used? By the way runmc/gosmeyer great job on that evap, it will be interesting to see which varient (suction/cap tube placment) works best. Plus there have been alot of different idea's and thoughts about whats the best way to setup the evap so it will be interesting to see how those thoughts and idea's compare to the real world results!

Yes your right it wasn't scientific at all, just the evaporator capacity over power consumption. I know it ignores suction line heat ingress etc but hey...

Tom

[Roger_D25]

Thanks Tom for the explanation on that, much apprecaited! Just so you know I wasn't being critical of your calculation I truly wanted to know I'm starting to realize that most of the problems I did in college (Thermo and Mechanical Design) were really just "idealized" cases which don't alwasy do a great job at modeling "real world" problems. That is why this is so interesting to learn about, so thanks again Tom!

[runmc]

I brazed the center-cap tube feed this morning. It is so easy

As you can see I used 1/4" feed tube. I'm going to soft solder the feed tube and suction together when I get the cap tube installed.

Enclosures and insulation will be milled soon. Gosmeyer is working on it as soon as he can get time.

Suggestions welcome.

[[XC] gomeler]

That looks damn good.. I hope these make a production run as I know there's a market for them :P:

[runmc]

That looks damn good.. I hope these make a production run as I know there's a market for them :P:

They will - within the next couple of weeks for sure.

[Dualist]

I like the new internal design, looks like the refigerant is gonna have to work inside there now rather than 'flow'. Much more effective

[runmc]

gosmeyer "Tomorrow" evap from Under the Ice has turned out to be a champ in our eyes. Thanks go out to all forum members who contributed design ideas and performance suggestions. I would call this design "Original" even though we copied the round circle and made it out of copper.

We tested the evaporator on an Danfoss NF5.5CLX because we thoughts good results would be more impressive from a smaller compressor rather than bullying our way on a fat hog of a compressor.

The cooler will hold 280+ watt loads as long as you want to sit there and watch. Please don't walk away from a load tester that is powered unless you have some sort of heat overload protection. I have melted 2 enclosures and ruined 2 heater cartridges this way.

Enclosures are being perfected ATM for proper cutting tool. Gosmeyer wants the finest finish possible on all enclosures, even his own personal which he is making out of clear acrylic.

We are running about 15 degrees superheat and 6 degrees sub cooling. 15psi low - 250psi high under 280 watt load
Temps are -30C evap and -22 load block temp

Pictures -

[n00b 0f l337]

Seems to be ONE HELL OF AN EVAP!
:Congrats:

[LittleDevil]

Really nice results

regards

[sacha35]

Great work there runmc, what compressor and refrigerant are you using, 15PSI on the low side with only 250PSI high side at 280 watts.

Well done again on some very nice work, all you time and effort has paid of, Good job well done guys.

[n00b 0f l337]

One last question to go with what refrigerant (and I'm guessing its r507a or r402a with the first more likely), what cap tube length?