NEW Personal temperature record by piotres : -93.1*C ;-) and show on single-stage

[piotres]

Hi

That's SS for one nice guy from France ...first He had planned to buy Mach2/Vapo LS, later plan to order 1/3 HP SS from one builder in France and ...finally 3/4 HP (9000 BTU) SS with CPEV from me .

That's first time I've mounted CPEV near evaporator (CPEV outlet is connected by 10 cm, 5 mm OD pipe with evap). In that way CPEV works much better, reaction for tunning is much faster and pulldown time too .

No case, only metal baseplate, my customer said that He'll make case from plexi by himself .
Freezepack controller (by GSMaster) and suction pressure gauge, are extras which customer really wanted .

Unit beat mine "old" record with single (-88.1*C) - it has made -93.1*C .

Specs :

Compressor: Sanyo C-1RV137H11AA
evap: steeper by piotres
XV: CPEV Fach "PZ" mounted near evaporator head
condenser: 2 row, alu-cu, cooled by 4*120 mm NBM 12V fans
Refrigerant : R507/R410a blend
Baseplate : 49 x 35 cm zincked plate baseplate
others: REFCO low side gauge, FreezePack controller (by GSMaster)



Suction line together with polish CPEV .



When freezeControler arrived ..











First run ...and fighting for the COLDEST temperatures on evap (completelly closed CPEV) . RESULT : -93.1*C (that's now not WR , becasue Symphy has beat me with -94.4*C but with single-stage 2.5 HP build by me ) .



On 223W dummyload.



On 202W dummyload.



On 115W dummyload. As you can see -54*C in freezer's limit :-/ . Eg. real -54 = -54 on LCD, but eg. -60 real = still -54 on LCD, -65 real = -54 LCD etc. :-( .















Some tests on Conroe E6700es ..4+ Ghz/1.6V = lower that -60*C on evap in full stress .



and finally well packed ;-) .


Regards
Peter

[Pete]

OMG how cold!!! Only by a roatry though are we going too see these temps!

How does a cepv work then? Whats it's purpos

[piotres]

Originally Posted by Pete

OMG how cold!!! Only by a roatry though are we going too see these temps!

How does a cepv work then? Whats it's purpos

"In that way CPEV works much better, reaction for tunning is much faster and pulldown time too ." - as I've written in first post ;-).

and Guys please see that's WITHOUT any SLHX pure, simple single with CPEV

[epion2985]

well with the cpev most of the liquid boils before the evap, but it doesn't look like its really effecting anything negatively. Though maybe it does and is just compensated by r410 and a huge compressor and condenser.

Wonder how a cpev set up like this would work out on an small nf9fx r404a single stage.

[potkit]

holy , you are the man
i see, no slhx rulz xD
so, how expensive is a cpev i want to try it in my next SS with a rotatory if possible

[hatemi]

Way to go

[{.bLanK} GoD]

Very nice piotres.
Please tell me that isn't silicon around the thread of the LP gauge...

[piotres]

Originally Posted by {.bLanK} GoD

Very nice piotres.
Please tell me that isn't silicon around the thread of the LP gauge...

It's LeakLock -special compund made by Refco to seal threads in refrigeration units .

[{.bLanK} GoD]

Originally Posted by piotres

It's LeakLock -special compund made by Refco to seal threads in refrigeration units .

Just as well
It just looked a lot like silicon.
And anyway, leak lock is over rated. If the flare doesn't seal properly, leak lock isn't gonna seal it.
Leak lock is more for thread locking purposes to stop the nut undoing itself over time with expansion and contraction.

[expansionvalve]

On the upside, interesting build
On the downside, it would be interesting to see how accurate thermometer is, recent calibration cert would elimimnate the pinch of salt feeling I have.

[piotres]

Originally Posted by {.bLanK} GoD

Just as well
It just looked a lot like silicon.
And anyway, leak lock is over rated. If the flare doesn't seal properly, leak lock isn't gonna seal it.
Leak lock is more for thread locking purposes to stop the nut undoing itself over time with expansion and contraction.

I know that . I always use leaklock for threads, just a habit .

@expansionvalve : In icy-water it shows 0.0- +0.2*C so I think it's OK .

[sacha35]

Very Very nice temps there mate for a S/S unit, does the CPEV effect the compressors life in any way
As it has a reduction in the amount of return cooled gas/liquid?

Any way well done again on a fantastic build.

Sacha

[Moc]

CPEVs are great! Piotres work is also great .

[johann]

very nice unit.

I dont like the cpev on that position but if it works its ok. So its for benching only, you can never mount inside a closed case.

What is the REAL idle temp not the "Record temp" with CPEV closed?

Did you use 3Dmark and SuperPi to fully stress CPU? Why dont you use Orthos or something similar because 3Dmark and SuperPi will not stress the cpu 100%

[BNDMOD]

Good job man!!! great temperatures

[Unknown_road]

you still try to get lowest temp possible by closing a valve???

what's the fun in that?

[Duniek]

if you build next rotary ss I want see temperatures on fluke 51

[LukeXE]

Originally Posted by Unknown_road

you still try to get lowest temp possible by closing a valve???

what's the fun in that?

Next thread with "record" title.

[piotres]

Originally Posted by Duniek

if you build next rotary ss I want see temperatures on fluke 51

OMG You think it's fake ?

I tell You sth : I had got a Fluke 52 I thermo for a short time (already gone to new cascade owner) ...eg. on mine cascade it shows -103*C when same time that voltcraft K101 shows -104*C (You can see pictures in mine topic about cascade from signature).

OK, so I've done -92*C with Single-stage, now You fell better ?

Originally Posted by Unknown_road

you still try to get lowest temp possible by closing a valve???

what's the fun in that?

Sorry, but it's fun for me to reach temps near -100*C with refrigerant which has boiling point around -50*c in 0 bars . But I understand, not everybody must "like" that .

Originally Posted by johann

very nice unit.

I dont like the cpev on that position but if it works its ok. So its for benching only, you can never mount inside a closed case.

What is the REAL idle temp not the "Record temp" with CPEV closed?

Did you use 3Dmark and SuperPi to fully stress CPU? Why dont you use Orthos or something similar because 3Dmark and SuperPi will not stress the cpu 100%

I haven't tested idle, I only make a short test on CPU .

OK, I understand, so CPU was in stress, but not fully stressed .



Regards
Peter

[wdrzal]

You could only set those temps without load,and using a oversized compressor running in a deep vacuum.

no load temps mean NOTHING.

by doing this when it comes time to cool @ working temps @ working load, the compressors you are using are much to large, they will run up the power bill . plus the noise from a larger compressor and all those fans.

So don't go bragging about something meaningless ,it will come back to bite you. refrigeration is not like a race car,the bigger the motor the better, It the opposite the smallest motor running efficiently is the way to go for daily use

Running a compressor in a vacuum if not designed for that purpose will substantially shorten its life . You want the gas to do the cooling @ reasonable pressures.

[pazza316]

Nice unit!!

Great Temps for sure! and clean build!

[Duniek]

-92*C isn't the same as -93*C heheh
you bulit nice unit but if you have pressure below 0 bar on suction, compressor have a problem with oil return, you should use oil separator,

*in theory

[boshuter]

Originally Posted by wdrzal

You could only set those temps without load,and using a oversized compressor running in a deep vacuum.

no load temps mean NOTHING.

by doing this when it comes time to cool @ working temps @ working load, the compressors you are using are much to large, they will run up the power bill . plus the noise from a larger compressor and all those fans.

So don't go bragging about something meaningless ,it will come back to bite you. refrigeration is not like a race car,the bigger the motor the better, It the opposite the smallest motor running efficiently is the way to go for daily use

Running a compressor in a vacuum if not designed for that purpose will substantially shorten its life . You want the gas to do the cooling @ reasonable pressures.

Walt... I highly respect your opinion on refrigeration...... BUT, that reply was completely out of line imo... that's like saying using ln2 to oc is completely meaningless, it's not efficient and not the way to go for daily use either.... but so what? It may not be the way you would do it, that doesn't make it meaningless, I just think if you aren't impressed by the way he did it, just ignore the thread, don't put him down for doing things his way. The hell with the power bill and the noise, it's extreme isn't it? Hope you don't take this wrong, just MHO

BTW; I'm impressed piotres

[wdrzal]

Boshunter I wanted to impress on you guys what he's doing is meaning less and to be blunt, running in deep vacuums are very hard on compressors,oil breaks down,electrical winding insulation breaks down, all from being overheated,..............bet he set more records there also discharge temp,head temp. all can ruin a compressor if over heated

I also pm'd piotres detailed reasons why this should not be done immediatly after my first public post above.

[runmc]

This is a race we're talking about A drag race with nitro burning engines that have to be rebuilt after every race. You know I appreciate every bit of advice you have to offer. You have helped me to no end, and I'm getting ready to approach you about giving me private phase change lessons. Let's take all this in context.

Most guys here know as soon as he straps a load on that evaporator his temps will take a major nose dive and he'll have to start pumping in the refrigerants by the ounces. These numbers (low temps) are all for show - No Go!!

BTW - piotres - beautiful job. How do you like the controllers? I just got two in the mail that I will be listing very soon.