Cap tube sizing rule

[Ssilencer]

I'm using 3.2m of 0.031 with good results with r502, but I think 0.028 are more widely used, 200cm of 0.028 is ok for 200watts loads

[Unknown_road]

Well build a system put 200 W with that length of cap tubing for 0.031.... see if it can even hold load..... The 1.6 is widely acknowledged rules yes... but that is moving from one idealistic to another idealistic condition. I've seen different result in real life testing.

first off all I was just explaining gary's rule. Second of all my experience is that 3 meter of 0.031 can hold 200watt

[jinu117]

first off all I was just explaining gary's rule. Second of all my experience is that 3 meter of 0.031 can hold 200watt

eternal question comes up again... which no one has answered from my experience... WHAT is 200W in CPU load? :P Voltage, cpu and overclock will do nicely lol... Where does your experience with 200Watt comes from?
I am not trying to be an ass here but I think we have way too many wide varying idea of what 200W is when the simple thing is... 200W is 200W... -_-;

[Unknown_road]

eternal question comes up again... which no one has answered from my experience... WHAT is 200W in CPU load? :P Voltage, cpu and overclock will do nicely lol... Where does your experience with 200Watt comes from?
I am not trying to be an ass here but I think we have way too many wide varying idea of what 200W is when the simple thing is... 200W is 200W... -_-;

load test block.............

[the_new_guy]

how long captube should i use for 50 watt load?

i am use it on my G4 eMac, stack wattage is 22 watts.

i will be using R134a, or maybe r404a with a 1/6hp compressor.

according to rule i should use about 25' of 0.031

i was think to start with 24' of 0.031 and shorting if needed.

[jinu117]

how long captube should i use for 50 watt load?

i am use it on my G4 eMac, stack wattage is 22 watts.

i will be using R134a, or maybe r404a with a 1/6hp compressor.

according to rule i should use about 25' of 0.031

i was think to start with 24' of 0.031 and shorting if needed.

Just stick to conventional cap tube. You will still have nice freezy -40c or below.

[the_new_guy]

so is 14' of 0.031 good?

[Unknown_road]

go with 0.026"

[the_new_guy]

why do u say so?

i heard 0.031 is better as it has less chances of blockage

[jinu117]

My strongest units with 1/4 hp NF9FX is 9ft 2inches to 9ft 6inches of .031. We are talking loaded evap temp with dual core 1.7v @ -42c below. Anything shorter will be hard to tune for good temp with current crop of cpu without liquid slugging... anything longer... you will see better temp with lower load but not great temp on high voltage power hungry cpus.

[LittleDevil]

I have 0.7mm captube and R402a gas... How long is best for 180 - 200W load?

tnx

[Ssilencer]

Guestimate 2/2.20mts, at least that's what I'll try next time.

[C-BuZz]

Well build a system put 200 W with that length of cap tubing for 0.031.... see if it can even hold load.....

I just tried it using this rule & it wasent pretty using a 1h rotary w/R290 & evap temps dropped off the face of the earth..

EXACTLY 3.2M of .031" Cap my evap temps drop to -25c & that's with just a mild overclock on my Fx. I'd guess around 160w load. Couldnt hold the load regardless of the charge.

Idle temps where pretty good at around -45c. My small Vapochill SE could hold a better load.

Im guessing 2.6M .031" should be just about right?

C-BuZz

[johann]

I have been experimenting with 0.031 on a few systems.

As Jinnu above I find that longer than 3 meters becomes too restrictive mostly especially when you charge for a high heatload. You struggle to hold load temp.

Like Jinu117 for me 2.7m - 2.8m have worked well in general from smaller (1/5hp) systems too a 3/4hp monster its a good length too start with

[kayl]

eternal question comes up again... which no one has answered from my experience... WHAT is 200W in CPU load? :P Voltage, cpu and overclock will do nicely lol... Where does your experience with 200Watt comes from?
I am not trying to be an ass here but I think we have way too many wide varying idea of what 200W is when the simple thing is... 200W is 200W... -_-;

If ya make a good heatload tester there is not way in the world a 200W load tested = 200w CPU
even 150w to 180W with a load tester is massive.

some of the mistakes ppl do when making resistor load is that the resistors used are no where near flat, and dont make very good contact with the metal plates. Also the clamping pressure between the resistors/ cold plate and CPu block need to be good, other wise ya cant remove the heat.

My strongest units with 1/4 hp NF9FX is 9ft 2inches to 9ft 6inches of .031. We are talking loaded evap temp with dual core 1.7v @ -42c below. Anything shorter will be hard to tune for good temp with current crop of cpu without liquid slugging... anything longer... you will see better temp with lower load but not great temp on high voltage power hungry cpus.

perfectly said jinu117.i use around ~3m for singles and around 2.5m for cascades.
if you insulate that suction line real real good ya can use that tad bit longer capillary line.
ppl are forgetting some of the most important things when build a system. A system running at its coldest is not a system thats gonna last for eva.
Too short a capillary line, and yes you will handle nice load for benches.
But when a room starts to heatup and you start benching for a few hours with heavy programs you just cant keep the liquid refrigerant from swamping the compressor and before ya know it ya got 2k supaheat, then comes 0k and the evap temps slowly warm up.
I wonder how many ppl actually have 10-15K supaheat at heavy load??

Too long a capillary line and you can get nicer idle temps, but once the compressor gets up to temp, you really risk overheating that compressor.

[Fhqwhgads6680]

But when a room starts to heatup and you start benching for a few hours with heavy programs you just cant keep the liquid refrigerant from swamping the compressor and before ya know it ya got 2k supaheat, then comes 0k and the evap temps slowly warm up.

I think I have been noticing this, on my system running R22 I notice that after about 5 min of pulling down to temp its at its coldest (Idle around -26c cpu die temp read in windows, load around -5c cpu die temp) and after about 3hrs or so its idling at about -22c and about 0c load. This this is due to cap tube sizing or is my condenser not removing enough heat to be condesing at its best due to High discharge temps of R22?

[kayl]

[QUOTE=Fhqwhgads6680][QUOTE=kayl]
But when a room starts to heatup and you start benching for a few hours with heavy programs you just cant keep the liquid refrigerant from swamping the compressor and before ya know it ya got 2k supaheat, then comes 0k and the evap temps slowly warm up.

I think I have been noticing this, on my system running R22 I notice that after about 5 min of pulling down to temp its at its coldest (Idle around -26c cpu die temp read in windows, load around -5c cpu die temp) and after about 3hrs or so its idling at about -22c and about 0c load. This this is due to cap tube sizing or is my condenser not removing enough heat to be condesing at its best due to High discharge temps of R22?

its hard to say exactly.
from what i hacve noticed, when the compressor is cold and suction warm on firt turn on, this is when you will get your best temps.
As the compressor heats up and the suction line slowly getc cold all the way back to the compressor ya losse a few c's.
I personlly found r22 very hard to use hey, those 240+PSIG high side pressures make it hard.
i only tried r22 a few times then back to r290. It was reclaimed r22 so may have been contaminated though. fair amount of r22 with r290 gave some nice results though better than straight r290.

to know if your condenser is doing its job measure the temperature of the liquid line just after leaves condenser and before the drier, should be about 6k (subcooling) difference between the pressure chart value and what you measure

(to work out subcooling and supaheat values read here/
http://www.xtremesystems.org/forums/...eat+subcooling

[Fhqwhgads6680]

Thanks that helps a TON!

[quintus]

rrrr got some problems with my first ss.
i got 240cm long cap the usual 0,7mm and 134 as freon. This is for 120 wat am i right? using the same size but charging with 404 i got 180watt
is my calculation right? teoretical at least!
greetings,
q

[jinu117]

Keep in mind, as compressor gets warmer, high side goes up a little while low side climbs up slightly. This keeps compressor from overheating by giving it enough cooling to compressor. (well superheat stays even... and yes, I do tune my units with safe margin of superheat usually 12-15k) However, in my systems, unless compressor gets warm enough, it doesn't have it's best temp for actual load :P

[[XC] 2long4u]

Im planning on a 200w heat load with r290 and .028 captube. This would put it at 6 feet. Does that sound right? I could start at 10 and go down from there while testing.

[Rockhammer]

That sounds about right.

[Big SturL]

6 feet? Sounds a bit short. Of course, depends on your other components. Which are..?

[[XC] 2long4u]

It seems short to me also. The longer the tube the lower the low side right? I'm making my condenser tomorrow. I have .28 captube and will post the pump specs later. Condenser is gonna have 2 rows that pass 13 times.and is 7 1/2" by 7". Not to bad for an eye shot.

[Unknown_road]

6 feet is short in comparison to what? a 0.031" cap with r507?

I don't think 8 feet will be able to hold the load anymore. but maybe start with 8 feet and work down from there.