Another small update tonight. I brazed on a second service valve to this peice of copper tubing so i could install the high pressure switch.
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Another small update tonight. I brazed on a second service valve to this peice of copper tubing so i could install the high pressure switch.
I suppose its time for another update.
My torch finally went dry on friday so today i finally got around to getting a full tank. Total cost for the same size tank u saw in 1 of my pics was $55.76 Cad.
The old tank lasted me 1.5 years and was already 3/4 empty when i got it.
Few new pics to post tonight.
I added a sight glass and a filter drier to the 2nd stage tonight unfortunitly the sight glass is leaking around the glass part.:( I tried several times to seal it but no luck so ill have to pick up another sight glass on thursday for the system.
I also added a vibration reduction loop to the suction like on the compressor.
Was at the shop today got my new sight glass :D.
BTW anyone still following this thread?? The last 7 or 8 posts are all mine :(.
Yes, I follow, but as a noob, I don't know anything to say :)Quote:
Originally Posted by _HL4E_HalfLife_
Ask questions, if ur not sure what something is or the purpose of some part or something ask on here im sure me or several other guys will answer u. :cool: :DQuote:
Originally Posted by Comp-Freak
UPDATE!!
I know its been a while since there was an update here but i was kinda waiting for my UEi DT150 thermometer to come in and today i got it :woot: :banana:. That thermometer i had been using was accurate even at -45c.
I've insulated most of the suction line now just not what i got the probe stuck (pic4).I also brazed on the new sight glass on the 2nd stage. I ran the first stage and reached a low of -66.5f/-54c but i think i can do better im gonna tweak the charge and i need to add more insulation to the insulation thats already on the suction line because its still forming water droplets on the outside of it :eek:.
Im not so sure i want to or could connect this cascade system to my pc anymore mainly because thats alot of things that could go wrong and i can't afford it right now but i might just put a small A/C evap on it and put it in a cooler and make a super freezer and test how things like motors,old computer components and things like that work under extreme cold i also have a liquid that doesn't turn to a solid untill it get to -111.1c who knows maybe ill use this cascade as a liquid chiller and just use the waterblock im using now :D.
NO way this can happing if you have a high pressure cutout installed on your high side, which you should have, and BEFORE the filter drier.Quote:
Originally Posted by Tonic
Quote:
Originally Posted by gkiing
Yea i agree with u gk theres no way the pressure would build high enough in a closed system to cause a joint or a peice of tubing to balloon and burst.
BTW does anyone know what a peice of copper tubing will acualy burst at in psi? i would guess at least 800psi.
Quote:
Originally Posted by _HL4E_HalfLife_
dont quote me on it, but a figure of 2000psi come to memory for some reason.
HL4E_HalfLife have you decided what refrigerant you will end up getting for the second stage??
have you got a tec or resistor pack, they make a decent dummy load. :D
Quote:
Originally Posted by kayl
i'll be using co2 from a paintball can and no i don't have a tec. What is a resistor pack?
depending on the wall thickness it ranges from about 720psi on the low end up to about 1600psi for 3/8" tubing
check mcmaster carr if you know the wall thickness you use
that depends largely on 2 factors. the pipe diameter, the bigger the pipe the weaker it is. the wall thickness, logicly thicker wall is stronger.Quote:
Originally Posted by _HL4E_HalfLife_
UPDATE!!
Well i added a second layer of insulation today and i decided to redo the HX with pipe insulation. Doing this has gained me a few more degrees but i want to get -70f or more unloaded 1st stage before i continue on 2nd stage adjusting the charge should get me this.
This is the evap ill be using to make the load on the 2nd stage (pic4) and ill also be using this as the evap for the extreme freezer.
are you using a "J" thermocouple ? AFAIK J's are for high temp readings, they don't read below freezing.
Quote:
Originally Posted by wdrzal
yes i am and yes they do wdrzal.
J - 328 to 939 ° F 0 .1 ° F ± ( 0 .1% +1. 4 ° F )
940 to 1400 ° F 1 ° F
- 200 to 499°C 0 .1 ° c ± ( 0 .1% +0.7°C)
500 to 760 ° C 1 ° C
http://www.ueitest.com/images/Produc...-DTO150-PS.pdf
that has a range of -40c to 510c according to uei web site,if you are using a ATT19 probe that came with your meter
Where are u getting this info im not seeing anything like that on the uei siteQuote:
Originally Posted by wdrzal
BTW that info in my last post WAS from the UEi site.
Also what probe is the right one if this isn't??
go to their site and look under type j test probes probes, the att19 is the standerd probe with dt150, they call it" oven clip"
I got that off their site
i attached a screen of the pressures I found in a catalog.. take a lookQuote:
Originally Posted by rockdude14
Those are working pressures, but notice how dramaticly the pressure drops with a increase of diameter. you won't burst a small tube but a 2 inch tube made into a seperator can easily rupture.
i look but i don't see that anywhere post a link!Quote:
Originally Posted by wdrzal
Again what probe should be used?
I tried to post a link but it didn't work ,, go to uei home page....under product line,click on "probes and thermocouples"then scoll to bottom of page and click on "J type"
www.ueitest.com/product-j-typethermocouples.html try that
I think you posted the meters range before, you also have to check the probes range.
ok i see the probes now for J and K type and there all rated for -40c so wheres that probes that are rated for -200c?
I think this J type probe im using will do -200 it just may not be within the 0.1% accuracy as it is when its in the range that they got listed on the UEi site.
Ask chilly1 he sells those meters ,I not familiar with them. I know years ago type j probes had calibration problems below 0c but now with the advances in electronics I sure thats much better. Get your self a k or T type. but allways check the probes range, within a type their are severial different range probes available.
put it in a ice bath to see how close to 0c it is
IMO there's no point in doing -70f unloaded since as soon as you apply the 2nd stage load the hx will get all the way back to like -10c. All the liquid refrigerant will boil off as soone as it enter the evap and won't be all liquid but with vapor too.