I'm low on options for a 2nd stage gas to use im on a very limited budget so i can't afford any 1150 or Co2. :( Has anyone tried using R22 and adding a small amount of helium or another extremely cold gas to lower the boiling point? Would it work?
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I'm low on options for a 2nd stage gas to use im on a very limited budget so i can't afford any 1150 or Co2. :( Has anyone tried using R22 and adding a small amount of helium or another extremely cold gas to lower the boiling point? Would it work?
Quote:
Originally Posted by _HL4E_HalfLife_
sight glass does come in handy no guessing.
mainly say that casue ya had low pressure with not good temps.
but a loose probe does it to ya. i found 8degs on the autocascade attacked right.
i had the same problem when i did my first cascade temp probe only going to -50c, unless you can make one ya really forced to get one other wise guessing temps. look on ebay that not too dear if order them from the US. Under 140us.
how expensive is c02 in your country, the welding stuff is normally dirt cheap.
really all the cascade gasses are expensive except c02. what about really low grade of 1150 like the 99% stuff is cheap compared to 99.5? after that it gets way more expensive.
I have no clue what it costs here kayl and i wouldn't know where to look for 1150 or the co2.
As for the thermometer is it possibile to remove a low temp limit? like im sure the probe would read below -50c but its just that the thermometer isn't displaying it below -50c
run over to canadian tire and grab a paintball co2 cannister. a 20oz one is about $60 and to fill it is about $10
Yes its a lot of fun trying to source cascade stuff in your own town.
I know im the only person in Australia doing cascades so no one to help me source stuff.
Its a lot lot harder than ppl think. Have to get account etc and enquire etc.
Some places they wont even let you get 1150.
Gkiing is from Canada and he got a bottle of c02 for his autocascade project.
http://www.xtremesystems.org/forums/...2&page=1&pp=25
From memory stuff in Canada and Australia is similar prices what gkiing said. I think he rented his bottle, give him a pm or something more info if helps.
You should be able to get most gases needed (well at least ethane, co2 and ethylene) from aire liquid or boc gas, they are located all over the word in different countries.
Im getting mine from boc gas, just get an account and order what you need over phone, can even have it delivered to your house.
I wouldn’t buy regulators through them, cost too much, get them through a torch store and just an industrial one, a lot cheaper.
Also with the temp gauge, the sensor may read lower temps, but you will need to map the voltages to relate to a given voltage.
The reason why they limit the meter to -50c as not read that accurate. The -50c meters arnt always accurate anyways.
You only need one good gauge, then get xtra probes and its like you have several metres
Hmm that all sounds interesting. This co2 cannister for paintball guns how would i connect it up to the gauges? would i have the braze a check valve on it?
Well i got alot of stuff coming in over the next week or so, 2 more A/C's with 12000Btu rotarys and i got this compressor today (in pic) no cost 11300Btu's 115v 50LRA.
where are you getting all this stuff from? it took me 3 months to find two good compressors for my cascade.
as for a c02 bottle. go to your local air liquid supplier/ welding supply shop. they can definetle hook you up with some c02. if im not mistaken, a regulator is about $90/ bottle $200 (i think)/ and a fill is about $50 for small personal bottles.
i made my co2 paintball adapter from one of those propane torch thingys. i got a fitting for the paintball bottle, brazed it onto the bottom of the torch thing, trimmed the central shapft down a couple of mm, and brazed a shraeder onto the top
Hehe at the shop where i work its a gold mine theres compressors there that range from being brand new to being 20 years old and 20 year old compressors weather they have been used or not won't installed in a system anytime soon such as the compressor i got today its ment for a window A/C and nowadays you won't see a window A/C with a recipricator compressor you'll see a rotary. Next time im at the shop ill take a few pics and post them here.Quote:
Originally Posted by f00t
I've already went to a gas store and to buy co2 from there u need to start a contract which is $80 and u have to pay that each year to get the tank serviced so im not doing that i think ill look up on the paintball co2 cannister because thats all ill need.
you can purchase a tank, then just pay for contents. I own every tank I have and thats quit a few.
Still buying a tank u need a contract from them i asked and thats what he said.Quote:
Originally Posted by wdrzal
I just found this so this is what im gonna get. :D
http://www.canadiantire.ca/assortmen...romSearch=true
Today i got those 2 A/C's i mentioned in a previous post. I had to replace the run cap on 1 of them to get it going but other than that they both work. There both identical 12000Btu 1hp rotarys 62 LRA 12 RLA 115v they both have the exact same rotary as the one i got on my first stage :D.
I just got a 20LBS bottle for about 150$ cnd @ BOC GAS they probably have a store near by. The bottle is mine and when I need to fill it up, it will only cost me 35$. I had no contract or anything else to do with thems just passed by and asked for 20 lbs co2. He even gave me a nice cga320 to cga 580 adapter for free...
What oil should be used with co2 anyway?
Edit: What do you guys think about this oil separator? would it work?
CO2 doesn't catch any oils, that's why it's better to use R134a/R22/R290 for oil transporting
I don't think that idea should work fine :
- it's horizontal, the power of gravity works weakly
- too small area for dropping droplets (only two pipes)
- the flow of refrigerant should transport droplets which layed on bottom of this wide pipe to separator's outlet
I would go to classic oil separator, vertical and wide pipe filled by metal wool
So why would i want to use an oil separator if co2 doesn't carry any oil? Again what oil should be used?
This is the thing man...you don't need an oil separator in a co2 auto-cascade. You need one in a co2 cascade because the carbon dioxide dosen't carry the oil well. You can use hydrocarbon and fluorocarbon based oil.
But why would u want to carry the oil? all the oil is for is to lubricate the compressor not to travel through the system. What is hydrocarbon and fluorocarbon based oils? MO? POE? AB?Quote:
Originally Posted by Cr@sh_D1n3r
You wand oil to be carried in the part of the circuit that oil is required, your compressor. Therefore you want the oil to be carried:
Out of the compressor --> to the oil separator --> back to the suction line --> and into the compressor.
This will ensure complete lubrication of the compressor as the oil is dispersed in the refrigerant in the 'oil circuit'.
If you had oil that didn't freeze up and block the system, an oil separator would be unnecessary, and in single stage systems the temperature isn't cold enough, so oil sep's aren't used.
As for compatibility of oil, I'm curious myself, as I'd like to use R22 and 508b in an autocascade, and I'm unsure if they are fine using the same oil. POE was the oil I'd planned to use.
Gray
On a normal phase-change system there's no oil separator because the refrigerant carry the oil by it self. I guess you will use r290 so just make your phase sep and propane will take care of the oil transportation. If you want to build one go ahead dude but I'm telling you, you don't need one. You can use mineral and poe oil with it.
Hmm from what i know compressors are self-lubricating at least recip ones are they pick up the oil from the bottom of the shell and up through the shaft to the bearings just take a look at the video i posted in another thread heres a link.
http://binary-side.net/tmp/opencompressor.avi
ok then, build a system and fill with propane and let it run for 2 hours. Then make all the gas leak from the discharge and you'll end up with an messy oily pipes.
Youve got nice ac units there. Hope you will make it!
Dude i know oil travels in any regular system im not stupid and i think ur misunderstanding what my point is. My point is if co2 doesn't carry any oil like u say than an oil separator shouldn't be needed because all the oil will remain in the compressor.If u watched the video i posted u see that recip'sQuote:
Originally Posted by Cr@sh_D1n3r
are self-lubricating im just not 100% sure if rotarys do the same thing. Im gonna cut the top off my old rotary compressor i used as a vacuum pump and find out of they do self-lubricate.
sorry I didn't meant to piss you off...lol dunno why I thought it was a autocascade for a moment sorry :P. If you use co2 as 2nd stage then you need to put some propane in it because you will end up with a clogged evap because dry ice will form in it. I'm not sure that under pressure the compressor isn't blowing oil through the discharge. Some expert could help us on that one.
I don't have any 290 will some 402A be fine?