[QUOTE=f00t]check out lardarse's end cap evaps. their very simplr to make and cheap too[/
End cap evaps? I think i know what ur refering to. Ill take a look around next time im at the hardware store.
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[QUOTE=f00t]check out lardarse's end cap evaps. their very simplr to make and cheap too[/
End cap evaps? I think i know what ur refering to. Ill take a look around next time im at the hardware store.
[QUOTE=_HL4E_HalfLife_]yeah i would try and make one of those. that flattened pipe business dosent look very promisingQuote:
Originally Posted by f00t
Not much to report today other than getting some end caps to use as my evap.Ill need to get my torch refilled either on saturday or monday i don't have enough gas left in it to put my evap together. :(
You dont plan on opening more than one of those valves (on the cap tube) at one time do you? It doesnt look as if you have enough on each one of those though looks can be devieving. Why didnt you buy a txv for the price of all those valves. It looks like you have a nice project over here. I cant wait to see the final product.
No only 1 valve will be open at a time.All the valves are used i just got em from the shop and they costed nothing.Quote:
Originally Posted by JSU
I saw ur post in my other thread,so now u really think im ready to be building this?
ya got the evap, now just need some co2 and ya cooling.
do you have a copper plate?? to fiinish it?
OMG I cant believe no one has answered what oil is for in a system. Oil in a system has to be compatible with the refrgierant being used. AKA. The oil has to absorb some of the refrgierant (i guess it would do this like water and co2). Once you pass the suction line and all the refrigerant is boiled off the oil which is cool goes into the compressor. It then continues to release any refrigerant left in it which cools down the compressor. The reason for doing it this way as apposed to having liquid come into the compressor is b/c liquid is not compressable and the oil which the refrigerant absorbed in it i guess is. It seems like the oil takes the refrgierant from a hp absorbed liquid to a lp gas. Hermetic compressors work this way. Rotarys dont fully benefit from this therefore you have to make sure to have a lower superheat than normal.
Does my opinion effect the building of this? :DQuote:
Originally Posted by _HL4E_HalfLife_
Quote:
Originally Posted by kayl
The new Canadian Tire store that just opened here (biggest one in the province) has co2 tanks for paintballs so im gonna get a 20oz for $54.99 and is refillable is that a good deal?
Kayl its not here at home but theres some 2" ID caps at the shop ill just cut the sides off 1 of thoes.
For the evap i saw that the one stockhatch did of the lardarse's evap he drilled large holes in the side of each end cap. I have a bit different idea for that what if i drilled 4 smaller holes on each side and drill them on an angle so the liquid will be forced down toward the base of the evap would that be more effective?
Quote:
Originally Posted by JSU
So what are you saying JSU are u saying i did something wrong with the oil? :confused:
no, you guys were just wondering what oil does and why you have to have it circulate.
Its better not to have the oil circulate, however when you cant stop the oil circulating it needs to be miscable with the refrigerant in order for the oil to be returned to the compressor, its sole purpose is to lubricate the moving parts, not to aid with cooling of the compressor. Thats the job of the suction vapour and the condensor fan also aids here.Quote:
Originally Posted by JSU
Regards
John.
sorry thats not the case. iam sure they could come up with a way of lubricating the compressor without having the oil circulate. btw chilly1 told me about the oil being used to cool the compressor ;) .
Ok good. So about my evap would doing what i said in the previous post help or no?
Its called an oil seperator ;) But the ideal would be an oil less compressor.
Oil circulating coats the condensor and evaporator reducing their efficiency.
Trust me, Chilly1 would love a fool proof and cheap method of not having any oil circulating :D
Regards
John.
It certainly wouldnt do any harm, although I doubt the thickness of the end caps would really direct the refrigerent towards the base
Regards
John
Thats what ill do than and see how it works.Quote:
Originally Posted by pythagoras
look at cryonic refrigeration , they use asorbers, they are sponges for oil, the problem is they don't release it,they are expensive and not reusable,they must be changed and oil has to be added to the pump.
UPDATE!
This update is just redoing some stuff to stage 1. I've been having some problems with the temps sometimes it only goes to -20c other times it goes to -40c the point is the temps were all over the place and wern't stable at all so i recovered most the 402A from the system and once it was all out i changed the filter drier (new one in pic) this one is a bit longer then the last one. I also removed a bullet piercing valve from the suction line and brazed on a T and a schrader valve.
After that was all done I vacuumed the system with the duel compressors and i ran the torch over all the lines and the condensor to help remove all the moisture than recharged the system. I had the first valve open (15" captube) and the temp went right down to -43.5c and stayed there thats pretty dam good for 15". I closed off the first valve and opened the second valve (20"cap) and the temp droped down to -47.3. So being pleased with the results so far i closed off the second valve and opened the 3rd (30" cap) and thats where i stoped. See 2nd pic for reason (The Thermometer's low limit is -50c.) Ill have to buy a meter that can go down to -120c at least before i try that last 2 valves.
Ps. Sry about quality of 2nd pic i had to turn the flash off otherwise u can't
read the guages :(.
BTW what is the record on xs for the lowest first stage temp?
Nice results... good work :D
oil seperaters are not used in single stage hermetic compressor systems. With the second stage of a cascade the suction line is much colder than normal allowing more cooling so you dont have to rely on the oil to cool the compressor. We would all like a oil less system but thats the way these are designed to work ;)Quote:
Originally Posted by pythagoras
Can anyone conferm the boiling point of R764(sulfur dioxide) im getting mixed results about its bp.
Here is said that its bp is -76c
http://www.wc101.com/guides/refridgeration/page6.htm
Here its said that its bp is -10c
http://www.xtremeresources.com/forum...chmentid=11714
If it is -76c thats good because i have access to R764
Wikipedia claims -10C.
Yeah and isnt it quite toxic? Weren't you going to do Co2 like kayl?
sulphur dioxide is terrible stuff to work with.. ruins vacuum pumps and yes, its toxic.
I guess they should correct that bp than. I had asked a while back with no answers :mad: if adding some Nitrogen to the co2 mixture will lower its bp since Nitrogen has a much lower bp (-195.9c)?
Also I think im using 0.028 or 0.026 cap tubing what should work better?90"(7.5 feet) or 120"(10feet)