what is the best copressor +gas? to get -65/-75c'??

[ye_3333]

hello guys..
i want to make phase change cooling....with one compressor.
and i want to know what is the best compressor and gas to get -65/-75c'?
thanks

[Tyrou]

-65 in a normal single stage is not reachable (except chilly super vapo, but no clue about his under-NDA gas)

[Sheograth]

Well, chillys work proves its POSSIBLE

[ye_3333]

ok........ so you still didnt tell me what is the best copressor and gas? and wich temp i will get?
thanks..

[MeTsU]

-65 in a normal single stage is not reachable (except chilly super vapo, but no clue about his under-NDA gas)

LOL - sorry for the question, what's NDA mean?

[wdrzal]

LOL - sorry for the question, what's NDA mean?

no disclosure agreement

[MeTsU]

no disclosure agreement

Thanks!

I always feel like a fool asking, but you will never learn if you don't ask!

What would a 1HP and R1150/R1270 mix get you? That's if I could get those gasses (South Africa).

[wdrzal]

have you ever built a system?

[ilkkahy]

Well, chillys work proves its POSSIBLE

Evaporators temperautre without load isnt quite what this guy is looking for if i understood right.

You will need one damn big compressor or to make some kind of autocascade system. One stage -60c system with one compressor would stress the compressor pretty much too. Im not familiar with autocascade system yet but it seems very brilliant.

[MeTsU]

have you ever built a system?

You asking ye_3333?

[wdrzal]

You asking ye_3333?

no you, is this your first system?

[craig588]

1150 is not a first stage gas. IIRC it requires a temp of 3C to condense.

[MeTsU]

no you, is this your first system?

Yes. But obviously you already knew that:

1150 is not a first stage gas.

Sorry, my bad...sorry about that guys.

[wdrzal]

I just was going to bring up what I keep saying about over reaching, first it can be dangerious,second if your not familiar with a simple loop using a single gas your chances of getting a complex rig or mixtures to work right is small.

[MeTsU]

I just was going to bring up what I keep saying about over reaching, first it can be dangerious,second if your not familiar with a simple loop using a single gas your chances of getting a complex rig or mixtures to work right is small.

Ye...I think I was just excited, as I've been wanting to get into phase for a while, and now that it finally has become an option, I went in too deep.

I'll proably try source a 1/2HP or 1HP compressor.

Sorry if I've hijacked your thread ye_3333!

[wdrzal]

to big a compressor will do more harm than good, remember its a system.While everyone talks about compressors and gases,every componate must match the others to work right.

[masterofpuppets]

1hp is really the largest you would need for this sort of system. 1/2 maybe.

[MeTsU]

So, you guys would reckon a 1/2HP compressor should be fine. Coupled with what gas? R402? What sort of temps unloaded would I be looking at?

[js530]

For a first stage, R134 or R290 (propane) should be easy to get. R134 comes in cans at the auto store, under $10 for a pound. You should get around -20 to -30C, maybe lower with a mix of the two.

[craig588]

Don't touch R134a. For a first build R290 should be good because it's very cheap, can be vented, is legal to get without any EPA certs, and can give you -40C easy.

[MeTsU]

Don't touch R134a. For a first build R290 should be good because it's very cheap, can be vented, is legal to get without any EPA certs, and can give you -40C easy.

Ok, so R290 on a 1/2HP compressor should get me -40C idle or loaded?

[craig588]

Idle. You need to play with R507 or R402a to get those types of temps loaded. (You need an EPA certifiaction to get those, they are also more expensive than propane)

[bxa121]

personally 1/2 hp i think is overkill.. look at the vapo chilly! did up!

[saratoga]

Yeah a good system should be effcient and powerful. Thats I wouldn't go over 1/2, and 1/3-1/4 or so would be even better (IMO).

[illmatik]

Idle. You need to play with R507 or R402a to get those types of temps loaded. (You need an EPA certifiaction to get those, they are also more expensive than propane)

I think he's in South Africa, so EPA cert probably doesn't apply.