Danfoss SC18CLX.2

[Sgrios]

I bought a NF11FX from Ron, however I wanted to know if any one has a source for SC18CLX.2 compressors?

I've checked Ebay for new SC18CLX.2 compressors, and came up with nothing. Could I order a SC18CLX.2 compressor directly from Danfoss or do I need to go through supply store?

Any help would be great.

[[XC] gomeler]

Awww man. He pulled the bulk auction and listed a few single compressors a few days back, thought he would keep them on ebay

[sjg0]

just email mingo120 I think is his ebay name... im sure he will be happy to help you.

[teyber]

yeah there was a ebay guy that had em for $50 shipped... can't believe he doesn't have em any longer :O

[sdumper]

These are great compressors

http://cgi.ebay.com/New-Danfoss-SC18...3%3A1|294%3A50

[[XC] gomeler]

Awesome! So glad they are back up again In for three!

[Shingoshi]

These are great compressors

http://cgi.ebay.com/New-Danfoss-SC18...3%3A1|294%3A50

So I want to know, based on this project (http://www.xtremesystems.org/forums/...d.php?t=231006), should I only need one of these, or two?

[[XC] gomeler]

Do a little research. Find the spec sheet and see if the compressor will satisfy your goals.

[Snowman89]

These are great compressors

http://cgi.ebay.com/New-Danfoss-SC18...3%3A1|294%3A50

Looks like a really good comp, to bad its so far away

[Shingoshi]

Do a little research. Find the spec sheet and see if the compressor will satisfy your goals.

I had already downloaded the Danfoss RS+3 file. And on examination of it, I determined this was the compressor I need. I plan on getting two of these and running them in parallel. That will give me the capacity I want for another experimental setup I want to try.

EDIT: It seems this item is no longer available!

Shingoshi

[Shingoshi]

But I can't find what the maximum safe working outlet pressure is for the SC18CLX.2

If someone here knows what it is, please tell me.

Shingoshi

[Stelios]

http://rc.danfoss.com/TechnicalInfo/..._ed400m202.pdf

Max. condensing temperature continuous (short) °C 50 (60)
Max. winding temperature continuous (short) °C 125 (135)

That would be around 325psi continuous and 418psi short .

[Shingoshi]

http://rc.danfoss.com/TechnicalInfo/..._ed400m202.pdf

Max. condensing temperature continuous (short) °C 50 (60)
Max. winding temperature continuous (short) °C 125 (135)

That would be around 325psi continuous and 418psi short .

I think that definitely covers my project's need.
Which one of the vortex tubes on this page will the Danfoss provide enough flow for?
http://www.airtxinternational.com/st...tex-tubes.html
The SC18CLX.2 will be the second stage with four parallel connected Rechi compressors in the first stage.
So now I need to know, "what's the CFM of the SC18CLX.2 in combination with four parallel Rechi compressors?

Shingoshi

[teyber]

I had already downloaded the Danfoss RS+3 file. And on examination of it, I determined this was the compressor I need. I plan on getting two of these and running them in parallel. That will give me the capacity I want for another experimental setup I want to try.

EDIT: It seems this item is no longer available!

Shingoshi

paralllel? you don't see it done for a reason. overheating / check valves / oil balancing problems its near impossible

[Shingoshi]

paralllel? you don't see it done for a reason. overheating / check valves / oil balancing problems its near impossible

I didn't come up with this on my own. Although, I had thought about this some time ago. I was inspired by the way scuba tanks are filled at very high pressures using both a cascaded and multiple unit pumping assembly. You'll find similar arrangements in hydraulic systems as well.

The problems you raise are valid. But given the capacity required by this system, those problems will have to be dealt with. Instead of having two of the SC18CLX.2, I have already purchased four Rechi compressors to run in parallel. Those four compose my first stage. The Danfoss, provided that I can get it September, will be my second stage.

Where do you see the problem of overheating existing the most? Do you mean with the bodies of the compressors themselves? Or is it a matter of the gas leaving the compressors? I guess it could be a combination of both. But which of those poses the greater problem?

Shingoshi

[teyber]

captaincascade is a refrigeration genious and a great guy. do a search of his threads, he isn't active now but he had one about dual compressor overheating problems- with a dedicated chiller to just cooling the compressor. the overheating in this case was in the oil getting so hot it would loose its lubricating properties- yikes!

Im not out to get ya mate or anything, just trying to save you some compressors. Drewmeister has a couple posts on the dificulty of oil balancing in paralell compressors.

cheers

[Shingoshi]

captaincascade is a refrigeration genious and a great guy. do a search of his threads, he isn't active now but he had one about dual compressor overheating problems- with a dedicated chiller to just cooling the compressor. the overheating in this case was in the oil getting so hot it would loose its lubricating properties- yikes!

Im not out to get ya mate or anything, just trying to save you some compressors. Drewmeister has a couple posts on the dificulty of oil balancing in paralell compressors.

cheers

You may not have noticed two very important factors in my build.
1.) My system is being built inside of a closed case. A Pelican 1780 Transport case to be precise.
2.) That case will act as it's own freezer. You've already seen my other thread. Go through it again carefully. The cold of the system won't be limited to the cooling blocks. They too will provide a degree of ambient cooling inside of the case. As will the heat-exchangers also. And as much as I don't like it, I now realize I will need three of them, not just two. Even with them insulated, they will still absorb some heat from inside the case.

And then there's the issue of the scuba tanks. We're talking about a large insulated container of refrigerated liquid-coolant (a dewar). The tanks will be another source of ambient cooling. Because no matter how well I insulate all of these components, they will still absorb heat. But really look at the temperatures involved here. The first vortex tube will have a cold outlet temperature of -40F, under typical conditions. That will also be the inlet temperature of the second vortex tube. Based on my calculations, I'm thinking the cold outlet of the second vortex tube to be about -150F. One thing is for certain. The second vortex tube will produce even lower temperatures than the first. Go back and see what I had to say about that.

I'm working on covering my bases. And I'm still at it.

Shingoshi