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post #11 of 18
http://www.directindustry.com/prod/cubigel-compressors/hermetic-refrigeration-compressors-30988-281878.html

http://compressorcatalog.blogspot.com/2011/07/cubigel-compressors.html

http://www.cubigel.com/java/X@cgi=cubigel.home.Home.pattern.html

http://www.cubigel.com/cubigel3/pdf/User-Manual_GLT80TDC_OK.pdf

last 2 are their site, and the 24v one that I think is likely to be what you're look for? That's an 8cc or so, mbp but will do -25 according to spec, and lower most likely quite easily.

Falls into the range we'd use for things, variable speed is cool. 12/24-42v is versitile. I actually have a 48v PSU here I have no real use for biggrin.gif looks like a meanwell (anser) and adjusts. not sure if you could scale down as far as 42v but it does 15amps. Could actually work.

Yeah, for a variable compressor you need a high powered PSU. Sounds like a minimum 5a/12a LRA on 12v. So not terrible. A regular PSU can normally do it.

The old Vapo's with 12/24v Danfoss were like that, smaller compressors in the 3-5cc range. Bit small.

Any of that help?


Gray
post #12 of 18
Thread Starter 
Yeah that helps a lot! Looks like Cubigel has some really good products. However, I don't think the model I looked at was a DC model because I didn't see a control area like most DC compressors have. The .pdf you linked is awesome and makes these look very good. I may just have to do some more searching to find the right compressor.

I also found another repair place on craigslist that has really cheap refrigerators of all sizes. They seem like they have a lot of turnover of broken units and spare parts. I will be checking with them today or tomorrow to hopefully find a compressor with specs I am more familiar. If not, I guess I could try ordering one online, but that would be more expensive.

Best,
Dizzy4

P.S. If anyone knows about some good scrapping places in San Diego or lower socal, let me know. I also need some gauges and tools, but I assume the Home Depot or Lowes would have what I needed. I am ready to build this sucker!
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post #13 of 18
If it's your first build, go simple.
I still suggest going and picking up a 6000btu window ac.
It's a $100, you get compressor, condenser, a spare condenser (evaporator if your careful with it), fan setup, plenty of work space, and a case! Easy to tune and tons of condenser so you don't have to worry about part sizing for the most part.
post #14 of 18
Thread Starter 
Quote:
Originally Posted by NoL View Post

If it's your first build, go simple.
I still suggest going and picking up a 6000btu window ac.
It's a $100, you get compressor, condenser, a spare condenser (evaporator if your careful with it), fan setup, plenty of work space, and a case! Easy to tune and tons of condenser so you don't have to worry about part sizing for the most part.

That is something to consider! The only issue would be the power input required and the noise. As I said before, I live in a small apartment in an old building, so something too noisy or too power-hungry just won't do. Do you have any suggestions of a unit that might be more efficient and quieter than others? If it saves me money and running all over to get the right parts, it would be something I would be even more interested in.
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post #15 of 18
The small units when charged properly can be fairly quiet. They already have diminished or low power fan settings.
But ultimately if you are going to spend money, get the experience of building underway and done right. It's the founding steps after all. You can always use it for parts later, or convert it to a recovery unit, or even use it as a low or high stage in a future cascade. I love AC condensers and constantly source up parts that way when ebay's not providing me what I need. (Then again these days I've got about $50k in inventory in the shop.... rolleyes.gif)
Oh the joys of phase!

When it comes to noise, a lower compression ratio will lower power consumption and noise from a rotary.

That means the high side pressure (+1 bar for atmospheric pressure) divided by the low side pressure (+1 bar for atmospheric pressure).

So if you use r507a in a rotary, and for max temps your pushing it and its at -5 psi low side (a bit in vacuum), and 240 psi high side. You've got 255 psi absolute high, and 10 psi absolute low. 17.6 bar and .7 bar then. That's a compression ratio just over 25:1. It's immense! A window air conditioner may be running 220 psi high side, and 70 psi low side. So again, 235, 85; 16.2 and 5.9 bar absolute respectively. Compression ratio under 3! Incredible difference, tons less work on the compressor itself. So less power, less heat, less noise.

If you want to avoid capillary tube you can pickup a CPEV, or you can build a liquid chiller out of the AC to learn the building process and easy tuning with a TXV and plate heat exchanger (probably cheaper then a lineset and evaporator). That's as close to plug and play as it can get really! One of my first units was a liquid chiller constructed just that way. I should find pictures. Still has it's Iwaki pump attached and all that....

Might make a great give-away item...

Feel free to PM me if you have other questions as well as time goes on, I check that box all the time more then the phase section at times.
post #16 of 18
If you live in a small outdated apartment where are you going to build this?
Also can you run a dryer or refrigerator in your apartment? Does your apartment have central heat and air or do you use wall units to cool your self during the hot summers?
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post #17 of 18
Thread Starter 
Quote:
Originally Posted by Sdumper View Post

If you live in a small outdated apartment where are you going to build this?
Also can you run a dryer or refrigerator in your apartment? Does your apartment have central heat and air or do you use wall units to cool your self during the hot summers?

We have a large yard with a little project area. It's actually an old house (circa 1900) that was converted to apartments so there is no central heat. We have a gas heater, but hey it's San Diego.. it doesn't really get that cold. We do have a refrigerator, so that made me think there should be no problem with a small reciprocating compressor. The AC units are usually a lot more power hungry from what I have seen and some can draw more than 800w from the wall. I am sure they disallow it because not everyone has the sense to get an anergy efficient model, but efficiency is key to me. Especially when the price of electricity here is pretty high too.
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post #18 of 18
I dont think your going to have an issue with power draw.
Your PC is more likely to draw more power than your phase unit will.
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