First use of Rotary Compressor, advantages/disadvantages.

[godsgifttoearth]

im in the process of making a chiller, i picked up a brand new 12,000btu rotary compressor for pennies. i have never used one of these before, and i was wondering what the advantage of using them is, or the disadvantage?

i have noticed whilst playing with it that its far noisier than my NL11! and its pretty small considering its capacity.

cheers :)

[dinos22]

i have a 1HP single stage

it's :banana::banana::banana::banana:ing loud as anything :D

it chews power

but it cools like a mofo

how's this for an example

4.8GHz 1.76v QX9650 quad core during wprime -45C on evap on 22C ambient :) :up: and i only have R290 in there from my barbecue bottle :D

[tim-]

you have already mention the disadvantage, those are noisy.

but the advantage is that they are very compact (if the height doesn't matter) and they have an built in suction accumulator. other then that you have a compressor with good capacity to make vacuum, we like that.

[godsgifttoearth]

sounds good. only problem is i have to try and get a hold of some r410a, anything else i can use without an oil change, that gives better temps? i dont have a silly hvac certificate thing, so i have to try befriend engineers to either gas it for me, or sell me a small canister of whatever, they're usually very reluctant to gas a DIY contraption themselves!

infact how does this perform? its pretty common isnt it?

[dinos22]

they also get a lot hotter than normal compressors

[teyber]

sounds good. only problem is i have to try and get a hold of some r410a, anything else i can use without an oil change, that gives better temps? i dont have a silly hvac certificate thing, so i have to try befriend engineers to either gas it for me, or sell me a small canister of whatever, they're usually very reluctant to gas a DIY contraption themselves!

infact how does this perform? its pretty common isnt it?

im afraid you will not find anybody who will do that. thats like in the old days getting a doctor to give a abortion(when it was illegal), they did not want to risk loosing their licsense. Its to risky for them my friend... Just take the 25$ open book online exam. Every time you fail its only like 7$ more. Its not the complete certification, and yo won't learn very much(its open book for heavens sake!:ROTF: ) but you will be certified to buy basic gases.(all the gases for your chiller, for the most part). However getting your full cert, which means taking class and proctered exam never hurts.

About rotaries, i believe they use more power, they have a very efficient, great design, they are loud as he77, They are very powerful, and you can find them super cheap(are in window a/c's).

If you can take the noise, or sound-proof an enclosure, they give some great results:up:

[[XC] gomeler]

Their compressor shells get hot as hell.. I've seared my hands a few times while working around a running/cooling rotary before. 70C-80C compressor temps were often seen and that was with some huge fans blowing over the shell. Great for cascades where noise and heat isn't an issue though :up:

[boshuter]

They are hard to change oil in :yepp:


As of now you can buy some gases without certification, r507 and r410 are a couple that you can get without certification. Only problem is, you have to buy at least 20lbs. I don't know how it is where you live, but I have no problem finding small quantities of refrigerant from helpful techs ;) My problem is they don't have any good second stage gases. ;)

[jinu117]

Actually in US no one who isn't EPA certified is allowed to handle any refrigerant... :) Wonder why R-134a is exception to rule it seems :P

[Xeon th MG Pony]

Rotories offer a smooth compression
Small package
High power densities

Cons max 5:1 compression ratio
Runs hot
like all other compressors should never be run in a vacuum

[PhilippF]

Is it possible to run a rotary horizontally? There are new rotaries from L'Unite/Tecomseh than can be mounted horizontally, but are they somehow different built or do they just have other mountings?

Would be very useful to mount a rotary horizontally... but my gut tells me this will be an oil problem. Has anyone founded knowledge?

Regards,

Philipp

[Xeon th MG Pony]

Is it possible to run a rotary horizontally? There are new rotaries from L'Unite/Tecomseh than can be mounted horizontally, but are they somehow different built or do they just have other mountings?

Would be very useful to mount a rotary horizontally... but my gut tells me this will be an oil problem. Has anyone founded knowledge?

Regards,

Philipp

YEs they are engineered differant, the oil distrobution system is differant berings are differant, intake system is differant.

[PhilippF]

Thanks, the idea was too good to be true...

Has anyone tried one of the horizontally L'Unite/Tecumseh compressors yet? I found an old thread from long a go where someone tested a China brand horizontally rotary but as far as I remember got nowhere with it. Was it Kayl?

[gosmeyer]

Yes, that's who posted it first here.

[godsgifttoearth]

Just take the 25$ open book online exam. Every time you fail its only like 7$ more. Its not the complete certification, and yo won't learn very much(its open book for heavens sake!:ROTF: ) but you will be certified to buy basic gases.(all the gases for your chiller, for the most part). However getting your full cert, which means taking class and proctered exam never hurts.

If you can take the noise, or sound-proof an enclosure, they give some great results:up:

the only test i can take in the UK to get the required certs are like £200. The online certificates arn't recognized in the uk. i managed to get some r404a last year. think u still need the qualifications to get that aswell.

i was planning on sound proofing the enclosure as best as possible. its not actually that bad. the frequency is quite low and meaty. lower that than of the danfoss i have. so should be easy to ignore.

i've read all the mentions of them running pretty hot. do i need to worry about any direct airflow over them? ive got about a million little ramsinks in a bag somewhere. always wanted to find a use for them. maybe some kinda cylindrical spikey compressing device might be their calling?

[Xeon th MG Pony]

With new F gas laws and such you'll be needing a whole lot of certs city and guilds for example, non of the US certs are reconized here either fyi.