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Coldest Single Stage?

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tjh566

Member
Joined
Jun 24, 2003
Location
Va
I built a single stage not too long ago, it hit -30c, i charged it with 404, I was wondering how cold a single stage can go with a decent sized heat load and how to do this.
 

Sam__

Member
Joined
Mar 12, 2007
Location
UK
as far as i know it depends a lot on the components you use and the gasses.

coldest i have seen are custom rotary builds in the -55 area.
 
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tjh566

Member
Joined
Jun 24, 2003
Location
Va
-55 would be sweet, i got a rotary sitting in the garage I can use.. what gas should i use to reach those temps?
 

NoL

Member
Joined
Jun 3, 2006
Location
NJ, USA
Not that simple.
It's a balance of load versus temperature, and even then, going deep into vacuum will in quick time destroy your compressor internally.
 
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tjh566

Member
Joined
Jun 24, 2003
Location
Va
Althought My questions/statements seem noobish there is no need to dismiss. I do have Hvac field experience but this is different than say a rooftop unit, My experience Is lacking with this extreme low temperature area.

Say I wanted -55c with a 200watt-ish heat load, what refriderant would be best suited for this application?
 

NoL

Member
Joined
Jun 3, 2006
Location
NJ, USA
In any situation like that, something that boils COLDER then -55C @ 1atm.
Say... R23. Or R170.
You truly do not ever want to run in sub 1atm conditions "0 psi" on the low side.
 
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tjh566

Member
Joined
Jun 24, 2003
Location
Va
So the most practical way of getting "close" to this goal would be 410a?
 

NoL

Member
Joined
Jun 3, 2006
Location
NJ, USA
R410a boils at -51.6C at 1atm.
So it would still need to be run into a vacuum.

R410a is also VERY hard to condense, a warm room will run you up past 300 psi.
That makes a very unhealthy system.