Coldest Single Stage?

tjh566 · Dec 11, 2009

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__ · Dec 11, 2009

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.

tjh566 · Dec 11, 2009

-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 · Dec 12, 2009

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.

tjh566 · Dec 12, 2009

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 · Dec 13, 2009

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.

tjh566 · Dec 13, 2009

So the most practical way of getting "close" to this goal would be 410a?

NoL · Dec 13, 2009

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.

Coldest Single Stage?

tjh566

Member

Sam__

Member

tjh566

Member

NoL

Member

tjh566

Member

NoL

Member

tjh566

Member

NoL

Member

Similar threads