1.5 HP single-stage = -62*C @ 225W

[n00b 0f l337]

^^
Some people want it for a few degrees lower BP, don't care about the pressures

[one_servant]

Speaking of impure propane...is there any way to synthesize propane in order to get a more refined, more pure gas for our systems? I’m guessing this is a project for a much larger lab but I thought I’d ask anyway…there are a lot of good minds on this forum.

[Brettbeck]

Just buy r290 propane from refrigeration stores, that will be pure.

LPG propane which most people use is about 95% pure, but it's allways worked fine for me.

[Clemmaster]

Not under load for us :/

Unloaded temps are really great ...

[Brettbeck]

Not under load for us :/

Unloaded temps are really great ...

Were you referring to my post? Maybe your r290 is a propane/butane mix... in which case it would explain poor loaded temps.

[Clemmaster]

No because pressures/temperatures mach to propane...

[Pansuu]

How long cap you use those temps? Can you tell what kind of mix was ref, fifty sixty, or something

[kayl]

Not under load for us :/

Unloaded temps are really great ...

i find bbq grade r290 fine for personal cascade holding load of second stage fine when HX flooded
also single stages as well, its not as good as other refrigerants though like r507, 4040a etc but is better than r134a for sure

[Clemmaster]

For sure in our applications, but it's far from having the same cooling capacity like R507c, even if pressures are lower. R290 maybe a good refrigerant (according to data on R290 compressors) but propan gaz we find in France in tankstations are far from being pur ^^

[kayl]

For sure in our applications, but it's far from having the same cooling capacity like R507c, even if pressures are lower. R290 maybe a good refrigerant (according to data on R290 compressors) but propan gaz we find in France in tankstations are far from being pur ^^

the Lpg used in cars is around 50% butane / propane which would result in a low pressure gas, but not very cold blend.
The best gas to get is from camping stores used for gas lights and bbq's.

[Clemmaster]

No I'm not talking about GPL (LPG for you :p), the blend we put in our car that are called liquid petrol gaz, but propane bottle (13kg) we use here to heat food when we're not using Butane or don't have natural gaz at home

[piotres]

How long cap you use those temps? Can you tell what kind of mix was ref, fifty sixty, or something

Hello

Captube is around 240-250 cm of 0.8 mm.

Mix is sth like R507=90% and R410a=10%.

Regards
Peter

[Clemmaster]

That's a well sized captube \o/

[HoriWanderFuLL]

hey mate thats like everryone says a nice build , but i really likethe neatness in the insulation so tidy in wrapping all them pipes up..must be tuff task having to insulate builds like these and a cascade.

[Pansuu]

Hello

Captube is around 240-250 cm of 0.8 mm.

Mix is sth like R507=90% and R410a=10%.

Regards
Peter

Ok, thanks mate. You have really good temps there

Can you remember lowside preasure in load?

[piotres]

Ok, thanks mate. You have really good temps there

Can you remember lowside preasure in load?

THX

No I don't remeber pressures .