Stupid question

[Royal241]

Is there such a thing as a refrigeration system with 2 different refrigerants (***** type) and if so, what is called? Thank you for enlightening me

[The Viking]

Cascade.




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[RANGER1]

Not a stupid question at all.

I believe its called a cascade system or in some cases a secondary refrigerant.

Cascade for probably low tempreture application where one system cools condenser of the other.

Secondary refrigerant could be

example R22 system on a boat cooling secondary refrigerant of R11 (older units of course).
Ammonia or ***** cooling CO2 for secondary refrigerant

[Royal241]

Thanks guys, I thought so, was unsure, this was a question on my license exam and I answered "cascade" but never seen or worked on something like that, but made sense and it's clear now, thanks again, btw, I'm sure I passed, this was bothering me though

[Tayters]

If you want to get picky i suppose any system with a 400 or 500 refrigerant would have more than type seeing as they are blends.

[Goober]

There are single systems with different refrigerants that have different boiling points, ultra low temp units use them. As I understand it, as one refrigerant boils off it sub cools the other, or something like that. Never have been able to get my head around it, but have seen them in action and definatley only one compressor.

[sedgy]

yes even a water chiller could be considered as using a second cooling agent ( water)= sedgy

[river1710]

hi ive been reading some book were there is 3 stage casscade system to get to ultra low temp

[glenjames]

Two or three stage cascade where the refrigerants are in separate systems connected by heat exchangers, auto-cascade where the refrigerants are mixed in together. Auto is most common on small lab storage freezers. Works a bit like "glide" but on a bigger scale.

[ezzat]

for R404a glide = 3k

for R407c glide = 7k

all zeotropic mixture , safety = A1/A1