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Thread: Cascade -90 ° C
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01-02-2013, 07:54 AM #1
Cascade -90 ° C
Greetings to all
I retrofitted a unit cascaded to the second stage with a final temperature of -90 ° C. the system had a load of 1 kg with 0.1 kg R503 R12.
I replaced the oil with oil poe, and primed, 1 kg 0.1kg R23 with R134a.
after the test run the final temperature reaches -65 ° C.
can someone help me with similar experiences?
which you think may be the right mixture of refrigerant retrofit?
Thank you.
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10-02-2013, 08:37 AM #2
Re: Cascade -90 ° C
experts please help me.
& thanks in advance
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10-02-2013, 10:51 AM #3
Re: Cascade -90 ° C
With R134a is quite impossible to reach -90°C.
You had to use R23, but then again it is impossible to say, unless you give complete description of components, exchangers and compressors of the two stages.
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10-02-2013, 01:03 PM #4
Re: Cascade -90 ° C
You can use ethylene for 2 steps, if you find)
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11-02-2013, 07:01 PM #5
Re: Cascade -90 ° C
Thanks for the answers
What do you think if I use the refrigerant R508B?