PDA

View Full Version : Single stage -40 C







Sawzer
16-09-2015, 03:20 PM
Hello, I have a small fridge and I need 1,5 kW of refrigeration power when it's temperature is -40C. What kind of gas would you use?

I tried with R404A, but the temperature can't reach -40C.

Any idea?

Thank you!

chemi-cool
16-09-2015, 03:33 PM
first you need a compressor that can reach -40, I would suggest R-507 or R-410A.

Sawzer
16-09-2015, 03:42 PM
Yes, it was the following question ;)
What compressor should I use?

chemi-cool
16-09-2015, 03:44 PM
A compressor with 1.5 KW capacity at -45C evaporating temp.

Sawzer
16-09-2015, 03:57 PM
Yes, but I didn't find anything with this specs. Can you suggest me something? (reciprocating or scroll)

chemi-cool
16-09-2015, 08:52 PM
Check Bitzer and Copeland semi hermetic two stages low temp.

Peter_1
17-09-2015, 07:08 AM
CO2 machine Bitzer, Dorin..

Aik
18-09-2015, 07:13 PM
A compressor with 1.5 KW capacity at -45C evaporating temp.
I think 1.5 kW capacity at -47C evaporating temperature... and it's may be two stage semihermetic compressor on R507/404

sterl
02-10-2015, 04:32 PM
You building a complete circuit or salvaging a small fridge or? 2-stage compounded will get you there and can be built up from pretty much stock pieces. Autocascade is the easiest overall arrangement but you would be buying a complete lab fridge.....Not something you want to design as a One-off.