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Thread: Single stage -40 °C
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16-09-2015, 03:20 PM #1
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Single stage -40 °C
Hello, I have a small fridge and I need 1,5 kW of refrigeration power when it's temperature is -40°C. What kind of gas would you use?
I tried with R404A, but the temperature can't reach -40°C.
Any idea?
Thank you!
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16-09-2015, 03:33 PM #2
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Re: Single stage -40 °C
first you need a compressor that can reach -40, I would suggest R-507 or R-410A.
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16-09-2015, 03:42 PM #3
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Re: Single stage -40 °C
Yes, it was the following question
What compressor should I use?
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16-09-2015, 03:44 PM #4
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Re: Single stage -40 °C
A compressor with 1.5 KW capacity at -45C evaporating temp.
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16-09-2015, 03:57 PM #5
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Re: Single stage -40 °C
Yes, but I didn't find anything with this specs. Can you suggest me something? (reciprocating or scroll)
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16-09-2015, 08:52 PM #6
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Re: Single stage -40 °C
Check Bitzer and Copeland semi hermetic two stages low temp.
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17-09-2015, 07:08 AM #7
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Re: Single stage -40 °C
CO2 machine Bitzer, Dorin..
It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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18-09-2015, 07:13 PM #8
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Re: Single stage -40 °C
I think 1.5 kW capacity at -47C evaporating temperature... and it's may be two stage semihermetic compressor on R507/404
Originally Posted by chemi-cool
In some places will have to think ...
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02-10-2015, 04:32 PM #9
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Re: Single stage -40 °C
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.
