Quote:
Originally Posted by jeff5may
From what I know about compressors (not much), the R410 types are set up for a higher compression ratio and higher ultimate pressures (r22 or 290 high side runs in the 200's psi range, r410a runs in the 400's psi range). I have heard that you can run them at lower pressures, though.
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Mostly right. Compression ratios remain the same, it's just the low and high side pressures are higher in an absolute sense. The other thing about 410A vs 22 or 290 is it has quite a high latent heat capacity so you need less mass flow for the same refrigerating capacity.
This means 410 compressors have a smaller displacement than their R22 counterparts, so a 18KW compressor for 410A will provide a significantly reduced capacity with a lower pressure refrigerant.
I can dig up the figures and give you a calc if you are really interested (or you could run a quick simulation in coolpack with a fixed mass flow compressor and see the difference in Qc when you switch refrigerants)