Homemade silent air compressor

[justinsane]

Just to elaborate r134a (like its predecessor r12) is a lower pressure refrigerant, meaning that both the high side and low side operate at lower pressures than say r22 for the older school or modern r407c or 404a.


134a compressor will see 68 psi at 20°C or 68°F whereas 407c is 113 psi and 404a is 143 psi so if we were to assume that they are all expected to runt he same high side temperature that would mean the 407c and 404a units would expect a substantially higher pressure. When I work on 134a refrigerated dryers the high pressure shutdown is typically lower than the fan cycling switch for the 407c/404a units. In other words the 134a unit is shutting down on high pressure at a lower pressure than the 407c/404a unit is even turning on the condenser fan.
Again what you gain in pressure you will loose in CFM but in an intermittent use scenario storing the air might be a better solution than making it as needed "realtime".
By that I mean that the compressor can run, make/store the air and shut down while you don't need it and when you do need it, it is there.
If you use the lower pressure unit you will be quickly limited to the amount of air that the compressor can make which in all of these cases is not very much.