Results 1 to 31 of 31
Threaded View
-
17-03-2003, 04:45 PM #1
R507 in an R134a compressor: any danger?
Hi again,
I have the possibility to obtain some R507, and a second hand Danfoss NL11F to do some experimenting. If I blow it, so be it.
Now, here is my theory: I can use R507 in a R134a compressor under the following conditions:
- The oil must be compatible with R507
- Low side and high side pressures must be within the original limits
- Discharge temperature must be low enough.
The oil should be compatible since the same oil is used by Danfoss for R404/R507 and R134a.
Allowable low side pressure for the NL11F is 0.84 bar to 2 bar (-30 °C evaporation .. -10 °C evaporation with R134a)
When these pressures are translated to R507 evaporation temperatures, it shows that the evaporation temperature should be within the -50 °C .. -30 °C range. In my application, this requirement is easy to fullfill.
High side pressure is a tougher story since the saturated condensing temperature must stay below 31 °C to fullfill the requirement. Tough, but a liquid-cooled condenser should be able to fullfill this requirement.
Since the compression ratio stays approximately the same and the vapour heat capacity of R134a and R507 does not differ significantly, I do not expect problems with very high discharge temperatures.
Thus, as far as I know there are no technical reasons why it should not work, but am I correct?
And what about safety? I expect no troubles with safety, but I am not 100% sure.
Similar Threads
-
Pressure Transmitter R134a Setpoints
By cooltrain in forum Technical SpeculationsReplies: 0Last Post: 28-02-2005, 09:05 AM -
Is there anything about R134a that is better than R12?
By dude in forum RefrigerantsReplies: 5Last Post: 01-03-2004, 09:59 PM -
R507 in an R134a compressor: system design
By DaBit in forum Technical SpeculationsReplies: 17Last Post: 01-05-2003, 09:25 AM -
Minimal required R134a speed in suction line
By DaBit in forum CPU OverclockersReplies: 32Last Post: 08-05-2002, 05:19 AM -
Effect on design evaporator by using R507 instead of R22
By lappee in forum RefrigerantsReplies: 2Last Post: 18-09-2001, 05:15 PM