Pneumatic Air Conditioner Vacuum Pump

[midcarolina]

Re: Pneumatic Air Conditioner Vacuum Pump

I realize this thread is a few weeks old........ but just to clarify some misinformation..so as not to mislead others in the future,

refrigeration compressors are NOT rated by cfm.... they are rated by horse power

Using a 134 compressor in a r-12 system has nothing to do with capacity... is has to do with incompatible oils for each refrigerant.

Pulling a vacuum has to do with removing non condensables this includes moisture.

And refrigeration equipment is more efficient due to advancements in manufacturing process's (improved heat transfer ) despite being forced to use modern less efficient refrigerants...

 

[bigdee]

Re: Pneumatic Air Conditioner Vacuum Pump

I realize this thread is a few weeks old........ but just to clarify some misinformation..so as not to mislead others in the future,

refrigeration compressors are NOT rated by cfm.... they are rated by horse power

Using a 134 compressor in a r-12 system has nothing to do with capacity... is has to do with incompatible oils for each refrigerant.

Pulling a vacuum has to do with removing non condensables this includes moisture.

And refrigeration equipment is more efficient due to advancements in manufacturing process's (improved heat transfer ) despite being forced to use modern less efficient refrigerants...

?,?,? & ?

 

[midcarolina]

Re: Pneumatic Air Conditioner Vacuum Pump

What's the question marks for? did I not word my post in an easy to read format?

 

[bigdee]

Re: Pneumatic Air Conditioner Vacuum Pump

What's the question marks for? did I not word my post in an easy to read format?

refrigeration compressors are NOT rated by cfm.... they are rated by horse power

1. They can be rated by several engineering formulas including CFM

Using a 134 compressor in a r-12 system has nothing to do with capacity... is has to do with incompatible oils for each refrigerant.

2. R134 requires PAG oil instead of mineral oil. However the pressures are different and the evaporator delta T is greater (colder air output) with R12

Pulling a vacuum has to do with removing non condensables this includes moisture.

3. Correct, I misread it first time...The purpose of ?pulling a vacuum? is to lower the boiling temperature of water so moisture will boil away.

And refrigeration equipment is more efficient due to advancements in manufacturing process's (improved heat transfer ) despite being forced to use modern less efficient refrigerants...

4. I agree on this one from the standpoint of energy usage...not performance. Newer systems run with a lower delta T

 

[midcarolina]

Re: Pneumatic Air Conditioner Vacuum Pump

#1....No refrigeration compressors are always rated by HP or BTU for high temp compressors.........
complete systems can be rated by CFM....... air moving equipment is rated by CFM ie fans, shop air compressors.

#2 you are correct.... but the compressors are no different... just the anscillary devices and oil.

#3 and #4 you are correct and did a fine job of explaining into more detail than I did............

 

[dolluper]

Re: Pneumatic Air Conditioner Vacuum Pump

Remember boys all your doing is evacuating the system......so pulling strength calculated in whatever will determine time to evac system

 

[hrdwrkingacguy]

Re: Pneumatic Air Conditioner Vacuum Pump

I guess saying rated was misleading. Tonnage is derived from mass flow rate and mass flow rate is CFM. Hence the statement that compressors are vapor pumps and you measure the rate you pump a vapor in cfm...I realize the can says 5ton 5hp or 60000 btu or whatever but there is more going on.