[SBE] A/C 3phase vs single phase

[Edwin Bukont]

Chris is correct.

 

As for the cost of installing 3-phase, you need to kick it up a few levels at the local power company.  The mgt of utilities want you to use 3-phase, preferrably at 480.  You might find them cooperative, and you may inquire about any funding incentives for converting to more efficient utilities.  If you do bring in new 3-phase, do it at 480, and begin transitioning your new items such as HVAC and transmitters.  

Edwin Bukont CSRE, DRB, CBNT 
V- 240.417.2475; F- 240.368.1265 

 




 


From: crmurray at clearwire.net
To: sbe at sbe.org
Date: Thu, 11 Jun 2009 06:41:13 -0700
Subject: Re: [SBE] A/C 3phase vs single phase







Three phases is more efficient. The power factor is better as the voltage across the magnetic windings never get to zero a crossover point. I’ve seen differences of the factor being .8 for single and .95 for three phases. 
 




From: sbe-bounces at sbe.org [mailto:sbe-bounces at sbe.org] On Behalf Of Chris Hoopes
Sent: Thursday, June 11, 2009 6:20 AM
To: sbe at sbe.org
Subject: [SBE] A/C 3phase vs single phase
 




It comes up every now and then that I am called upon to scope out new air conditioning systems. I always figured with both available, that 3 phase was more efficient. Less current is required to start a 3 phase motor. Smaller gauge wires, but more of them. But then the other day I was called down on this. I wondered if advancement in A/C technology had changed the fact. The way 3 phase is measured is a difficult concept, peak demand. What has been your experience? Is 3 phase cheaper to operate and cool with then a 2 phase system? Or is there no difference?
 
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