[SBE] A/C 3phase vs single phase

[Chris Murray]

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. 

 

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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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