I wonder if this isn't all a throw-back to the days of water-cooled
behemoths that had large motors to circulate the water to cool the
CPUs. IBM may be trying to let customers use the power circuits they
installed decades ago for their first 303x , 308x, or 309x.
On May 4, 2009, at 7:56 AM, Dave Jones wrote:
Well, the z boxes all have motors to drive the fans, but I do not
understand why they would need 3 phase power......but, as Alan
mentions, I'm not an engineer.
Alan Ackerman wrote:
On Fri, 1 May 2009 13:09:38 -0400, Rich Greenberg
<ric...@panix.com> wrote:
On: Fri, May 01, 2009 at 11:53:04AM -0500,Brian Nielsen Wrote:
} In any case, cost per kwh is not relevant since the site is
charging a
} flat fee for the installed circuit, not for the amount of power
drawn
} through the circuit.
What I remember is that 3-phase current is more efficient for
running motors. (I used to know why, but not any more.) I think
that's why my house has 3-phase in the basement to run the washer
and dryer. I never heard any reason why it would be better for
running a computer. (Does a z890 include a motor?)
But what do I know? I am a programmer, not an engineer. So are most
of us on this list. I'd suggest you might want to ask your question
somewhere that electrical engineers hang out. But if there isn't
any difference in your cost, why do you care? Unless, as Rich
suggested, 3-phase is more reliable. Alan Ackerman
Alan (dot) Ackerman (at) Bank of America (dot) com
--
Dave Jones
V/Soft
www.vsoft-software.com
Houston, TX
281.578.7544
