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Cooling tower - Two-speed vs VFD fan, bug?

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Hi all,
Has anyone tried to see the savings associated with upgrading two-speed fan
to VFD in a cooling tower? I see increased energy use due to the vfd. on
further digging, it looks to me that both two-speed and vfd fans use the
same fan performance curve. Is this the case or am I missing something?
Thanks in advance,
-Rohini

Jun 3, 2013
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