<div dir="ltr"><div>The default on <span>vfd</span> is 40%. I see savings compared to every other option - one-speed, discharge damper etc. None of them use the fan-speed vs power fan curve except two-speed and <span>vfd</span> options. So, basically both are working in the same way with a penalty of <span>vfd</span> losses in the <span>vfd</span> case? I would think that the two-speed option will not need a curve.</div>
<div>Thanks, </div><div>-<span>Rohini</span></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Jun 4, 2013 at 8:37 AM, RobertWichert <span dir="ltr"><<a href="mailto:robert@wichert.org" target="_blank">robert@wichert.org</a>></span> wrote:<br>
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    <div>I recall having to pick the "minimum
      speed ratio" box or something like that before the VFD would show
      savings.<br>
      <br>
      Have you set that?<br>
      <br>
      <br>
      <pre cols="72">Robert Wichert P.Eng. LEED AP BD&C
<a href="tel:%2B1%20916%20966%209060" target="_blank" value="+19169669060">+1 916 966 9060</a>
FAX <a href="tel:%2B1%20916%20966%209068" target="_blank" value="+19169669068">+1 916 966 9068</a>







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      On 6/3/2013 7:22 PM, R B wrote:<br>
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        <div>Hi all, </div>
        <div>Has anyone tried to see the savings associated with
          upgrading two-speed fan to <span>VFD</span> in a cooling
          tower? I see increased energy use due to the <span>vfd</span>.
          on further digging, it looks to me that both two-speed and <span>vfd</span>
          fans use the same fan performance curve. Is this the case or
          am I missing something?</div>
        <div>Thanks in advance,</div>
        <div>-<span>Rohini</span></div>
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