<div dir="ltr"><div>Pramod, see the discussion <a href="https://unmethours.com/question/13807/why-does-a-constant-speed-pump-to-variable-speed-pump-result-in-electrical-energy-savings-and-an-equivalent-heating-energy-increase/#13825">here</a>. This was regarding Energy Plus and a HHW loop, but the reason for the heating increase is the same.<br><br></div>Aaron<br><div><div><br><br>From: "Pramod .D via Equest-users" <<a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a>><br>To: "<a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a>" <<a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a>><br>Cc: <br>Date: Thu, 28 Apr 2016 09:20:58 +0000<br>Subject: [Equest-users] VFD vs constant pump<br>
<p class="MsoNormal">Hi All,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I am simulating a model to see the savings provided
by VFD pump connected to the DHW plant loop. The energy used by the VFD
pump is less compared to constant volume pump. The problem is the
energy usage of DHW increases if constant volume
pump is changed to VFD. Is this correct or am I missing anything? How
does VFD pumps increases DHW usage?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Thanks!</p>
Pramod</div></div></div>