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<p class="MsoNormal">When you say loads, do you mean the end-use energy breakdown totals? (Loads = heat/cooling gains in the spaces – VFDs should not be affecting heating or cooling loads.)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If the change to the tower fan motors allows a different control of the condenser water temperature to be colder water then the compressor energy of the individual heat pumps would go down.<o:p></o:p></p>
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<p class="MsoNormal">David<o:p></o:p></p>
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<p class="MsoNormal"><b><span style="color:#1F497D">David S. Eldridge, Jr.</span></b><b><span style="color:#244061">, P</span></b><b><span style="color:#1F497D">.</span></b><b><span style="color:#244061">E</span></b><b><span style="color:#1F497D">.</span></b><b><span style="color:#244061">,
BEMP, BEAP, HBDP, GGA</span></b><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Associate</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:4.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#365F91">Direct: (847) 316-92</span><span style="color:#1F497D">24</span><span style="color:#365F91"> | Mobile: (</span><span style="color:#1F497D">773</span><span style="color:#365F91">)
</span><span style="color:#1F497D">490</span><span style="color:#365F91">-</span><span style="color:#1F497D">5038</span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="color:#244061">Grumman/Butkus Associates</span></b><span style="color:gray">
</span><span style="color:#365F91">| 820 Davis Street, Suite 300 | Evanston, IL 60201</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;color:gray">Energy Efficiency Consultants and Sustainable Design Engineers</span><o:p></o:p></p>
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<p class="MsoNormal"><u><span style="font-size:9.0pt;color:gray"><a href="http://grummanbutkus.com/"><span style="color:gray">grummanbutkus.com</span></a></span></u><span style="font-size:9.0pt;color:gray"> |
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<p class="MsoNormal"><b>From:</b> Equest-users <equest-users-bounces@lists.onebuilding.org>
<b>On Behalf Of </b>Dilshad Ahmed Khan via Equest-users<br>
<b>Sent:</b> Monday, May 11, 2020 3:00 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Impact of Cooling Tower EEM on Space Cooling load<o:p></o:p></p>
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<p class="MsoNormal">Hello everyone!<o:p></o:p></p>
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<p class="MsoNormal">I have modeled water cooled packaged DX systems that are connected to a cooling tower having a single-speed fan and pump. When I change the single-speed fan and pump with variable speed drives as an EEM, the results show a reduction in
"Pumps & Aux." load as well as "Space Cooling" load. In fact, sometimes the reduction in space cooling load seems to be greater than "Pumps & Aux." load itself. Can anybody decipher what is the relation of VSDs pump and fan of cooling tower with space cooling
load?<o:p></o:p></p>
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<p class="MsoNormal">Thanks<o:p></o:p></p>
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