Also, the pumping energy for the cooling tower ends up in Pumps and Auxiliary. This number usually constitutes much of the energy used by the cooling towers.<div><br></div><div>--</div><div>Karen<br><br><div class="gmail_quote">
On Wed, Jul 21, 2010 at 10:59 AM, James Hansen <span dir="ltr"><<a href="mailto:JHANSEN@ghtltd.com">JHANSEN@ghtltd.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div lang="EN-US" link="blue" vlink="purple">
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Cooling towers are just fans, so it’s no surprise that their
percentage relative to the total consumption is small. Make sure your cell KW
or total fan EIR is accurate.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">And as for your question on reset: I usually just specify the condenser
water loop control strategy to be LOAD RESET, with a minimum reset temperature
of 70 degrees. </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<div>
<p class="MsoNormal"><b><span style="font-size:11.0pt;color:teal">GHT Limited<br>
</span></b><b><span style="font-size:11.0pt"><span style="color:black">James Hansen</span></span></b><b><span style="font-size:11.0pt;color:black">, PE,
LEED AP</span></b></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;color:black">Senior Associate</span></b><b><span style="font-size:11.0pt;color:black"></span></b></p>
<p class="MsoNormal"><span style="font-size:7.5pt"><span style="color:black">1010 N. Glebe Rd, Suite 200</span></span><span style="font-size:11.0pt;color:#1F497D"></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt"><span style="color:black">Arlington</span><span style="color:black">, </span><span style="color:black">VA</span><span style="color:black"> </span><span style="color:black">22201-4749</span></span><span style="font-size:11.0pt;color:black"></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;color:black">703-338-5754 (Cell)</span><span style="font-size:11.0pt;color:black"></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;color:teal"><a href="http://www.ghtltd.com/" target="_blank"><span style="font-size:10.0pt">www.ghtltd.com</span></a></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;color:#31849B"> </span></b></p>
</div>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10.0pt">From:</span></b><span style="font-size:10.0pt"> <a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>
[mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Omar
Katanani<br>
<b>Sent:</b> Wednesday, July 21, 2010 9:55 AM<br>
<b>To:</b> Omar Katanani; <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] Heat Rejection consumption is so small!!</span></p>
</div>
</div><div><div></div><div class="h5">
<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
<p style="margin-bottom:12.0pt"><span style="font-size:10.0pt">Dear all,<br>
<br>
Can anyone please answer my question that I sent last week? Your continuous
support is much appreciated!<br>
In addition to that, I have this small question below:<br>
<br>
Section G3.1.3.11 of ASHRAE 90.1 - 2007 says:<br>
<br>
"Condenser water design supply temperature shall be 85°F or 10°F
approaching design wet-bulb temperature, whichever is lower, with a design
temperature rise of 10°F. The tower shall be controlled to maintain a 70°F
leaving water temperature where weather permits, floating up to leaving water
temperature at design conditions."<br>
<br>
I was able to put the design set point temperature and the loop design DT
of the Condenser water loop to 85F and 10F respectively.<br>
<br>
What about the tower? Where can I input this leaving temperature range from 70F
up to the leaving water temperature?<br>
<br>
<br>
Many thanks!<br>
Omar<br>
___________________________<br>
<br>
Omar Katanani<br>
Sustainable Design Engineer<br>
Email: <a href="mailto:omar@ecoconsulting.net" target="_blank">omar@ecoconsulting.net</a><br>
<br>
<br>
EcoConsulting (Lebanon)<br>
Nahas Building, 4th floor<br>
4 St-Maron Street / Georges Haddad Avenue<br>
Postal Code: 2028 5806 SAIFI<br>
Beirut, Lebanon<br>
Tel: +961 (0) 1 971 255<br>
Mobile: +961 (0) 3 045 045<br>
<br>
<br>
EcoConsulting (UK) Ltd<br>
28 Marshalsea Road<br>
London, SE1 1HF<br>
Tel: +44 (0)207 939 0989<br>
Fax: +44 (0)207 939 0981<br>
Website: <a href="http://www.ecoconsulting.net" target="_blank">www.ecoconsulting.net</a><br>
<br>
<br>
<br>
-----Original Message-----<br>
From: Omar Katanani<br>
Sent: Thu 7/15/2010 1:54 PM<br>
To: <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
Subject: Heat Rejection consumption is so small!!<br>
<br>
<br>
<br>
Dear all,<br>
<br>
<br>
<br>
What are typical values for heat rejection, if my Space Cooling constitutes 25%
of my school consumption? All I'm getting is 1% or so!<br>
<br>
<br>
<br>
I left eQUEST to autosize the capacity of the tower, and I entered many default
values into the inputs of the Open Tower and the Condenser Loop. I've heard
that Heat Rejection in such climates such as Lebanon should reach at least 10%.<br>
<br>
<br>
<br>
One more thing, when modeling the baseline case according to ASHRAE 90.1, I
read that I should model a condenser water loop for each chiller. So if I have
2 chillers, will I need 2 Open Towers?<br>
<br>
<br>
<br>
Many thanks,<br>
<br>
Omar<br>
<br>
___________________________<br>
<br>
Omar Katanani<br>
Sustainable Design Engineer<br>
<br>
Email: <a href="mailto:omar@ecoconsulting.net" target="_blank">omar@ecoconsulting.net</a><br>
<br>
<br>
<br>
EcoConsulting (Lebanon)<br>
<br>
Nahas Building, 4th floor<br>
<br>
4 St-Maron Street / Georges Haddad Avenue<br>
<br>
Postal Code: 2028 5806 SAIFI<br>
<br>
Beirut, Lebanon<br>
<br>
Tel: +961 (0) 1 971 255<br>
Mobile: +961 (0) 3 045 045<br>
<br>
<br>
<br>
EcoConsulting (UK) Ltd<br>
28 Marshalsea Road<br>
London, SE1 1HF<br>
Tel: +44 (0) 207 939 0989<br>
Fax: +44 (0) 207 939 0981<br>
<br>
Website: <a href="http://www.ecoconsulting.net" target="_blank">www.ecoconsulting.net</a> <<a href="http://www.ecoconsulting.net/" target="_blank">http://www.ecoconsulting.net/</a>><br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
</span></p>
</div></div></div>
</div>
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