<div>Hi Omar,</div>
<div> </div>
<div>here are my thoughts based on your questions and info.</div>
<div> </div>
<div>First, when I read the condenser/heat rejection baseline requirements from 90.1-2007 I interpret that it is not indicating two separate condenser loops, it is stating "individual condenser loop pumps per chiller", there for you would still have one condenser circulation loop serving both chillers and one cooling tower.</div>
<div> </div>
<div>Next, if you have heard from designers with experience in the Lebanon climate characteristics that your heat rejection energy should be upwards of 10% then you could/should trust thier given experience. However; you need to ask them what is this 10% relative too? Are they implying that 10% of the whole building end use energy should be around 10% for the Lebanon climate? (my opinion: I doubt it.) Are they implying that 10% of the Chilled Water System end use energy (i.e. CHW-chiller, CHW-pumps, CHW-condenser water systems including pumps & tower, etc?) (my opinion: I would guess that this 10% value is relative to HVAC system(s) end use energy, not <u>whole building</u> end use energy. Or is that 10% relative only to the chilled water-side of the systems (extracted from the total HVAC energy which would include heating energy.)</div>
<div> </div>
<div>Last, if you would like to attach your .pd2 & .inp file myself, or maybe others might be available to peruse your project file and give you some indication if your end use heat rejection energy is falling within a reasonable whole building energy range.</div>
<div> </div>
<div>p.s. if you are using a unique (non-eQuest) Lebanon climate weather file, please attach that too so that I can run your file on my computer.</div>
<div> </div>
<div>pkg<br><br></div>
<div class="gmail_quote">On Thu, Jul 15, 2010 at 4:54 AM, Omar Katanani <span dir="ltr"><<a href="mailto:omar@ecoconsulting.net">omar@ecoconsulting.net</a>></span> wrote:<br>
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<p class="MsoNormal"><font color="#333399" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: #333399; FONT-SIZE: 10pt"> </span></font></p>
<p><font color="#333399" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: #333399; FONT-SIZE: 10pt">Dear all,</span></font></p>
<p><font color="#333399" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: #333399; FONT-SIZE: 10pt"> </span></font></p>
<p><font color="#333399" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: #333399; FONT-SIZE: 10pt">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!</span></font></p>
<p><font color="#333399" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: #333399; FONT-SIZE: 10pt"> </span></font></p>
<p><font color="#333399" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: #333399; FONT-SIZE: 10pt">I left eQUEST to autosize the capacity of the tower, and I entered many default values into the inputs of the </span></font><font color="#333399" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: #333399">Open</span></font><font color="#333399" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: #333399"> </span></font><font color="#333399" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: #333399">Tower</span></font><font color="#333399" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: #333399"> and the Condenser Loop. I’ve heard that Heat Rejection in such climates such as </span></font><font color="#333399" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: #333399">Lebanon</span></font><font color="#333399" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: #333399"> should reach at least 10%.</span></font></p>
<p><font color="#333399" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: #333399; FONT-SIZE: 10pt"> </span></font></p>
<p><font color="#333399" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: #333399; FONT-SIZE: 10pt">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 </span></font><font color="#333399" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: #333399">Open</span></font><font color="#333399" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: #333399"> </span></font><font color="#333399" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: #333399">Towers</span></font><font color="#333399" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: #333399">?</span></font></p>
<p><font color="#333399" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: #333399; FONT-SIZE: 10pt"> </span></font></p>
<p><font color="#333399" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: #333399; FONT-SIZE: 10pt">Many thanks,</span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Omar</span></font></p>
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<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">Omar Katanani<br>Sustainable Design Engineer</span></font></p>
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