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<p class=MsoNormal>Folks,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I am trying to understand modeling the DHW system in eQuest.
I searched through the list archives for posts. I found some information but
still am not clear.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Our project has the following:<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>3 heaters per DHW loop and 1 DHW loop per building for
FOUR buildings.<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Total occupants = 1526 and shower load is the major
load (lavatories are negligible) <o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>We use a 1.2 gpm shower head. <o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>We estimate a 12 min shower per day per occupant as the
load and the load does <b>not</b> vary through the year. <o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>5.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Hot water supply temperature is 105 F<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>6.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Our storage gas water heaters are 92% efficient.<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>7.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Our potable water comes from a reservoir and so I built
a DHW inlet water temperature schedule that reflects the changes per month<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>We also have a solar thermal system that using RETSCREEN we
figured out that it saves about 60% of the total hot water consumption.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Modeling attempt 1:<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>I used one single loop and one heater for the entire
campus.<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>On the below screen shot for the DHW loop what is the Process
Flow in gpm?<o:p></o:p></p>
<p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>a.<span
style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Do
I calculate it as below?<o:p></o:p></p>
<p class=MsoListParagraph style='margin-left:1.5in;text-indent:-1.5in;
mso-text-indent-alt:-9.0pt;mso-list:l0 level3 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'><span style='font:7.0pt "Times New Roman"'>
</span>i.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Process flow = (1526 occupants x 1.2 gpm x 12 min per
day) / (24 hours x 60 mins) = 15.26 gpm<o:p></o:p></p>
<p class=MsoListParagraph style='margin-left:1.5in;text-indent:-1.5in;
mso-text-indent-alt:-9.0pt;mso-list:l0 level3 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'><span style='font:7.0pt "Times New Roman"'>
</span>ii.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>And then assign a DHW_schedule that has 1.0 as the
multiplier for all the hours in the year<o:p></o:p></p>
<p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>b.<span
style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Or
do I calculate it as below?<o:p></o:p></p>
<p class=MsoListParagraph style='margin-left:1.5in;text-indent:-1.5in;
mso-text-indent-alt:-9.0pt;mso-list:l0 level3 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'><span style='font:7.0pt "Times New Roman"'>
</span>i.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Process flow = 1526 occupants x 1.2 gpm x 12 min per
day / 60 mins per hour = 366.24 gpm<o:p></o:p></p>
<p class=MsoListParagraph style='margin-left:1.5in;text-indent:-1.5in;
mso-text-indent-alt:-9.0pt;mso-list:l0 level3 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'><span style='font:7.0pt "Times New Roman"'>
</span>ii.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>And then assign a DHW_schedule that has basically “0”
as the multiplier for all the hours except “0.5” for 6 am to 7 am
and “0.5” for 5 pm to 6 pm – this way I am allowing half of
the occupants to take shower in the morning and the other half in the evening
and the rest of the hours there is no demand – this close to reality!<o:p></o:p></p>
<p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>c.<span
style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Or
do I count all the shower heads I have and figure out the total gpm of the heads?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Screenshots of the inputs on the Loop:<o:p></o:p></p>
<p class=MsoNormal><img width=732 height=541 id="Picture_x0020_2"
src="cid:image001.png@01CAAE4B.E780F950"><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><img width=732 height=541 id="Picture_x0020_3"
src="cid:image002.png@01CAAE4B.E780F950"><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Problems:<o:p></o:p></p>
<p class=MsoNormal>If I input the process flow as 15.26 gpm, eQuest is
calculating the total DHW energy consumption as 5,315 Million BTU but our hand
calcs only shows 2,298 Million BTUs.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>So if any of you have any suggestions on getting the DHW load
correct, I would really appreciate that.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Also on the Solar Side, what is the best way to simulate
this?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Again many thanks.<o:p></o:p></p>
<p class=MsoNormal>Prem<o:p></o:p></p>
<p class=MsoListParagraph><o:p> </o:p></p>
<p class=MsoListParagraph><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Arial","sans-serif";
color:black'>Premnath Sundharam, Assoc. AIA, LEED AP</span></b><span
style='font-size:12.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Architectural Designer | Senior Associate<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:9.0pt;
font-family:"Arial","sans-serif";color:#4D4D4D'>psundharam@dlrgroup.com<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><b><span style='font-family:"Arial","sans-serif";color:black'>DLR
Group</span></b><span style='font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:black'>Architecture Engineering Planning Interiors<o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:#4D4D4D'>o: 602/381-8580<br>
6225 North 24th Street, Suite 250 Phoenix, AZ 85016-2020<br>
<a href="http://www.dlrgroup.com/"><span style='color:#4D4D4D'>dlrgroup.com</span></a>
| listen.DESIGN.deliver<br>
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