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<p class="MsoNormal"><span style="color:#1F497D">Im still having problems with this model. I think most of the problems are that I ran my loads in Trane Trace and am running the model in eQuest. Another problem I think I’m having is that the design case system
is a single zone packaged rooftop unit with natural gas reheat at the RTU level. I’ve got the zones modeled and grouped according to orientation and occupancy to try to alleviate some of the problems but I still have around 1400 unmet hours.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Here is a list of some things I have done to fix unmet hours so far:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Deleted % of OA at PSZ since the supply air that I input at the RTU level was not what eQuest was using<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Moved the total PSZ OA to the zone level, I put all the outside air in to the control zone.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Set the heat and cooling schedules on all zones that weren’t a room with a thermostat to undefined – so those rooms didn’t add to unmet hours.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">4.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Set Throttling range to 6<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">5.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Set thermostat type to reverse action on all zones.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">6.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Checked schedules to make sure they are coordinated with other schedules.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">7.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">I stepped down the temperature when the unit first starts up in the morning to step down the space temp 2 degrees an hour to help reduce unmet hours at morning startup.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I’ve attached the baseline and design case files. I also attached some of the simulation reports.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I’m having trouble modeling the gas domestic tankless water heater and a 9 kw electric tankless water heater. My gas usage seems real high.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal">Thanks in advance for your help!!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Verdana","sans-serif";color:#404040">Jamie Armstrong
</span></b><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#404040">P.E.</span><b><span style="font-size:12.0pt;font-family:"Verdana","sans-serif";color:#404040"><br>
</span></b><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#404040">Mechanical Engineer<br>
<br>
<img width="264" height="53" id="Picture_x0020_1" src="cid:image002.jpg@01CD3DBD.55C74B50" alt="Description: Description: image001"><br>
<br>
v. 210.546.0200 | <a href="http://www.dbrinc.com">www.dbrinc.com</a></span><span style="color:#404040"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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