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<p class="MsoNormal"><span style="color:#1F497D">Hi folks,<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 thought it might be worth sending this one more time as I know a lot of people in the US were on vacation last week and may have missed this exciting post!<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">Best,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Rosie<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Osser, Roselin<br>
<b>Sent:</b> Thursday, July 05, 2012 1:16 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Cogeneration with thermal tracking<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi eQuest users,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Has anyone successfully modeled a cogeneration system in eQuest with a control system preventing the generators from turning on until a certain minimum heating load threshold is reached?
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This is my first time using the generators in eQuest. I am trying to follow "Example 4. Thermal Tracking with Surplus Sale" in the DOE-2 user's manual (available by going to Help, DOE-2 Help, and searching for "Example 4" in eQuest). When
I get to the setup for the EQUIP-CTRL, the example indicates that generators can be selected along with boilers when the EQUIP-CTRL is of TYPE = HEATING with the HW loop selected as CIRCULATION-LOOP. However, only my boilers show up as options in the pull-down
menu in the tab "Load Range 1" under "Boiler Name." The generators do not appear as options here unless TYPE = ELECTRICAL is selected. This is not desired because I wish to control the generator operation based on a minimum heating load, not a minimum electrical
load. I am able to set up the rest of the components in Example 4.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I tried editing the input file to manually add the generators to the control system; I was able to run eQuest with this code:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">"Generator Control" = EQUIP-CTRL <o:p></o:p></p>
<p class="MsoNormal"> TYPE = HEATING<o:p></o:p></p>
<p class="MsoNormal"> CIRCULATION-LOOP = "Hot Water Loop"<o:p></o:p></p>
<p class="MsoNormal"> LOADS-THRU-1 = 3.75<o:p></o:p></p>
<p class="MsoNormal"> LOADS-THRU-2 = 100<o:p></o:p></p>
<p class="MsoNormal"> BOILERS-1 = ( "Boiler 1", "Boiler 2" )<o:p></o:p></p>
<p class="MsoNormal"> GENERATORS-2 = ( "Elec Gen 1", "Elec Gen 2" )<o:p></o:p></p>
<p class="MsoNormal"> ..<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">After doing more experiments, however, it looks like there might be some additional bugs with the control system algorithm. For example, if I put in a generator capacity of 1000kW, hourly outputs show that slightly less than 100kW is generated.
If I change the capacity to 10,000 kW, slightly less than 1,000 is generated. Additionally, the generator doesn’t seem to respond to the “LOADS-THRU” keyword; it comes on even if the LOADS-THRU-1 value is never reached.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In addition to these issues I’m not sure if I correctly understand how to use the GENERATOR-SEQ keywords used in Example 4; I couldn’t find a good explanation in the help file. No luck with these issues on the BLDG-SIM list either.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If anyone has any tips or knowledge that these options in eQuest are not currently operational, I would be happy to hear from you.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Rosie<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span lang="EN-GB" style="font-family:"Arial","sans-serif";color:#333399">Roselin Osser, PE, BEMP, LEED AP BD+C</span></b><o:p></o:p></p>
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