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<p class="MsoPlainText">Hey Brian,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">You’re absolutely right – I should have double-checked before posting. In my mind’s eye, I recalled assigning a temperature schedule to zonal exhaust inputs, but it does appear I misremembered and that isn’t a direct option.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Tricking an airside system as you’re describing into the intended behavior must be how I’ve managed this in the past. A thermostat schedule is minimally needed at the system to define the intended “trigger temperatures,” and one could
optionally also specify a fan schedule to go beyond intermittent and enforce off/on hours as might happen in the real world via tstat + relays.<o:p></o:p></p>
<p class="MsoPlainText"><o:p></o:p></p>
<p class="MsoPlainText">~Nick<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#3A7A46"><img width="722" height="9" style="width:7.5208in;height:.0937in" id="_x0000_i1026" src="cid:image002.png@01D2286D.03968C70"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#3A7A46">Nick Caton, P.E., BEMP</span></b><span style="color:#3A7A46"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Senior Energy Engineer</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Energy and Sustainability Services</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Schneider Electric</span><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">D </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">913.564.6361
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">M </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">785.410.3317
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">E </span><span style="color:#1F497D"><a href="mailto:nicholas.caton@schneider-electric.com"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">nicholas.caton@schneider-electric.com</span></a></span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">F </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">913.564.6380</span><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">15200 Santa Fe Trail Drive<br>
Suite 204<br>
Lenexa, KS 66219<br>
United States</span><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoPlainText">-----Original Message-----<br>
From: Brian Fountain [mailto:bfountain@greensim.com] <br>
Sent: Monday, October 17, 2016 9:55 AM<br>
To: Nicholas Caton <Nicholas.Caton@schneider-electric.com>; Julien MARREC <julien.marrec@gmail.com>; Darryl Kasun <darryl.kasun@gmail.com><br>
Cc: equest-users <equest-users@lists.onebuilding.org><br>
Subject: Re: [Equest-users] Modeling Reverse Acting TStat EF<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Does this mean the exhaust fan can cycle based on zone temperature? I had thought that the exhaust fan schedule was just on/off, on/off/flag and fraction. That means you have to pre-define the expected schedule rather than having the
EF respond to the hourly space timestep temperature. <o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">What we have done in the past is to model the EF as a PSZ with the fan power as the supply fan power and the "indoor fan mode" as intermittent. Cooling capacity set to a small non-zero value (as zero invokes auto-sizing). <o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> Original Message <o:p></o:p></p>
<p class="MsoPlainText">From: Nicholas Caton via Equest-users<o:p></o:p></p>
<p class="MsoPlainText">Sent: Monday, October 17, 2016 10:39 AM<o:p></o:p></p>
<p class="MsoPlainText">To: Julien MARREC; Darryl Kasun<o:p></o:p></p>
<p class="MsoPlainText">Reply To: Nicholas Caton<o:p></o:p></p>
<p class="MsoPlainText">Cc: equest-users<o:p></o:p></p>
<p class="MsoPlainText">Subject: Re: [Equest-users] Modeling Reverse Acting TStat EF<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">From: Nicholas Caton<o:p></o:p></p>
<p class="MsoPlainText">Sent: Monday, October 17, 2016 9:38 AM<o:p></o:p></p>
<p class="MsoPlainText">To: 'Julien MARREC' <<a href="mailto:julien.marrec@gmail.com"><span style="color:windowtext;text-decoration:none">julien.marrec@gmail.com</span></a>>; Darryl Kasun <<a href="mailto:darryl.kasun@gmail.com"><span style="color:windowtext;text-decoration:none">darryl.kasun@gmail.com</span></a>><o:p></o:p></p>
<p class="MsoPlainText">Subject: RE: [Equest-users] Modeling Reverse Acting TStat EF<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Yep - Julien has the right idea!<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">The other input of interest for your case is that at the same input screen, you can select the exhaust source as "infiltration," which means the associated makeup airstream = outside conditions.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">~Nick<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Nick Caton, P.E., BEMP<o:p></o:p></p>
<p class="MsoPlainText">Senior Energy Engineer<o:p></o:p></p>
<p class="MsoPlainText">Energy and Sustainability Services<o:p></o:p></p>
<p class="MsoPlainText">Schneider Electric<o:p></o:p></p>
<p class="MsoPlainText">D 913.564.6361<o:p></o:p></p>
<p class="MsoPlainText">M 785.410.3317<o:p></o:p></p>
<p class="MsoPlainText">E <a href="mailto:nicholas.caton@schneider-electric.com">
<span style="color:windowtext;text-decoration:none">nicholas.caton@schneider-electric.com</span></a><o:p></o:p></p>
<p class="MsoPlainText">F 913.564.6380<o:p></o:p></p>
<p class="MsoPlainText">15200 Santa Fe Trail Drive<o:p></o:p></p>
<p class="MsoPlainText">Suite 204<o:p></o:p></p>
<p class="MsoPlainText">Lenexa, KS 66219<o:p></o:p></p>
<p class="MsoPlainText">United States<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">-----Original Message-----<o:p></o:p></p>
<p class="MsoPlainText">From: Equest-users [<a href="mailto:equest-users-bounces@lists.onebuilding.org"><span style="color:windowtext;text-decoration:none">mailto:equest-users-bounces@lists.onebuilding.org</span></a>] On Behalf Of Julien MARREC via Equest-users<o:p></o:p></p>
<p class="MsoPlainText">Sent: Saturday, October 15, 2016 3:41 PM<o:p></o:p></p>
<p class="MsoPlainText">To: Darryl Kasun <<a href="mailto:darryl.kasun@gmail.com"><span style="color:windowtext;text-decoration:none">darryl.kasun@gmail.com</span></a>><o:p></o:p></p>
<p class="MsoPlainText">Cc: equest <<a href="mailto:equest-users@lists.onebuilding.org"><span style="color:windowtext;text-decoration:none">equest-users@lists.onebuilding.org</span></a>><o:p></o:p></p>
<p class="MsoPlainText">Subject: Re: [Equest-users] Modeling Reverse Acting TStat EF<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Zonal exhaust fan has an option to control that on a temp schedule if I recall correctly.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Open the zone, tab "outside air" then at the right you can specify a zonal exhaust fan. (All this from memory so might differ slightly)<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Cheers,<o:p></o:p></p>
<p class="MsoPlainText">Julien<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Envoyé de mon iPhone<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">> Le 15 oct. 2016 à 20:57, Darryl Kasun via Equest-users <<a href="mailto:equest-users@lists.onebuilding.org"><span style="color:windowtext;text-decoration:none">equest-users@lists.onebuilding.org</span></a>> a écrit :<o:p></o:p></p>
<p class="MsoPlainText">><o:p> </o:p></p>
<p class="MsoPlainText">> Hi eQUESTers,<o:p></o:p></p>
<p class="MsoPlainText">><o:p> </o:p></p>
<p class="MsoPlainText">> First off, you probably will not likely appreciate this and I'll preface this with saying that I'm a total bandwagon jumper but I am okay with that.<o:p></o:p></p>
<p class="MsoPlainText">><o:p> </o:p></p>
<p class="MsoPlainText">> GO JAYS!!!<o:p></o:p></p>
<p class="MsoPlainText">><o:p> </o:p></p>
<p class="MsoPlainText">> Now that that's out of the way I am trying to model a very simple system that I'm sure many of you have modeled before.<o:p></o:p></p>
<p class="MsoPlainText">><o:p> </o:p></p>
<p class="MsoPlainText">> I have a zone that has an exhaust fan in it. When the temp. reaches above 80 degF, an exhaust fan turns on and a damper opens to draw OA into the zone.<o:p></o:p></p>
<p class="MsoPlainText">><o:p> </o:p></p>
<p class="MsoPlainText">> I've been fooling around with a few systems trying to figure out a good way to model this but haven't come up with one yet.<o:p></o:p></p>
<p class="MsoPlainText">><o:p> </o:p></p>
<p class="MsoPlainText">> Let me know if have any recommendations.<o:p></o:p></p>
<p class="MsoPlainText">><o:p> </o:p></p>
<p class="MsoPlainText">> Thanks!<o:p></o:p></p>
<p class="MsoPlainText">> Darryl<o:p></o:p></p>
<p class="MsoPlainText">><o:p> </o:p></p>
<p class="MsoPlainText">> _______________________________________________<o:p></o:p></p>
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