<div dir="ltr"><div dir="ltr"><div><font color="#073763">Hi Chris,</font></div><div><font color="#073763"><br></font></div><div><font color="#073763">I have checked out something over this and shall try to help you with.</font></div><div><font color="#073763"><br></font></div><div><font color="#073763">The case that you are considering which is undefined or not setting any schedule is the case where there is 24 hour working schedule considered.</font></div><div><font color="#073763"> </font></div><div><font color="#073763">The thing that eQUEST considers when there is no schedule is it would automatically will consider the case of 24 hour working.</font></div><div><font color="#073763"><br></font></div><div><font color="#073763">The case that you are inferring as with set 0 for unoccupied hours is the correct way to model the building in eQUEST rather if you would try to have undefined schedule or with not any schedule then you might land with the incorrect results as it is not the liking way to model the building in eQUEST. It would rather the undefined schedule will show 24 hour working fan which is as per proper result getting is totally wrong.</font></div><div><font color="#073763"><br></font></div><div><font color="#073763">So to mode lit correctly you are required to have the proper schedule to have a work with.</font></div><div><font color="#073763">Hope this might help.</font></div><div><font color="#073763"><br></font></div><div><font color="#073763"><br></font></div><div><font color="#073763"><b>Thanks and Regards,</b></font></div><div><font color="#073763">Sharad.Kumar</font></div><div><font color="#073763">Freelancer</font></div><div><font color="#073763">Energy Simulation and Day-lighting</font></div><div><font color="#073763">India.</font></div><div><font color="#073763"><br></font></div><div><font color="#073763">----------------------------------------------------------------------------------------------------------------------------.</font></div><div><br></div><div> 1. Difference btw no fan schedule and fan schedule set to 0<br></div><div dir="ltr">
(Chris Hadlock)<br>
<br><br><br>---------- Forwarded message ----------<br>From: Chris Hadlock <<a href="mailto:cjhadlock@gmail.com" target="_blank">cjhadlock@gmail.com</a>><br>To: <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>Cc: <br>Bcc: <br>Date: Tue, 29 Oct 2019 10:56:50 -0400<br>Subject: [Equest-users] Difference btw no fan schedule and fan schedule set to 0<br><div dir="ltr">Hell all,<div><br></div><div>I have a residential building where each suite has a PSZ (constant volume) system (hot water heating from boiler, DX cooling). I'm trying to understand the difference as far as eQuest is concerned between specifying <b>a fan schedule whose values are set to 0</b> (i.e. OFF for all hours) and <b>not specifying any fan schedule</b> (i.e. undefined). In both cases, I've set the indoor fan mode to <u>Intermittent</u> and I've set the Night Cycle control to <u>Cycle On Any</u>.</div><div><br></div><div>For the most part, it doesn't change the heating, cooling, or fan power that much (about 10%) but it does significantly change the number of hours my fans are running as well as the hourly profiles
(airflow, as well as heating and cooling load profiles). Evaluating one residential unit for comparison purposes, I've noticed that running with a zero fan schedule reduces the fan hours by about half compared to running with no assigned schedule.</div><div><br></div><div>The graph below is what I get when I don't specify any fan schedule (undefined). You will note the airflows go from very small values (less than 100 cfm) to a max of 675 cfm.</div><div><img src="cid:ii_k2byqrse0" alt="image.png" width="481" height="289"><br></div><div><br></div><div>The graph below is what I get when I specify a fan schedule whose values are set to 0. You will note the airflows range from a min of 225 cfm to 700 cfm. If you remove the hours with less than 225 cfm from the above
graph, you more or less end up with the below graph.</div><div><img src="cid:ii_k2bysovm1" alt="image.png" width="481" height="289"><br></div><div><br></div><div>Is anybody able to explain why eQuest treats these two different fan control scenarios differently...ultimately I'm trying to understand which is more accurate from a real life perspective.</div><div><br></div><div>Thanks,</div><div>Chris</div></div>
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