So, I'm a freshly converted DOE2 user with no one else in the firm with E+ experience, so please bear with me here, but I can't figure out what's going on in this model. I have an exteme number of unmet load hours (mostly heating hours) and my heating is significantly higher during the winter time than the actual bills. So I went to dig into outdoor air and fans at night, and looking at the hourly reports, they're both running 24/7 during the winter time (not good in central Iowa).
I've done everything I can think of to set the outdoor air damper to a minimum of 15% during the daytime and closed at night. But they only both shut off during the summer periods.
I've set the schedules for "Minimum Outdoor Air Schedule Name", "Minimum Fraction of Outdoor Air Schedule Name" (what is the difference between the two, except that the latter overrides other settings?), and the hard coded outdoor air flow minimum to 0 (just to check it's effect). I do have the option set to cycle on the system if any zones need conditioning (which many do because they're overcooling), and if I change that to follow the schedule it does drive both the damper closed at night and the fans off at night. But that only seems to make my zone temperature issues worse.
I know in DOE2 there was generally some parent setting the overwrote the children I was modifying, but I can't figure out what's driving the ship here.
So, what I don't understand is how do I drive the outdoor air damper closed at night while still allowing the fan to cycle on to meet the space load? That may not address my unmet load hour issue, but I'm hoping it's a step in the right direction.
Here's a link to a weather file you can use that should replicate these issues.
And here's a link to the OSM file.
Any thoughts or tips would be appreciated.
