High unmet cooling hours for finished basements served by central cooling systems
Using ResStock v2.2.4 with OpenStudio v.2.9.0 and EnergyPlus v9.2
I've found that homes modeled with a central cooling system, versus room-by-room, always results in a high amount of unmet cooling hours for the finished basement zone. I don't understand why that seems to be the case, especially considering the location I'm modeling in is in Northern Michigan.
The following is my results.csv that shows the number of unmet cooling hours for homes with a heated basement, with a centralized AC unit.
The following is the same results.csv, but instead, showcasing buildings modeled with a room-by-room AC unit. Notice how the number of unmet cooling hours are much more reasonable.
The following is a screenshot for one particular building's unmet hours by zone: notice the condition of the finished basement zone.
Here is the HVAC Load profile for the same building:
The above is similar for all buildings with a finished basement. In a location like Northern Michigan, I really don't understand why this seems to be the case. Is there any way to fix this via PAT tool, or the options_lookup.tsv? Is this just a by-product of centralized cooling, where the finished basement will over heat? Why is that so? The same thing will happen if I modeled with an ASHP, or any centralized cooling equipment for that matter.
