I looked around and found a few threads with people experiencing a similar issue as I'm experiencing right now, however, it sounds like their issues may have involved using custom efficiency curves (which I am not). The issue is - I'm getting negative cooling energy, particularly during the shoulder economizer months. I either need help identifying this novel energy source so I can patent it and become filthy rich, or figure out how I broke DOE2...
If it helps, the effect is exaggerated when I change the economizer lockout from 65F to something lower like 45F (this is where I took the above screenshot).
Has anyone seen this before or found a resolution? I'm guessing (well, hoping) that it's something trivial that I am overlooking, but a weekend away from the model hasn't helped...
I'm attaching the project files. Any thoughts would be appreciated!
Eric O'Neill
Eric,
I found at least one problem - you are using a HW reset temperature control on your CHW loop. (Check the week and day schedules on "ChW Reset".) I changed it to an ASHRAE CHW reset schedule and got this:
[cid:image001.jpg at 01CD8462.F2704D80]
Regards,
Bill
[Senior Energy Engineer 28Jun2012]
Ah, that looks like it was the (most substantial) issue. Interesting that my unmet load hours we're worse off with that setting :) Thanks Bill!
Eric