Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
These are not necessarily problems that need to be fixed, but...
For # 1, some zones just have no heating load. You can add some infiltration or a fake cooling load during the winter design day to get a non-zero design heating load.
For #2, you could increase the resulting design air flow rate by raising the value for Zone Cooling Design Supply Air Temperature from 12.5C to something higher, say 14.0 C. Then you won't trip the minimum limit on the Flow/Capacity ratio. The idea is that DX coil models have a range of flow/capacity that is valid and when autosizing the range is enforced, so there needs to be an appropriate balance between air flow rate and cooling capacity.
