You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert
Work on changing the order of the internal surface data (#7575) has tripped over some surprising diffs. For example, here's the cooling coil load and chiller load for the summer design day in 5ZoneWaterCooled_Baseboard, with develop and with ManageSurfaceHeatBal2. Similar behavior has been observed in 5ZoneCoolingPanelBaseboardAuto (both files have baseboard with a radiant fraction, but I'm not sure that's relevant) or maybe it is. The cooling coil loads a differ some, but the chiller load shows big diversions at night when the load is smaller.
On a wild guess (or goose chase), I tried increasing the minimum plant iterations to 10 (from the default of 2).
ConvergenceLimits,
1, !- Minimum System Timestep {minutes}
20, !- Maximum HVAC Iterations
10, !- Minimum Plant Iterations
20; !- Maximum Plant Iterations
This alters the chiller load significantly in both branches.
Looking at just develop with the change in ConvergenceLimits:
Details
Some additional details for this issue (if relevant):
mjwitte
changed the title
More plant iterations?
Convergence problem with Controller:WaterCoil and TemperatureAndHumidity control - need more plant iterations?
Apr 9, 2020
Issue overview
Work on changing the order of the internal surface data (#7575) has tripped over some surprising diffs. For example, here's the cooling coil load and chiller load for the summer design day in 5ZoneWaterCooled_Baseboard, with develop and with ManageSurfaceHeatBal2. Similar behavior has been observed in 5ZoneCoolingPanelBaseboardAuto (both files have baseboard with a radiant fraction, but I'm not sure that's relevant) or maybe it is. The cooling coil loads a differ some, but the chiller load shows big diversions at night when the load is smaller.
On a wild guess (or goose chase), I tried increasing the minimum plant iterations to 10 (from the default of 2).
This alters the chiller load significantly in both branches.
![image](https://user-images.githubusercontent.com/4991075/70924116-9f174000-1fee-11ea-8e30-f2534fefb505.png)
Looking at just develop with the change in ConvergenceLimits:
Details
Some additional details for this issue (if relevant):
Checklist
Add to this list or remove from it as applicable. This is a simple templated set of guidelines.
The text was updated successfully, but these errors were encountered: