You should be using a Dual Set Point Thermostat and a separate SetpointManager for each coil. SetpointManager:SingleZone:Cooling for CC and SetpointManager:SingleZone:Heating for HC (or could use SetpointManager:MultiZone:Cooling;Average and SetpointManager:MultiZone:Heating;Average). If you have a draw through fan, you will need to store these SP's at nodes other than the CC/HC outlet node, and use a SetpointManager:MixedAir object to recalculate a new set point including fan heat and place these new SP's at the outlet of the CC and HC.
On 11/10/2011 10:22 AM, ntraughpee wrote:
PS: As I read it I was understanding that by using the HVACTemplate:System:VAV and having no availability schedule for either the HC/CC it would always be available when needed. Then I added in a constant set point, however from looking at the node temperature points in Results Viewer it is obvious that the HC/CC are operating year long at a constant set point.
The system itself should be putting out like 55 degree air in max cooling, and 100 degree air for max heating. I have been trying to use the OA Temperature reset but again the coils seem to never shut down.
What am I missing?
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "ntraughpee" <matthew.sverre.anderson@...> wrote:
>
> Hello Everybody, I have a question that likely (or at least hopefully!) has an easy answer and I am simply too foolish to know it.
>
> So I have a building which I modeled as a VAV with no reheat, and no preheat coil. I want the coils to operate as needed and simply ignore any frost warnings. However, I currently have no schedule for either since there will be many times during the fall/spring where we might need to heat/cool during the same day or during the week.
>
> The problem I am currently having is that the heating/cooling coils are operating year long at the same time. I want the HC to operate when the building needs heating, the CC to operate when the building needs cooling (neither to operate at the same time). Am I thinking about this incorrectly?
>
> Also is there a way to implement a dead band above/below the set point where the system is "satisfied" to prevent the system from "slamming" on/off?
>
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