Where I can refer to 'unique key name'?

asked 2017-09-20 20:26:58 -0500

katsuya.obara

2085 ●1 ●4 ●14

updated 2017-09-21 10:33:17 -0500

__AmirRoth__

4436 ●5 ●17 http://bleedinggreenna...

I am new to EMS. So this may be quite fundamental problem.
When I try to use EMS to change chiller performance curve according to outdoor air temperature, I got following error.

    ** Severe  ** Invalid Output:Variable or Output:Meter Index Key Name =
   **   ~~~   ** For Output:Variable or Output:Meter = CHILLER EVAPORATOR OUTLET TEMPERATURE
   **   ~~~   ** Entered in EnergyManagementSystem:Sensor=CHWT
   **   ~~~   ** Unique Key Name not found.

I guess this is because EnergyPlus cannot find specific chiller since I implement multiple chillers. However, I cannot find where I should look at to find this unique key name.

Can anyone tell me where I can find these information?

Thank you.

answered 2017-09-20 21:41:03 -0500

rraustad

13599 ●72 ●12 http://www.fsec.ucf.edu/

updated 2017-09-20 21:51:55 -0500

Is this what you are trying to do?

EnergyManagementSystem:Sensor,
  CHWT,                                  !- Name
  Chiller Evaporator Outlet Temperature, !- Output:Variable or Output:Meter Index Key Name
  MyChiller;                             !- Output:Variable or Output:Meter Name

You can use any report variable found in the rdd file as a sensor. For chillers, I ran the example file 5ZoneAirCooled.idf and looked at the rdd file after the simulation completed. I added Output:VariableDictionary,IDF; to the file so the rdd file would print in a specific format. Then in the rdd you see this:

Output:Variable,*, Chiller Evaporator Outlet Temperature,hourly; !- HVAC Average [C]

Where the * is the key name of the chiller for report variables. If you use the asterisk you get all chiller outlet temperatures for all chillers. If you add the key name you get the chiller outlet temperature for the specific chiller.

Output:Variable,MyChiller,Chiller Evaporator Outlet Temperature,hourly; !- HVAC Average [C]

For EMS sensors the Output:Variable or Output:Meter Index Key Name is the name of the report variable in the rdd file. The Output:Variable or Output:Meter Name is the name of the object that would report that report variable (the name of the chiller in this example).