This is the same name as one would use for the field called Key Value in an Output:Variable input object. It will be a name you chose for the associated ZoneHVAC:LowTemperature:ConstantFlow input object.
The easiest way to get a listing of the keys used for a specific output variable is to do a pre-run adding an Output:Variable request for it with the key value wildcard “*.” Then the eso/csv output will include reports for all instances of that output and you can see how they are named.
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Geert Bellens
Sent: Monday, May 09, 2011 10:10 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] EMS: not clear which "Index Key Name" to use.
The EMS documentation mentions the following for a sensor:
"Field: Output:Variable or Output:Meter Index Key Name
The key reference for the specified report variable. For example, if System Node Temp is the report variable, the unique node name is the key. The Key Name field should be omitted for weather variables and meters because they do not have a key."
I want to use the report variable "Constant Flow Low Temp Radiant Water Outlet Temp" as input for my sensor.
It's not realy clear to me, which Index Key Name I have to us for this output variable.
Geert
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