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Output average demand over a specific period with EnergyPlus?

asked 2019-01-30 18:26:52 -0600

pajordan gravatar image

updated 2019-01-30 18:36:15 -0600

Is it possible to use tabular output to report average demand over a specific period with EnergyPlus?

I want to add a table to be included in the eplustbl.htm file that shows "peak demand" as defined by a particular utility or region (ex. California DEER peak demand savings are the average kW reduction over a 9-hour window - 2pm to 5pm over a three-day period).

I currently do this via post-processing of hourly output:variable output, but I was wondering if EnergyPlus can do the averaging for me somehow and report it in the .htm file.

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answered 2019-02-07 16:34:18 -0600

If you wanted the monthly and annual averages during certain time windows, then you could use Output:Table:Monthly with the following columns:

  1. "Schedule Value" for a schedule that is 1 from 2pm-5pm on applicable day types, type HoursPositive
  2. "Facility Total Electric Demand Power", type SumOrAverageDuringHoursShown - this will average during the hours counted in the previous column.

But if this is supposed to be the maximum 3-day moving average, you'll need to use an EMS (EnergyManagementSystem:*) program to do the calculations and generate a custom output variable. If you want the result for that to end up in the html output, you can use Output:Table:Monthly to report the monthly and annual maximum of the custom EMS output variable.

I also considered using UtilityCost:Ratchet but I don't see a way to set the demand window to 9 hours.

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This is so cool - thank you very much! I took the first approach of using Output:Table:Monthly and it seems to work great.

A couple notes: The Variable or Meter Name field can also just accept a schedule name (i.e., no need to use the Schedule Value variable). The variable as defined in the .rdd specifies whether or not it will be summed or averaged (ex. Output:Variable,*,Cooling Coil Electric Power,hourly; !- HVAC Average [W])

A follow-up question - what is the syntax in the Variable or Meter Name field for reporting out for just one key designator (such as a particular zone or system)?

pajordan gravatar imagepajordan ( 2019-02-20 12:45:13 -0600 )edit

I am playing with reporting just HVAC system demand (heating coil, cooling coil, and fan) - using the above approach creates a separate monthly report for each system component (i.e., there will be a table for System1 heating coil, another table for System1 cooling table, etc.) - is there a way to have all of the output in one table?

pajordan gravatar imagepajordan ( 2019-02-20 12:50:56 -0600 )edit

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Asked: 2019-01-30 18:26:52 -0600

Seen: 131 times

Last updated: Feb 07