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Sum up Variables Over SystemTimeStep (EMS_E+)

asked 2018-11-24 09:16:20 -0600

Daniel.A gravatar image

updated 2018-11-24 16:13:47 -0600

We know that each ZoneTimeStep maybe consists of some SystemTimeStep. I want to sum a special variable over all SystemTimeSteps at a ZoneTimeStep and then report it as schedule. The @TrendSum function just provide sum of variables for several ZoneTimeSteps not for SystemTimeStep.

Sincerely Daniel.A

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answered 2018-12-04 14:57:06 -0600

First, define a custom output variable at the system timestep which is summed (not averaged). Let's say the value you are reporting is "MyEMSOutput".

EnergyManagementSystem:OutputVariable ,
MyEMSOutputVariable[units], !- Name
MyEMSOutput , !- EMS Variable Name
Summed , !- Type of Data in Variable
SystemTimeStep; !- Update Frequency

Then, report it at the zone timestep frequency. EnergyPlus will accumulate (sum) the variable at the end of every system timestep and then report it at the end of every zone timestep.

Output:Variable,
*, !- Key Value
MyEMSOutputVariable, !- Variable Name
Timestep; !- Reporting Frequency
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Comments

thank you for answer...I did it and it works when I just intend to have an Output:Variable. Suppose the situation I intend to set a schedule as sum of SystemTimeStep variable over ZoneTimeStep.

At first we do steps you mentioned above, Then I write this code: Set ScheduleTest=MyEMSOutputVariable and set Calling manager: EndOfZoneTimestepBeforeZoneReporting but what I Observed is:

TimeStep=6

Timestep MyEMSOutputVariable ScheduleTest

00:02 1
00:05 0
00:07 1
00:10 0 0
00:11 1
00:13 0
00:16 1
00:20 1 1

Daniel.A gravatar imageDaniel.A ( 2018-12-09 00:49:09 -0600 )edit

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Asked: 2018-11-24 09:16:20 -0600

Seen: 45 times

Last updated: Dec 04