Output:Table:Annual {Maximum} not matching

asked 2020-06-26 09:05:59 -0500

Vasco Zeferina gravatar image

updated 2020-06-26 10:16:41 -0500

In my EnergyPlus simulation, I am requesting and comparing the maximum demand results for multiple variables/meters from different report summaries. For example, I am looking at the Electricity demand for the entire facility (Electricity:Facility) at the Demand End Use Components Summary. On the other hand, I am requesting an Output:Table:Annual summary for the maximum Electricity:Facility and other variables at that same moment.

Results on the Annual Table report are substantially higher, and the timestamp does not match from the regular summary table (Demand End Use Components Summary). Why is this happening?

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Comments

1

I fully agree with your observation, just faced it in a project !.

I can say that DemandEndUseComponentsSummary, and in general higher level Output (e.g. ABUPS vs. LEED Summary), are right, conversely many Output:Table:Annual and Output:Table:Monthly do not give exaclty right values ​​(checked against timestep data trend). Definitely annoying. I Think something in post-process happens.

For example: Output:Table:Annual and Output:Table:Monthly can give as 'time of peak' values that cannot match simulation timestep : e.g. 30-JUL-15:53 with 6 timestep (= 10 min.).

Ag gravatar imageAg ( 2020-06-26 09:47:54 -0500 )edit

Moreover some value occurs at 08:61 or other timing not rasonable at all !

Hopefully some developer could pass here and give his point of view.

Ag gravatar imageAg ( 2020-06-26 09:50:52 -0500 )edit

"For example: Output:Table:Annual and Output:Table:Monthly can give as 'time of peak' values that cannot match simulation timestep : e.g. 30-JUL-15:53 with 6 timestep (= 10 min.).". You're forgetting that there is a "Detailed" timestep (for HVACSystem) that's lower than the (Zone) Timestep you enter in the Timestep IDF object.

Julien Marrec gravatar imageJulien Marrec ( 2020-06-26 10:07:24 -0500 )edit

@Julien Marrec, In my case, I am looking at the Electricity:Facility maximum. It is so odd that the maximum is 3 times larger and at completely different date.

Vasco Zeferina gravatar imageVasco Zeferina ( 2020-06-26 11:18:07 -0500 )edit

@Julien Marrec , yes you are right about HVACSsytem vs. Zone timestep. Anyway:

  • Some time of peak has no sense (e.g 08:61)

  • Monthly table built on Facility Total Produced Electric Power output variable gives a maximum different value than rhet reported into Demand End Use Components Summary

  • Many other little errors, for exemple in building area conditioned/unconditioned/total , miscellaneous process load (EAp2-17a tab in LEED Summary report), and more ....

Ag gravatar imageAg ( 2020-06-27 05:44:09 -0500 )edit