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# Running a simulation over the New Year

I'm trying to run a simulation for 14 days and gather the results from the final day as a representative day. My problem is that in some cases I want to collect results for a day in the first week of January.

The reason I'm running for two weeks is that I'm interested in the effect of storage, in particular how much I can undersize a boiler for a given storage set-up. The problem is that EnergyPlus finishes the warm-up period with all storage tanks at their target temperature. I have some very large storage tanks in some of my models which distorts the amount of fuel used on my representative day if I don't use this additional run-in period to let them reach their real operating profile.

Is there any way to do this?

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Yes, and in your case that should be pretty easy

You want to use RunPeriod:CustomRange.

As stated in the I/O reference guide for this object:

Begin Year

This numeric field should contain the beginning year for the custom range. Though all EnergyPlus (EPW) weather files contain a year/year field, the RunPeriod object does not use this field (previous object). The RunPeriod:CustomRange object causes the program to look specifically for the begin date specified by these three fields (i.e. Begin Month, Begin Day of Month, Begin Year).

You'll have to modify the .epw slightly to get it to work. Copy at least January and paste it at the end and change the Year field by adding one to it.

There is a thread on the EnergyPlus Support Group here: Processing multiple years in epw

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I am looking for the same approach, I want to see the effect of the storage size on my system. I need to run my model from September to April to see the whole picture. Using Runperiod:CustomRange, I have to specify the begin year and end year. Is there anyway to just use the same weather data (typical year)?

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Navid, this isn't an answer, it's a question, or at least a comment. And no, as far as I know you do have to slightly modify the epw as I said in my answer, though it's easy to do it.

( 2015-11-27 02:54:13 -0600 )edit