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Is it possible to change the ShadowCalculation Method in OpenStudio?

asked 2018-10-31 10:20:15 -0500

jbatt gravatar image

updated 2018-10-31 10:28:55 -0500

I'm trying to change the calculation method to DetailedTimestepIntegration. My hope is that I can do this somewhere in OpenStudio (though it doesn't seem to be accessible in the part of the interface that I would have expected). Alternatively, I can edit it directly in the IDF, but I'm not sure what other information I'd need to enter/if I would have to make any changes to the Calculation Frequency or Maximum Figures values.

ShadowCalculation,
  AverageOverDaysInFrequency,             !- Calculation Method
  20,                                     !- Calculation Frequency
  15000;                                  !- Maximum Figures in Shadow Overlap Calculations

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Update: more recent versions of Energy Plus (including 8.9 - which is what I'm working with) have renamed "DetailedTimestepIntegration" as "TimestepFrequency"...otherwise everything in this post still applies.

jbatt gravatar image jbatt  ( 2018-11-01 13:45:38 -0500 )edit

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answered 2018-10-31 11:21:20 -0500

The OpenStudio API for ShadowCalculation doesn't currently expose the calculation method. Instead of hand editing the IDF, you could create an EnergyPlus measure to change this as a cleaner solution than hand editing. This would also allow you to disable the measure for quick testing, and then enable it when you need it.

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Thanks! That sounds cleaner...I'll try that. So I've gathered that in addition to changing "AverageOverDaysInFrequency" for "DetailedTimestepIntegration," I need to remove the value from the !- Calculation Frequency field. Are there any other necessary removal or addition of values that you are aware of?

jbatt gravatar image jbatt  ( 2018-10-31 12:25:40 -0500 )edit

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Asked: 2018-10-31 10:20:15 -0500

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Last updated: Oct 31 '18