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Why is the infiltration design value not reporting in OpenStudio?

asked 2018-05-15 21:37:14 -0500

RCulham gravatar image

I am creating a new model in the most current OpenStudio version, 2.5.0 with a fixed infiltration rate in air changes per hour. In the space type definition grid view, I placed an infiltration object from the library into the appropriate column, changed the name and then modified the flow parameter and selected the air change per hour option and used the always on schedule.

The output report shows no infiltration amount.

I am more familiar with using the IDF-Editor and modifying the EnergyPlus idf code in an text editor. I would do that, however the functionality of OpenStudio is required for other aspects of this work. Perhaps I have missed something simple?

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Is the spaceType for which you assigned the infiltration object actually used by a space, that in turn is in a thermal zone?

Julien Marrec gravatar imageJulien Marrec ( 2018-05-16 02:50:36 -0500 )edit

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answered 2018-05-16 12:03:43 -0500

updated 2018-05-16 12:04:16 -0500

Seems like either the infiltration object didn't get associated with the space type, or that space type isn't assigned to any thermal zones. The space type summary in the standard report will list how many spaces are assigned to a space type, and will list the internal loads objects assigned to that space type, including infiltration. If you assigned internal loads directly to a space they won't show up in this table.

Regardless of whether infiltration is added to space types or directly to spaces, the impact of it would show up in the "Outdoor Air" table, along with mechanical and simple ventilation. It lists the average, min, and max values. This table pulls from the EnergyPlus tabular data in the SQL results. The space type summary pulls from model input data in the OSM.

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answered 2018-05-17 12:19:41 -0500

RCulham gravatar image

I ran this project file with Ideal Loads checked for all of the Zones. I than ran the file with the HVAC systems enabled and in drilling down through the output data, the infiltration rate was being accounted in the energy simulation.

However, all of the cells in the EnergyPlus html output file tables Average Outdoor Air During Occupied Hours and Minimum Outdoor Air During Occupied Hours were blank. This is why I thought the infiltration object had not been applied.

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Asked: 2018-05-15 21:37:14 -0500

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Last updated: May 17 '18