ZoneAirContaminantBalance E+ object

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1

I blame Chris for pointing me to this new and unknown world.

The result will be a possible rampage of questions to all you wonderful people! This one has to do with the above mentioned object in E+. According to the E+ I/O reference the implementation is something like this:

ZoneAirContaminantBalance, Yes, !- Carbon Dioxide Concentration
Outdoor CO2 Schedule, !- Outdoor Carbon Dioxide Schedule Name
Yes, !- Generic Contaminant Concentration
Generic Contaminant Schedule; !- Outdoor Generic Contaminant Schedule

It seems that can be an easy way to get a quite useful information on building performance (CO2 concentration in your zones).

However, and since I have never used the additional strings in HB, I would welcome your advice on the additional string below. Would something like this be enough? I apologize I cannot test it atm on this computer.

ZoneAirContaminantBalance, Yes, !- Carbon Dioxide Concentration
Default outdoor CO2 levels 400 ppm, !- Outdoor Carbon Dioxide Schedule Name
No; !- Generic Contaminant Concentration

Schedule:Compact,
Default outdoor CO2 levels 400 ppm, !- Name
Any Number, !- Schedule Type Limits Name
Through: 12/31, !- Field 1
For: AllDays, !- Field 2
Until: 24:00, !- Field 3
400 ; !- Field 4

Output:Variable, *, !- Key Value
Zone Air Carbon Dioxide Concentration, !- Variable Name
timestep; !- Reporting Frequency

Also, is anyone aware of the accuracy of this object? I am guessing it should include air extraction and/or MV?

2

Theodore,

I have not used this object but, if you are interested in trying to get the CO2 concentration in the room, I would just use the “airFlowVolume” output of the Read EP Result component along with the occupancy schedule to estimate the hourly CO2 concentration. That output of airFlowVolume is a sum of all outdoor air entering the building.

-Chris

3

Dear Theodore and Chris,

Thanks for your efforts.

Have you added any component in Ladybug Tools that can measure the indoor CO2 level?

Regards

4

Hello @TheodorosGalanos
Have you used this IDF to the additional strings of EP in HB?
I also need to measure zone CO2 concentration, but still not reached the results.

Hardi

5

Hi Hardi,

I just wonder to know can you model indoor CO2 concentration with ladybug-honeybee? any hint for reading results?

6

CO2 objects aren’t natively supported in Honeybee and you would have to use an OpenStudio Measure or additional IDF strings to add the CO2 objects to your Honeybee model.

1 Like
7

Thanks a lot Chris for the reply.
Best,