Grasshopper

algorithmic modeling for Rhino

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?

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Replies to This Discussion

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

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