[BLDG-SIM] CO2 monitoring

[John Aulbach]

Peter:

Yes, all DCV stuff is functioning (download Version
3.6). I just used this on an office building project
in Pasadena, CA. Still a bit of black magic to me,
until I start printing some hourly printouts for the
data.

--- Peter Moberg <peter at insitegroup.net> wrote:

> Jaya,
>  
> I don't know if these are fully functional yet, but
> the help in the latest
> version of Equest has the following:
>  
> DCV-RETURN-SENSOR This codeword instructs the
> program to model a DCV device
> that uses a CO2 differential between the SYSTEM
> return air stream and OA
> intake air stream to determine the hourly minimum OA
> fraction. The program
> calculates the OA minimum requirement and sets the
> minimum damper position
> hourly based upon the sum of the ZONE requirements.
> Each zone OA requirement
> is calculated based upon the hourly maximum of
> either OA-CFM/PER (times the
> NUMBER-OF-PEOPLE adjusted by the hourly
> PEOPLE-SCHEDULE) or a minimum OA
> ventilation rate. The zone minimum OA ventilation
> rate is either
> MIN-OUTSIDE-AIR if specified or the maximum of
> OA-CHANGES (times the zone
> VOLUME/60), OA-FLOW/AREA (times the zone AREA.)
> 
> DCV-ZONE-SENSORS   This codeword instructs the
> program to model a DCV device
> that uses the highest CO2 differential between the
> each ZONE air and OA
> intake air stream to determine the hourly minimum OA
> fraction. The program
> calculates the OA minimum requirement and sets the
> minimum damper position
> hourly using the “critical” zone requirement; the
> critical zone requirement
> is defined as the zone having the highest fraction
> of OA relative to its
> hourly supply air flow rate. Each zone OA
> requirement is calculated based
> upon the hourly maximum of either OA-CFM/PER (times
> the NUMBER-OF-PEOPLE
> adjusted by the hourly PEOPLE-SCHEDULE) or a minimum
> OA ventilation rate.
> The zone minimum OA ventilation rate is either
> MIN-OUTSIDE-AIR if specified
> or the maximum of OA-CHANGES (times the zone
> VOLUME/60), OA-FLOW/AREA (times
> the zone AREA.). The value of the zone minimum OA
> ventilation flow rate is
> divided by the specified/calculated zone supply flow
> to calculate hourly
> zone OA fraction; the zone with the highest hourly
> flow fraction value is
> the “critical” zone.  Setting the sum of the ZONE OA
> flow requirements
> divided by the system total supply fan flow to X,
> and letting the critical
> zone OA fraction be denoted as Z, the system hourly
> minimum OA flow fraction
> is then X/(1+X-Z)
> 
> Peter Moberg
> InSite Group, Inc.
> 310 SW 4th Ave. Suite 1120
> Portland, OR 97204
> Ph. 503 222 2044
> Fax 503 222 5924
> 
>   _____  
> 
> From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com]
> On Behalf Of Jaya
> Mukhopadhyay
> Sent: Wednesday, August 23, 2006 10:33 AM
> To: BLDG-SIM at gard.com
> Subject: [BLDG-SIM] CO2 monitoring
> 
> 
> Hello:
> Can anybody give me a lead on how to simulate CO2
> monitoring.
> I was thinking of MIN-AIR-SCH in the SYSTEM-AIR
> command......am I right?
> Thanks
> Jaya
> 
> 
>   _____  
> 
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