[Bldg-sim] DCV

[Zoeteman, Mark R.]

I've read the Bldg Sim DCV threads. For a LEED NC v2.1 submittal which
uses ECB method (not appendix G), could eQ v3.6 be used to show DCV
savings (for exceptional calculation method of ASHRAE 90.1-1999, chapter
11.5).

Is ASHRAE 90.1-1999, chapter 11.5 exceptional calculation method still
required to document DCV savings? This question is for a NC v2.1
submittal not v2.2.

Mark Zoeteman, FTC&H

-----Original Message-----
From: BLDG-SIM at GARD.COM [mailto:BLDG-SIM at GARD.COM] On Behalf Of John
Aulbach
Sent: Wednesday, August 23, 2006 5:13 PM
To: BLDG-SIM at GARD.COM
Subject: [BLDG-SIM] CO2 monitoring

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
>