[Bldg-sim] DCV
Zoeteman, Mark R.
mrzoeteman at FTCH.com
Mon Dec 17 05:35:09 PST 2007
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
>
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