[Bldg-sim] Multiple roof heights

[pranita kothuru]

Hello -

I am new to eQuest and have been trying to model a sports center in the DD
Wizard. I created the basic plan in autoCAd and was able to trace it in
eQuest. The building has multiple roof heights (flat roof).

My question are:

1) how do we model a building with differnt roof levels.

Thank You.

Pranita.


On Fri, Aug 13, 2010 at 3:19 PM, Rimes, Christie
<Christie.Rimes at wspfk.com>wrote:

>  No, just specifying the natural ventilation in the Nat Vent Tab will be
> sufficient. If you also increase the infiltration than you are effectively
> doubling the natural ventilation and you will allow OA into the space when
> temperature conditions may not be suitable.
>
>
>
> [image: Christie Rimes, Building Simulation Analyst WSP Flack + Kurtz 405
> Howard Street, Suite 500 San Francisco, CA 94105 Direct: 415.402.2727 Main
> Tel: 415.398.3833 Fax: 415.433.5311 website: http://www.wspfk.com vCard:
> http://vcards.wspfk.com/vcardloader.php?filename=flackkurtz-christie-rimes-wspfk-com-1255981339.vcf
> image:]
>
>
>
> *From:* Kevin Kyte [mailto:KKyte at watts-ae.com]
> *Sent:* Friday, August 13, 2010 12:14 PM
> *To:* Rimes, Christie; Zhen Tian
>
> *Cc:* bldg-sim at lists.onebuilding.org
> *Subject:* RE: [Bldg-sim] LEED & Natural Ventilation
>
>
>
> Should you also complement this with changing the space infiltration
> schedules as well?
>
>
>
> Kevin
>
>
>  ------------------------------
>
> *From:* Rimes, Christie [mailto:Christie.Rimes at wspfk.com]
> *Sent:* Thursday, August 12, 2010 6:55 PM
> *To:* Zhen Tian
> *Cc:* bldg-sim at lists.onebuilding.org
> *Subject:* Re: [Bldg-sim] LEED & Natural Ventilation
>
>
>
> To include natural ventilation in a model all you need to do is fill out
> the Natural Ventilation Tab at the System level under OA as follows. All
> inputs have good descriptions of what needs to be entered so you shouldn’t
> have a problem defining your system.
>
> I am still currently building the model so am not sure if I am going to
> come up with any errors.
>
>
>
>
>
>
>
> [image: Christie Rimes, Building Simulation Analyst WSP Flack + Kurtz 405
> Howard Street, Suite 500 San Francisco, CA 94105 Direct: 415.402.2727 Main
> Tel: 415.398.3833 Fax: 415.433.5311 website: http://www.wspfk.com vCard:
> http://vcards.wspfk.com/vcardloader.php?filename=flackkurtz-christie-rimes-wspfk-com-1255981339.vcf
> image:]
>
>
>
> *From:* Zhen Tian [mailto:tianzhen9 at yahoo.com]
> *Sent:* Tuesday, August 10, 2010 10:21 AM
> *To:* Rimes, Christie
> *Subject:* Re: [Bldg-sim] LEED & Natural Ventilation
>
>
>
> Hi Chris,
>
> Regarding the natural ventilation in eQUEST, how do we use the S-G
> function? I cannot find any information in the DOE2.2 manual. Would you
> please share more information?
>
> Thank you very much.
>
> Regards,
>
> David
>
> --- On *Fri, 7/30/10, Rimes, Christie <Christie.Rimes at wspfk.com>* wrote:
>
>
> From: Rimes, Christie <Christie.Rimes at wspfk.com>
> Subject: Re: [Bldg-sim] LEED & Natural Ventilation
> To: "Chris" <floodyc at gmail.com>
> Cc: "bldg-sim at lists.onebuilding.org" <Bldg-sim at lists.onebuilding.org>
> Date: Friday, July 30, 2010, 2:40 AM
>
> eQuest, TAS and IES, I know can model natural ventilation. In IES and TAS
> you can actually model the operation of the windows by defining limits on
> indoor temperature, wind speeds etc. eQuest is a little more basic where you
> can use a S-G function for infiltration which calculates higher infiltration
> rates based on outside wind conditions. eQuest then calculates if indoor
> temperatures will be kept between the indoor temperatures based on the
> outside conditions. If yes than it will shut off the mechanical system and
> calculate 0 energy for that hour.
>
>
>
> Therefore in programs like IES and TAS you may be able to keep conditions
> below the set point even if the outdoor temperatures are hotter due to air
> movement etc. You may also want to come to an agreement with the client to
> allow a slightly higher set point, however you will need to also apply this
> to the baseline model. Otherwise for LEED, you can’t take account for the
> hours were naturally ventilation doesn’t provide comfort. Also note that the
> unmet load hours can be a maximum of 300 hours so potentially you could take
> credit for 300 hours for natural ventilation even if it is above the set
> point.
>
>
>
>
>
> [image: Christie Rimes, Building Simulation Analyst WSP Flack + Kurtz 405
> Howard Street, Suite 500 San Francisco, CA 94105 Direct: 415.402.2727 Main
> Tel: 415.398.3833 Fax: 415.433.5311 website: http://www.wspfk.com vCard:
> http://vcards.wspfk.com/vcardloader.php?filename=flackkurtz-christie-rimes-wspfk-com-1255981339.vcf
> image:]
>
>
>
> *From:* Chris [mailto:floodyc at gmail.com]
> *Sent:* Thursday, July 29, 2010 11:24 AM
> *To:* Rimes, Christie
> *Cc:* bldg-sim at lists.onebuilding.org
> *Subject:* Re: [Bldg-sim] LEED & Natural Ventilation
>
>
>
> And how did you model the natural ventilation?
>
> In summer when external temperatures are above the room setpoint natural
> ventilation during the day would not provide any cooling.
>
> On Thu, Jul 29, 2010 at 11:19, Rimes, Christie <Christie.Rimes at wspfk.com<http://mc/compose?to=Christie.Rimes@wspfk.com>>
> wrote:
>
> I am currently doing a naturally ventilated building for LEED and I believe
> that if the space is achieving indoor temperatures between the given set
> point using natural ventilation than the mechanical system energy is 0 for
> the proposed design. Any hours where natural ventilation can’t achieve
> indoor temperatures within the set points, a mechanical system needs to be
> modeled even if there isn’t one in the proposed building. This helps keep
> the unmet hours within the requirements for LEED.
>
>
>
> Cheers,
>
>
>
> [image: Christie Rimes, Building Simulation Analyst WSP Flack + Kurtz 405
> Howard Street, Suite 500 San Francisco, CA 94105 Direct: 415.402.2727 Main
> Tel: 415.398.3833 Fax: 415.433.5311 website: http://www.wspfk.com vCard:
> http://vcards.wspfk.com/vcardloader.php?filename=flackkurtz-christie-rimes-wspfk-com-1255981339.vcf
> image:]
>
>
>
> *From:* bldg-sim-bounces at lists.onebuilding.org<http://mc/compose?to=bldg-sim-bounces@lists.onebuilding.org>[mailto:
> bldg-sim-bounces at lists.onebuilding.org<http://mc/compose?to=bldg-sim-bounces@lists.onebuilding.org>]
> *On Behalf Of *Chris
> *Sent:* Thursday, July 29, 2010 11:13 AM
> *To:* bldg-sim at lists.onebuilding.org<http://mc/compose?to=bldg-sim@lists.onebuilding.org>
> *Subject:* [Bldg-sim] LEED & Natural Ventilation
>
>
>
> All,
>
>
>
> we regularly design and model buildings which rely in part on natural
> ventilation as a source of free cooling. The issue we are often faced with
> is how to capture this benefit when performing a LEED Appendix G analysis.
> Appendix G states that all conditioned spaces must have BOTH heating and
> cooling. We would like to remove mechanical coolig in the proposed design
> building and thus gain benefit when comparing to the mechanical cooling
> system in the reference baseline building.
>
>
>
> Has anyone tackled this issue and come to a satisfactory resolution?
>
>
>
> Thanks for your help.
>
>
>
> --
> Chris Flood BSc (Eng)
> Senior Building Analyst & Energy Modeller
>
>
>
>
> --
> Chris Flood BSc (Eng)
> Senior Building Analyst & Energy Modeller
>
>
> -----Inline Attachment Follows-----
>
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-- 
Pranita Kothuru, LEED AP
Carnegie Mellon University
MS in Sustainable Design 2009
pkothuru at andrew.cmu.edu
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