[Bldg-sim] natural ventilation scenario and LEED , Modelling cold rooms

[Jeremiah Crossett]

Jill,
It seems you may be mis-understand the questions-- also the normal policy
of the list is to respond to individual posts on their own so that other
people who may have other ideas about the subject then yourself can reply.

With regards to fixed window natural ventilation: Christian who posed the
natural ventilation question has most likely completed more LEED projects
then most people on the list, surly he knows about LEED user and also knows
that there are countless loopholes in and interpretations of ASHRAE 90.1,
especially for natural ventilation a subject that is loosely defined by the
so called rules.  I would suggest to use the design builder external CFD
module to demonstrate your concept. I think that it sounds like a situation
of a semi heated space,  and that you may be able to make a case for the
same in the baseline as proposed if this an existing building and this is
the the condition of the building envelope before renovation-- if it is a
new building then the design could be changed to be acceptable by the
standards of 90.1 if necessary.

With regards to cold rooms; you could use the Energy Plus walk in
refrigerator objects to model them, and could do an exceptional calculation
to claim the energy saving benefits.



* Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions*
*120 E. Pritchard St.  | Asheboro, NC 27203   |
Mobile 503-688-8951www.phasechange.com <http://www.phasechange.com/>  *






On Sat, Nov 23, 2013 at 6:47 AM, Jill Dalglish <jill at jilldalglish.com>wrote:

>  You both may get additional answers by posting your questions to the
> LEEDuser.com since these are mostly LEED questions.
>
> For the nat. ventilation question: Is there any mechanical equipment at
> all in the building? It is my understanding that you can model the HVAC
> that you have in order to submit to LEED. If not, I think you'll need to
> share more information about the building's geometry to get an answer.
> Being registered as a LEED project means nothing as far as it qualifying as
> an eligible project. Also, you can't model operable openings that don't
> exist. Sorry!
>
> For the cold rooms question: refrigeration is a process load and all
> process loads must be modeled the same in the baseline and proposed cases,
> unfortunately. The only advantage you get from more efficient process loads
> is less "noise" in the overall model which helps in your overall percentage
> of energy savings.
>
>
> On 11/22/2013 2:01 PM, bldg-sim-request at lists.onebuilding.org wrote:
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> Today's Topics:
>
>    1. natural ventilation scenario and LEED (Christian Stalberg)
>    2. Modelling cold rooms (Rathna Shree)
>
>
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> --
>
> *Jill Dalglish, PE, LEED AP BD+C*
>
> S/W/DBE Certified Business
> *www.dalglishdaylighting.com* <http://www.dalglishdaylighting.com/>
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