[Bldg-sim] ASHRAE systems exception B interpretation

Tue Oct 13 10:17:41 PDT 2015

Veronica,
This may be worth a question to your LEED / GBCI review team so that you
have high confidence *before *creating the entire model.

I think that the Baseline model should represent a realistic design,
something you would expect from a responsible energy-conscious designer.
That way the benefits of the Proposed system will also be realistic.

On Tue, Oct 13, 2015 at 12:49 PM, Veronica Ochoa <
veronica.ochoa at hurleypalmerflatt.com> wrote:

> Jim, thanks for your prompt response.
>
>
>
> The average peak load for my systems is as follows:
>
> Level -2: 578 W/m2
>
> Level -1: 392 W/m2
>
> Level 0: 186 W/m2
>
> Level 1: 83 W/m2
>
>
>
> Of the rooms in each system only 6 zones are within the 31W/m2 difference,
> therefore meeting the Sys8 criteria. The rest of the zones differ from the
> average cooling loads by anything from 50 W/m2 to 1,200 W/m2, leaving 44
> zones to fall under the System#4 (B) exception. My question is if I should
> have Sys#4 created for each zone, therefore ending up with 44 System#4’s
> which seems a bit excessive and if I could simplify this by creating a
> system per floor or per different setpoint groups?
>
>
>
> Thanks again,
>
>
>
> Veronica Ochoa
>
> Consultant
>
> *hurleypalmerflatt*
>
> *building* *sustainability*
>
> *d:*
>
> +44 20 7535 3750
>
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>
> veronica.ochoa at hurleypalmerflatt.com
>
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> *From:* Jim Dirkes [mailto:jim at buildingperformanceteam.com]
> *Sent:* 13 October 2015 17:38
> *To:* Veronica Ochoa
> *Cc:* bldg-sim at lists.onebuilding.org
> *Subject:* Re: [Bldg-sim] ASHRAE systems exception B interpretation
>
>
>
> Veronica,
>
> I'm not sure if I understand your problem, but the exceptions for
> non-predominant HVAC sytems are based on
>
> "Peak thermal loads that *differ *by xx W/m2 or more from the average of
> other spaces..."
>
>
>
> Thus, if all zones are 30 W/m2, they should be modeled with the normal
> Baseline HVAC.  If, however, one or more zones is 15W/m2 or 50 W/m2, you
> have justification for using Systems #3 or #4.
>
>
>
> On Tue, Oct 13, 2015 at 11:37 AM, Veronica Ochoa <
> veronica.ochoa at hurleypalmerflatt.com> wrote:
>
> Hi,
>
>
>
> I’m modelling a data center with 50 thermal zones for LEED EAp2/c1
> purposes. The baseline system determined based on area and building type is
> system 8. However when doing the load deviation average to determine
> suitability for System 4 (under exception B), all but 6 zones are greater
> than the 31 W/m2 of the averaged cooling load per system/floor. This means
> that I will have 6 zones (2.5% of total area) as system 8 and 44 zones as
> system 4. Do I need to follow the exception that says that each zone served
> by System 4 should be modelled as one zone per system?? I find this a bit
> too much… I was wondering if you can simplify this by grouping similar
> spacetypes by setpoints or floors and reduce the number of systems.
>
>
>
> Also, in the preliminary submission 100% of the zones were submitted as
> system 4, but this was noted by the USGBC reviewer as an error (as it was
> based on the average of the entire building not per system). As it has been
> now corrected and only 2.5% of the zones will be system 8, we are
> estimating the difference will be negligible. Would a narrative explaining
> this suffice? Has anyone been in this situation and how did you approach
> it?
>
>
>
> Many thanks in advance for your help,
>
> Veronica Ochoa
>
> Consultant
>
>
>
> *hurleypalmerflatt*
>
> *building* *sustainability*
>
>
>
> *d:*
>
> +44 20 7535 3750
>
> *t:*
>
> +44 20 7535 3100
>
> *e:*
>
> veronica.ochoa at hurleypalmerflatt.com
>
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> --
>
> James V Dirkes II, PE, BEMP, LEED AP
> CEO/President
> The Building Performance Team Inc.
> 1631 Acacia Dr, GR, Mi 49504
>
> Direct: 616.450.8653
> jim at buildingperformanceteam.com
>
> Website <http://buildingperformanceteamcom>l  LinkedIn
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>
> “…happiness is the joy produced in us by truth. To be truly happy means
> coming to know how things really are, experiencing …reality in its ultimate
> root…
> What matters more to one’s happiness than getting more freedom and power
> is the end toward which we order whatever freedom and power we have. Unless
> we order ourselves to the truth, more freedom and more power will bring
> only more unhappiness, examples of which abound.
>

-- 

James V Dirkes II, PE, BEMP, LEED AP
CEO/President
The Building Performance Team Inc.
1631 Acacia Dr, GR, Mi 49504

Direct: 616.450.8653
jim at buildingperformanceteam.com

Website <http://buildingperformanceteamcom>l  LinkedIn
<https://www.linkedin.com/pub/jim-dirkes/7/444/413>

“…happiness is the joy produced in us by truth. To be truly happy means
coming to know how things really are, experiencing …reality in its ultimate
root…
What matters more to one’s happiness than getting more freedom and power is
the end toward which we order whatever freedom and power we have. Unless we
order ourselves to the truth, more freedom and more power will bring only
more unhappiness, examples of which abound.
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