[Bldg-sim] LEED Kitchen/Laundry HVAC Systems

[Rob Hudson]

I completely agree with you Fred.  This is the same logic that i followed.
 Unfortunately my superiors do not agree with this logic, even though I have
shown them the same exception that you mention.  Their logic states that
process loads shall be the same in both models, and anything associated with
process loads (such as cooling for a data room or exhaust/make up air for a
kitchen) do not serve any purpose except for process and therefore is also
process.

Does anyone have anything from USGBC clarifying this issue?  I have looked
through the interpretations and nothing speaks to the HVAC equipment of
process loads.

Thanks for the input so far,

Rob

On Thu, Oct 27, 2011 at 4:51 PM, Fred Betz <fbetz at aeieng.com> wrote:

> HVAC energy consumption caused by process loads cannot be called process
> loads. Nor would you want it to be a process load, because then you can’t
> take credit for savings or at least not as easily. ****
>
> ** **
>
> Correct, your electrical or IT room with 90kW baseline is a system 3, and
> your Proposed can be an efficient design. ASHRAE 90.1-2007 G3.1.1 exception
> b allows you to apply system 3 for zones with large process loads. ****
>
> ** **
>
> This can be a huge source of energy savings. Enjoy it now, because rumor
> has it that the next version of 90.1 will set an alternate baseline for IT
> rooms and the like, and system 3 will no longer be applicable because the
> energy savings can be ridiculously large. ****
>
> ** **
>
> ** **
>
> ** **
>
> *Fred Betz**  *PhD., LEED AP
> Sustainable Systems Analyst****
>
>  ****
>
> *AEI* | AFFILIATED ENGINEERS, INC.
> 5802 Research Park Blvd. | Madison, WI  53719
>
> P: 608.236.1175 | F: 608.238.2614
> fbetz at aeieng.com  |  *www.aeieng.com*  ****
>
> ** **
>
> ** **
>
> *From:* Rob Hudson [mailto:rdh4176 at gmail.com]
> *Sent:* Thursday, October 27, 2011 12:54 PM
>
> *To:* bldg-sim at lists.onebuilding.org
> *Subject:* [Bldg-sim] LEED Kitchen/Laundry HVAC Systems****
>
> ** **
>
> In the situation that a design is utilizing an efficient exhaust/make up
> air system, the LEED book says that an exceptional calculation may be used
> to help quantify savings.  This leads me to believe that the kitchen cooking
> equipment is process, but the HVAC equipment is not.  My office has been
> having a "discussion" about whether HVAC equipment that conditions air for
> process equipment is considered process as well.****
>
> ** **
>
> Another example that is plaguing me:  an electrical rack room has 90 kW of
> stuff and requires 25 tons of cooling.  If i use an efficient design, can i
> take credit for it by comparing my design to a baseline of system 3 (PTAC w/
> DX cooling and furnace heating)?  I believe that this HVAC system should be
> allowed to get credit, but others argue that because it serves process
> equipment, then it is "process" heating/cooling.****
>
> ** **
>
> Any thoughts from LEED AP out there? (i'm still working on getting my LEED
> AP).****
>
> ** **
>
> Thanks,****
>
> ** **
>
> --
> Rob Hudson****
>



-- 
Rob Hudson
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