[Bldg-sim] LEED EAC1 Exceptional calcs - heating consumption

[Cheney]

Hi Nick,

I can not agree with you more. Ashraf will have to answer why such 40%
reduction is not reflected in the original energy modeling.

The only divergence is the example with which you believe the appliances
fall into "plug loads" whereas I believe they could be "process one". Again,
it really depends on which LEED system (2009 or older version) we are using.
No process loads will be included in modeling under the old LEED system. In
another words, no penalty for heating due to reduced process load. However,
your methodology is accurate under the new LEED since both plug load and
process load should be involved in energy modeling.

Regards,

Cheney

LinkedIN @ http://ca.linkedin.com/pub/yu-cheney-chen/27/637/72b



On Wed, Oct 5, 2011 at 9:30 AM, Nick Caton <ncaton at smithboucher.com> wrote:

> Good point Cheney!****
>
> ** **
>
> I suppose I have a more general understanding that “exceptional
> calculations” exist for when you have designed energy saving measures which
> cannot be credited following 90.1/LEED “to the letter.”****
>
> ** **
>
> To use your example of improved appliance efficiencies, my intuition would
> be to produce extra documentation/calculations to substantiate a certain %
> reduction in installed plug loads, then I’d apply that reduction to the
> proposed model.  These calculations and a brief description of how they were
> compiled and applied to the proposed model would be uploaded and referenced
> alongside the modeling templates.  Perhaps my terminology is off and this is
> not really an “exceptional calculation?”****
>
> ** **
>
> But to clarify for the topic at hand, I suppose my response might best
> include another query: what is this hard-wiring strategy and why isn’t it
> already in the model?  It’s possible an LPD reduction would not adequately
> reflect whatever is really going on.****
>
> ** **
>
> ~Nick****
>
> ** **
>
> [image: cid:489575314 at 22072009-0ABB]**
>
> * *
>
> *NICK CATON, P.E.***
>
> SENIOR ENGINEER****
>
> ** **
>
> Smith & Boucher Engineers****
>
> 25501 west valley parkway, suite 200****
>
> olathe, ks 66061****
>
> direct 913.344.0036****
>
> fax 913.345.0617****
>
> www.smithboucher.com* *****
>
> ** **
>
> *From:* Cheney [mailto:chenyu73 at gmail.com]
> *Sent:* Wednesday, October 05, 2011 11:07 AM
> *To:* Nick Caton
> *Cc:* Ashraf Khan; bldg-sim at lists.onebuilding.org
> *Subject:* Re: [Bldg-sim] LEED EAC1 Exceptional calcs - heating
> consumption****
>
> ** **
>
> Well, my understanding is that exceptional calculation is used to document
> meansres that may not be adequately modelled in a simulaiton program. Some
> examples are lab exhaust system, appliance efficiencies in high-rise
> residential building, etc. How do you define your hard-wired lighting
> calculation from this point of view? ****
>
>  ****
>
> Remodeling with reduded LPD is necessary provided your hard-wired lighting
> reduction affects internal heat gain and you would expect more heating
> energy in this manner. I guess it is what the reviewer expect to see unless
> you can  prove him/her that your reduction will not trigger heating/cooling
> energy variation. ****
>
>  ****
>
> Regards, ****
>
>  ****
>
> Cheney****
>
>  ****
>
> LinkedIN @ http://ca.linkedin.com/pub/yu-cheney-chen/27/637/72b ****
>
>
>
> ****
>
> On Wed, Oct 5, 2011 at 7:03 AM, Nick Caton <ncaton at smithboucher.com>
> wrote:****
>
> I think something is missing in the story here…****
>
>  ****
>
> A reduction of lighting consumption is claimed to reduce heating
> consumption?****
>
>  ****
>
> As you say, lights are an internal heat source to some extent… reducing the
> lighting energy consumed by a significant fraction should cause a relative
> increase in heating and a reduction of cooling energies, right?  I’m going
> to assume the reviewer’s vocabulary is simply flipped around and this is the
> point they were trying to make:  Changing lighting should affect
> heating/cooling consumptions.****
>
>  ****
>
> As to how you document this – It would seem simplest if you simply worked
> your “exceptionally calculated” reduction back into the model.   From your
> description I don’t know exactly what your “hard-wiring” strategy is that’s
> chopping off 40%, but applying a factor to the space LPD’s may be a decent
> approach.  You could then demonstrate before/after results showing
> lighting/heating/cooling consumptions moving about by setting up  a
> parametric run and using those reports.****
>
>  ****
>
> ~Nick****
>
>  ****
>
> *Error! Filename not specified.*****
>
> * *****
>
> *NICK CATON, P.E.*****
>
> SENIOR ENGINEER****
>
>  ****
>
> Smith & Boucher Engineers****
>
> 25501 west valley parkway, suite 200****
>
> olathe, ks 66061****
>
> direct 913.344.0036****
>
> fax 913.345.0617****
>
> www.smithboucher.com* *****
>
>  ****
>
> *From:* bldg-sim-bounces at lists.onebuilding.org [mailto:
> bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *Ashraf Khan
> *Sent:* Wednesday, October 05, 2011 8:03 AM
> *To:* bldg-sim at lists.onebuilding.org
> *Subject:* [Bldg-sim] LEED EAC1 Exceptional calcs - heating consumption***
> *
>
>  ****
>
> I have performed Exceptional calculations in EAC1 credit for internal
> hard-wired lighting. I achieved savings up to 40%. ****
>
>  ****
>
> In Preliminary review, I received below comment ****
>
>  ****
>
> *“It is does not appear as if the reduction in heating consumption was
> considered. Address the reduction in space heating and ensure the
> consumption is appropriately reduced, and provide a revised template and
> updated energy model output summaries reflecting the changes.”*****
>
>  ****
>
>  ****
>
> As light generates heating, so leed reviewer is requesting to provide the
> heating consumption calculations and to achieve more savings as it directly
> impact on cooling, even though calculations performed exceptionally.****
>
>  ****
>
> Could you please guide how to perform these heating consumption
> calculations and how to incorporate in energy model and Template with
> reference?****
>
>  ****
>
> Thanks,****
>
> Ashraf Khan****
>
>
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