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

[Nick Caton]

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

 

 

 

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
<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 <http://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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