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

[Ashraf Khan]

Exceptional calculations performed for Residential building, LEED NC V2.2.
Interior lighting calculations performed based on the CIR dated on
3/23/2007.

 

As CIR states that all hard-wired lighting in living units that is shown on
the building plans should be modeled identically in the Baseline and
Proposed building simulations as shown in the plans. This lighting shall be
considered process energy. Also it states that credit can be taken for an
efficient lighting design in the living unit using the Exceptional
Calculations Methodology. It suggests the figures schedule near 2 hours a
day or less for hard-wired residential fixtures. 

 

For an example in Bedroom baseline calculated as 2 W/sqft with occupancy of
2 hours a day and for propose case 1 W/sqft with same 2 hours a days. A
similar calculation has performed for entire building and I achieved 40%
savings in wattages.

 

Then reduction of wattage we are showing in Section 1.7 - Exceptional
Calculation Measure Summary. So leed reviewer is requesting to provide
heating impact on cooling and shown the calculations with zone wise and to
incorporate in energy model and Template.

 

Regards,

Ashraf

 

  _____  

From: Cheney [mailto:chenyu73 at gmail.com] 
Sent: Wednesday, October 05, 2011 8:59 PM
To: Nick Caton
Cc: Ashraf Khan; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] LEED EAC1 Exceptional calcs - heating consumption

 

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>
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

 

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

 <http://www.smithboucher.com> 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

 <http://www.smithboucher.com> 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


_______________________________________________
Bldg-sim mailing list
http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org
To unsubscribe from this mailing list send  a blank message to
BLDG-SIM-UNSUBSCRIBE at ONEBUILDING.ORG

 

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20111006/8245bba9/attachment-0002.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 1459 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20111006/8245bba9/attachment-0002.jpeg>