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

[Dahlstrom, Aaron]

Ashraf - just to close the loop - Nick and I had some off list discussion. We agreed to an edit to his procedure, which I've added in red below.

Aaron Dahlstrom , PE, LEED(r) AP
In Posse - A subsidiary of AKF| 1500 Walnut Street, Suite 1414, Philadelphia, PA 19102
d: 215-282-6753| m: 267-507-5470| In Posse: 215-282-6800| AKF: 215-735-7290
e: ADahlstrom at in-posse.com | in posse web: www.in-posse.com<http://www.in-posse.com/> | akf web: www.akfgroup.com<http://www.akfgroup.com/>



From: Nick Caton [mailto:ncaton at smithboucher.com]<mailto:[mailto:ncaton at smithboucher.com]>
Sent: Thursday, October 06, 2011 1:44 PM
To: Dahlstrom, Aaron; Ashraf Khan; Cheney
Cc: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: RE: [Bldg-sim] LEED EAC1 Exceptional calcs - heating consumption

Whether the models already incorporate these loads in some fashion will determine whether you need to add or subtract to illustrate the point.

Aaron's suggestion should be fairly straightforward:

*         Save a copy of your proposed/baseline models as they are - you'll reference them later.

*         In a new separate case, modify your proposed case to include the variance you desire to the lighting loads. This will constitute your ECM, and your savings over your proposed case would be input into the template as the ECM savings. This will incorporate the models' predicted additional heating / reduced cooling required from your lighting loads.

*         Space equipment loads and lighting loads will by default reject wattage as sensible heat to the space and/or plenum in some fraction.  Modify if necessary.  Defining these as a lighting load would make inputs simpler if you desire to reject a percentage to plenum.

*         Since this tangent came up recently on another thread:  Note that treating lighting input wattages as a 100% sensible heat load is entirely appropriate for conventional lighting sources in a building.  Generally only a small fraction of input watts is converted into light energy in our visible spectrum.  Some (not most) LED solutions, green lasers and oddball stars in the sky are exceptions to the rule in strict terms of luminous efficacy, but even then it's a moot point unless you're largely directing your lights outside a window - it's all ultimately a heat load in your space.

*         These loads should have unique scheduling assigned to match your description/calculations

*         The baseline and proposed loads should differ in magnitude per your description/calculations

*         When done, your models will reflect the savings targeted, and these lights' effects on cooling/heating consumption.  The models figure out the heating/cooling impact stuff in the course of an ordinary simulation

*         When done, set up a few parametric runs in any one model: Use that "based on another file" parametric run option, and simply reference  your proposed/baseline models (.inp) with and without the added/re-defined loads.  A parametric run will result in reports that show all consumptions for all 4 iterations side-by-side.  Should be a perfect illustration to include with your response.

~Nick


[cid:image001.jpg at 01CC884C.011754A0]

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: Dahlstrom, Aaron [mailto:ADahlstrom at in-posse.com]<mailto:[mailto:ADahlstrom at in-posse.com]>
Sent: Thursday, October 06, 2011 11:55 AM
To: Ashraf Khan; 'Cheney'; Nick Caton
Cc: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: RE: [Bldg-sim] LEED EAC1 Exceptional calcs - heating consumption

Ashraf -

I believe it is acceptable for your "exceptional calculation" to actually be an additional energy model case.

I agree that you are taking the right approach with respect to the CIR mentioned.

Based on earlier correspondence I'm assuming you have provided adequate documentation assuring the reviewer that your selected lighting power reductions are justified.

Could you then incorporate these revised LPD numbers into an additional case of the proposed model, done to the side?

This would give you an "exceptional savings", incorporating lighting savings as well as potential cooling savings / heating increases...

Aaron Dahlstrom , PE, LEED(r) AP
In Posse - A subsidiary of AKF| 1500 Walnut Street, Suite 1414, Philadelphia, PA 19102
d: 215-282-6753| m: 267-507-5470| In Posse: 215-282-6800| AKF: 215-735-7290
e: ADahlstrom at in-posse.com<mailto:ADahlstrom at in-posse.com> | in posse web: www.in-posse.com<http://www.in-posse.com/> | akf web: www.akfgroup.com<http://www.akfgroup.com/>



From: bldg-sim-bounces at lists.onebuilding.org<mailto:bldg-sim-bounces at lists.onebuilding.org> [mailto:bldg-sim-bounces at lists.onebuilding.org]<mailto:[mailto:bldg-sim-bounces at lists.onebuilding.org]> On Behalf Of Ashraf Khan
Sent: Thursday, October 06, 2011 4:35 AM
To: 'Cheney'; 'Nick Caton'
Cc: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: Re: [Bldg-sim] LEED EAC1 Exceptional calcs - heating consumption

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]<mailto:[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<mailto: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

On Wed, Oct 5, 2011 at 9:30 AM, Nick Caton <ncaton at smithboucher.com<mailto: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:image001.jpg at 01CC884C.011754A0]

NICK CATON, P.E.
SENIOR ENGINEER

Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036<tel:913.344.0036>
fax 913.345.0617<tel:913.345.0617>
www.smithboucher.com<http://www.smithboucher.com>

From: Cheney [mailto:chenyu73 at gmail.com<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<mailto: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<mailto: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

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NICK CATON, P.E.
SENIOR ENGINEER

Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036<tel:913.344.0036>
fax 913.345.0617<tel: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> [mailto: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<mailto: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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