[Bldg-sim] Mass Stretch Code: TEDI calcs

Mon Aug 7 18:51:44 PDT 2023

Hi Madhav,

I believe there was enough inference to confirm it was option B, through
all the replies received on this.
In Canada, depending on different provinces/jurisdictions, we optionally or
mandatorily need to report TEDI for the project. The TEDI reporting however
is only for heating due to envelope and ventilation.

I would like to take the opportunity to introduce the concept of TEDI
optimization through parametric modeling, which we have started offering
for projects in Canada. I believe this can be very useful for every project
pursuing stringent TEDI targets, as the optimization feature on parallel
coordinates can potentially save a lot on capital costs.  In one of our
most recent small multi-unit residential projects admeasuring just a 20,000
sqft building, the targeted TEDI range was achievable through options that
differed by up to $175,000 in their capital costs, enabling the design team
to find out the most cost-optimized TEDI for the design (see attached
image). Note that our process is not algorithm based, but each unique
simulation is actually set up and run on IESVE to derive the results. I am
sure the process can save 10's to 100's of thousand dollars, depending on
the size of the projects.

We typically use our optimization process for whole building KPI
optimization (cap/op cost, % energy/GHG savings, ROI, etc) which includes
parametric modeling of all the predetermined energy-impacting design
variables like walls, roof, floor, window, WWR, infiltration, lighting,
HVAC, ERV. Each variable is attributed with its cost metric, to calculate
the absolute capital cost for each unique combination. More information can
be found in this quick 4 min video:
https://ecomatrix.io/product-tour/

Though full optimization projects are heavier on time and effort due to
accurate parametric modeling of HVAC systems, TEDI optimization is a more
simple form of optimization that can be produced with lower effort and
relatively quick turnarounds. I look forward to getting your (and the
experts on this list) feedback on this and would be very happy to answer
any questions as well.

Thanks,
Anup Rathi

>
> >>> Madhav Munshi <mmunshi at kohlerronan.com> 2023-07-28 9:41 AM >>>
> Thank you everyone for your responses. All of you confirmed that it is
> indeed Option B.
>
> The MA 2023 Commercial Stretch code document (linked here) has a table on
> the TEDI limits
>
> https://www.mass.gov/doc/225-cmr-2200-commercial-specialized-stretch-energy-code-redline-june-24-2022-0/download
>
>
> Based on this table, the TEDI for heating averages 2.5 kBtu/sf/year. From
> a site EUI perspective, it would mean that if this was a fossil fuel system
> the site EUI would be about 2.8 kBtu/sf/year and for an all-electric HP
> based system, the site EUI would be about 1.13 kBtu/sf/year or lower. And
> the models are expected to include envelope, infiltration, ventilation, and
> exhaust systems. It seems like envelope and infiltration loads are expected
> to be near 0. So, maybe its only ventilation and exhaust for heating loads.
>
> But even then, aren’t these targets super aggressive? Is there any
> documentation that shows that this is possible to achieve in a real-world
> scenario?
>
>
> *MADHAV MUNSHI* BEMP
> Senior Associate
> mmunshi at kohlerronan.com
>
> *KOHLER RONAN* | Consulting Engineers
> 171 Madison Avenue, New York, NY 10016
>
> *From:* Bldg-sim <bldg-sim-bounces at lists.onebuilding.org> *On Behalf Of *Niknam
> via Bldg-sim
> *Sent:* Friday, July 28, 2023 12:46 AM
> *To:* Maria Karpman <maria.karpman at karpmanconsulting.net>
> *Cc:* bldg-sim at lists.onebuilding.org
> *Subject:* Re: [Bldg-sim] Mass Stretch Code: TEDI calcs
>
> The purpose of TEDI is to push the developers to reduce the thermal demand
> (load) of the buildings to help the utilities meet the demands and lowering
> the green gas emissions for generating the electricity since MA is
> mandating the electrification by 2035.
> Sent from my iPhone
>
>
> On Jul 27, 2023, at 9:42 PM, Maria Karpman <
> maria.karpman at karpmanconsulting.net> wrote:
>
> 
> Option B is indeed the correct answer. The detailed energy modeling
> guidelines for the MA Stretch Energy Code are about to be published. Till
> they are out, I recommend checking out the version that was posted for
> the public comments
> <https://www.mass.gov/doc/updated-guidelines-for-tedi-and-ashrae-app-g-modeling/download>.
> Note that the modeling rules are quite different from Vancouver & Toronto
> versions.
>
> Thanks,
>
> Maria
>
> On Thu, Jul 27, 2023 at 7:07 PM Niknam via Bldg-sim <
> bldg-sim at lists.onebuilding.org> wrote:
>
> Hi,
>
> TEDI should be calculated based on the heating/cooling load of the
> building. You can find that info on SS-D report.
> Sent from my iPhone
>
>
> On Jul 27, 2023, at 6:59 PM, smartin--- via Bldg-sim <
> bldg-sim at lists.onebuilding.org> wrote:
>
> 
> Hi Madhav,
>
> TEDI is a metric for the building envelope and ventilation load
> performance. You can sum heating (ONLY) coil loads to determine the output.
> This is a clip from the guideline we use in Canada (BC) that explains it.
> M.F.Area is building area excluding unconditioned indoor parking area, but
> including all other partially and unconditioned areas. So yes, the answer
> is option B, excluding the cooling. It is not the peak (A) and does not
> include heating system efficiency (C).
>
> <image003.png>
>
> Shaun
>
> Shaun Martin, BEMP, LEED-BD&C
> Principal
> Shaun Martin Consulting
> smartin at shaunmartinconsulting.com
> +1-604-789-1095
>
>
>
>
> *From:* Bldg-sim <bldg-sim-bounces at lists.onebuilding.org> *On Behalf Of *Madhav
> Munshi via Bldg-sim
> *Sent:* Thursday, July 27, 2023 2:14 PM
> *To:* bldg-sim at lists.onebuilding.org
> *Subject:* [Bldg-sim] Mass Stretch Code: TEDI calcs
>
> Hi group,
>
> Hope everyone is doing well. We are working on a school building in MA and
> need to perform “TEDI” models. I’ve read through the documentation and am a
> little confused if it’s a load metric or an energy metric. The limits are
> expressed in kBtu/sf/year in the code language, but some of the supporting
> documentation about how to extract this from equest/IES/ energy plus makes
> me feel like it’s a load metric. It has to be one the three and it seems
> like its option B
>
>
>    1. Peak Heating and Cooling load per SF
>    2. Sum of annual heating and cooling loads (annual) per SF – without
>    efficiency accounting
>    3. Sum of annual heating and cooling energy per SF – with efficiency
>    accounting
>
>
>
> https://www.mass.gov/doc/updated-guidelines-for-tedi-and-ashrae-app-g-modeling/download
>
> Appreciate your responses!
>
> Thank you
>
> Madhav
>
> <image004.png> <https://kohlerronan.com/>
> *MADHAV MUNSHI* BEMP
> Senior Associate
> mmunshi at kohlerronan.com
>
> *KOHLER RONAN* | Consulting Engineers
> 171 Madison Avenue, New York, NY 10016
> 212.695.2422
>
> <image011.jpg> <http://kohlerronan.com/>
> <image012.png>
> <https://www.facebook.com/Kohler-Ronan-LLC-Consulting-Engineers-146070618769600/>
>
> <image013.png> <https://twitter.com/KohlerRonan>
>
> <image014.png>
> <https://www.linkedin.com/company/1672806?trk=hp-feed-company-name>
>
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>
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> --
>
> *Maria Karpman *LEED AP, BEMP, CEM
> ________________
> Karpman Consulting
> www.karpmanconsulting.net
> Phone 860.430.1909
>
>
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