[Bldg-sim] Mass Stretch Code: TEDI calcs

Fri Jul 28 07:41:47 PDT 2023

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

[cid:image001.png at 01D9C12C.FF671DD0]

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<mailto: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<mailto: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<mailto: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<mailto: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<mailto:smartin at shaunmartinconsulting.com>
+1-604-789-1095

From: Bldg-sim <bldg-sim-bounces at lists.onebuilding.org<mailto: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<mailto: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<mailto:mmunshi at kohlerronan.com>

KOHLER RONAN | Consulting Engineers
171 Madison Avenue, New York, NY 10016
212.695.2422

<image011.jpg><http://kohlerronan.com/>
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Maria Karpman LEED AP, BEMP, CEM

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