[Bldg-sim] LEED Review Comment: Spaces served by Unit Heaters

Nicholas Caton ncaton at catonenergy.com
Thu Jan 8 11:42:54 PST 2015


The formatting below leaves me confused as to where the comment ends and
your response begins (and ends again?)…

If your models are in compliance with 90.1-2004, I think the core request
here is to clarify that’s the case.  Describe fully how the spaces in
question are handled in the Proposed and Baseline case, and cite the
specific passages and exceptions (if any) applied.  Evoking later editions
of 90.1 (specifically baseline systems 9 and/or 10) may unnecessarily
confuse the issue.

Along the way, you should probably clarify whether you are or are not
attempting to make the case for an exception under G3.1.1 (the text
preceding table G3.1), as that also seems to be up in the air.  If you are,
be sure to substantiate how the exception applies in your clarification.

If after all this, the particulars of your project leave you unsure of how
to apply 90.1-2004 for LEED v2.2 on this front, you may want to contact
GBCI directly with the details using their “contact us” form (wherein you
may request a phone call if it’s necessary to convey the full situation):

Hope that helps!



*Caton Energy Consulting*
  1150 N. 192nd St., #4-202

  Shoreline, WA 98133
  office:  785.410.3317


*From:* Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] *On Behalf
Of *Kevin Kyte
*Sent:* Wednesday, January 07, 2015 8:44 AM
*To:* bldg-sim at lists.onebuilding.org
*Cc:* 'bldg-rate at lists.onebuilding.org'
*Subject:* [Bldg-sim] LEED Review Comment: Spaces served by Unit Heaters

Sorry for the cross-postings.

3. It is unclear how the spaces served by unit heaters have been modeled in
the Baseline model. Provide a clarification narrative on the modeling
methodology with regards to system sizing, fan power, and capacities.

It is unclear why this comment is stated for a project pursuing version
2.2.  A space served by a unit heater must be modeled with cooling
identical to its system modeled in baseline per ASHRAE 90.1-2004 Table
G3.1.10.d.  A unit heater is not acceptable criteria for exception to
G3.1.1.  Therefore if a building baseline HVAC system type is regarding as
VAV then spaces served by unit heaters must also have a VAV baseline HVAC
system type.

It is understood that ASHRAE 90.1-2010 contains an exception to Table
G3.1.10.d and that G3.1.1 contains exception e.  However, this should not
apply to V2.2.

Am I missing something again or is this a plug-in comment from later

Thank you.
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