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

Kevin Kyte KKyte at watts-ae.com
Thu Jan 8 12:52:14 PST 2015

Hi Nick, I see what you mean.  Essentially, the first paragraph of my post is the Review Comment.  Everything after is my rant.  I do not believe that a heating only space would automatically qualify for exception to G3.1.1 in ASHRAE 90.1-2004.  The post was only to verify that there was no other criteria for selecting baseline system types for heating only spaces in ASHRAE 90.1-2004 other than the baseline system type tables.

Yes, my response was to clarify compliance with 2004 and I did leave out reference to 2010.


From: Nicholas Caton [mailto:ncaton at catonenergy.com]
Sent: Thursday, January 08, 2015 2:43 PM
To: Kevin Kyte; bldg-sim at lists.onebuilding.org
Cc: bldg-rate at lists.onebuilding.org
Subject: RE: [Bldg-sim] LEED Review Comment: Spaces served by Unit Heaters


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):   www.gbci.org/ContactUs<http://www.gbci.org/ContactUs>

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<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<mailto:bldg-sim at lists.onebuilding.org>
Cc: 'bldg-rate at lists.onebuilding.org<mailto: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 versions?

Thank you.
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