[Equest-users] fire station modeling

[Anthony Hardman]

I think the justification is attributable to the 24/7 occupancy as opposed
to traditional daytime only operated buildings.

Anthony Hardman, PE
The Green Engineer, LLP

-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Patrick J.
O'Leary, Jr.
Sent: Tuesday, November 09, 2010 6:51 AM
To: equest-users; bldg-sim-subscribe at onebuilding.org
Subject: [Equest-users] fire station modeling

has anyone received a comment on eac1 requiring the use of residential ptac
systems in the baseline building when modeling fire stations?  i have seen
the following comments on two fire station projects recently with no further
background material concerning the source of the residential determination
from the reviewers than the statements below.  
this, to me, is not what previous usgbc cirs, 90.1 (2004 or 2007), or 
the 90.1 user's manual say.   per 90.1 and the previous usgbc cirs the 
predominant use of the building, based on sf and number of stories,
determine what type of systems are used.  for a building less than
20,000 sf this is typically going to be packaged gas or heat pump units.

project 1 (leed v2.2 project)
"The Baseline system type modeled does not seem consistent with the system
mapping from Table G.3.1.1.A. Please note the GBCI has determined that Fire
Stations are considered residential for the purposes of completing EAc1
credit.  Please confirm that the Baseline system (and principle heating
source) was modeled correctly, or revise the system type to reflect ASHRAE
modeling protocol. Also, if any exceptions are utilized from G3.1.1 please
provide a explanation for the exception."

project 2 (leed v2.2 project)
"5. Table 1.4 indicates the Baseline Primary HVAC system as a type #3, which
does not appear to be consistent with the system mapping from Table
G.3.1.1.A. The sleeping quarters (residential) should be modeled as a system
type #1 and the non-residential areas as a type #3. Please provide a
narrative confirming that the Baseline model sleeping quarters have been
modeled using System #1, Constant Volume PTAC, with DX cooling, and Fossil
Fuel boiler. The narrative shall also include size of equipment modeled
within the Baseline model. Revise Baseline Unitary Equipment Cooling and
Boiler parameters to match Tables 6.8.1A and 6.8.1E of ASHRAE 90.1-2004 and
include Proposed Unitary Equipment Cooling and size of the boilers. Please
revise the Baseline and Proposed models, and update the Template, and
supporting documentation as required. Please confirm that the parameters
defined in section G3.1.3.2 through G3.1.2.5 have been modeled, and that the
mandatory requirements of Section 6.4 have been adhered to. Please add
sufficient information to Table 1.4 to confirm that the Baseline boiler
systems were modeled in accordance with these requirements"

the usgbc cir & 90.1 references:

1.  USGBC Advanced Energy Modeling for LEED (page 17) - Table 2.2, CIR dated
8/26/2008 and 4/23/2008. "Clarifies how to determine baseline HVAC
system(s) for building eligible for more than one system type."
-"CIR dated 8/26/2008 states that for projects with multiple uses in the
same building, predominant condition as determined by total floor area
should determine system type for entire building.  Ruling references note
following Table G3.1.1A in ASHRAE 90.1-2004:  Where attributes make a
building eligible for more than one baseline system type, use the
predominant condition to determine the system type for the entire building."
-"CIR dated 4/23/2008 confirms that when conditions do not vary per
exceptions to G3.1.1, project teams must use single baseline system type for
entire building.  HOwever, if project includes multiple detached buildings,
each building can use different system type; this is addressed in Chapter 4
of document."

2.  90.1-2004 Table G3.1.1A Note 3 - "Where attributes make a building
eligible for more than one baseline system type, use the predominant
condition to determine the system type for the entire building."

3.  90.1-2004 Section G3.1.1 Exception (a) - "Use additional system
type(s) for non-predominant conditions (i.e. residential/nonresidential or
heating source) if those conditions apply to more than 20,000 sf of
conditioned floor area." (Note the fire stations in the two projects with
the comments above are each less than 14,000 sf of conditioned floor area.)

4.  90.1-2004 User's Manual - "The scope of Standard 90.1, in terms of
residential spaces, applies just to spaces with four or more stories, so
low-rise residential is excluded."

regards,
patrick
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