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<div class=Section1>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>FYI a new CIR has been posted on the USGBC
web site regarding natural ventilation systems and LEED projects.<span
style='mso-spacerun:yes'> </span>The text is below.<span
style='mso-spacerun:yes'> </span>Please consider this just a starting
point and general guidance for projects that are similar to the one
described.<span style='mso-spacerun:yes'> </span>We welcome feedback.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width="100%"
style='width:100.0%;mso-cellspacing:0in;mso-padding-alt:0in 0in 0in 0in'>
<tr style='mso-yfti-irow:0;mso-yfti-firstrow:yes'>
<td width="15%" valign=top style='width:15.0%;padding:0in 0in 0in 0in'>
<p class=MsoNormal style='line-height:7.65pt'><b><font size=1 color="#474440"
face="Trebuchet MS"><span style='font-size:5.5pt;font-family:"Trebuchet MS";
color:#474440;font-weight:bold'>3/22/2007</span> - </span></font></b><font
size=1 color="#474440" face="Trebuchet MS"><span style='font-size:5.5pt;
font-family:"Trebuchet MS";color:#474440'><o:p></o:p></span></font></p>
</td>
<td valign=top style='padding:0in 0in 0in 0in'>
<p class=MsoNormal style='line-height:7.65pt'><b><font size=1 color="#474440"
face="Trebuchet MS"><span style='font-size:5.5pt;font-family:"Trebuchet MS";
color:#474440;font-weight:bold'>Credit Interpretation Request</span></font></b><font
size=1 color="#474440" face="Trebuchet MS"><span style='font-size:5.5pt;
font-family:"Trebuchet MS";color:#474440'><br>
<span id="dlCreditInterpretations__ctl1_lblQuestion">Our project consists of
two small buildings close to the ocean that will achieve substantial energy
savings by incorporating a natural ventilation strategy. No mechanical
heating or cooling is intended for either building, with the exception of a
small electrical/server room. <br>
<br>
The building is designed with a very narrow and long floor plate situated
perpendicular to prevailing winds in the area. Ventilation openings are
consistent with the requirements of ASHRAE 62.1-2004 Section 6.8. The project
also meets the requirements outlined in the CIBSE Applications Manual 10:
2005 as referenced in EQc2 for Natural ventilation in non-domestic buildings.
Per Title-24 2005 requirements for natural ventilation, the sum of operable
windows will be greater than 5% of the floor area of each space that is
naturally ventilated. The openings will also be readily accessible to the occupants
of each space at all times. Outdoor airflow through the openings in regularly
occupied spaces will come directly from the outdoors, not through
intermediate spaces such as other occupied spaces or corridors. Openings
include operable windows, through-the roof ventilators, and vents between
interior spaces. Control mechanisms for the natural ventilation openings are
manual. A long, tall hallway situated perpendicular to the prevailing winds
will collect heated air and exhaust it the outside. The roof over much of the
space is sloped allowing air to enter on the low side and exit on the high
side. In all cases, the building is designed to facilitate cross-ventilation
with windows low on the walls for drawing the air in, and windows and vents
high in opposite walls or on the roof to draw air out. Under ASHRAE 55
definitions, the building spaces are defined as "naturally conditioned
spaces, occupant controlled" where the thermal conditions of the spaces
are regulated primarily by the opening and closing of windows or vents by the
occupants. Since the building will have a limited number of occupants most of
the time, manual control of the windows and vents has been determined the
most appropriate strategy for the building to allow control over individual thermal
comfort. As indicated by ASHRAE 55-2004, section 5.3, the occupants of the
space will be engaged in near sedentary activities with metabolic rates
ranging from 1.0 met to 1.3 met. The mean monthly outdoor temperature for the
project is greater than 50 deg. <span class=GramE>F,</span> and less than
92.3 deg. F all months of the year, as required under ASHRAE 55-2004, section
5.3 for naturally ventilated buildings. <br>
<br>
The User's Manual for ASHRAE 90.1-2004 Appendix G states on page G-21: The
proposed building default cooling system does not exclude natural ventilation
from consideration. It just means that the proposed building is modeled as a
hybrid system where cooling is provided by natural ventilation when
conditions are acceptable and by the default mechanical cooling system when
natural ventilation is inadequate to provide thermal comfort. We are
requesting confirmation that the following modeling strategy conforms to the
requirements of ASHRAE 90.1-2004 Appendix G modeling protocol:<br>
<br>
1. EnergyPlus will be used to model the building since the EnergyPlus
software has the capability to evaluate energy and comfort parameters tied to
natural ventilation.<br>
<br>
2. The Exceptional Calculation Methodology will be applied to calculate the
natural ventilation savings.<br>
<br>
3. The Proposed Design model will be developed to reflect the design
parameters for the envelope and lighting. Operable windows will be modeled as
fixed, and vents will not be included in the model. Mechanical systems will
be modeled identically to the default heating, cooling and fan systems in the
Baseline case, except that fans in the proposed case will be modeled as
cycling on and off to meet heating and cooling loads during all hours in the
proposed case, and will operate continuously during occupied hours in the
Baseline Case (per the exception shown in Table G3.1.4).<br>
<br>
4. Using the Exceptional Calculation Methodology, The Proposed Design case
will be modified to include natural ventilation for all hours when the
cooling and heating loads can be met. Operable windows and vents will be
modeled as designed. Cooling and heating setpoint temperatures will be
identical to those in the Baseline Case. Schedules will be adjusted to switch
on mechanical cooling during hours when natural ventilation alone cannot meet
the space temperature setpoints. The final model will meet the ASHRAE
G3.1.2.2 requirements stipulating that the Proposed Design cannot exceed the
Baseline Design unmet load hours by more than 50, and that unmet load hours
for the Proposed Design and Baseline Design cannot exceed 300. <br>
<br>
5. (Plan B) If the hybrid system cannot be manipulated to meet the unmet load
hour requirements within the energy model, hourly output data from a natural
ventilation model (having no mechanical cooling) and the Proposed Design
model will be combined in a spreadsheet. Each hour where cooling and heating
setpoints are met in the natural ventilation model, the hourly results for
that model will be used. For all other hours, the hourly results from the
Proposed Design Model will be used.<br>
<br>
6. An Exceptional Calculation Methodology narrative provided with the EAc1
submittal will document any schedule adjustments and assumptions that were
made to develop the hybrid system. The savings will also be included as a
separate line item on the EAc1 submittal.<br>
<br>
Is our proposed energy modeling strategy for natural ventilation acceptable?</span><o:p></o:p></span></font></p>
</td>
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<td style='padding:0in 0in 0in 0in'>
<p class=MsoNormal style='line-height:7.65pt'><font size=1 color="#474440"
face="Trebuchet MS"><span style='font-size:5.5pt;font-family:"Trebuchet MS";
color:#474440'> <o:p></o:p></span></font></p>
</td>
<td style='padding:0in 0in 0in 0in'>
<p class=MsoNormal><font size=2 face="Times New Roman"><span
style='font-size:10.0pt'><o:p> </o:p></span></font></p>
</td>
</tr>
<tr style='mso-yfti-irow:2;mso-yfti-lastrow:yes'>
<td width="15%" valign=top style='width:15.0%;padding:0in 0in 0in 0in'>
<p class=MsoNormal style='line-height:7.65pt'><b><span
id="dlCreditInterpretations__ctl1_lblAnswerDate"><font size=1 color="#474440"
face="Trebuchet MS"><span style='font-size:5.5pt;font-family:"Trebuchet MS";
color:#474440;font-weight:bold'>3/22/2007</span> - </span></font></b><font
size=1 color="#474440" face="Trebuchet MS"><span style='font-size:5.5pt;
font-family:"Trebuchet MS";color:#474440'><o:p></o:p></span></font></p>
</td>
<td valign=top style='padding:0in 0in 0in 0in'>
<p class=MsoNormal style='line-height:7.65pt'><b><font size=1 color="#474440"
face="Trebuchet MS"><span style='font-size:5.5pt;font-family:"Trebuchet MS";
color:#474440;font-weight:bold'>Ruling</span></font></b><font size=1
color="#474440" face="Trebuchet MS"><span style='font-size:5.5pt;font-family:
"Trebuchet MS";color:#474440'><br>
<span id="dlCreditInterpretations__ctl1_lblAnswer">The project is requesting
approval for the method of modeling natural ventilation as an energy
efficiency measure and for taking credit under EA credit 1. <br>
<br>
Submittals for natural ventilation savings will be evaluated on a case by
case basis. <br>
<br>
The tools and analysis protocol proposed is acceptable for modeling
ventilation savings in this instance. Other analysis tools may also be
appropriate.<br>
<br>
To be able to adequately document the process and the results, please be sure
to provide in the LEED submittal the following: <br>
<br>
· A detailed project description <br>
· Clear identification of the areas that are taking credit for natural
ventilation<br>
· A detailed description or references that document the modeling
algorithms and/or methodology for the natural ventilation portion of the
energy model<br>
· All thermostat, fan, infiltration and other appropriate schedules
for naturally ventilated areas<br>
<br>
Also, the submitted evaluation must demonstrate that the range of unmet load
hours is similar for both the proposed and baseline building, to ensure that
savings are not claimed for hours outside of the control parameters. In this
case, the project has proposed to meet these peak loads with a hypothetical
cooling system in the proposed building.<br>
<br>
The project will also need to clearly demonstrate that the operational
schedule for the natural ventilation system as modeled aligns with
anticipated occupant behavior in terms of scheduled occupancy vs. modeled
operation. For example, the model cannot assume that natural ventilation will
occur when no one is in the building to operate the system.<br>
<br>
Because manual control is not addressed by the Appendix G modeling
methodology, the manual control features of this project must be submitted
under the exceptional calculation methodology for case by case review. The
project must be prepared to demonstrate convincingly that a manual control
strategy is appropriate and workable for this project.<br>
<br>
Please also be sure to take credit for this measure as a separate item on the
LEED-NC v2.2 Submittal Template.<br style='mso-special-character:line-break'>
<![if !supportLineBreakNewLine]><br style='mso-special-character:line-break'>
<![endif]><o:p></o:p></span></font></p>
</td>
</tr>
</span>
</table>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color=green face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:green;mso-no-proof:yes'>Marcus Sheffer –
Vice Chair USGBC EA TAG</span></font><font color=navy><span style='color:navy;
mso-no-proof:yes'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=green face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:green;mso-no-proof:yes'>Energy Opportunities,
Inc/a 7group Company</span></font><font color=navy><span style='color:navy;
mso-no-proof:yes'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
7.5pt;font-family:Arial;color:navy;mso-no-proof:yes'>1200 E Camping <st1:address
w:st="on"><st1:Street w:st="on">Area Road</st1:Street>, <st1:City w:st="on">Wellsville</st1:City>,
<st1:State w:st="on">PA</st1:State> <st1:PostalCode w:st="on">17365</st1:PostalCode></st1:address></span></font><font
color=navy><span style='color:navy;mso-no-proof:yes'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
7.5pt;font-family:Arial;color:navy;mso-no-proof:yes'>717-292-2636, </span></font><font
color=navy><span style='color:navy;mso-no-proof:yes'><a
href="mailto:sheffer@sevengroup.com"><font size=1 face=Arial><span
style='font-size:7.5pt;font-family:Arial'>sheffer@sevengroup.com</span></font></a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
7.5pt;font-family:Arial;color:navy;mso-no-proof:yes'><a
href="http://www.sevengroup.com">www.sevengroup.com</a></span></font><font
color=navy><span style='color:navy;mso-no-proof:yes'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy;mso-no-proof:yes'> </span></font><font
face=Arial><span style='font-family:Arial;mso-no-proof:yes'><o:p></o:p></span></font></p>
</div>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;mso-no-proof:yes'><o:p> </o:p></span></font></p>
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