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is this a leed 2.2 or 3.0 project?<br>
<br>
i'm guessing, without looking in my leed manuals, this is a usgbc
requirement for at least 2.2. for leed 3, 90.1-2007, appendix g,
table 3.1, no. 4 schedules, specifically states the "hvac fans that
provide outdoor air for ventilation shall run continuously whenever
spaces are occupied and shall be cycled on and off to meet heating
and cooling loads during unoccupied hours." 90.1-2004 doesn't
specify fans specifically for outdoor air for ventilation, it just
says hvac fans - which is the same as the system supply fan in a
non-doas/economizer capable of completely closing the outdoor air
damper system so the outdoor air can't be shut off.<br>
<br>
so the comment is contrary to the 90.1-2007 (and/or 2004 depending
on systems) simulation requirement. the 90.1-2004 user's manual
appendix g section doesn't address the scheduling for hvac fans
during unoccupied modes.<br>
<br>
On 4/24/12 9:54 AM, R B wrote:
<blockquote
cite="mid:CA+f4ixB=+93uKHueFVF5_bwkRBd2hJn9QYC=6drAgyE-RAA0Rw@mail.gmail.com"
type="cite">
<div class="gmail_extra">I normally have a min sch specified at
the zone level - 0 for unoccupied hours and -999 for other hours
that takes care of this comment.</div>
<div class="gmail_extra">There is an hourly report for fan coming
on during night cycle flag (or something similar). If you do not
have the fan coming on or do not have the night cycle control,
you should be ok. You can also look at the hourly report for OA
ratio and whether fan is on/off during the unoccupied time.</div>
<div class="gmail_extra">-Rohini</div>
<div class="gmail_extra"><br>
<br>
</div>
<div class="gmail_quote">On Tue, Apr 24, 2012 at 11:23 AM, Ramana
Koti <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:ramana.koti@gmail.com" target="_blank">ramana.koti@gmail.com</a>></span>
wrote:<br>
<blockquote style="margin:0px 0px 0px
0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid"
class="gmail_quote">
<div>Dear All,</div>
<div> </div>
<div>One of the LEED review comments on a university building
project I'm working on suggests to verify that all systems
in baseline and proposed models contain zero outside air
flow when fans are cycled on to meet setback temperatures
during unoccupied hours. </div>
<div> </div>
<div>What is the best way to go about verifying this? In the
'Hourly Report Block' options under a system, I find 'Hourly
summed zone OA CFM for DCV calculation (cfm)' and 'Hourly
max zone OA/total flow for DCV calculation (cfm/cf/). Is one
or both of these options under an hourly report, the way to
go or is there a better way of doing it?</div>
<div> </div>
<div>Thanks,</div>
<div>Ramana.</div>
<br>
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<div class="gmail_extra"><br>
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