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The first comment seems like the reviewer isn't carefully reviewing the
submission. It is fairly simple to check the proposed sim file and
the Budget case sim file to see if each zone in the proposed case is
modelled as a single zone system in the Budget case. I have seen
this comment before and I am not sure what additional documentation the
review might want to make it "clearer".<br><br>
Comment 2: I always setup a spreadsheet showing my calculation of total
fan power for the proposed case and the Budget case. <br><br>
Comment 3: The 20°F differential is the difference between the room set
point and the supply air temperature. Re Autosizing supply air
flows: I always autosize the Baseline air flows based on the 20°F supply
air to room air temperature difference (G3.1.2.8). I set the heat
sizing ratio to 1.25 and the cool sizing ratio to 1.15 as per
G3.1.2.2. Never had a problem with this approach. I suppose
you could do a sizing run with those sizing ratios then explicitly enter
the resulting supply air flows, heating and cooling capacities but it
would amount to almost the same results. <br><br>
At 02:56 AM 4/1/2010, Ashraf Khan wrote:<br>
<blockquote type=cite class=cite cite=""><font size=2>Hello,<br>
<br>
I received some comments from USGBC regarding my project initial review,
in Credit EAC1 – Optimize Energy Performance. Please advise me how I can
solve below mentioned comments in the review submission,<br>
<ol>
<li>It is unclear whether one Baseline Constant Volume system was modeled
per thermal zone in the Baseline Case as required. Please verify that one
system was modeled per zone, and that the Baseline System efficiency for
each zone was modeled consistently with the capacity for the Baseline
System serving that zone. <i>(please guide me how to solve this
comment)</i></font>
</ol><font size=2>
<ol>
<li>Section G3.1.2.9 describes calculation used to determine the fan
power in the baseline building. Please list the total fan volume,
capacities, and fan power for the Baseline and Proposed system. <i>(As my
system doesn’t have any Return fan, so i am dividing the ASHRAE total Fan
power by 70% supply, 20% return, 10% exhaust based on my understanding.
Please guide me if any changes required)</i></font>
</ol><font size=2>
<ol>
<li>Based on supporting document, supply fan volumes of some of the zones
in the baseline design appear to be modeled as “AUTOSIZED”. For the
baseline design the fan supply volumes should be calculated based on the
system capacity and a temperature differential of 20°F, as set forth in
Section G3.1.2.8.<i>(Please guide me Where can we enter the temperature
diff, is in Cooling Coil or any other ways.)</i>
</ol> <br>
Thanks & Regards,<br>
Khan<br>
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<br>
Chris Jones<br>
14 Oneida Avenue<br>
Toronto, ON M5J 2E3.<br>
Tel. 416-203-7465<br>
Fax. 416-946-1005<br><br>
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