Pretty good, Nick. Thanks for summarizing your understanding of Summary tabs. Sorry, it was a reach....<br><br><div class="gmail_quote">On Fri, Oct 8, 2010 at 9:55 AM, Nick Caton <span dir="ltr"><<a href="mailto:ncaton@smithboucher.com">ncaton@smithboucher.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">First, thanks to Carol for<b> elevating</b> my understanding of
elevation in eQuest (see what I did there??? it’s a Friday alright)…
</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">That was always a mystery to me and I’m finding elevation
is indeed the source of my CFM’s bumping up (not doubling though) on at
least one previous project.</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">That said, Paul: </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">I’m pretty sure you can expect any entered zone-level design
airflows (including exhaust) to potentially override or otherwise mess with system
level airflow inputs if/when they ever sum to be larger. </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">If you specify a system-level design airflow which is below what
the loads require but not in conflict with any zonal inputs, eQuest appears to
simply adjust upwards for elevation if >0, then upward to the limits of your
entered max-flow-ratio, then follows through and spits back unmet load hours in
the results, as you’d expect, but importantly will <u>not</u> inflate
your system’s design CFM beyond the max-flow ratio to compensate for
unmet loads – so it may be good to know whatever is doubling the specified
CFM in your model is probably not related to your load inputs. </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">Oh yeah, the system sizing ratio (found on the first tab opening
any airside system) will inflate your airflows too if it’s above 1.0 –
better check that.</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">Sidenote: The fasted way I know of to check resulting airflow
results is to be aware of the summary tab. After a calc, highlight a
system within (or the project at the top of) the component tree under air-side
HVAC and click the summary tab underneath the toolbars.</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">~Nick</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<div>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"><img src="cid:image002.jpg@01CB66D8.97E50990" alt="cid:489575314@22072009-0ABB" height="37" width="119"></span><b><span style="font-size: 11pt; color: rgb(45, 77, 94);"></span></b></p>
<p class="MsoNormal"><b><span style="font-size: 11pt; color: rgb(45, 77, 94);"> </span></b></p>
<p class="MsoNormal"><b><span style="font-size: 11pt; color: rgb(45, 77, 94);">NICK CATON, E.I.T.</span></b><b><span style="color: rgb(45, 77, 94);"></span></b></p>
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<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<div>
<div style="border-width: 1pt medium medium; border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;">
<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>
[mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Matthew
W. Higgins<br>
<b>Sent:</b> Friday, October 08, 2010 10:54 AM<br>
<b>To:</b> Paul Diglio; Carol Gardner; <a href="mailto:cstalberg@naturalintelligence.us" target="_blank">cstalberg@naturalintelligence.us</a><div><div></div><div class="h5"><br>
<b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] design flow input vs. SV-A supply flow
reporting</div></div></span></p>
</div>
</div><div><div></div><div class="h5">
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">Depending on your system type (VAV) I’ve found that you
need to ensure your Min and Max flow ratios are set at 1.0 for each system, if
appropriate. While the system sizing ratio is one thing, flow ratios are
another. </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">But maybe you’ve tried that already, I don’t
know…</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<div>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">Matthew Higgins, ASHRAE-HBDP, LEED-AP</span></p>
<p class="MsoNormal"><i><span style="font-size: 11pt; color: rgb(31, 73, 125);">Energy Engineer</span></i></p>
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<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<div>
<div style="border-width: 1pt medium medium; border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;">
<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>
[mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Paul
Diglio<br>
<b>Sent:</b> Friday, October 08, 2010 9:06 AM<br>
<b>To:</b> Carol Gardner; <a href="mailto:cstalberg@naturalintelligence.us" target="_blank">cstalberg@naturalintelligence.us</a><br>
<b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] design flow input vs. SV-A supply flow
reporting</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<div>
<p class="MsoNormal"><span style="font-size: 10pt;">Carol:<br>
<br>
I am having the same problem with airflow almost double from what I
specified. I tried the altitude correction and that did not help.<br>
<br>
Does the zone air flow and exhaust rate take preference over the fan flow
parameters?<br>
<br>
Thank you,<br>
<br>
Paul Diglio</span></p>
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<p class="MsoNormal"><span style="font-size: 10pt;"> </span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size: 10pt;"> </span></p>
<div>
<div class="MsoNormal" style="text-align: center;" align="center"><span style="font-size: 10pt;">
<hr size="1" align="center" width="100%">
</span></div>
<p class="MsoNormal" style="margin-bottom: 12pt;"><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;"> Carol Gardner <<a href="mailto:cmg750@gmail.com" target="_blank">cmg750@gmail.com</a>><br>
<b>To:</b> <a href="mailto:cstalberg@naturalintelligence.us" target="_blank">cstalberg@naturalintelligence.us</a><br>
<b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Sent:</b> Fri, October 8, 2010 9:33:46 AM<br>
<b>Subject:</b> Re: [Equest-users] design flow input vs. SV-A supply flow
reporting<br>
</span><br>
Not stupid at all, If you have your altitude set to anything but 0 eQUEST will
adjust your cfm accordingly. I always go in and set it manually to zero. I
think it reads what it is off the weather file.<br>
<br>
Carol</p>
<div>
<p class="MsoNormal">On Fri, Oct 8, 2010 at 6:54 AM, Christian Stalberg <<a href="mailto:cstalberg@naturalintelligence.us" target="_blank">cstalberg@naturalintelligence.us</a>>
wrote:</p>
<div>
<p class="MsoNormal"><span style="font-size: 10pt; color: blue;">They say no question is a stupid question.</span></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="font-size: 10pt; color: blue;">Why is my zone level supply flow cfm reported value in the SV-A
report </span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: blue;">higher than my overall design flow (ASSIGNED-FLOW) value? The </span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: blue;">system sizing ratio is set at 1.00 (default).</span></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="font-size: 10pt; color: blue;">Thanks in advance.</span></p>
</div>
<p class="MsoNormal" style="margin-bottom: 12pt;"><br>
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<p class="MsoNormal"><br>
<br clear="all">
<br>
-- <br>
Carol Gardner PE</p>
</div>
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</div></div></div>
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</blockquote></div><br><br clear="all"><br>-- <br>Carol Gardner PE<br>
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