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You can certainly reference COOLING-CAPACITY for a SYSTEM component
within a user-defined expression that populates COOLING-EIR for the
same component. All such references are classified as "local".
However, if COOLING-CAPACITY may not be defined then your expression
would have to accommodate that (by checking for its validity) and
you would likely have to set the return COOLING-EIR to something
like "undefined" in that event that it is invalid.<br>
If you would like this to work they way you have described it (via
expressionized inputs), you might try something along these lines:<br>
- install temporary/placeholder EIRs<br>
- perform a "sizing" run on your model<br>
- install cooling capacities (and perhaps air flows) based on the
sizing run results<br>
- then plug in your COOLING-EIR expressions (that depend on
COOLING-CAPACITY)<br>
If subsequent changes in your model cause you have to change one or
more COOLING-CAPACITY inputs, then your expressions defined for
COOLING-EIR should adjust accordingly.<br>
<br>
- Scott<br>
<br>
<br>
On 5/18/2011 8:37 AM, Jeremy Poling wrote:
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<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">That
was the only problem in my mind – I figured a try and see
approach would get to the bottom of it. Scott is probably
much more familiar with this than I am, but there are no
problems referencing local keywords under the same parent
from what I have seen. You can setup a function that
defines the WIDTH keyword of a window as a function of the
HEIGHT keyword of the same window without a problem. The
issue I was worried about (and you are as well) would be
using a local keyword as a reference when that keyword is
determined by the program and not explicitly defined in the
input file. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">It
would probably take me at least a few hours of playing
around with it to figure out if I can even reference the
COOLING-CAPACITY keyword under the COOLING-EIR. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><b><span style="font-size: 7.5pt;
font-family: "Verdana","sans-serif";
color: rgb(31, 73, 125);">Jeremy R. Poling, PE, LEED
AP+BDC</span></b><span style="color: rgb(31, 73, 125);"><br>
</span><span style="color: rgb(31, 73, 125);"> <o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<div>
<div style="border-right: medium none; 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;
font-family:
"Tahoma","sans-serif";">From:</span></b><span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif";"> Bishop,
Bill [<a class="moz-txt-link-freetext" href="mailto:wbishop@pathfinder-ea.com">mailto:wbishop@pathfinder-ea.com</a>] <br>
<b>Sent:</b> Wednesday, May 18, 2011 8:52 AM<br>
<b>To:</b> Jeremy Poling; Dahlstrom, Aaron;
<a class="moz-txt-link-abbreviated" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Cc:</b> Scott Criswell<br>
<b>Subject:</b> RE: [Equest-users] Appendix G Baseline
Systems 1 and 2 efficiency<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Jeremy,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Can
a child component (COOLING-EIR) reference the keyword value
of another child component (COOLING-CAPACITY) of the same
parent?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">In
the case I’m describing, there is no keyword value for
COOLING-CAPACITY, since it is calculated by the program, not
entered. Is there any way to reference program output with a
user input function?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Bill<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<div>
<div style="border-right: medium none; 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;
font-family:
"Tahoma","sans-serif";">From:</span></b><span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif";"> Jeremy
Poling [<a class="moz-txt-link-freetext" href="mailto:Jeremy.Poling@transwestern.net">mailto:Jeremy.Poling@transwestern.net</a>] <br>
<b>Sent:</b> Tuesday, May 17, 2011 11:52 PM<br>
<b>To:</b> Dahlstrom, Aaron; Bishop, Bill;
<a class="moz-txt-link-abbreviated" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> RE: [Equest-users] Appendix G Baseline
Systems 1 and 2 efficiency<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div id="idOWAReplyText54174">
<div>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Arial","sans-serif";
color: black;">Have you thought about using a "user
input function" to define the EIR? I haven't used one
this way yet, but there are a few examples out there in
the help info. In theory, you could setup a logic
statement that checks the capacity and uses the EIR
value appropriate for that size system. I'd be willing
to discuss the idea with you guys, but there'll be a
certain amount of "if at first you don't succeed..."
involved to figure out the right code to grab the system
capacity.</span><span style="font-size: 12pt;
font-family: "Times New
Roman","serif";"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size: 12pt;
font-family: "Times New
Roman","serif";"> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Arial","sans-serif";">I've
been playing more with user input functions after seeing
some examples of powerful ways they can remove some of
the repetitive changes. For example, for single-zone
systems, you could theoretically program eQuest to
auto-calculate the OA based on ASHRAE 62.1 requirements
and the zone area and population. You could probably do
it for multi-zone systems also, but that gets into the
complexity level of the ASHRAE 62.1 spreadsheet and it
is probably less time to just do the calcs in the
spreadsheet and input the results.</span><span
style="font-size: 12pt; font-family: "Times New
Roman","serif";"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size: 12pt;
font-family: "Times New
Roman","serif";"> <o:p></o:p></span></p>
</div>
</div>
<div id="idSignature77069">
<div>
<div>
<div>
<p class="MsoNormal"><b><span style="font-size: 7.5pt;
font-family:
"Verdana","sans-serif"; color:
black;">Jeremy R. Poling, PE, LEED AP+BDC</span></b><span
style="color: black;"><o:p></o:p></span></p>
</div>
</div>
</div>
</div>
<div>
<p class="MsoNormal"><span style="font-size: 12pt;
font-family: "Times New
Roman","serif";"><o:p> </o:p></span></p>
<div class="MsoNormal" style="text-align: center;"
align="center"><span style="font-size: 12pt; font-family:
"Times New Roman","serif";">
<hr width="100%" align="center" size="2"></span></div>
<p class="MsoNormal" style="margin-bottom: 12pt;"><b><span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif";">From:</span></b><span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif";">
<a class="moz-txt-link-abbreviated" href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> on behalf of
Dahlstrom, Aaron<br>
<b>Sent:</b> Tue 5/17/2011 10:31 PM<br>
<b>To:</b> Bishop, Bill;
<a class="moz-txt-link-abbreviated" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] Appendix G Baseline
Systems 1 and 2 efficiency</span><span style="font-size:
12pt; font-family: "Times New
Roman","serif";"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size: 12pt;">Bill:</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="font-size: 12pt;">Your
procedure sounds very similar to ours.</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="font-size: 12pt;">Beyond the
simple automation of a spreadsheet, and dual monitors to
copy data from SIM to XLS quickly, we haven’t found any
quicker ways to skin this cat.</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<div>
<p class="MsoNormal" style="line-height: 150%;"><b><span
style="font-size: 9pt; line-height: 150%; font-family:
"Verdana","sans-serif"; color:
gray;">Aaron Dahlstrom , PE, LEED® AP</span></b><o:p></o:p></p>
<p class="MsoNormal" style="line-height: 150%;"><b><span
style="font-family: "AvantGarde Bk BT";
color: rgb(23, 54, 93);">In P</span></b><b><span
style="font-family: "AvantGarde Bk BT";
color: rgb(97, 148, 40);">o</span></b><b><span
style="font-family: "AvantGarde Bk BT";
color: rgb(23, 54, 93);">sse</span></b><span
style="font-size: 9pt; line-height: 150%; font-family:
"Verdana","sans-serif"; color:
gray;"> – </span><span style="font-size: 8pt;
line-height: 150%; font-family:
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"Verdana","sans-serif"; color:
gray;">| 1500 Walnut Street, Suite 1414, Philadelphia,
PA 19102 </span><o:p></o:p></p>
<p class="MsoNormal" style="line-height: 150%;"><span
style="font-size: 9pt; line-height: 150%; font-family:
"Verdana","sans-serif"; color:
gray;">d: 215-282-6753| m: 267-507-5470| In Posse:
215-282-6800| AKF: 215-735-7290</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size: 9pt;
font-family: "Verdana","sans-serif";
color: gray;">e: <a class="moz-txt-link-abbreviated" href="mailto:ADahlstrom@in-posse.com">ADahlstrom@in-posse.com</a> | in posse web:
<a moz-do-not-send="true"
href="http://www.in-posse.com/">www.in-posse.com</a> |
akf web: <a moz-do-not-send="true"
href="http://www.akfgroup.com/">www.akfgroup.com</a></span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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</div>
<p class="MsoNormal"> <o:p></o:p></p>
<div>
<div style="border-right: medium none; border-width: 1pt
medium medium; border-style: solid none none;
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-moz-use-text-color; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><span style="font-size: 10pt;
font-family:
"Tahoma","sans-serif";">From:</span></b><span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif";">
<a class="moz-txt-link-abbreviated" href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>
[<a class="moz-txt-link-freetext" href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On
Behalf Of </b>Bishop, Bill<br>
<b>Sent:</b> Tuesday, May 17, 2011 3:43 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Appendix G Baseline
Systems 1 and 2 efficiency</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Appendix G Baseline Systems 1 (PTAC) and
2 (PTHP) have cooling efficiencies (and for PTHP, heating
efficiencies) that vary with cooling capacity per Table
6.8.1D. Since each thermal block is modeled with its own
system, you can end up modeling as many as 100 or more
systems per project. For LEED projects (or other App. G
models), I have been calculating and manually entering
values for cooling EIR for every single system, based on
capacities reported in the SV-A reports. I factor in the
unique fan power (per G3.1.2.9) for each system and remove
its contribution from the efficiency, since fan power is
included in EER and needs to be separated per G3.1.2.1. Once
you enter efficiency for each system, just about any change
you make in the model changes the supply flow rate and/or
system capacities, which means you need to redo all the
efficiency calculations.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Does this method seem correct?<o:p></o:p></p>
<p class="MsoNormal">Has anyone figured out a way to automate
this process? (And by “automate”, I don’t mean give it to
the intern.)<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Bill<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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