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<p class=MsoNormal><span style='color:black'>Just remember input units divided
by same output units and you are set, for both EIR and HIR.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>COP and EER (or “typical”
units of kW/ton for chillers) are steady state terms, these would reflect the
performance at any point in time, and correlate to the EIR and HIR model inputs
if you are using the equipment selection point conditions. Just convert
units and take the reciprocal as necessary. EIR is the inverse of COP as
you mentioned.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>SEER (and IPLV/NPLV) represent
seasonal averages, ideally you will be calculating this with the model rather
than using it as an input. (It can be used as a QA check.) The
seasonal performance for your building probably won’t be identical to the
conditions used to generate that weighted equation, so the equipment selection
values would be best. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>Hopefully you can find a cut sheet
for the equipment somewhere to find the power and capacity values rather than
using the SEER. The correction equation you referenced is valid under
certain conditions – maybe your project is a match. I wouldn’t
use it to select between different packaged units, but it might be close enough
to compare a packaged unit with a chiller system. Depends why you are
simulating the project.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>Hope this helps!<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>David<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> BLDG-SIM@gard.com
[mailto:BLDG-SIM@gard.com] <b>On Behalf Of </b>Kevin Kyte<br>
<b>Sent:</b> Thursday, November 29, 2007 9:31 AM<br>
<b>To:</b> BLDG-SIM@gard.com<br>
<b>Subject:</b> [BLDG-SIM] equest - select eir & hir questions<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I need to be schooled in electric input ratio and heat input
ratio for all equipment types: Airside and waterside.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><i>Airside – packaged units</i>: Where does one
find a COP for a DX cooling unit? I have only seen SEER or EER.
Then I have seen this equation from archive files, <o:p></o:p></p>
<p class=MsoNormal>Cooling EIR = 0.941 * (1/(SEER/3.413)). Is this the
correct equation? It was taken from the link: <a
href="http://www.gard.com/ml/bldg-sim-archive/msg01626.html">http://www.gard.com/ml/bldg-sim-archive/msg01626.html</a>.<o:p></o:p></p>
<p class=MsoNormal>How about conversion of EER to SEER? I think I
understand HIR = btu input/btu output?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><i>Waterside – chillers</i>: chiller EIR = 1/
COP, I was also told EIR = chiller kW *3413 / capacity. Is this the same,
which is correct?<o:p></o:p></p>
<p class=MsoNormal>HIR = heat input/ cooling capacity. Isn’t COP
the Output / input? So wouldn’t HIR be 1/ COP then. This is quite
confusing and going nowhere for me, would someone please clarify.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt'>Kevin Kyte, </span><span
style='font-size:10.0pt'>LEED AP<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>Jr. Mechanical Engineer<o:p></o:p></span></p>
<p class=MsoNormal>RobsonWoese, Inc.<o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt'>T: 716-636-1800<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>F: 716-636-1856<o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre>==================<o:p></o:p></pre><pre>You received this e-mail because you are subscribed <o:p></o:p></pre><pre>to the BLDG-SIM@GARD.COM mailing list. To unsubscribe <o:p></o:p></pre><pre>from this mailing list send a blank message to <o:p></o:p></pre><pre>BLDG-SIM-UNSUBSCRIBE@GARD.COM<o:p></o:p></pre></div>
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