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<p class=MsoNormal><span style='color:#1F497D'>Hi John,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Hmm… intuitively I think this
makes sense, but I haven’t actually gone through creating a set of custom packaged
DX curves before – lets’ first verify we’re looking at the same definition:<o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Volume
2: Dictionary<span class=d2hbreadcrumbslinkseparator> > </span>HVAC
Components<span class=d2hbreadcrumbslinkseparator> > </span>SYSTEM<span
class=d2hbreadcrumbslinkseparator> > </span>Cooling Equipment<span
class=d2hbreadcrumbslinkseparator> > </span>DX Cooling<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt;font-family:"Times New Roman","serif"'>COOL-EIR-FT<o:p></o:p></span></b></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'>Takes the U-name
of a bi-linear or bi-quadratic curve that describes the Electric Input Ratio
for cooling <u>as a function of entering wet-bulb temperature and outdoor
dry-bulb temperature (for direct expansion coils)</u> or entering wet-bulb
temperature and entering water temperature for a Water Loop Heat Pump (HP)
system. At ARI conditions, the value of the curve should be 1.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I’m pretty sure the entering
wet-bulb is that found entering the evaporator coil – the mixed air about to be
conditioned. If you check out a typical set of packaged DX unit performance
tables (If you want a specific example to follow along, I’ve just cracked open an
<a href="http://tech.lennoxintl.com/C03e7o14l/HS7CbNGGFw/ehb_lgh_abox_1010.pdf">engineering
guide for the Lennox LGH series</a>* to page 21), you’ll find they’ve got OA DB
along one axis (85/95/105/115) and Entering WB along the other axis
(63/67/71). It would appear the same tables could also be used to reference
data for COOL-CAP-FT and COOL-SH-CAP curves.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Make sense now?<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>~Nick<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>*Disclaimer: I have no particular
ties or intent/business to advocate Lennox over their competitors – all of
their major competitors publish similar reference/sizing tables, and this
particular unit’s guide just happened to be near the top of my reference stack.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='color:#1F497D'><img border=0 width=119
height=37 id="Picture_x0020_1" src="cid:image001.jpg@01CBB7FA.CA2EE8D0"
alt="cid:489575314@22072009-0ABB"></span><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-size:12.0pt;
font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:7.5pt;color:#CC9900'>PROJECT ENGINEER<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>Smith &
Boucher Engineers</span><span style='font-size:7.5pt;font-family:"Times New Roman","serif";
color:#CC9900'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>25501 west
valley parkway<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>olathe ks 66061<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>direct 913
344.0036<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>fax 913
345.0617<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><a href="www.smithboucher.com"
title="blocked::www.smithboucher.com"><span style='font-size:10.0pt'>www.smithboucher.com</span></a></span><u><span
style='font-size:10.0pt;color:blue'> </span></u><span style='color:#1F497D'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<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"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>John T.
Forester<br>
<b>Sent:</b> Wednesday, January 19, 2011 4:50 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Air-Cooled EIR Curves<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Quick question,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>When creating custom EIR fT and EIR fPLR curves for
air-cooled packaged DX units with digital scroll compressors, what are the two
independent variables? The DOE2 help says to use entering wet-bulb and
outside air dry-bulb. Where is the entering wet-bulb temperature
measured? Intuitively, this doesn’t seem correct to me.<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><o:p> </o:p></p>
<p class=MsoNormal>John<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:gray'>John T. Forester, P.E., LEED AP, Mechanical Design Engineer </span><b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#0000A0'>I BVH
Integrated Services I</span></b><b><span style='font-size:10.0pt;font-family:
"Arial","sans-serif";color:black'> </span></b><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:gray'>617.658.9008 tel </span><b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#0000A0'>I</span></b><b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:gray'> </span></b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:gray'>617.244.3753
fax</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#0000A0'> <b>I</b></span><b><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:gray'> </span></b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:gray'>One Gateway
Center Suite 506, Newton MA 02458 </span><b><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:#0000A0'>I <a href="http://www.bvhis.com">www.bvhis.com</a> I
Hartford ● New Haven ● Boston</span></b><span style='font-size:10.0pt'><o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
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