<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<font size="+1">I would think without the ability to heat or reheat
you aren't controlling your hu<font size="+1">midity to 50% RH in
the <font size="+1">New Orleans building.<br>
<font size="+1">Bruce Easterbrook P.Eng<br>
<font size="+1">Abode Engineering<br>
<br>
</font></font></font></font></font>
<div class="moz-cite-prefix">On 13/03/2013 04:42 PM, Z Smith wrote:<br>
</div>
<blockquote
cite="mid:66FE4ED8A3A23C4FBFFD51226EE1A4CF2D85AFA3@BL2PRD0611MB409.namprd06.prod.outlook.com"
type="cite">
<meta http-equiv="Content-Type" content="text/html;
charset=ISO-8859-1">
<meta name="Generator" content="Microsoft Word 14 (filtered
medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:"Franklin Gothic Demi";
panose-1:2 11 7 3 2 1 2 2 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
{mso-style-priority:99;
mso-style-link:"Balloon Text Char";
margin:0in;
margin-bottom:.0001pt;
font-size:8.0pt;
font-family:"Tahoma","sans-serif";}
p.emailquote, li.emailquote, div.emailquote
{mso-style-name:emailquote;
mso-margin-top-alt:auto;
margin-right:0in;
mso-margin-bottom-alt:auto;
margin-left:1.0pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
span.EmailStyle18
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle19
{mso-style-type:personal-reply;
font-family:"Arial","sans-serif";
color:black;
font-weight:normal;
font-style:normal;
text-decoration:none none;}
span.BalloonTextChar
{mso-style-name:"Balloon Text Char";
mso-style-priority:99;
mso-style-link:"Balloon Text";
font-family:"Tahoma","sans-serif";}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">In
eQuest, we were using the ’24 hours high use” setting
building operation schedule, which is that the building is
always occupied—so all 8760 hours. We also set the system
to “no economizer”.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal" style="text-autospace:none"><b><span
style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Z
Smith, AIA, LEED AP BD+C </span></b><span
style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">| Director
of Sustainability & Building Performance |<b> </b></span><b><span
style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#A9AA17">Eskew+Dumez+Ripple</span></b><span
style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">
| 365 Canal Street, Suite 3150 | New Orleans, LA 70130 |
504.561.8686 |<b> </b></span><span
style="font-size:8.0pt;font-family:"Franklin Gothic
Demi","sans-serif";color:#A9AA23"><a
moz-do-not-send="true"
href="http://www.eskewdumezripple.com/"><span
style="color:#A9AA23;text-decoration:none">eskewdumezripple.com</span></a><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:8.0pt;font-family:"Franklin Gothic
Demi","sans-serif";color:#A9AA23"><o:p> </o:p></span></p>
</div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><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"">
Hall, Brendan [<a class="moz-txt-link-freetext" href="mailto:BHall@karpinskieng.com">mailto:BHall@karpinskieng.com</a>]
<br>
<b>Sent:</b> Wednesday, March 13, 2013 3:40 PM<br>
<b>To:</b> Z Smith; <a class="moz-txt-link-abbreviated" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Cc:</b> Corey Squire<br>
<b>Subject:</b> RE: [Equest-users] Does eQuest properly
account for latent loads in infiltration &
ventilation?<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">One
note about using heating and cooling degree days for that
purpose is that ventilation air is usually locked out during
unoccupied times so the annual total would be much lower.
From a quick read of the paper you cited it seems that they
used all 8760 hours. You would need to isolate the occupied
hours when the economizer is not likely to be in use to get
a more accurate number.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Brendan
Hall<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";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"">
<a moz-do-not-send="true"
href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>
[<a moz-do-not-send="true"
href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Z Smith<br>
<b>Sent:</b> Wednesday, March 13, 2013 3:26 PM<br>
<b>To:</b> <a moz-do-not-send="true"
href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Cc:</b> Corey Squire<br>
<b>Subject:</b> [Equest-users] Does eQuest properly
account for latent loads in infiltration &
ventilation?<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New"">We are interested in using eQuest to evaluate
the impact of improved air-sealing or changed outdoor air
ventilation rates. Even with very simple test case
buildings and run-of-the-mill HVAC systems, we get results
that make it seem as if eQuest is not accounting for the
latent component of outdoor air brought into a building.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New"">We are using Lew Harriman et al.’s 1997 ASHRAE
Journal paper on the “Ventilation Load Index” as a reality
check.
<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New""><a moz-do-not-send="true"
href="http://masongrant.com/pdf_2008/Ventilation_Loads.pdf">http://masongrant.com/pdf_2008/Ventilation_Loads.pdf</a>
<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New"">The authors characterize the total load (latent
and sensible) for bringing 1 cfm continuously into the
building for a number of cities. It’s interesting to
consider two cities with comparable CDD but very different
latent loads for ventilation air:<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New"">New Orleans CDD=2776 VLI=12.3 [latent] +
1.8 [sensible] =14.1 ton-hrs/yr<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New"">Tucson CDD=3017 VLI= 1.5 [latent] +
3.0 [sensible] = 4.5 ton-hrs/yr<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New"">The VLI is the cumulative load to bring 1cfm
from whatever the hourly condition is in the TMY2 file to
75°F, 50% RH (65gr/lb). Its units are ton-hr/yr for
convenience, converted to annual kBtu by multiplying VLI
by12 kBtu/ton-h.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New"">So, for example, if we have a building with
2,000ft2 of floor area and a volume of 20,000ft3 with a
ventilation rate of 1ACH, outdoor air is being introduced
to the building at 20,000/60 = 333cfm. The annual cooling
& dehumidification load associated with this airflow
is 333 x 14.1 = 4,695 ton-hrs/yr in New Orleans and 1,383
ton-hrs/yr in Tucson. If, for simplicity, we assume the
air system brings this air to 75°F, 50% RH with a SEER of
13 kBtu/kWh in both cities, then the energy consumption
associated with 1ACH for this 2000ft2 building is 4,334
kWh in New Orleans and 1,383 kWh in Tucson. The impact on
building site EUI will be 7.4 kBtu/sf/yr in New Orleans
and 2.4 kBtu/sf/yr in Tucson – a difference of about
5kBtu/sf/yr. If one were to consider ventilating at
10ACH, then the impact would be 10x as large—74kBtu/sf/yr
in New Orleans vs 24 kBtu/sf/yr in Tucson—a difference of
~50 kBtu/sf/yr.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New"">When we run an eQuest model of a hypothetical
2000ft2 building with no windows (to rule out solar gain
differences) and no heating system, only cooling, we find
that the EUI does increase with ACH at the two
locations—but there is almost no difference in how the
predicted EUI rises with ACH for the two cities with
wildly different VLI. The EUI rises by the same ~35
kBtu/sf/yr when going from 1ACH to 10ACH at both
locations.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><span
style="font-size:11.0pt;font-family:"Courier
New""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New"">Results summarized below for total building EUI
(kBtu/sf/yr):<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><span
style="font-size:11.0pt;font-family:"Courier
New""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New""> eQuest Simple
model using VLI<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New""> ACH New Orleans Tucson New
Orleans Tucson<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New""> 1 42 40
36 30<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New""> 10 76 74
126 74<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New"">------ -----------------------
-----------------------<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New""> 1->10 34 34
90 44<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><span
style="font-size:11.0pt;font-family:"Courier
New""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New"">(This windowless test building had R10 walls,
R20 roof, R5 floor – but all we are interested in is the *<b>difference</b>*
in total EUI associated with the increased ACH, which
shouldn’t depend on these choices).<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><span
style="font-size:11.0pt;font-family:"Courier
New""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Courier
New"">Z Smith, AIA, LEED AP BD+C | Director of
Sustainability & Building Performance |
Eskew+Dumez+Ripple | 365 Canal Street, Suite 3150 | New
Orleans, LA 70130 | 504.561.8686 | eskewdumezripple.com<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><span
style="font-size:11.0pt;font-family:"Courier
New""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><span
style="font-size:11.0pt;font-family:"Courier
New""><o:p></o:p></span></p>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Equest-users mailing list
<a class="moz-txt-link-freetext" href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a>
To unsubscribe from this mailing list send a blank message to <a class="moz-txt-link-abbreviated" href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a>
</pre>
</blockquote>
<br>
</body>
</html>