<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<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;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-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;}
span.EmailStyle17
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.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]-->
</head>
<body lang="EN-US" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span style="color:#1F497D">Gerard and others,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I would say that typical actual operation of most parallel box systems and the intent of System 8 in App G is a hybrid of the two eQ control strategies that can’t be modeled in eQ. That would be Heating: Zone
Fans Only; Cooling: Cycle AHU fans. Has this bothered anyone else ever? Do other programs allow the user to model this normal operation?
<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">I suppose it’s debatable whether this specifically adheres to the G3.1.2.x Fan System Operation, which states “Supply and return fans… shall be cycled to meet heating and cooling loads during unoccupied hours.”
A strict interpretation of that would lead to the use of “Cycle on any” for “System 8” baselines also. “Cycle on any” is also what the Comnet Guidelines say quite specifically to use for all baseline cases. So much for what I think.
<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">As far as cooling, if the actual/proposed system stays off during unoccupied cooling as you imply by noting “</span>The proposed design is Zone Fans only<span style="color:#1F497D">”, what is the unoccupied zone
cooling tstat schedule value for the baseline to cycle on? I suppose you could grab the values from some default schedule.
<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">I think the T24 ACM rules make more sense for night cycle control in this case, that is baseline = proposed. “Zone Fans Only” for both cases.
<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">Clear as mud?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Fred<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="color:black">Fred Porter, BEMP, LEED</span></b><b><span style="color:#1F497D">©</span></b><b><span style="color:black"> AP<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-bottom:2.0pt"><span style="color:#7F7F7F">Senior Energy Analyst<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="color:#005DAA">Architectural Energy Corporation<o:p></o:p></span></b></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt;color:#005DAA">A Member of NORESCO Energy and Sustainability Services<o:p></o:p></span></i></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#7F7F7F">2540 Frontier Ave, Suite 100, Boulder, CO 80301<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#7F7F7F">Phone 303.459.7425 |
<a href="mailto:fporter@archenergy.com">fporter@archenergy.com</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#807F83"><a href="http://www.archenergy.com">www.archenergy.com</a></span><span style="font-size:9.0pt;color:#807F83"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;color:#7F7F7F"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<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>Gerard Hazel<br>
<b>Sent:</b> Wednesday, March 19, 2014 8:25 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Cc:</b> Greg Sydlowski<br>
<b>Subject:</b> [External] [Equest-users] Night Cycle Fan Control<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi All,<o:p></o:p></p>
<p class="MsoNormal">We have an issue with a model that we were hoping to get some feedback on from the eQuest community.<o:p></o:p></p>
<p class="MsoNormal">For ASHRAE HVAC System #8, how would you approach the night cycle fan control? ASHRAE 90.1 par. G3.1.2.4 doesn’t really cover this for System 8 and leaves it open to have the baseline as “Cycle on Any.” However with PFP boxes, you could
also argue it should be “Zone fans only” since they are part of System 8. There is no clear direction one way or the other in ASHRAE that we can find. Depending what you choose, it can be a major energy factor on the baseline. What’s the right answer?
The proposed design is Zone Fans only if that makes any difference.<o:p></o:p></p>
<p class="MsoNormal">Thanks in advance,<o:p></o:p></p>
<p class="MsoNormal">Gerry Hazel<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Gerard Hazel <o:p></o:p></p>
<p class="MsoNormal">M&E Engineers, Inc.<o:p></o:p></p>
<p class="MsoNormal">908-526-5700 x14<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</body>
</html>