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<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt; font-family:Arial; color:navy">Brian,</span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt; font-family:Arial; color:navy"> </span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt; font-family:Arial; color:navy">A few additional thoughts.</span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt; font-family:Arial; color:navy"> </span></font></p>
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<li class="MsoNormal" style="color:navy"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt; font-family:Arial">If you haven’t already, set NIGHT-CYCLE-CTRL = CYCLE-ON-ANY. If you don’t do this or schedule a warm up, you will likely have
unlet load hours in the morning. You can check this in the SS-O.</span></font> </li><li class="MsoNormal" style="color:navy"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt; font-family:Arial">I’ve found that perimeter zones are usually the most troublesome and have employed specifying cfm/ft2 at zone level in the past,
though I agree with others that 2cfm/ft2 seems high.</span></font> </li><li class="MsoNormal" style="color:navy"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt; font-family:Arial">Consider setting your Tstat control to REVERSE ACTION if you have low min flow ratio (i.e. < 0.4). This will allow the boxes
to open beyond MIN-DES-FLOW during heating.</span></font> </li><li class="MsoNormal" style="color:navy"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt; font-family:Arial">Don’t know anything about your project, but if this is a LEED ASHRAE90.1 baseline and you are modelling one system floor, take
a look at your peak loads by zone. If your problem zone loads differ by more than what is specified in Section G3.1.1 b. of the Performance Rating Method, you may be able to create a separate system. DOE2 has difficulty with systems where loads vary a lot
between zones. I doubt any energy model can handle this that well.</span></font>
</li></ol>
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<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt; font-family:Arial; color:navy">Good luck,</span></font></p>
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<b><font size="2" color="gray" face="Book Antiqua"><span lang="EN-GB" style="font-size:10.0pt; font-family:"Book Antiqua"; color:gray; font-weight:bold">Shuichi Hendrickson</span></font></b><font size="2" face="Arial"><span lang="EN-GB" style="font-size:10.0pt; font-family:Arial"></span></font></p>
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<font size="2" color="gray" face="Book Antiqua"><span lang="EN-GB" style="font-size:10.0pt; font-family:"Book Antiqua"; color:gray">Environmental Engineer, LEED AP</span></font><font size="2" face="Arial"><span lang="EN-GB" style="font-size:10.0pt; font-family:Arial"></span></font></p>
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<font size="2" color="black" face="Arial"><span lang="EN-GB" style="font-size:10.0pt; font-family:Arial"><br>
</span></font><b><font size="2" color="gray" face="Book Antiqua"><span lang="EN-GB" style="font-size:10.0pt; font-family:"Book Antiqua"; color:gray; font-weight:bold">ERM Japan</span></font></b><font size="2" face="Arial"><span lang="EN-GB" style="font-size:10.0pt; font-family:Arial"></span></font></p>
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<font size="2" color="gray" face="Book Antiqua"><span lang="EN-GB" style="font-size:10.0pt; font-family:"Book Antiqua"; color:gray">The Landmark Tower
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<font size="2" color="gray" face="Book Antiqua"><span lang="PT-BR" style="font-size:10.0pt; font-family:"Book Antiqua"; color:gray">Yokohama 19F</span></font><font size="2" face="Arial"><span lang="PT-BR" style="font-size:10.0pt; font-family:Arial"></span></font></p>
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<font size="2" color="gray" face="Book Antiqua"><span lang="DE" style="font-size:10.0pt; font-family:"Book Antiqua"; color:gray">2-2-1-1, Minatomirai, Nishi-ku</span></font><font color="black" face="ＭＳ Ｐゴシック"><span lang="PT-BR" style="font-family:"MS PGothic"; color:windowtext"></span></font></p>
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<font size="2" color="gray" face="Book Antiqua"><span lang="DE" style="font-size:10.0pt; font-family:"Book Antiqua"; color:gray">Yokohama, 220-8119, Japan</span></font><font size="2" face="Century"><span lang="PT-BR" style="font-size:10.5pt; font-family:Century"></span></font></p>
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<font size="2" color="black" face="Arial"><span lang="DE" style="font-size:10.0pt; font-family:Arial"><br>
</span></font><font size="2" color="gray" face="Book Antiqua"><span lang="DE" style="font-size:10.0pt; font-family:"Book Antiqua"; color:gray">T:+81(0)45-640-3780
<br>
F:+81(0)45-640-3781<br>
</span></font><font size="2" face="Arial"><span lang="EN-GB" style="font-size:10.0pt; font-family:Arial"><a href="mailto:shuichi.hendrickson@erm.com" title="mailto:shuichi.hendrickson@erm.com
mailto:first.lastnamemasashi.hishiyama@erm.com
mailto:first.lastname@erm.com"><span lang="DE">shuichi.hendrickson@erm.com</span></a></span></font><font size="2" face="Arial"><span lang="DE" style="font-size:10.0pt; font-family:Arial">
<br>
</span></font><font size="2" face="Arial"><span lang="EN-GB" style="font-size:10.0pt; font-family:Arial"><a href="http://www.erm.com/" title="http://www.erm.com/"><span lang="DE">www.erm.com</span></a>
</span></font><font size="2" face="Arial"><span lang="DE" style="font-size:10.0pt; font-family:Arial"></span></font></p>
<p class="MsoNormal" style="layout-grid-mode:char"><i><font size="2" color="gray" face="Book Antiqua"><span lang="EN-GB" style="font-size:10.0pt; font-family:"Book Antiqua"; color:gray; font-style:italic">Ranked No1 All-Environmental Firm: ENR Magazine (2004,
2005, 2006, 2007)<br>
Environmental Adviser of the Year: Acquisitions Monthly (2005, 2006, 2008)</span></font></i><i><font size="2" color="gray" face="Book Antiqua"><span lang="EN-GB" style="font-size:10.5pt; font-family:"Book Antiqua"; color:gray; font-style:italic"></span></font></i></p>
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<font size="1" color="teal" face="Webdings"><span lang="EN-US" style="font-size:8.0pt; font-family:Webdings; color:teal">P</span></font><font size="1" color="teal" face="ＭＳ ゴシック"><span lang="EN-US" style="font-size:8.0pt; font-family:"MS Gothic"; color:teal">
</span></font><font size="1" color="teal" face="Arial"><span lang="EN-US" style="font-size:8.0pt; font-family:Arial; color:teal">Please consider the environment before printing this email</span></font><font size="2" color="navy" face="Arial"><span lang="EN-US" style="font-size:10.0pt; font-family:Arial; color:navy"></span></font></p>
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<p class="MsoNormal"><b><font size="2" color="black" face="Tahoma"><span lang="EN-US" style="font-size:10.0pt; font-family:Tahoma; color:windowtext; font-weight:bold">From:</span></font></b><font size="2" color="black" face="Tahoma"><span lang="EN-US" style="font-size:10.0pt; font-family:Tahoma; color:windowtext">
joe@thespinnakergroupinc.com [mailto:joe@thespinnakergroupinc.com] <br>
<b><span style="font-weight:bold">Sent:</span></b> Sunday, April 10, 2011 4:22 AM<br>
<b><span style="font-weight:bold">To:</span></b> Bruce Easterbrook; Carol Gardner<br>
<b><span style="font-weight:bold">Cc:</span></b> equest-users@lists.onebuilding.org<br>
<b><span style="font-weight:bold">Subject:</span></b> Re: [Equest-users] Heat Pump Heating Undersized</span></font><font color="black"><span lang="EN-US" style="color:windowtext"></span></font></p>
</div>
<p class="MsoNormal"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt"> </span></font></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">"...as your time averaged outside air requirements also come into play and may not allow the VAV system to put enough flow into
a zone due to OA requirements of other zones."<br>
<br>
Very good point.<br>
<br>
<br>
Sent from myTouch 4G</span></font></p>
<div id="htc_header">
<p class="MsoNormal" style="margin-bottom:12.0pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">----- Reply message -----<br>
From: "Bruce Easterbrook" <bruce5@bellnet.ca><br>
To: "Carol Gardner" <cmg750@gmail.com><br>
Cc: "equest-users@lists.onebuilding.org" <equest-users@lists.onebuilding.org><br>
Subject: [Equest-users] Heat Pump Heating Undersized<br>
Date: Sat, Apr 9, 2011 10:46 am</span></font></p>
</div>
<p class="MsoNormal"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt"><br>
</span></font><font size="4"><span style="font-size:13.5pt">I agree with Carol and Joe. In almost all cases you shouldn't need to have the cfm/SF 400% higher than the eQuest set point. If you do, it is likely going to be a process load that causes this.
I have found the 0.5 cfm/SF eQuest default too low in most cases but leave it for my first run because what you really want are the heat/cool loads of the zones. Joe's tip,
</span></font><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt; font-family:Calibri; color:#1F497D">CFM*(Tsupply-Troom)*</span></font><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt; font-family:Calibri; color:#1F497D">(1.085)
</span></font>= <font size="4"><span style="font-size:13.5pt">BTU/h provides your tool. Your equipment provides the delta T of your air heating and cooling flows, the only variable is CFM. Use your loads required by the building to determine your CFM. The
old rule of thumb was around 1 CFM/SF but in most cases this is too generous. I think the reason eQuest uses a low default is to help you keep the fan energy to a minimum and maximize the efficiency of your system. You want just enough CFM to do the job,
more is a waste, too little gives lots of unmet load hours. This is where I start when tweaking a system. Your cooling flow normally sets the flow as it has the smallest delta T. Heat pumps have a lower heating delta T than a furnace. VAV further complicates
as your time averaged outside air requirements also come into play and may not allow the VAV system to put enough flow into a zone due to OA requirements of other zones. OA is also quite dominate when it comes to energy consumption. One other area to consider
it where your controlling zone is for your temperature control. Selecting the proper zone can have a large effect on unmet load hours.<br>
eQuest is a tool and will never give you the perfect system with the first press of the sim button. If you are just starting with eQuest consider yourself lucky if it even runs through. Your detailed reports give you the clues you need to refine your model.
Start with the coarse variables, CFM, delta T's, note I didn't mention throttling range. Allowing your system to run loose too early will hide problems in your design. A 2 degree throttling range is tight in my opinion but again eQuest is trying to help
with getting an efficient system. Look for errors in input, incorrect assumptions and numbers which don't seem right. Slow and plodding, one change at a time, check the effect and ALWAYS have a backup file.<br>
Bruce Easterbrook P.Eng.<br>
Abode Engineering<br>
</span></font><br>
On 08/04/2011 01:32 PM, Carol Gardner wrote: </p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">Brian,<br>
<br>
Hard to say without knowing more e.g. building type, internal loads, etc., but in general, although Paul may disagree, that's pretty high. I do not disagree with using that methodology, as long as the cfm/sf stays within reason.
<br>
<br>
If I were you I would start with looking at the internal loads, like w/sf for equipment and process, etc. If they can be raised or lowered reasonable, do so. The rule is, in general, that they be the same in both cases, so make sure you pick the changes up
in your other model. Also look at your temperatures entered in the zones/systems and associated schedules.<br>
<br>
Otherwise, you can always send the .pd2 and .inp files to us.<br>
<br>
Carol</span></font></p>
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<p class="MsoNormal"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">On Fri, Apr 8, 2011 at 10:00 AM, Brian Goldsmith <<a href="mailto:Brian.Goldsmith@atce.com">Brian.Goldsmith@atce.com</a>> wrote:</span></font></p>
<div>
<div>
<p class="MsoNormal" style=""><font size="2" color="navy" face="Arial"><span lang="EN-US" style="font-size:10.0pt; font-family:Arial; color:navy">So if I force the cfm/sqft to 2, it brings the unmet load hours down to about 80, which is good. But of course
the fan energy spikes. Each zone has its own unit. Is it good practice to force the cfm/sqft? Especially considering what this does to the fan energy?</span></font><span lang="EN-US"></span></p>
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<p class="MsoNormal" style=""><font size="2" color="navy" face="Arial"><span lang="EN-US" style="font-size:10.0pt; font-family:Arial; color:navy"> </span></font><span lang="EN-US"></span></p>
<div>
<p class="MsoNormal" style="margin-bottom:3.0pt"><b><i><font size="3" color="#333399" face="Times New
"><span lang="EN-US" style="font-size:12.0pt; font-family:"Times New\000D\000A"; color:#333399; letter-spacing:1.2pt; font-weight:bold; font-style:italic">Brian
Goldsmith</span></font></i></b><span lang="EN-US"></span></p>
<p class="MsoNormal" style=""><font size="1" color="green" face="Gill Sans MT"><span lang="EN-US" style="font-size:7.5pt; font-family:"Gill Sans MT"; color:green; letter-spacing:1.0pt"><a href="mailto:Brian.Goldsmith@atce.com" target="_blank" title="blocked::mailto:Brian.Goldsmith@atce.com">Brian.Goldsmith@atce.com</a></span></font><span lang="EN-US"></span></p>
<p class="MsoNormal" style=""><font size="1" color="green" face="Gill Sans MT"><span lang="EN-US" style="font-size:7.5pt; font-family:"Gill Sans MT"; color:green; letter-spacing:1.0pt">direct</span></font><font size="1" color="green" face="Gill Sans MT"><span lang="EN-US" style="font-size:7.5pt; font-family:"Gill Sans MT"; color:green">
<a href="tel:408.487.1217" target="_blank" value="+14084871217">408.487.1217</a></span></font><span lang="EN-US"></span></p>
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<p class="MsoNormal" style=""><b><font size="2" color="black" face="Tahoma"><span lang="EN-US" style="font-size:10.0pt; font-family:Tahoma; font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span lang="EN-US" style="font-size:10.0pt; font-family:Tahoma">
Joe Fleming [mailto:<a href="mailto:joe@thespinnakergroupinc.com" target="_blank">joe@thespinnakergroupinc.com</a>]
<br>
<b><span style="font-weight:bold">Sent:</span></b> Thursday, April 07, 2011 1:55 PM</span></font><span lang="EN-US"></span></p>
<div>
<div>
<p class="MsoNormal"><font size="2" color="black" face="Tahoma"><span lang="EN-US" style="font-size:10.0pt; font-family:Tahoma"><br>
<b><span style="font-weight:bold">To:</span></b> Brian Goldsmith; <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">
equest-users@lists.onebuilding.org</a><br>
<b><span style="font-weight:bold">Subject:</span></b> RE: [Equest-users] Heat Pump Heating Undersized</span></font><span lang="EN-US"></span></p>
</div>
</div>
</div>
<div>
<div>
<p class="MsoNormal" style=""><font size="3" color="black" face="Times New
"><span lang="EN-US" style="font-size:12.0pt; font-family:"Times New\000D\000A""> </span></font><span lang="EN-US"></span></p>
<p class="MsoNormal" style=""><font size="2" color="#1f497d" face="Calibri"><span lang="EN-US" style="font-size:11.0pt; font-family:Calibri; color:#1F497D">Check the minimum flow ratio and the minimum design flow cfm/sqft for the trouble zones. </span></font><span lang="EN-US"></span></p>
<p class="MsoNormal" style=""><font size="2" color="#1f497d" face="Calibri"><span lang="EN-US" style="font-size:11.0pt; font-family:Calibri; color:#1F497D">In the VAV system equest distributes a percentage of the supply airflow to each zone. But cfm/sqft is
a priority in the hierarchy and if you bump it up for the trouble <u>zones</u> you will get higher cooling and heating airflows at your given SAT. The energy you provide to the room is equal to CFM*(Tsupply-Troom)*</span></font><font size="2" color="#1f497d" face="Calibri"><span lang="EN-US" style="font-size:10.0pt; font-family:Calibri; color:#1F497D">(1.085
or another conversion factor depending on units and air density). </span></font><font size="2" color="#1f497d" face="Calibri"><span lang="EN-US" style="font-size:11.0pt; font-family:Calibri; color:#1F497D">So if your schedules and equipment are set up correctly
you should override the equest defaults for airflows or SAT.</span></font><span lang="EN-US"></span></p>
<p class="MsoNormal" style=""><font size="2" color="#1f497d" face="Calibri"><span lang="EN-US" style="font-size:11.0pt; font-family:Calibri; color:#1F497D"> </span></font><span lang="EN-US"></span></p>
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<p class="MsoNormal" style=""><font size="2" color="#52b230" face="Trebuchet MS"><span lang="EN-US" style="font-size:11.0pt; font-family:"Trebuchet MS"; color:#52B230"> </span></font><span lang="EN-US"></span></p>
<p class="MsoNormal" style=""><font size="2" color="#52b230" face="Trebuchet MS"><span lang="EN-US" style="font-size:10.0pt; font-family:"Trebuchet MS"; color:#52B230">Joe Fleming, E.I., LEED AP BD+C, BEMP</span></font><span lang="EN-US"></span></p>
<p class="MsoNormal" style=""><font size="2" color="#52b230" face="Trebuchet MS"><span lang="EN-US" style="font-size:10.0pt; font-family:"Trebuchet MS"; color:#52B230">Commissioning Agent</span></font><span lang="EN-US"></span></p>
<p class="MsoNormal" style=""><font size="2" color="#52b230" face="Trebuchet MS"><span lang="EN-US" style="font-size:10.0pt; font-family:"Trebuchet MS"; color:#52B230"><a href="tel:561-602-3132" target="_blank" value="+15616023132">561-602-3132</a></span></font><span lang="EN-US"></span></p>
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<p class="MsoNormal" style=""><font size="2" color="#52b230" face="Trebuchet MS"><span lang="EN-US" style="font-size:10.0pt; font-family:"Trebuchet MS"; color:#52B230">The Spinnaker Group</span></font><span lang="EN-US"></span></p>
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<p class="MsoNormal" style=""><b><font size="2" color="black" face="Tahoma"><span lang="EN-US" style="font-size:10.0pt; font-family:Tahoma; font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span lang="EN-US" style="font-size:10.0pt; font-family:Tahoma">
Brian Goldsmith [mailto:<a href="mailto:Brian.Goldsmith@atce.com" target="_blank">Brian.Goldsmith@atce.com</a>]
<br>
<b><span style="font-weight:bold">Sent:</span></b> Thursday, April 07, 2011 4:36 PM<br>
<b><span style="font-weight:bold">To:</span></b> Joe Fleming; <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">
equest-users@lists.onebuilding.org</a><br>
<b><span style="font-weight:bold">Subject:</span></b> RE: [Equest-users] Heat Pump Heating Undersized</span></font><span lang="EN-US"></span></p>
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<p class="MsoNormal" style=""><font size="3" color="black" face="Times New
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<p class="MsoNormal" style=""><font size="2" color="navy" face="Arial"><span lang="EN-US" style="font-size:10.0pt; font-family:Arial; color:navy">Ya I looked at all that, seemed to be fine. It seems like whenever I change my system from single zone package
to variable air volume this problem comes up. I just changed the system type and left everything else the same.</span></font><span lang="EN-US"></span></p>
<p class="MsoNormal" style=""><font size="2" color="navy" face="Arial"><span lang="EN-US" style="font-size:10.0pt; font-family:Arial; color:navy"> </span></font><span lang="EN-US"></span></p>
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<p class="MsoNormal" style="margin-bottom:3.0pt"><b><i><font size="3" color="#333399" face="Times New
"><span lang="EN-US" style="font-size:12.0pt; font-family:"Times New\000D\000A"; color:#333399; letter-spacing:1.2pt; font-weight:bold; font-style:italic">Brian
Goldsmith</span></font></i></b><span lang="EN-US"></span></p>
<p class="MsoNormal" style=""><font size="1" color="green" face="Gill Sans MT"><span lang="EN-US" style="font-size:7.5pt; font-family:"Gill Sans MT"; color:green; letter-spacing:1.0pt"><a href="mailto:Brian.Goldsmith@atce.com" target="_blank" title="blocked::mailto:Brian.Goldsmith@atce.com">Brian.Goldsmith@atce.com</a></span></font><span lang="EN-US"></span></p>
<p class="MsoNormal" style=""><font size="1" color="green" face="Gill Sans MT"><span lang="EN-US" style="font-size:7.5pt; font-family:"Gill Sans MT"; color:green; letter-spacing:1.0pt">direct
<a href="tel:408.487.1217" target="_blank" value="+14084871217">408.487.1217</a></span></font><span lang="EN-US"></span></p>
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<p class="MsoNormal" style=""><font size="2" color="navy" face="Arial"><span lang="EN-US" style="font-size:10.0pt; font-family:Arial; color:navy"> </span></font><span lang="EN-US"></span></p>
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<p class="MsoNormal" style=""><b><font size="2" color="black" face="Tahoma"><span lang="EN-US" style="font-size:10.0pt; font-family:Tahoma; font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span lang="EN-US" style="font-size:10.0pt; font-family:Tahoma">
Joe Fleming [mailto:<a href="mailto:joe@thespinnakergroupinc.com" target="_blank">joe@thespinnakergroupinc.com</a>]
<br>
<b><span style="font-weight:bold">Sent:</span></b> Thursday, April 07, 2011 12:14 PM<br>
<b><span style="font-weight:bold">To:</span></b> Brian Goldsmith; <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">
equest-users@lists.onebuilding.org</a><br>
<b><span style="font-weight:bold">Subject:</span></b> RE: [Equest-users] Heat Pump Heating Undersized</span></font><span lang="EN-US"></span></p>
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<p class="MsoNormal" style=""><font size="3" color="black" face="Times New
"><span lang="EN-US" style="font-size:12.0pt; font-family:"Times New\000D\000A""> </span></font><span lang="EN-US"></span></p>
<p class="MsoNormal" style=""><font size="2" color="#1f497d" face="Calibri"><span lang="EN-US" style="font-size:11.0pt; font-family:Calibri; color:#1F497D">Usually scheduling (fan, available heating and t-stat don’t coincide every hour of every day), airflow
(too low), SAT (too low), or multiple zones on one unit.</span></font><span lang="EN-US"></span></p>
<p class="MsoNormal" style=""><font size="2" color="#1f497d" face="Calibri"><span lang="EN-US" style="font-size:11.0pt; font-family:Calibri; color:#1F497D">Usually…</span></font><span lang="EN-US"></span></p>
<span style="color:rgb(82,178,48)">
<p class="MsoNormal" style=""><font size="2" color="#1f497d" face="Calibri"><span lang="EN-US" style="font-size:11.0pt; font-family:Calibri; color:#1F497D"> </span></font><span lang="EN-US"></span></p>
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<p class="MsoNormal" style=""><b><font size="2" color="black" face="Tahoma"><span lang="EN-US" style="font-size:10.0pt; font-family:Tahoma; font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span lang="EN-US" style="font-size:10.0pt; font-family:Tahoma">
<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>]
<b><span style="font-weight:bold">On Behalf Of </span></b>Brian Goldsmith<br>
<b><span style="font-weight:bold">Sent:</span></b> Thursday, April 07, 2011 2:24 PM<br>
<b><span style="font-weight:bold">To:</span></b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">
equest-users@lists.onebuilding.org</a><br>
<b><span style="font-weight:bold">Subject:</span></b> [Equest-users] Heat Pump Heating Undersized</span></font><span lang="EN-US"></span></p>
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<p class="MsoNormal" style=""><font size="3" color="black" face="Times New
"><span lang="EN-US" style="font-size:12.0pt; font-family:"Times New\000D\000A""> </span></font><span lang="EN-US"></span></p>
<p class="MsoNormal" style=""><font size="2" color="black" face="Arial"><span lang="EN-US" style="font-size:10.0pt; font-family:Arial">I’m having trouble with the heating in my heat pump. I modeled a Packaged VAV (PVAVS) with HEAT-SOURCE= Heat Pump and ZONE-HEAT-SOURCE=
Not Installed. Set HEAT-SET-T to 120F, DESIGN-HEAT-T to 70F, and did not specify auxiliary heat. I get the message that my zone has insufficient heating capability. Looking at SS-A, is says the maximum heating load is only -10.1 KBTU/HR. Looking at SS-P, the
report says my heating capacity is -47.8 KBTU/HR. So why do I have 563 underheated hours? Does it have something to do with the system type? I tried ZONE-HEAT-SOURCE= Heat pump and tried HEAT-SIZING-RATIO= 5, just to see if either one would do anything, although
I didn’t really expect them to. Also tried electric supplemental heat, which comes out to -31.715 KBTU/HR. My design supply flow is 1913 CFM, and the outside air flow is 252 CFM. The design supply flow is the same for both the heating and cooling performance
summaries. Should this be the case? Thanks for any help.</span></font><span lang="EN-US"></span></p>
<p class="MsoNormal" style=""><font size="2" color="black" face="Arial"><span lang="EN-US" style="font-size:10.0pt; font-family:Arial"> </span></font><span lang="EN-US"></span></p>
<p class="MsoNormal" style=""><b><i><font size="3" color="#333399" face="Times New Roman"><span style="color:rgb(51,51,153)"><span lang="EN-US" style="font-size:12.0pt; color:#333399; letter-spacing:1.2pt; font-weight:bold; font-style:italic">Brian Goldsmith,
LEED</span></span></font></i></b><b><sup><font size="2" color="#333399" face="Gill Sans MT"><span style="color:rgb(51,51,153)"><span lang="EN-US" style="font-size:10.0pt; font-family:"Gill Sans MT"; color:#333399; letter-spacing:1.2pt; font-weight:bold">®</span></span></font></sup></b><b><i><font color="#333399"><span lang="EN-US" style="color:#333399; letter-spacing:1.2pt; font-weight:bold; font-style:italic">
AP</span></font></i></b><span lang="EN-US"></span></p>
<p class="MsoNormal" style=""><font size="2" color="#333399" face="Times New Roman"><span lang="EN-US" style="font-size:11.0pt; color:#333399">Design Engineer</span></font><span lang="EN-US"></span></p>
<p class="MsoNormal" style=""><font size="1" color="green" face="Gill Sans MT"><span lang="EN-US" style="font-size:7.5pt; font-family:"Gill Sans MT"; color:green; letter-spacing:1.0pt"><img border="0" width="149" height="30" id="_x0000_i1027" src="%20"></span></font><span lang="EN-US"></span></p>
<p class="MsoNormal" style=""><font size="1" color="green" face="Gill Sans MT"><span lang="EN-US" style="font-size:7.5pt; font-family:"Gill Sans MT"; color:green; letter-spacing:1.0pt">97 E. Brokaw Road</span></font><font size="1" color="green" face="Gill Sans MT"><span lang="EN-US" style="font-size:7.5pt; font-family:"Gill Sans MT"; color:green">,
No 300</span></font><span lang="EN-US"></span></p>
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CA 95112</span></font><span lang="EN-US"></span></p>
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