<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:10pt">Mark:<br><br>Since you are using the as-designed HVAC system, you cannot increase the airflow and still be compliant with the design.<br><br>I have had some success in reducing unmet hours by increasing the thermostat throttling range as long as the increased range is consistent with the Owner's Project Requirements for space temperature limits. I also have had some success by choosing a different control zone in the Airside Systems Basic tab. This depends if you have more than one zone per system. Look at the SS-R Zone Performance Summary reports to see which zone(s) is giving you trouble.<br><br>If you have multiple zones per system and increasing the throttling range or changing the control zone does not work, try imputing the airflow on the Zone level instead of the System
level. If you input the supply CFM in the System tab, return that to default and divide up the design airflow in the zones. I would reduce the CFM in those zones that have 0 unmet hours and increase the CFM in those zones that have high unmet hours. The SS-R report will show how eQuest has allocated the supply CFM.<br><br>Paul Diglio<br><div style="font-family: times new roman,new york,times,serif; font-size: 10pt;"><br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><font face="Tahoma" size="2"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> John Aulbach <jra_sac@yahoo.com><br><b><span style="font-weight: bold;">To:</span></b> Mark Darrall <MDarrall@a2so4.com>; equest-users <equest-users@lists.onebuilding.org><br><b><span style="font-weight: bold;">Sent:</span></b> Mon, May 2, 2011 1:00:01 PM<br><b><span style="font-weight: bold;">Subject:</span></b> Re:
[Equest-users] Fixing unmet hours / outside of throttling range warnings<br></font><br>
<div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><div>Mark:</div>
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<div>Either spread your thermostat throttling range, or incrase your total supply airflow.</div>
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<b><span style="font-weight: bold;">From:</span></b> Mark Darrall <MDarrall@a2so4.com><br><b><span style="font-weight: bold;">To:</span></b> equest-users <equest-users@lists.onebuilding.org><br><b><span style="font-weight: bold;">Sent:</span></b> Mon, May 2, 2011 6:21:24 AM<br><b><span style="font-weight: bold;">Subject:</span></b> [Equest-users] Fixing unmet hours / outside of throttling range warnings<br></font><br>
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<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;">Good Morning, eQUESTers,</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> </span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;">I’m working on my design case model. Here’s my ATTN report:</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> </span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;">**WARNING**********************************************************************</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> SYSTEM EL1 Sys1 (PSZ) (G.NNW1) may have inadequate cooling capability</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> Check COOLING-CAPACITY and MIN-SUPPLY-T for consistency</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> </span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;">**WARNING**********************************************************************</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> SYSTEM EL1 Sys2 (PSZ) (G.WSW2) may have inadequate cooling capability</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> Check COOLING-CAPACITY and MIN-SUPPLY-T for consistency</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> </span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;">**WARNING**********************************************************************</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> SYSTEM EL1 Sys3 (PSZ) (G.N3) may have inadequate cooling capability</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> Check COOLING-CAPACITY and MIN-SUPPLY-T for consistency</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> </span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;">**WARNING**********************************************************************</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> SYSTEM EL1 Sys4 (PSZ) (G.S4) may have inadequate cooling capability</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> Check COOLING-CAPACITY and MIN-SUPPLY-T for consistency</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> </span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;">**WARNING**********************************************************************</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> SYSTEM EL1 Sys5 (PSZ) (G.N5) may have inadequate cooling capability</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> Check COOLING-CAPACITY and MIN-SUPPLY-T for consistency</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> </span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;">**WARNING**********************************************************************</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> SYSTEM EL1 Sys6 (PSZ) (G.E6) may have inadequate cooling capability</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> Check COOLING-CAPACITY and MIN-SUPPLY-T for consistency</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> </span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;">**WARNING**********************************************************************</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> SYSTEM EL1 Sys7 (PSZ) (G.C7) has zero outside air for design calculations</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> </span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> </span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;">This last one I can answer as this system is a R/A only computer room cooler. For the others:</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> </span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;">COOLING-CAPACITY comes directly from the HVAC designer and is the capacity of the installed units. I’ve tried adjusting MIN-SUPPLY-T from 55 to 50 (and this seems to jive with information the coil manufacturer provides) to get a larger delta-T and it only seemed to make things worse somehow. Minimum OSA is 20%, but again, this is a design condition. These units do have enthalpy-controlled economizers.</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> </span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;">I’m also getting WAY too many hours outside of throttling range – 15%. My baseline model only has a 3%. I’m way out of whack with Appendix G requirements.</span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;"> </span></p>
<p class="MsoNormal"><span style="font-family: 'Univers LT 55'; font-size: 9pt;">Any suggestions as to settings to modify to clear these? Thank you!</span></p>
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<p class="MsoNormal"><span style="font-family: 'Univers LT 45 Light'; color: rgb(51, 51, 51); font-size: 8pt;">MARK DARRALL, AIA, LEED AP BD+C, NCARB<br>Senior Project Manager</span></p>
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