<div class="gmail_quote"><div lang="EN-US" vlink="purple" link="blue"><div><p class="MsoNormal">Dear all:<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">In a baseline building modeling for LEED EApr2 documentation, I have some troubles with the simulation reports that shows unusually high amounts of severe errors (over 1000); when I try to model System Fan Power according G3.1.2.9. and procedure
proposed by James V Dirkes II, PE in a previous post (pro-rating fan power to supply/return fans per 90.1-2007?).<u></u><u></u></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I am concerned if we can be observed by LEED reviewer team about this severe warnings.<u></u><u></u></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Simulation details:<u></u><u></u></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">-Baseline model consist of six-levels building for typical office usage (8000m2 area approx.)</p><div>
<p class="MsoNormal">-HVAC system type 8, VAV with PFP zones according ASHRAE 90.1-2007 appendix G.<u></u><u></u></p>
<p class="MsoNormal">-Energyplus 6.0.0.023 software has been used.<u></u><u></u></p>
<p class="MsoNormal">-HVAC systems has been modeled with HVAC templates in this configuration:<u></u><u></u></p>
<p class="MsoNormal"> -Chilled Water loop with HVACTemplate:Plant:ChilledWaterLoop, Chiller and Cooling Tower<u></u><u></u></p>
<p class="MsoNormal"> -System-side equipment with HVACTemplate:System:VAV<u></u><u></u></p>
<p class="MsoNormal"> -Zone-side equipment with HVACTemplate:Zone:VAV:FanPowered<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">-System Fan Power modeling details:<u></u><u></u></p>
<p class="MsoNormal"> -Supply Fan Total Efficiency = 0.6 <u></u><u></u></p>
<p class="MsoNormal"> -Supply Fan Delta Pressure = 1495 Pa<u></u><u></u></p>
<p class="MsoNormal"> -Supply Fan Motor Efficiency = 0.9<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">-Severe errors details:<u></u><u></u></p>
</div><p class="MsoNormal"> -When Supply Fan Delta Pressure exceeds 500Pa, simulation error log exposes unusually high amounts of recurrent severe errors like that (over 1000 severe errors):</p><p class="MsoNormal">
<u></u><u></u> </p><p class="MsoNormal"><font face="courier new,monospace"><font color="#666666"> ** Severe ** FindRootSimpleController: Controller error for controller = SYSTEMVAV_DATACENTER COOLING COIL CONTROLLER<br>
** ~~~ ** Environment=SANTIAGO, at Simulation time=01/01 04:30 - 04:35<br>
** ~~~ ** Controller function is inconsistent with user specified controller action = Reverse action<br> ** ~~~ ** Actuator will be set to maximum action<br> ** ~~~ ** Controller control type=Temperature<br>
** ~~~ ** Controller temperature set point = 11.41 [C]<br> ** ~~~ ** Controller sensed temperature = 12.17 [C]<br> ** ~~~ ** Controller actuator mass flow rate set to 0.70 [kg/s]<br> ** ~~~ ** Controller actuator temperature = 12.20 [C]<br>
** ~~~ ** Note: Chilled water coils should be reverse action and the entering chilled<br> ** ~~~ ** water temperature (controller actuator temperature) should be below the setpoint temperature<br> ** ~~~ ** Note: Hot water coils should be normal action and the entering hot<br>
** ~~~ ** water temperature (controller actuator temperature) should be above the setpoint temperature<u></u><u></u></font></font></p><div><font color="#666666" face="courier new,monospace">
</font>
</div><p class="MsoNormal"> -Also I tried to reduce Supply Fan Total Efficiency and maintain Supply Fan Delta Pressure less than 500Pa but severe errors also occurred.<u></u><u></u></p><div>
</div><div> </div><p class="MsoNormal">Suggestions to reduce this errors or modeling system fan power in a different way? <u></u><u></u></p>
<p class="MsoNormal">Any comments will be appreciated....<u></u><u></u></p>
<p class="MsoNormal">Regards</p><p class="MsoNormal"> </p><p class="MsoNormal"> </p><p class="MsoNormal">Alvaro Urrutia Astorga</p><p class="MsoNormal">Arquitecto.</p><p class="MsoNormal"> </p><p class="MsoNormal"><u></u><u></u> </p>
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