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You need to change your zone thermostat action from Proportional to
Reverse Action.<br>
<br>
On 1/16/2011 9:24 PM, Roselin Osser wrote:
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<p class="MsoNormal">Hi folks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m modeling a packaged VAV system (PVAVS)
serving only one zone. The maximum airflow the unit can
provide is 450,000 cfm, which I have entered in as an airflow
parameter. The problem is that whenever the system goes into
heating mode, the total cfm goes to minimum airflow (observed
from hourly output), even when more heating is needed, so I
end up with a lot of underheated hours. The minimum airflow
is calculated from the 10% outdoor air ratio I have entered.
I have tried adjusting the HMAX-FLOW-RATIO field to allow the
heating airflow to go above the minimum if necessary, but the
field seems to have no effect. I have a reverse action
thermostat in the zone. Anyone else run into this? There
must be some other parameter I’m using that is preventing the
field from working. Any advice would be appreciated, as I
have tried a lot of input variations and none of them allowed
the heating minimum flow to increase when more heat is
needed. I’m using eQuest 3.64.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks for your help!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Rosie<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family:
"Helvetica","sans-serif"; color: black;">Roselin
Osser, BEMP, LEED AP<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family:
"Helvetica","sans-serif"; color: black;">Building
Science Corporation<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family:
"Helvetica","sans-serif"; color: black;">30
Forest Street<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family:
"Helvetica","sans-serif"; color: black;">Somerville,
MA 02143<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family:
"Helvetica","sans-serif"; color: black;">978-589-5100
x 5284<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family:
"Helvetica","sans-serif"; color: black;">fax:
978-589-5103<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family:
"Helvetica","sans-serif"; color: black;"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family:
"Helvetica","sans-serif"; color: black;">Building
Science Corporation<br>
Somerville MA | Waterloo ON<br>
<a moz-do-not-send="true"
href="http://www.buildingscience.com/"><span style="color:
blue;">www.buildingscience.com</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family:
"Helvetica","sans-serif"; color: black;"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="avgcert" color="#000000" align="left">No virus found in
this message.<br>
Checked by AVG - <a moz-do-not-send="true"
href="http://www.avg.com">www.avg.com</a><br>
Version: 10.0.1191 / Virus Database: 1435/3384 - Release Date:
01/16/11</p>
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