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John, you are correct. REHEAT-DELTA-T is set at the system level
and applies to all zones on that system. The ability to meet the
heating load will depend on the minimum flow during heating mode and the
reheat delta T. <br><br>
Note that PVAVS and VAVS do not necessarily deliver the minimum supply
air temperature specified. This may skew the relative
gas/electricity heating energy results one expects. <br><br>
<br>
At 01:03 PM 14/06/2012, John Aulbach wrote:<br>
<blockquote type=cite class=cite cite="">If I am not correct, you would
enter the reheat delta T at the SYSTEM level. Try that.<br><br>
John Aulbach<br>
Partner Energy<br><br>
<br>
<font size=2><b>From:</b> "Pasgar, Arash"
<APasgar@dbrinc.com><br>
<b>To:</b> "equest-users@lists.onebuilding.org"
<equest-users@lists.onebuilding.org> <br>
<b>Sent:</b> Tuesday, June 12, 2012 7:58 AM<br>
<b>Subject:</b> [Equest-users] VAV with electric heat coil<br>
</font><br>
Hi All,<br>
<br>
I am trying to model a package roof top VAV unit with electric heat
coil.<br>
<br>
At system level heating I selected:<br>
<br>
System type: Pkgd Var Val<br>
Heat source: furnace<br>
Zone heat source: Electric (each zone has a VAV with electric heat coil,
EAT=55, LAT=85)<br>
Heating capacity:-220 MBH (same as my mech sch. For RTVAV)<br>
<br>
At zone level I think I have to enter heating capacity or reheat delta T,
but both of them are n/a.<br>
How can I get this one fix?<br>
<br>
On my previous model, I modeled the electric heat coil as a baseboard in
each zone!!!<br>
I am not sure if I did it correctly because at the end my space heating
on baseline was very low compare to proposed and made energy saving
percent equal to -97%.<br>
<br>
Thanks in advance for your help<br>
<br>
<br>
<b>Arash Pasgar<br>
</b>Mechanical Designer<br><br>
<img src="cid:7.1.0.9.2.20120614145234.105f8ac8@enersave.ca.1" width=264 height=53 alt="Description: Description: Description: Description: Description">
<br><br>
v. 210.546.0200 | <a href="http://www.dbrinc.com">www.dbrinc.com</a><br>
<br><br>
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Christopher Jones, P.Eng.<br>
Suite 1801, 1 Yonge Street<br>
Toronto, ON M5E1W7<br>
Tel. 416-203-7465<br>
Fax. 416-946-1005<br>
email cj@enersave.ca<br>
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