[Equest-users] VAV with electric heat coil

[Chris Jones]

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.

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.


At 01:03 PM 14/06/2012, John Aulbach wrote:
>If I am not correct, you would enter the reheat delta T at the 
>SYSTEM level. Try that.
>
>John Aulbach
>Partner Energy
>
>
>From: "Pasgar, Arash" <APasgar at dbrinc.com>
>To: "equest-users at lists.onebuilding.org" <equest-users at lists.onebuilding.org>
>Sent: Tuesday, June 12, 2012 7:58 AM
>Subject: [Equest-users] VAV with electric heat coil
>
>Hi All,
>
>I am trying to model a package roof top VAV unit with electric heat coil.
>
>At system level heating I selected:
>
>System type: Pkgd Var Val
>Heat source: furnace
>Zone heat source: Electric (each zone has a VAV with electric heat 
>coil, EAT=55, LAT=85)
>Heating capacity:-220 MBH (same as my mech sch. For RTVAV)
>
>At zone level I think I have to enter heating capacity or reheat 
>delta T, but both of them are n/a.
>How can I get this one fix?
>
>On my previous model, I modeled the electric heat coil as a 
>baseboard in each zone!!!
>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%.
>
>Thanks in advance for your help
>
>
>Arash Pasgar
>Mechanical Designer
>
>Description: Description: Description: Description: Description
>
>
>v. 210.546.0200 | <http://www.dbrinc.com>www.dbrinc.com
>
>
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 >>
Christopher Jones, P.Eng.
Suite 1801, 1 Yonge Street
Toronto, ON M5E1W7
Tel. 416-203-7465
Fax. 416-946-1005
email cj at enersave.ca
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