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Re: [EnergyPlus_Support] control dampers
I think David is trying to model an older HVAC system that has constant
volume supply fans moving air to variable volume zone boxes. These
systems include a loop connection between the supply air and the return
air with a damper that operates to maintain a duct pressure set point
(Carrier is one manufacturer).
My experience with these systems is that they perform poorly. I would
not design a new system like this, but I might try to model an existing
system to evaluate the performance difference of a redesign. I do not
believe that E+ has sufficient control interfaces to build and model
this type of system. I think that a new equipment module would be
required to contain the calculation dynamics of this type of bypass
system.
Ned Lyon
Senior Project Manager
Simpson Gumpertz & Heger Inc.
41 Seyon Street
Building #1, Suite 500
Waltham, MA 02453
Phone: 781-907-9000
Fax: 781-907-9009
>>> mjwitte@xxxxxxxx 3/3/2004 1:57:37 PM >>>
I am not sure I understand exactly what your bypass will do. The dual
duct and
VAV dampers are controlled by the zone thermostat to meet the zone
setpoint.
The central heating coil in such a system is controlled by a setpoint
manager
to meet a specified leaving air temperature off the coil. See the
DDAutoSize.idf and 5ZoneAuto.idf example files.
Mike
On 1 Mar 2004, at 20:13, David Cormier wrote:
> hello,
>
> I have a second interrogation about the control of damper ... I model
a
> central heating coil with a constant fan ... I want to have a damper
in the zone
> and a big bypass that will take the flow that the damper will not
take ....
>
> May I use SINGLE DUCT:CONST VOLUME or SINGLE DUCT:VAV ?
>
> How the program proceed to choose if he open the damper or increase
the coil
> production ?? How we can control that choice ??
>
> (I look at the example files of vav ... I don't see damper
control...)
>
> thank you!
>
> david cormier
>
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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