RE: [EnergyPlus_Support] Re: Mechanical night ventilation

[Lixing Gu <gu@xxxxxxxxxxxx>]

Juliana:

The AirflowNetwork model cannot work with ZoneInfiltration and
ZoneVentilation objects together. There are two types of fans allowed in the
AirflowNetwork model: Supply constant volume fan and Zone exhaust fans.
Please see an example file of AirflowNetwork_Multizone_SmallOfiice.idf.

Thanks.

Lixing 

-----Original Message-----
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Liam O'Brien
Sent: Monday, February 01, 2010 3:18 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Mechanical night ventilation

Hi Juliana,

Unfortunately I don't have enough experience with explicit airflow networks
to offer advice on this.  I think the error messages you're getting are
relative to the fact that you can't really mix detailed airflow and
simplified components.  So if you want some detailed objects, you'll likely
have to go all the way with that strategy.  Good luck.  

Liam

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "juobatista" <juobatista@...>
wrote:
>
> Hi Liam, thanks for your response!
> 
> I tried this solution, but it wasn't successful. It seems these objects
"zone ventilation" and "zone infiltration" cannot be simulated among air
flow network (see below the err reports): 
> 
> 1) First simulation:
> ** Warning ** GetAirflowNetworkInput: AirflowNetwork:SimulationControl
object, Specified AirflowNetwork Control = "MultizoneWithoutDistribution"
and ZoneVentilation objects are present.
>    **   ~~~   ** ..ZoneVentilation objects will not be simulated.
> 
> 2) Second simulation:
> ** Warning ** GetAirflowNetworkInput: AirflowNetwork:SimulationControl
object, Specified AirflowNetwork Control = "MultizoneWithDistribution" and
ZoneVentilation objects are present.
>    **   ~~~   ** ..ZoneVentilation objects will not be simulated.
> 
> That's the question: I need to simulate with air flow network, to obtain
results related to natural ventilation, considering windows opening and
variable wind direction. So, there is some way to simulate a fan operating
"inside" the air flow network option?
> 
> Thanks in advance,
> 
> Juliana
> 
> 
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Liam O'Brien" <liambrn@>
wrote:
> >
> > A simpler solution to an airflow network, would be to use
ZoneVentilation.  You can have the ventilation rate dependent on the indoor
and outdoor temperatures.  To restrict ventilation to 21:00 to 7:00 using a
compact schedule, but I believe you'll have to allow it upto: 7, not upto:
21, and upto: 24.  You can also predict fan energy using the ZoneVentilition
object.
> > 
> > Liam O'Brien
> > 
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "juobatista" <juobatista@>
wrote:
> > >
> > > Hi!
> > > 
> > > I simulated a model of a house with natural ventilation during day
hours, using airflow network in Energy Plus. But I need to combine natural
ventilation with mechanical night ventilation (9 P.M to 7 A.M). The system
consists in a simple intake fan, positioned in a hole on the wall, with
constant flow, operated by electricity. 
> > > 
> > > How can I do it? I tried zone infiltration (zone air flow) + a
apropriated schedule but it wasn't successful. 
> > > 
> > > Thanks!
> > > 
> > > Juliana
> > >
> >
>




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