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RE: [EnergyPlus_Support] Night Purge
Dan:
Sorry. I forgot about that restriction. You are right,
infiltration, mixing, cross mixing, and ventilation are ignored when
the COMIS airflow option is active. Perhaps a unit ventilator with
appropriate control settings would accomplish your nighttime purge.
Mike
On 11 Feb 2003, at 8:28, Daniel Grunbaum wrote:
> Thanks Mike,
>
> Does the VENTILATION command work when the COMIS link is used. I
> thought you could either use the simple ventilation model or the COMIS
> link but not both. I get the following warning when attempting to use
> VENTILATION with the COMIS link.
>
> ** Warning ** The following lines are "Orphan Objects". These objects
> are in the idf
> ** ~~~ ** file but are never obtained by the simulation and
> therefore are NOT used.
> ** ~~~ ** See InputOutputReference document for more details.
> ************* Object=VENTILATION=11
>
> Is there a way I can use VENTILATION in combination with COMIS so that
> I can be naturally ventilating during the days and using a night purge
> at night when appropriate to do so ?
>
> Thanks
>
> Dan
>
> -----Original Message-----
> From: Michael J. Witte [mailto:mjwitte@xxxxxxxx]
> Sent: Tuesday, 11 February 2003 3:27 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: Re: [EnergyPlus_Support] Night Purge
>
>
> The VENTILATION command would be a good choice, because it gives you
> the option to ventilate until the zone cools down to the selected
> setpoint. You can also control the indoor-outdoor temperature
> difference at which the ventilation will operate.
>
> Regarding the interactions between COMIS and HVAC simualations. The
> two are fully interactive thermally, but they do not interact with
> pressure. In this application, and naturally-induced flows from the
> COMIS objects would continue to flow during operation of
> VENTILATION. Since the flow from the night purge system would likely
> be so much greater than any naturally-induced flows, I do not think
> this would cause a significant error.
>
> Sorry for the delayed response.
>
> Mike
>
>
> On 3 Feb 2003, at 10:21, Linda Lawrie wrote:
>
> > At 12:37 AM 2/3/2003, Daniel Grunbaum wrote:
> > >The
> > >night purge would involve some sort of mechanical ventilation
> system > >that would run throughout the night or when the
> temperature inside > >reaches a certain point and the exterior
> temperature drops to a > >certain point. Does anyone know the best
> way to model this using > >Energy Plus. > > A simplistic approach to
> this is to use the VENTILATION object in each > zone. > > I'm not
> sure if COMIS also might be able to do something like this >
> directly? > > > Linda > > EnergyPlus WebSite:
> http://www.energyplus.gov > Owner: EnergyPlus_Support list > Member:
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