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[EnergyPlus_Support] Re: Night Ventilation
Thanks for the response.
Yes, 'night ventilation' is not specific.
What I want to model is using 'whole house fan' for residential applications. (this is what we manufacture: www.airscapefans.com)
This model does not have to be very complex. For the first pass I used the on-line generated basic building model, and then added 'ZoneVentilation: DesignFlowRate' with what I think are logical parameters. I control this ventilation on a seasonal schedule, and then also modified the heating setpoints seasonally to make sure that no summer heating is taking place.
My results are basically the same as the control house without night cooling.
Also, I do not see this extra night ventilation fan show up in the fan kw report - Any clues here as to where I might investigate ?
-Neil
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@...> wrote:
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> I did not suggest a full working example, because night venitlation is too general as a requirement.
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> Building with natural ventilation will be using AFN.
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> Building with HVAC will be using economizer control in the system with a night schedule.
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> Adaptive control need to integrate the control with the weather, i.e., difference in temperature and humidity between the outdoor and indoor conditions, and time, at night times only.
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> The UnitVentilator model has the economizer and OA controller, and was therefore the first to try by a beginner as a complete system.
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> When you have master the schedules and the controller and manager, then you can improve the complexity to match your night time requirements.
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> It is not simple, and there is no general answer.
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> If you just want to turn on some ventilation at night at a specific time, it is easy. Use a ventilation object and a schedule.
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> If you wanted it to be adaptive, it is not so simple. I know some research students are working on it, but I am not directly involved.
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> Dr. Li
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> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: neil@...
> Date: Wed, 11 Aug 2010 05:01:19 +0000
> Subject: [EnergyPlus_Support] Re: Night Ventilation
>
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> First of all, I'd like to know if Matt did find a solution.
>
> Next, could someone give a detailed response as to how to model night free cooling. There seem to be conflicting (half) methods around.
> - separate air handler?
> - ZoneAirflow: ZoneVentilationDesignRate ?
> - SystemAvailabilityManager: AvailabilityManager: NightVentilation?
>
> I tried #2 (seemed logical), but my results do not seem credible.
>
> I would appreciate if the instructions were somewhat more detailed than "try X".
>
> Thank You
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@> wrote:
> >
> >
> > Try the UnitVentilator model, using the minimum amount of cooling for the day time and the outdoor air ventilation as economizer.
> >
> >
> >
> > The outdoor temperature is monotored to control the amount of air flow into the OA mixer inlet node
> >
> >
> >
> > Dr. Li
> >
> >
> >
> >
> > To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> > From: liambrn@
> > Date: Mon, 19 Apr 2010 23:00:37 +0000
> > Subject: [EnergyPlus_Support] Re: Night Ventilation
> >
> >
> >
> >
> >
> > Matt,
> >
> > As a means to estimate effectiveness of nighttime ventilation, you could create a ZoneVentilation object that only comes on at the appropriate time (night, summer, etc.) using a schedule and when the outdoor temperature is within a certain range. The limitation to this is that you'll need to carefully choose the range of dates so that ventilation doesn't cause unecessary daytime heating.
> > Hope that helps...
> >
> > Liam O'Brien
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Matt Fung" <mfung@> wrote:
> > >
> > > Hello EnergyPlus Users,
> > >
> > >
> > >
> > > I was wondering if anyone had any tips or examples as to how to model
> > > night ventilation in a residential home. Any help would be greatly
> > > appreciated. Thanks.
> > >
> > >
> > >
> > > Matt Fung, P.E.
> > >
> > > Research Engineer
> > >
> > > <http://www.consol.ws/>
> > >
> > > 7407 Tam O'Shanter Drive
> > >
> > > Stockton, CA 95210-3370
> > >
> > > Phone: 209.473.5000 / Fax: 209.474.0817
> > >
> > > MFung@ <mailto:MFung@>
> > >
> > > www.ConSol.ws <http://www.consol.ws/>
> > >
> > >
> > >
> > > You can call me directly at 209.473.5002
> > >
> > >
> > >
> > > ConSol leads the Building Industry Research Alliance (BIRA) for the
> > > Department of Energy.
> > >
> > > To learn more about next generation homes and communities, visit
> > > www.BIRA.ws <http://www.bira.ws/>
> > >
> >
> >
> >
> >
> >
> > __________________________________________________________
> > Videos that have everyone talking! Now also in HD!
> > http://go.microsoft.com/?linkid=9724465
> >
>
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