RE: [EnergyPlus_Support] Re: Night Ventilation

[YuanLu Li <yli006@xxxxxxxxxxx>]

I did not suggest a full working example, because night venitlation is too general as a requirement.
 
Building with natural ventilation will be using AFN.
 
Building with HVAC will be using economizer control in the system with a night schedule.
 
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.
 
The UnitVentilator model has the economizer and OA controller, and was therefore the first to try by a beginner as a complete system.  
 
When you have master the schedules and the controller and manager, then you can improve the complexity to match your night time requirements.
 
It is not simple, and there is no general answer.
 
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.
 
 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.
 

 Dr. Li  

---

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: neil@xxxxxxxxxxxxxxxx
Date: Wed, 11 Aug 2010 05:01:19 +0000
Subject: [EnergyPlus_Support] Re: Night Ventilation

 

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.
> &

__._,_.___

Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.

Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___