[Equest-users] Window operation

[sinan senel]

Dear Peter and Pasha,
Thank you for the quick and the useful response. 
Actually, I want to see the effect of natural ventilation on overheating hours.

And the only that I can calculate overheating hours is to check whether zone 
temperatures are over a certain limit by using hourly reports.
Do you think it would be ok to use NV for this purpose?
And do I get it right that energy savings in fan energy consumption is due to 
the ourside air supllied to the zone by NV?
Thanks

Best Regards
Sinan Senel


________________________________
From: Pasha Korber-Gonzalez <pasha.pkconsulting at gmail.com>
To: Peter Hillermann <peterh at westallarchitects.com>
Cc: sinan senel <msinansenel at yahoo.com>; equest-users at lists.onebuilding.org
Sent: Wed, July 21, 2010 4:11:46 PM
Subject: Re: [Equest-users] Window operation


Yes, in addition to that you need to model/specify your building windows as 
"operable".  If they are specified as a "fixed" window then the simulation will 
not "open" them to the outside air conditions and subsequent wind speed from the 
weather file.
 
Always when trying to simulate some amount of NV you must have specified 
operable windows & window area separate from your fixed windows and window area 
AND you will have a temp schedule so that the program knows how you want it to 
react.  Also remember that these attempts to represent energy savings from 
operable windows or NV strategies are only static calculations, therefore there 
are no iterations to take advantage of the dynamic principals of NV in DOE-2.   
AND   this is not a good way to analyze thermal comfort of the occupants with NV 
design strategies.  The only purpose for applying this approach in DOE-2 is to 
minimally represent potential energy savings (mostly fan energy) in your whole 
building analysis.
 
Better tools (and typically more expensive tools) are available to properly 
analyze the dynamic characteristics of Natural Ventilation strategies & occupant 
thermal comfort, especially if you are trying to do this in support/compliance 
for the LEED credit.  One tool is TAS (thermal analysis software), and maybe 
TRNSYS (I'm not exactly sure of it's capability), and of course CFD.
 
pkg


On Wed, Jul 21, 2010 at 7:53 AM, Peter Hillermann <peterh at westallarchitects.com> 
wrote:

Sinan Senel,
> 
>Under HVAC systems there is an outside air tab with a natural ventilation tab. 
>Use it with a schedule attached to temperature and you should be fine. There is 
>even a textbox that says window probability open.
> 
>Thanks,
> 
>PETER HILLERMANN
> 
>peterh at westallarchitects.com
> 
>westall
>architects
>3404 pierce drive
>chamblee, georgia 30341
> 
>o 770.458.4113
>f  770.458.5352
>c 678.898.2936
> 
>westallarchitects.com
> 
> 
> 
>From:equest-users-bounces at lists.onebuilding.org 
>[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of sinan senel
>Sent: Wednesday, July 21, 2010 8:00 AM
>To: equest-users at lists.onebuilding.org
>Subject: [Equest-users] Window operation
> 
>Dear all,
>Does any of you know if we can model the exterior windows to be opened based on 
>the zone temperatures?
>For example I want to operate the exterior windows and open them if zone 
>temperature exceeds
>23 degrees and outdoor temperature is higher than 15 degrees. 
>Is it possible?
>
>Thank you in advance.
>
>Best Regards
>Sinan Senel
> 
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