[Bldg-sim] Natural Ventilation Control in Design Builder

[Paul Carey]

Holly,

 

If you use the scheduled mode you should be alright in doing roughly what
you want it to do using the scheduled air flow rates.

 

Essentially you need to set up the Nat Vent Set-Point Temperature on the
Activity tab and you'll see along with that you should have an option for
setting the Max In-Out Delta T.  This should allow you to set the model up
with your scheduled rates, but put a realistic setting in there which means
that natural ventilation will not occur if the Delta T is higher than say 5
deg C.  It means it won't bring in air that is too hot or too cold and will
only bring in as much as is possible with the Delta T that exists, etc.

 

Personally, I don't quite get why you don't just let the model calculate it
for you in calculated mode as I'd hope that way it should be more accurate
rather than trying to muddle together two separate calculations.
DesignBuilder can work out the stack/wind combined flow easily enough.

 

 Kind Regards

 

Paul

 

 

 

 


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Dr Paul Carey

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Director

Low Carbon Energy Assessor

 

Zero Energy Design Ltd

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Stalybridge

SK15 3AD

 


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From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of holly
wasilowski
Sent: 12 May 2010 20:39
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Natural Ventilation Control in Design Builder

 

Hi,

I am working with natural ventilation in DesignBuilder.  In another program
(CoolVent) I calculated varying ACH due to wind and stack effect.  I made a
schedule and input it into DesignBuilder. The problem is, I would like
DesignBuilder to both use my schedule of air changes AND close the windows
when it gets too cold outside.  However, it seems that I can either be in
Scheduled or Calculated mode.  Scheduled mode will use my ACH schedule, and
Calculated mode will close the windows when it's too cold.  It seems I can't
make DesignBuilder take both into account.  Am I missing something?  Thanks!

Holly

 

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