[esp-r] Re: Forced Ventilation With Nodal Airflow Network

[Pueltz, Gunter]

Hi Ali,

the reason for the peak at 8pm might be caused by a slighlty defect
in ESP-r calculation of incident solar radiation:
If you look at the time row of solar radiation, you will find
short peaks early in the morning and in the evening - as far as
I know, these peaks are caused by small sun height angles, which are
rounded/estimated in a improper way - providing short, much too high
peaks in solar radiation .....

I hope this helps you a little bit ....

-Gunter

> -----Original Message-----
> From: esp-r-bounces at lists.strath.ac.uk
> [mailto:esp-r-bounces at lists.strath.ac.uk]On Behalf Of Ali fallahi
> Sent: Wednesday, March 21, 2007 5:31 AM
> To: esp-r at lists.strath.ac.uk
> Subject: [esp-r] Forced Ventilation With Nodal Airflow Network
> 
> 
> Hi,
> 
> I  am simulating the thermal behavior of a double skin facade. This
> double skin facade has been divided to 12 zones from the bottom to
> top. For nodal airflow network part (natural ventilation) I assigned
> one node to each zone and two nodes for ambient air ( totally 14
> nodes). When I connected the nodes by "Specific Airflow Opening "
> component I got a peak temperature of 40C at 3pm which is reasonable.
> However, while I try to have forced ventilation and use " Constant Air
> Flow rate" component I get a peak of 35C around 8pm which is not
> justifiable. Even if we say that temperature decrease is because
> higher airflow rate the delay in peak is strange ( 3pm to 8pm ??!!).
> The way I connected the nodes for forced ventilation was that first I
> connected the ambient node to first zone from the bottom by " Constant
> Air Flow rate" component and left the rest of nodes (12 nodes) with
> "Specific Airflow Opening " component. This way I considered a fan
> from the bottom zone which is blowing up to the upper zones. I am not
> sure about my configuration and my question is how I can have a forced
> ventilation in double skin facade or any vertical duct being divided
> to several zones in height. Which component do I need to use?
> 
> 
> Many Thanks,
> Ali Fallahi
> 
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