[TRNSYS-users] air contact

[jeannieboef at gmail.com]

That being said, even with those programs, the modelling of airflow  
through large horizontal openings is "rough" at best. CFD may be a  
helpful tool to gain insights here.

Mit freundlichen Grüßen- Sent from my iPhone (excuse the brevity)

i. A.
Jean Marais
b.i.g. bechtold
Tel.   +49 30 6706662-23

On 14.02.2014, at 22:31, David BRADLEY <d.bradley at tess-inc.com> wrote:

> Karol,
>   What I have often done is to define a coupling air flow between  
> the two zones, then run the simulation once with very little  
> coupling flow and then once with a high airflow. The values of "low"  
> and "high" are somewhat arbitrary; the idea is to make a reasonable  
> guess as to how much air transfer there is. If there is no real  
> difference in the simulation outputs that I care about (such as  
> comfort or total building energy consumption) then I am confident  
> that I don't have to spend much time thinking about what a good  
> value would be (the model isn't sensitive to the value). If I find  
> that there is a high degree of sensitivity then I can focus some  
> more effort there.
>
>   At the other end of the spectrum, you can of course implement  
> COMIS, CONTAM, or TRNFlow in the building so as to get an estimate  
> of what the transfer might be.
> Kind regards,
>  David
>
>
> On 2/14/2014 12:26, Karol Bandurski wrote:
>> Dear Jochen,
>>
>> Thank you for your advice, but now I am looking for the values for  
>> such exchange, and the basis for this airflow assumption.
>> What is your practice with this issue?
>>
>> Regards,
>> Karol
>>
>> From: hotline [mailto:hotline at Transsolar.com]
>> Sent: Friday, February 14, 2014 4:48 PM
>> To: 'TRNSYS users mailing list at the Solar Energy Lab, UW-Madison'
>> Subject: Re: [TRNSYS-users] air contact
>>
>> Dear Karol,
>>
>> You can merge both zones to one zone and two airnodes. Please have  
>> a look into the manual 5.4.1 for the difference between airnode and  
>> zone.
>>
>> 1.       if you draw the building in SketchUp, you need to define  
>> the wall as a virtual surface, to merge them in TRNBuild ,use the  
>> 180° arrow on the upper left site of the zone window
>> 2.       If you define the wall manually in TRNBuild ,you can add  
>> directly another airnode to the zone.
>>
>> After merging you have two airnodes in the zone and you might need  
>> to define an air exchange see 5.2.4.10.
>>
>> Best
>>
>> __________________________________________________________________________________________________
 

>>
>> Jochen Lam
>> TRNSYS Software Team
>>
>> Transsolar Energietechnik GmbH
>> Curiestraße 2
>> 70563 Stuttgart
>> Fax:        +49 711 67976-11
>> Email:    jlam at transsolar.com
>> Web:      www.trnsys.de
>>
>> Von: trnsys-users-bounces at cae.wisc.edu [mailto:trnsys-users- 
>> bounces at cae.wisc.edu] Im Auftrag von Karol Bandurski
>> Gesendet: Freitag, 14. Februar 2014 15:24
>> An: trnsys-users at cae.wisc.edu
>> Betreff: [TRNSYS-users] air contact
>>
>> Dear All,
>>
>> I wondering how are you model air contact:
>>
>> there is two zones (e.g. two rooms) and they are connected by air  
>> (e.g. doorway), there are no mechanical ventilation or intensive,  
>> one direction, air flow.
>>
>> I think to assume some massless construction between this zones,  
>> but what resistance will be appropriate? Or maybe some both  
>> direction air flow, but how can I assume the value of the flow?
>>
>> Do you have some idea?
>>
>> Kind regards,
>> Karol
>>
>> ------------------------------------------------
>> Karol Bandurski MSc.
>> Institute of Environmental Engineering
>> Poznan University of Technology
>> www.put.poznan.pl/~karol.bandurski
>> www.ee.put.poznan.pl
>>
>>
>>
>> _______________________________________________
>> TRNSYS-users mailing list
>> TRNSYS-users at cae.wisc.edu
>> https://mailman.cae.wisc.edu/listinfo/trnsys-users
>
> -- 
> ***************************
> David BRADLEY
> Principal
> Thermal Energy Systems Specialists, LLC
> 22 North Carroll Street - suite 370
> Madison, WI  53703 USA
>
> P:+1.608.274.2577
> F:+1.608.278.1475
> d.bradley at tess-inc.com
>
> http://www.tess-inc.com
> http://www.trnsys.com
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