[TRNSYS-users] Setting "front / back" coupling for interzonal airchange in type 56 - TRNFLOW interaction?

[Philip]

Dear David,

Thanks a lot for your helpful answer!
I got the airflow part right.

However, the front/back issue is not clear to me and I could not find an 
explanation in the documentation.
Please have a look at the following sketch:

  * is this the correct setting?






Sorry for the probably easy question, but at least for me it is not 
totally clear how to define it.

Thanks a lot!!

Philip



On 7/25/2014 9:38 PM, David BRADLEY wrote:
> Philip,
>   When you define a coupling air flow rate through an ADJACENT wall, a 
> quantity of air from the ADJACENT zone enters the active zone. In your 
> first picture below, 90 kg/h of air would enter zone AT_109 from 
> airnode R_107. If you click on the little green arrow button that 
> allows you to set whether the flow is constant, scheduled, or an 
> input, you will see a note explaining what the conditions of the air 
> entering the zone will be. If you want air to flow the other direction 
> as well (from AT_109 to R_107) you have to define that separately in 
> zone R_107.
>
>   The front/back switch has to do with the thermal model and which 
> surface of the wall is in a given zone.
> Kind regards,
>  David
>
>
>
> On 7/25/2014 08:05, Philip wrote:
>> Dear All,
>>
>> I could not find an explanation on the coupling "front/back", see below.
>>
>> I want to model an inter-zonal airchange between 2 zones (AT_009 and 
>> R_007- _green arrow in the screenshot_), so I have to define one zone 
>> as "*front*" and one as "*back*" and define the same coupling rate in 
>> both zones.
>>
>>   * But does it make any difference which is defined as front and
>>     which as back?
>>
>> There is also a *TRNFLOW *Network that connects some other zones 
>> (AT_009 and AT_109 etc. ..) in order to realize*night ventilation* 
>> through an Atrium.
>>
>> The zone *R_007 is not connected to the TRNFLOW network*, but I guess 
>> it would make sense to link it?
>>
>> Any help highly appreciated!!!
>>
>> Thanks, and have a nice weekend,
>> Philip
>>

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