[TRNSYS-users] Air flow balance in TRNBUILD

[David Bradley]

Vincent,
  I am not sure whether anyone responded to you about this but my 
understanding is that Type56 does not perform any air pressure 
checks. It assumes that whatever air you put into a zone, gets out of 
that zone. If you have a particular ventilation system setup in which 
you supply air to one zone and it returns from another then you need 
to specify a mass flow rate of air (equal to the mass flow rate that 
you supplied) that transfers from the supply zone to the return zone 
through an opening in an ADJACENT wall. TRNFlow, COMIS, or CONTAM 
(Type97) can be used to calculate such interzonal flow rates if they 
are not simple.

  The way we ususally "extract" air from a zone is to supply air to 
that zone through three Type56 inputs (T_VENT, RH_VENT, ACH_VENT). We 
then take the Type56 outputs for zone temperature and relative 
humidity and the outlet flow rate from the supply fan (which passes 
around Type56) for the return device.

Kind regards,
  David



At 08:06 5/24/2007, PARTENAY, Vincent wrote:
>Hello Trnsys users,
>
>I'm simulating a mutizone building in Trnbuild and I don't 
>understand how air coupling flows, ventilation and infiltration are 
>balanced (in order not to overload the building for example). How 
>can I extract air from the building ?
>
>Thanks in advance,
>
>Vincent Partenay
>
>
>
>
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