Hi! Thanks for this quotation Damien but I don’t understand what is mean. It is mean that if I introduce some supply air (ventilation manager) in zone then TRNBuild assume that there is also exhaust air? Let us assume the situation: I have ventilator in zone A but there is no ventilator in zone B. Between zone A and B is wall with door. I calculated that air supply to zone A flows to zone B. This quotation say to me (in above situation): you should define ventilation for zone A (supply air) then TRNBuild assumes the same amount of exhaust air for this zone but without any destination. Then you define ventilation for zone B and parameters of air will be taken from zone A, TRNBuild again assume the same amount of exhaust air, without any destination. But if you define air from A to B as coupling flow then TRNBuild assume that the same amount of air leave zone B as coupling flow, not as exhaust air. 1) It is true??? If YES: 2) What does TRNBuild assume for infiltration? If during infiltration air is supplied to zone then how it is ejected form there? 3) If coupling flow is assumed then air “leave” part of its heat in wall? (because wall has some heat capacity) Thanks again Damien for you tip, but I am asking for more explanation! Regards Karol From: Damien Gondre [mailto:damien.gondre@insa-lyon.fr] Hi Karol, I have never used energy balances for zones so I don't know what Qvent, Qtrans or Qsolgain represent, but have you looked in the multizone building manual, section 5.4.1.11, page 156 : "Equal amounts of air are assumed to leave the airnode at the airnode temperature". I don't know if it helps or not, but I think it might change your vision of how the energy balance is defined. Regards, Damien. On Thu, Nov 17, 2011 at 1:28 PM, Karol Bandurski <karol.bandurski@put.poznan.pl> wrote: Hi, I has modeled two version of one family house: a. with mechanical ventilation b. with natural ventilation + exhaust fans in dirty rooms (bathroom, WC, Kitchen) Then I has define balance output Ntype 904 (Energy Balance for Zones) for one zone of this house. The balance is seems to me false because in TRNBuild in Ventilation Manager I can define only supply air ventilation. So, QVENT represents only heat from supply air, heat connect with exhaust air is probably contained in QTRANS. QTRANS has influence on temperature of walls, so maybe QSOLGAIN is also not so accurate? My question: It is true? How can I change it? Does TRNFlow change this imperfection? (I don’t have this soft, I has only Contam) Regards, Karol ------------------------------------------------ Karol Bandurski MSc. Institute of Environmental Engineering Poznan University of Technology
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