Christophe, I would think that the correct method for simulating the atrium stratification would be to break the atrium up into multiple zones. You will then be faced with two problems. First is how to make sure that any solar energy can pass through the virtual zone boundaries. The other is to assess the air flow between the virtual zones. The first problem can be solved if you break the atrium up into only two zones because Type56 is able to define an internal window that can pass solar from one zone to another. I believe, however, that it cannot assess multiple internal windows in series. Thus if you broke the atrium up into 3 zones, the bottom zone would not get any solar. Someone please correct me if I am wrong about that!
The problem of air flow is best addressed by using one of the connections between TRNSYS and either COMIS or CONTAM. Those bulk air flow modeling tools will give you an estimate of the air flow between the virtual zones based on temperature and pressure differences between the zones. The COMIS connection is implemented either through TRNFlow or through Type157. The CONTAM connection is implemented through Type97. Kind regards, David At 11:21 10/5/2006, Enertech wrote: >Dear TRNSYS users > >Were working on a office building with passivhaus objectives : no air >conditioning plant and very low heating consumption (less than 15 >kWh/m²/year). This building has an atrium high 12 m. Ive got two problems: >- How to model the temperature stratification in the atrium? It is >a unique volume but we can assume that the temperature wont be the same in >all the volume. Should I describe this atrium as 2 or 3 zones and add a >coupling airflow between them? >- We want to use night free cooling to cool the offices during the >night in summer. It wont be transversal ventilation but each single office >will be ventilated by one unique window, that we assume wide opened >(dimensions 60 x 170 cm). Is there a type in TRNSYS that enable to model >natural ventilation? > >Thanks a lot for your help, > >Best regards, > >Christophe Plantier > > >=========================== >ENERTECH >F-26160 FELINES SUR RIMANDOULE >tel-fax : 04 75 90 18 54 >Email : [EMAIL PROTECTED] >Web : http://sidler.club.fr >================================ > > >_______________________________________________ >TRNSYS-users mailing list >TRNSYS-users@engr.wisc.edu >https://www.cae.wisc.edu/mailman/listinfo/trnsys-users **************************************************************************************** Thermal Energy System Specialists (TESS), LLC David BRADLEY 2916 Marketplace Drive - Suite 104 Partner Madison, WI 53719 Phone: (608) 274-2577 USA Fax: (608) 278-1475 E-mail: [EMAIL PROTECTED] Web Pages: http://www.tess-inc.com and http://www.trnsys.com "Providing software solutions for today's energy engineering projects" **************************************************************************************** _______________________________________________ TRNSYS-users mailing list TRNSYS-users@engr.wisc.edu https://www.cae.wisc.edu/mailman/listinfo/trnsys-users
