[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [TRNSYS-users] Atrium and natural ventilation
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
We?re 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. I?ve got two problems:
- How to model the temperature stratification in the atrium? It is
a unique volume but we can assume that the temperature won?t 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 won?t 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 : sidler@club-internet.fr
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: bradley@tess-inc.com
Web Pages: http://www.tess-inc.com and http://www.trnsys.com
"Providing software solutions for today's energy engineering projects"
****************************************************************************************