Hi,
Does anyone knows how to modeling double facedes in EnergyPlus? Like a
lightweight ceramic facede, located 10cm away from a traditional concrete
masonry wall. I figured if modeling an thin extra zone could be work, or if
its possible to work with the second facede only as a huge shading device. I
think the most important in these cases is the amount of natural convection
that occur around the exterior of the building but none of my proposals,
this fact is taken into account.
I appreciate if anyone can help me,
Sorry about my bad english.
Francisco Massucci
Hi Francisco.
If your facade is made up of only opaque construction and/or you want to
make a simple study of it, you can check the
SurfaceProperty:ExteriorNaturalVentedCavity. For more detailed
modelling, or if you facade is made of glassings, you should model the
facade as a independent zone, and use airflownetwork objects to setup
openings, virtual partitions and airflow.
Convection on the outside of the facade shouldn't be much of a problem,
the tricky one is the inside convection. EPlus doens't have an algorithm
specified for these kinds of building elements, so you'll have to choose
the one that best suits your needs.
Pedro.
Hi all,
Can anyone suggest the best tool to model double skin facades with glazing?
Kiran
Kiran,
I would say that you can select the best tool depending on your needs and the required output.
The mode of the DSF (natural/mechanical ventilation), the control systems, the position of shading within the ventilated cavity, the type of DSF (multi-story, box window, etc), the origin and destination of the air (DSF, airflow window), etc are some of the parameters that will define that.
In terms of tool validation of DSF there was an IEA validation task (34) (http://www.iea-shc.org/task34/subtask/index.html) that you can look into and see the comparative and empirical output.
I am using IDA ICE 4.0 (incorporates the ISO 15099) and E+ depending on my needs. I believe that in DSFs it is essential to have an insight on the tools physics and these 2 tools allow you that.
There are simpler tools depending on your needs such as Parasol (also using the ISO 15099) and WIS for steady state boundary conditions.
As to calculation methods you can download the literature review report from the IEA website: http://www.iea-shc.org/publications/downloads/Task34-Double_Skin_Facades_A_Literature_Review1.pdf
I hope this is of some use.
Best regards,
Harris Poirazis