[EnergyPlus_Support] Re: Infrared Transparent Materials

["Jean marais" <jeannieboef@xxxxxxxxx>]

1) Air will not move through a gap, door, hole, window, crack or anything else unless you tell it to. This means that the simulation of air transport from A to B must be explicitly defined using one of the multitude of ventilation, mixing and Air Flow Network objects used for this purpose.
2) A zone air condition is by default "well mixed". Air stratification effect investigation require a non-default room air modelling object to be used. For the "chimney" flow due to temperature differences, or air density differences that are associated with an atrium, AFN is probably the way to go. There may be some normal niffty ventilation or mixing objects (like those that start mixing at a specified dT across the mixed zones) that could effect the same. You'll need to check all your options.
3) IRTransparent also comes with the downside that the radiation model is restricted to FullExteriorWithReflections. Here you have to be careful and think about what that implies. All zone penetrating radiation will fall on the floor only (which may be IRTransparent), not on the walls. The reflected part is then equally assigned to all the surfaces in the zone. Convection effects may need to be set using the specific object to do this (check io ref for IRTransparent).

There are many ways to model an Atrium, and not all atriums are the same.

Ask more questions as you get into it.

Regards,

Jean Marais

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "amalia" <amalia1706@...> wrote:
>
> Hello
> 
> I am new in modelling and I am about to model an Atrium. I wanted to ask it I use the Infrared Transparent surface, do I have to model for example for a 3-leves Atrium 3 Zones and set as Infrared Transparent surfaces their adjacent surfaces, or do I have to create only one Zone and divide it in a way? 
> 
> If I model it this way, by opening a window at the lower level, will the air move till the Zone at the upper level or will it be "trapped" at the lower level? 
> 
> Thank you alot for your help
> 
> Amalia
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Griffith, Brent" <brent.griffith@> wrote:
> >
> > Yes, they are intended for "connecting" interior zones where there actually is not really a surface separating the zones.  Open plan spaces are one application; another is stacking zones within a space in the vertical direction.  They do not transmit daylight.  I don't believe they are intended for surfaces exposed to the outdoors.
> > 
> > ________________________________
> > From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Clarice Bleil de Souza
> > Sent: Thursday, October 15, 2009 10:05 AM
> > To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> > Subject: Re: [EnergyPlus_Support] Infrared Transparent Materials
> > 
> > 
> > Hi Harris,
> > 
> > I am not an EPlus developer but I guess you could use it as an attribute of a 'void' or 'nil' surface. It is not difficult to have one of this type of surfaces if you deal with buildings with atrium or courtyards. As you cannot have one zone inside another you have to break open plan configurations somehow and that is when a 'void' surface would be needed.
> > 
> > Please guys from the development team correct me if I am mistaken but I saw a potential for this new feature to be used this way.
> > 
> > Clarice
> > 
> > 
> > 
> > --- Em qui, 15/10/09, harris.poirazis <harris.poirazis@> escreveu:
> > 
> > De: harris.poirazis <harris.poirazis@>
> > Assunto: [EnergyPlus_Support] Infrared Transparent Materials
> > Para: EnergyPlus_Support@xxxxxxxxxxxxxxx
> > Data: Quinta-feira, 15 de Outubro de 2009, 13:17
> > 
> > Hi all,
> > I am currently going through a part of the Input - Output Reference of Energy Plus.
> > In page 80 it states that an Infrared Transparent surface will actually participate in the transfer of visible and solar radiation by doing a wavelength transformation and making all short wave radiation that is incident on the surface into long wave length radiation and having it participate in the long wavelength radiant exchange.
> > I was wondering in what kind of cases we may use this application.
> > Thanks,
> > Harris
> > 
> > 
> > 
> > 
> > ________________________________
> > Veja quais são os assuntos do momento no Yahoo! + Buscados: Top 10<http://br.rd.yahoo.com/mail/taglines/mail/*http:/br.maisbuscados.yahoo.com/> - Celebridades<http://br.rd.yahoo.com/mail/taglines/mail/*http:/br.maisbuscados.yahoo.com/celebridades/> - Música<http://br.rd.yahoo.com/mail/taglines/mail/*http:/br.maisbuscados.yahoo.com/m%C3%BAsica/> - Esportes<http://br.rd.yahoo.com/mail/taglines/mail/*http:/br.maisbuscados.yahoo.com/esportes/>
> >
>




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