Hi!
Phill, thanks for your clarification! It makes sense that it's only applicable to Part L2, since when you tick "Curtain wall" nothing happens.
DS40,
I understood what you mean. I see that a curtain wall is an opaque construction and there's no direct light transmitted.
In my case, I have an facade which is like a "box", so I have the opaque construction, then the cavity, and finally the glass. Because of this glass, I asked about the transmittance, reflectance, etc, because there is some radiation energy transmitted to the cavity. And I think, thermally, this is different from modeling only an opaque construction made of glass ("opaque") + cavity+ brick, etc...
I don't know if I was clear enought.
Thanks!
Curtain Wall
Re: Curtain Wall
Hi luanaepb,
I understand what you mean now I think. You are correct in that there will be heat transfer by radiation through the glass into the cavity and onto the solid surface within the fabric construction and hence potential heat gain in the room and so I see your concern. Unfortunately IES does not easily allow this to be modelled - see the responses to my original problem by Zap/ Kaspers.
It may be possible to model the cavity as a room such that the external wall is a window and then the internal wall would be the remainder of the opaque fabric construction?
If the building is still at the Design stage it would be worth asking the Architect/ specifier to consider a simple foil faced fabric layer to minimise the radiated heat issue and then you could ignore it in your model?
Sorry that I am unable to give a definitive solution but I am still learning here myself (!) A response from IES with suggested potential methods of overcoming your issue would be good.
Best of luck with this luanaepb
I understand what you mean now I think. You are correct in that there will be heat transfer by radiation through the glass into the cavity and onto the solid surface within the fabric construction and hence potential heat gain in the room and so I see your concern. Unfortunately IES does not easily allow this to be modelled - see the responses to my original problem by Zap/ Kaspers.
It may be possible to model the cavity as a room such that the external wall is a window and then the internal wall would be the remainder of the opaque fabric construction?
If the building is still at the Design stage it would be worth asking the Architect/ specifier to consider a simple foil faced fabric layer to minimise the radiated heat issue and then you could ignore it in your model?
Sorry that I am unable to give a definitive solution but I am still learning here myself (!) A response from IES with suggested potential methods of overcoming your issue would be good.
Best of luck with this luanaepb
Re: Curtain Wall
Hi DS40,
I've had already read your question before but I thought something had changed, due to the fact that now there is an option to tick "curtain wall".
I think, phisically, the best way to model the cavity is as a room, and assign the constructions as you described.
Actually, I've never perfomed a test in order to check the sensitivity of modelling with or without the cavity modeled as a room. Maybe one day I try... =)
Thanks anyway! It helped discussing a little bit! =)
I've had already read your question before but I thought something had changed, due to the fact that now there is an option to tick "curtain wall".
I think, phisically, the best way to model the cavity is as a room, and assign the constructions as you described.
Actually, I've never perfomed a test in order to check the sensitivity of modelling with or without the cavity modeled as a room. Maybe one day I try... =)
Thanks anyway! It helped discussing a little bit! =)
Re: Curtain Wall
One of the 2010 NCM constructions is for a curtain wall. I usually copy this and then edit it to suit my needs; it's a bit of a work-around for getting glazing into the opaque constructions.
Re: Curtain Wall
Hi JohnLloyd,
Well done for finding a solution.
I did a similar thing and used a construction I found in the 'education' construction fabric templates and that was how I determined that you can add glass if you use the plate glass in boards and sheeting category rather than in glazing category, (despite being advised that it was not possible to add glass to a wall at all.)
Well done for finding a solution.
I did a similar thing and used a construction I found in the 'education' construction fabric templates and that was how I determined that you can add glass if you use the plate glass in boards and sheeting category rather than in glazing category, (despite being advised that it was not possible to add glass to a wall at all.)