reflective membrane

Alles zu DELPHIN, dem Programm zur hygrothermischen Bauteilsimulation.

Moderatoren: ghorwin, fechner, ruisinger

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crwc
Beiträge: 2
Registriert: 02 Jun 2021, 16:19

reflective membrane

Beitrag von crwc »

Hello,

Is it possible to create a reflective membrane (vapour barrier or under-roof screen) on Delphin?

If not, which material could be the closest to this reflective side?

Regards,

Claire
fechner
Beiträge: 75
Registriert: 19 Dez 2018, 09:32

Re: reflective membrane

Beitrag von fechner »

Hello,

You mean this membrane reflects longwave radiation?
If such a membrane is mounted on a side of a cavity it is possible to model it by using the longwave radiation exchange model (field condition). Maybe you can show me an example and I can show you how to handle it.
crwc
Beiträge: 2
Registriert: 02 Jun 2021, 16:19

Re: reflective membrane

Beitrag von crwc »

Hello,

Thank you for your reply.

Here is an exemple (in attachment) of the section I would like to model.

In this case, is it possible to model a aluminised roof sreen or vapor barrier ? Infrared radiation is then reflected.

Regards,

Claire
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fechner
Beiträge: 75
Registriert: 19 Dez 2018, 09:32

Re: reflective membrane

Beitrag von fechner »

Hello,

Yes, this is possible. You can use the field condition 'longwave radiation exchange in a cavity'. Here you can set the emission coefficients of both sides of the cavity. You only have to set a low value at the bottom side (with reflective membrane). Thats all.

Best regards
Heiko Fechner
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