[TRNSYS-users] Reflective insulation in TRNSYS

[Xandrika]

Dear TRNSYS experts,

I am trying to represent radiant heat reflective insulation such as
alumimium foil for roofs (
http://supreme.co.in/protectivepack/insureflector-underdeck-insulation.html)
in TRNBUILD.
This kind of insulation has a low absorptance and low emittance and, thus,
reduces radiant heat transfer. It is combined with an airspace. My roof
layer are as followed (inside to outside):
Option 1:

   1. 1/2" flattened bamboo on rafters
   2. Radiative aluminium foil on 2" Styrofoam
   3. 2" air layer (ventilated)
   4. CGI roof on timber structure

Option 2:

   1. 1/2" flattened bamboo on rafters
   2. Radiative aluminium foil/sheet
   3. 2" air layer (ventilated)
   4. CGI roof on timber structure

However, I cannot put absorptance and emittance for each layer. So, I am
not sure how I can represent this material in TRNBUILD?
Could you, please, give me any advice? Thanks a lot.

Warm regards,
Susanne

__________________________________________________________
Susanne Bodach
PhD. Candidate
Technical University Munich
Institute of Energy Efficient and Sustainable Design and Building
<http://www.enpb.bgu.tum.de/en/home/>

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